Compare commits

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291 Commits
Author SHA1 Message Date
Nuno CamposandGitHub 909a4591a8 Port checkpointer/store fixtures in langgraph-prebuilt to idiomatic pattern (#4629) 2025-05-09 19:42:44 +00:00
Nuno CamposandGitHub fc1ef29df7 Extend all tests using InMemorySaver to use all available checkpointers (#4627) 2025-05-09 12:34:59 -07:00
Nuno CamposandGitHub 30a72ced06 Implement update_state for functional api (#4626) 2025-05-09 12:34:45 -07:00
Nuno CamposandGitHub 302ae69e60 More idiomatic sync/async checkpointer fixtures in pytest (#4624) 2025-05-09 12:34:34 -07:00
Nuno CamposandGitHub 6777b5274c More idiomatic sync/async store fixtures in pytest (#4617)
- Use a single fixture that returns the store, instead of list of names
2025-05-09 12:34:16 -07:00
Nuno CamposandGitHub c5283cac09 Cache nodes/tasks (#4486)
- BaseCache interface defines the base class for cache storage adapters
- FileCache implements BaseCache with filesystem-backed storage
- Provide default cache key implementation which hashes args with pickle
- Update PregelExecutableTask with cache_key property for tasks that
opt-in to caching
- Update PregelLoop, PregelRunner to get/set from cache as appropriate

TODO
- [x]  Call match_cached_writes in async PregelRunner
- [ ]  Implement RedisCache to use in LGP
- [x]  Add more tests
2025-05-09 12:34:04 -07:00
Nuno Campos 562d64bbb7 Lint 2025-05-09 12:07:59 -07:00
Nuno Campos 898f266f72 Overload clear method to delete all when called without args 2025-05-09 12:05:26 -07:00
Nuno Campos 331d5b07ce Limit depth 2025-05-09 12:00:08 -07:00
William FHandGitHub 62069439fc feat: support --base-image in langgraph dockerfile command (#4628) 2025-05-09 18:35:33 +00:00
Nuno Campos 0d9b664360 Extend all tests using InMemorySaver to use all available checkpointers 2025-05-09 11:11:04 -07:00
Nuno Campos e8cea06e7e Implement update_state for functional api 2025-05-09 10:54:26 -07:00
Nuno Campos ed7f038a19 Fix 2025-05-09 10:54:12 -07:00
William FHandGitHub e507f0b991 feat: Customize timeouts in get_client (#4622) 2025-05-09 10:07:35 -07:00
Nuno Campos af961e279b More idiomatic sync/async checkpointer fixtures in pytest 2025-05-09 09:59:43 -07:00
Nuno Campos dd55e5097b Move to sep file 2025-05-09 09:01:25 -07:00
Nuno Campos 92cc3f0e0e More idiomatic sync/async store fixtures in pytest
- Use a single fixture that returns the store, instead of list of names
2025-05-09 08:38:31 -07:00
Eugene YurtsevandGitHub 4210188ade docs: remove giscus comments (#4616) 2025-05-09 11:22:43 -04:00
Nuno Campos 6fc1df9013 Lint 2025-05-08 17:12:22 -07:00
Nuno Campos 7850c8d799 Lint 2025-05-08 17:08:47 -07:00
Nuno Campos 83d2f93566 Lint 2025-05-08 16:57:21 -07:00
Nuno Campos c937d5f048 Lint 2025-05-08 16:54:06 -07:00
Nuno Campos 1a6395fd07 Move FileCache to sqlite package, add InMemoryCache 2025-05-08 16:50:36 -07:00
Nuno Campos 6e0041529e Add clear cache methods 2025-05-08 16:50:24 -07:00
Nuno Campos d5d6fc0fee Remove refresh 2025-05-08 16:50:24 -07:00
Nuno Campos 31b135f75d Add namespace to cache keys 2025-05-08 16:50:24 -07:00
Nuno Campos bebb0e8164 Lint 2025-05-08 16:50:24 -07:00
Nuno Campos 4761eb7696 Lint 2025-05-08 16:50:24 -07:00
Nuno Campos f1c1eaf229 Lint 2025-05-08 16:50:24 -07:00
Nuno Campos 0211886bf5 Lint 2025-05-08 16:50:24 -07:00
Nuno Campos 0dd9fba0af Lint 2025-05-08 16:50:24 -07:00
Nuno Campos f5bf77b3eb Lint 2025-05-08 16:50:09 -07:00
Nuno Campos 7c9f9aa89d Lint 2025-05-08 16:49:38 -07:00
Nuno Campos d38303494c Lint 2025-05-08 16:49:38 -07:00
Nuno Campos c4deb2c621 Finish implementation, add tests 2025-05-08 16:49:38 -07:00
Nuno Campos 42d88a769a Lint 2025-05-08 16:49:38 -07:00
Nuno Campos 14b07d06fa Re-implement using sqlite 2025-05-08 16:49:38 -07:00
Nuno Campos d04570f178 Lint 2025-05-08 16:49:38 -07:00
Nuno Campos 6c155f87c3 Lint 2025-05-08 16:49:38 -07:00
Nuno Campos 0264363083 Lint 2025-05-08 16:49:38 -07:00
Nuno Campos 1edf5cee89 Accept default cache_policy for graph/entrypoint/pregel 2025-05-08 16:49:38 -07:00
Nuno Campos 0e81699fec Lint 2025-05-08 16:49:01 -07:00
Nuno Campos a2a1a42c75 Fix 2025-05-08 16:49:01 -07:00
Nuno Campos 6b78bcd857 Implement ttl in FileCache 2025-05-08 16:49:01 -07:00
Nuno Campos d33c5a20e4 Fix 2025-05-08 16:49:01 -07:00
Nuno Campos 09fdc14d0a Output cached writes 2025-05-08 16:49:01 -07:00
Nuno Campos 64491a2b29 Lint 2025-05-08 16:49:01 -07:00
Nuno Campos 057da43cd0 Lint 2025-05-08 16:49:01 -07:00
Nuno Campos a11a62e68f Thread-safe delete 2025-05-08 16:49:01 -07:00
Nuno Campos 1d977f1c09 Rename 2025-05-08 16:49:01 -07:00
Nuno Campos 5cff35d1c3 Fix type annotation 2025-05-08 16:49:01 -07:00
Nuno Campos ed3f05260a Secure! 2025-05-08 16:49:01 -07:00
Nuno Campos b3ea406e81 Add pickle_fallback for json plus serializer 2025-05-08 16:49:01 -07:00
Nuno Campos 2a1c63ff9c Fixes 2025-05-08 16:49:01 -07:00
Nuno Campos 1aecde3cd8 Re-do with separate cache interface 2025-05-08 16:49:01 -07:00
Nuno Campos a446f34ed9 WIP 2025-05-08 16:48:46 -07:00
Nuno CamposandGitHub c2776449fd Deferred Node (#4269) 2025-05-08 23:03:57 +00:00
William FHandGitHub 88fd6b1e80 Start dev server externally (#4604)
Signed-off-by: William Fu-Hinthorn <13333726+hinthornw@users.noreply.github.com>
2025-05-08 15:20:51 -07:00
William FHandGitHub 10b1676d0b Update python SDK docstrings (#4602) 2025-05-08 14:37:26 -07:00
William FHandGitHub c1bf678ed1 Update openapi spec (#4599)
Incorporate new arguments added to the API, including the `/mcp` paths
2025-05-08 09:14:18 -07:00
William FHandGitHub 9938b51d31 release: 0.4.3 (#4592) 2025-05-07 20:28:40 -07:00
b84ae660b8 langgraph: use tuples for streamed message events in RemoteGraph (#4589)
Co-authored-by: William FH <13333726+hinthornw@users.noreply.github.com>
2025-05-08 03:20:23 +00:00
William FHandGitHub e3146d8050 Fix remote streaming of subgraphs (#4590)
Because we were propagating the task ID config key, the stream mode was
always overridden as "values", meaning the token, etc. callback handlers
were never added within the remote graphs.

---------

Signed-off-by: William Fu-Hinthorn <13333726+hinthornw@users.noreply.github.com>
2025-05-07 20:10:31 -07:00
Lauren Hirata SinghandGitHub d56c3b0f26 Update banner (#4588) 2025-05-07 20:12:35 -04:00
Lauren Hirata Singh cf89499507 Update banner 2025-05-07 20:07:31 -04:00
Vadym BardaandGitHub 79dffe20b2 docs: update multi agent multi-turn howto (#4582)
Fixes #4554
2025-05-07 16:06:28 -04:00
a9ea0cd28a Add a limit to Pregel.draw (#4575)
Co-authored-by: vbarda <vadym@langchain.dev>
2025-05-07 16:12:12 +00:00
GustafandGitHub ffaddab110 docs: Fixed incorrect tool in 'Write from tools' documentation (#4572)
I was having trouble following this section of the docs and I realized
it is because the incorrect tools is included in the tools list.
`update_user_info` was defined earlier in the file but never used.
2025-05-07 11:06:44 -04:00
William FHandGitHub 4aeaffef4e 0.4.2 (#4570)
Release
2025-05-06 18:28:37 -07:00
Lauren Hirata SinghandGitHub b44be763fb Fix typos (#4567) 2025-05-06 13:41:32 -07:00
langchain-infraandGitHub 00d2a1abd4 docs: update ingress requirement for self hosted control plane (#4564) 2025-05-06 14:51:37 -04:00
infra 2e8e9e4531 docs: update ingress requirement for self hosted control plane 2025-05-06 11:46:31 -07:00
William FHandGitHub 0e2471b401 Add LANGGRAPH_POSTGRES_POOL_MAX_SIZE env var (#4562) 2025-05-06 18:23:55 +00:00
Nuno CamposandGitHub e401ad7c75 langgraph: decouple name from assistant ID in RemoteGraph (#4550) 2025-05-05 18:22:54 -07:00
vbarda f1bfd6051a update 2025-05-05 21:02:10 -04:00
vbarda 998be75f34 langgraph: decouple name from assistant ID in RemoteGraph 2025-05-05 20:47:22 -04:00
Nuno CamposandGitHub e51442279a sdk-py: Prefix private functions in sdk with _ (#4542) 2025-05-05 15:19:24 -07:00
Nuno Campos 365dd5f459 sdk-py: Prefix private functions in sdk with _ 2025-05-05 14:43:34 -07:00
Jacob LeeandGitHub 8837f8452c docs: Fix JS example in custom auth how-tos (#4536)
Should be `defaultHeaders`:
https://github.com/langchain-ai/langgraph/blob/main/libs/sdk-js/src/client.ts#L76
2025-05-05 12:35:00 -07:00
Vadym BardaandGitHub 306915690c docs(concepts): update HITL Command section (#4533) 2025-05-05 18:44:32 +00:00
Vadym BardaandGitHub 0e61cc2cf6 prebuilt: remove state_modifier (#4439)
Removes support for `state_modifier` param in `create_react_agent`. To
specify system prompt / instructions use `prompt` parameter.
2025-05-05 09:49:28 -04:00
Sydney RunkleandGitHub a0a302dec5 prebuilt: switch to executing parallel tool calls via Send by default (#4438) 2025-05-05 09:49:09 -04:00
Vadym BardaandGitHub b19405b296 docs: hide old RAG tutorials (#4525) 2025-05-04 21:03:05 +00:00
Vadym BardaandGitHub 101ad12292 docs: update agentic rag tutorial (#4513) 2025-05-04 20:59:08 +00:00
Vadym BardaandGitHub df58a71567 docs: update api ref test (#4516) 2025-05-02 13:58:29 -04:00
Vadym BardaandGitHub ee04c32bb3 docs: update api ref links to be smaller / italicized (#4514) 2025-05-02 12:50:21 -04:00
William FHandGitHub 4e05db8537 Release checkpoint-sqlite (#4509) 2025-05-01 22:42:07 -07:00
William FHandGitHub d6e20e6d09 Add missing 'running' RunStatus (#4508) 2025-05-02 05:36:58 +00:00
Eugene YurtsevandGitHub dd4ad48864 docs: add /mcp endpoint concept for LangGraph Server (#4151)
Documents the /mcp endpoint for LangGraph Server
2025-05-01 22:14:22 -04:00
Vadym BardaandGitHub f79c8487d9 docs: remove nonexistent pages from nav (#4504) 2025-05-01 21:34:24 -04:00
Vadym BardaandGitHub 284e9a2cb4 docs: hide hierarchical tutorial from nav (#4503) 2025-05-01 21:24:12 -04:00
Vadym BardaandGitHub 9216e949e9 docs: update multi-agent supervisor tutorial to use handoffs (#4491) 2025-05-01 21:22:14 -04:00
gyudozaandGitHub a6e2d9e197 docs(rag): fix many typo of generate at RAG section (#4490)
While I was studying about RAG by using langgraph, I found these typos.
2025-05-02 01:19:24 +00:00
Eugene YurtsevandGitHub abae398a3a fix(docs): fix indent typo in code snippet in human-in-the-loop.md (#4501) 2025-05-01 21:18:15 -04:00
William FHandGitHub fcd06acd33 Add support for specifying a custom base image in docker commands (#4500)
build & dockerfile commands

can be specified via CLI  > langgraph.json
2025-05-01 23:13:49 +00:00
c687daa867 docs: update sql tutorial (#4494)
Co-authored-by: Lauren Hirata Singh <lauren@langchain.dev>
2025-05-01 20:18:00 +00:00
Sydney RunkleandGitHub a9f02efab2 docs: remove type in parens from docstrings + use tables for args (#4497)
Adhering to google style format so that mkdocs can pick up + format
args. Also, these types easily get out of date, so nice to remove from
that perspective as well.

Before:

<img width="710" alt="Screenshot 2025-05-01 at 2 01 55 PM"
src="https://github.com/user-attachments/assets/9ad0b33e-5d2c-43c2-9e7c-bf3fc6a6dffe"
/>

After:

<img width="729" alt="Screenshot 2025-05-01 at 2 01 24 PM"
src="https://github.com/user-attachments/assets/97e94d54-41f0-4946-9677-0c5d6400d62b"
/>
2025-05-01 14:08:52 -04:00
Sydney Runkle 2288ef110c use table format 2025-05-01 14:01:14 -04:00
Sydney Runkle ceac510054 meaningless change to docs/ to get vercel going 2025-05-01 13:52:33 -04:00
Sydney Runkle 94994a8d99 meaningless commit to get vercel going sigh 2025-05-01 13:50:55 -04:00
Sydney Runkle f35caf3401 fix for langgraph 2025-05-01 13:41:18 -04:00
Sydney Runkle 3cf2291354 docstrings for prebuilt 2025-05-01 13:40:58 -04:00
Sydney Runkle 0f96441a7c docstrings for sdk-py 2025-05-01 13:40:39 -04:00
Sydney Runkle 6c6bfbc63a docstrings for checkpoint-sqlite 2025-05-01 13:40:21 -04:00
Sydney Runkle 8ce33b948c docstrings for checkpoint-postgres 2025-05-01 13:40:05 -04:00
Sydney Runkle cc698b4f2b docstrings for checkpoint 2025-05-01 13:29:51 -04:00
Sydney Runkle 5916dc333e docstring fixes for cli 2025-05-01 13:23:54 -04:00
Sydney Runkle 7b749f05bd docstring fixes for libs/langgraph 2025-05-01 13:22:49 -04:00
Vadym BardaandGitHub cc4d2d26c7 docs: update add_messages API ref (#4495) 2025-05-01 12:33:27 -04:00
Vadym BardaandGitHub 3c7861c70a docs: fix a link in the agents page (#4492) 2025-05-01 11:39:37 -04:00
William FHandGitHub a2035eeb11 Update CLI (#4488)
Remove maxbound for langgraph-api and runtime inmem.

Update min-bound.

Add server log level flag for dev
2025-04-30 18:23:41 -07:00
William FHandGitHub 9a5b602287 Add checkpoint_during for the SDKs (#4487) 2025-04-30 15:56:29 -07:00
lc-arjunandGitHub 03c34bf2cf feat: assistants sorting sdk spec (#4484) 2025-04-30 17:05:37 -04:00
Vadym BardaandGitHub 536c1c2bba docs: remove prebuilt how-tos and add redirects to agents tab (#4485) 2025-04-30 15:55:55 -04:00
c5de8f4e50 docs(agents): update manage message history section (#4482)
Co-authored-by: Lauren Hirata Singh <lauren@langchain.dev>
2025-04-30 19:11:45 +00:00
Vadym BardaandGitHub d08ed5f42e docs(agents): add store semantic search link (#4483) 2025-04-30 15:08:18 -04:00
David DuongandGitHub 0269dd8818 release(langgraph): 0.4.1 (#4480) 2025-04-30 20:24:48 +02:00
David DuongandGitHub aa722ac084 release(sdk-js): 0.0.72 (#4481) 2025-04-30 20:22:01 +02:00
Tat Dat Duong 91e9f12b54 release(sdk-js): 0.0.72 2025-04-30 20:19:30 +02:00
Tat Dat Duong 5779d9079f release(langgraph): 0.4.1 2025-04-30 20:18:25 +02:00
David DuongandGitHub e02c4b06db feat(ui): add merge option to UI messages (#4473)
- Add docs about (partial) streaming UI components from LLMs
- Add missing support for "nostream" in LangGraph
2025-04-30 20:15:57 +02:00
Vadym BardaandGitHub 5b44886da0 docs(agents): add disable_streaming (#4475) 2025-04-30 14:07:19 -04:00
Tat Dat Duong be1af772f5 Fix lint 2025-04-30 20:04:48 +02:00
Vadym BardaandGitHub 33e409e12b docs(agents): add model fallbacks (#4478) 2025-04-30 17:56:58 +00:00
Vadym BardaandGitHub ce2ba47aff docs: cross link working w/ memory in tools (#4464) 2025-04-30 13:52:10 -04:00
Tat Dat Duong b3371a1d63 Add missing "nostream" support 2025-04-30 19:50:14 +02:00
Tat Dat Duong 5804e788d8 Add docs 2025-04-30 19:46:14 +02:00
Vadym BardaandGitHub aa9651910c docs: set package-mode to false for pyproject (#4477) 2025-04-30 12:09:18 -04:00
Sydney RunkleandGitHub 49c10a9188 packaging: removing pydantic v1 support (#4448)
Also moving over any logic from `langchain-core` to here as we slowly
drop `langchain-core` dependency.

Pydantic v1 is no longer undergoing active maintenance and v2 has been
out for almost 2 years, so it seems like an appropriate time to drop v1
scar tissue.
2025-04-30 09:10:47 -04:00
Tat Dat Duong 1b6e12ef14 feat(ui): add merge option to UI messages 2025-04-30 11:52:47 +02:00
David DuongandGitHub a7090ef983 release(sdk): Python 0.1.64 & JS (0.0.71) (#4471) 2025-04-30 10:40:29 +02:00
Tat Dat Duong 20b9b8b1d7 release(sdk): Python 0.1.64 & JS (0.0.71) 2025-04-30 10:33:52 +02:00
William Fu-Hinthorn 91de85a8e6 fix test 2025-04-29 15:55:54 -07:00
David DuongandGitHub 1ec6efab52 fix(sdk-js): avoid sending run metadata in UI messages (#4467) 2025-04-30 00:41:12 +02:00
Tat Dat Duong d0a70a15a8 fix(sdk-js): avoid sending run metadata in UI messages 2025-04-30 00:34:22 +02:00
Sydney Runkle ef1e1659c6 conditional for config 2025-04-29 18:22:18 -04:00
Sydney Runkle c712e09fbc conditional for config 2025-04-29 18:17:33 -04:00
Vadym BardaandGitHub e25dde1df0 docs(reference): filter class methods and add missing docstrings (#4463) 2025-04-29 21:31:57 +00:00
Eugene YurtsevandGitHub 0bfb818e87 docs: process cell magics (#4462)
Handle a small thing that can be fairly confusing to new python users.

Before:


![image](https://github.com/user-attachments/assets/39011f0c-0a7e-4f32-94d7-a40f0b14f2ab)


After:


![image](https://github.com/user-attachments/assets/16aa4429-eb4e-44b5-8714-29279d93c7ea)
2025-04-29 17:13:46 -04:00
d86d0a9311 fix(langgraph): missing conditional edge on get_graph() (#4458)
Co-authored-by: Nuno Campos <nuno@langchain.dev>
2025-04-29 19:49:48 +00:00
Eugene YurtsevandGitHub dbceb3c2e6 docs: remove non directive to stop indexing output code blocks (it doesn't work) (#4461)
This directive seems to have no effect on code blocks: `{
mkdocs-exclude-search }`. Removing it for now.
2025-04-29 15:46:29 -04:00
Sydney Runkle 80dca9b9a5 removing remaining v1 logic 2025-04-29 15:11:37 -04:00
Vadym BardaandGitHub ea55c2d468 docs: simplify docstring / API reference for create_react_agent (#4457) 2025-04-29 18:52:43 +00:00
Eugene YurtsevandGitHub 8dd95a450b docs: strip ansi and exclude outputs from search (#4460)
# Changes

* Strip ANSI codes from outputs
* Exclude outputs from search (relies on an insiders feature, so can't
test locally)

## ANSI Changes

Before


![image](https://github.com/user-attachments/assets/6ca626f3-143b-4f7a-ab4a-0866f0bbf52f)


After


![image](https://github.com/user-attachments/assets/3d2fdb4f-79a0-42d5-9956-e2aa44e3fea2)
2025-04-29 14:50:07 -04:00
Sydney Runkle da0994b741 removing langchain-core pydantic utilities 2025-04-29 14:31:28 -04:00
Vadym BardaandGitHub 80a74a879c docs: expose supervisor, swarm & MCP in the API reference (#4446) 2025-04-29 17:59:42 +00:00
Eugene YurtsevandGitHub 7170a9f0f4 docs: apply boosts and tag a few things (#4455)
Manual pass to apply a few heuristics:

* Boost conceptual pages
* Deboost (is that a word?) index pages that list all content
* Prefer Agents pages if search query contains the word "agent"
* Add tags for a few selected pages
2025-04-29 13:56:57 -04:00
Sydney Runkle 64cfbb0d02 remove v1 test 2025-04-29 13:51:45 -04:00
langchain-infraandGitHub 11b472e876 chore: update eu ips for new cluster (#4454) 2025-04-29 10:54:48 -04:00
infra 5d831726a3 chore: update eu ips for new cluster 2025-04-29 10:50:31 -04:00
David DuongandGitHub 9ffa6371e0 feat(sdk-js): add onLangChainEvent and onDebugEvent to useStream (#4453) 2025-04-29 15:40:09 +02:00
David DuongandGitHub 4d1e5ab71f feat(sdk-js): pass the client instead of apiKey/apiUrl (#4452) 2025-04-29 15:38:47 +02:00
Sydney RunkleandGitHub c0d6524ec7 release: v0.4.0 (#4447) 2025-04-29 09:35:04 -04:00
Tat Dat Duong 8ad5331c89 feat(sdk-js): add onLangChainEvent and onDebugEvent to useStream 2025-04-29 15:34:03 +02:00
Tat Dat Duong cc62a9fa33 feat(sdk-js): pass the client instead of apiKey/apiUrl 2025-04-29 15:17:55 +02:00
David DuongandGitHub b7482a6f6a fix(docs): Studio troubleshooting docs (#4449) 2025-04-29 11:59:39 +02:00
Tat Dat Duong d4df2bd807 fix(docs): Studio troubleshooting docs 2025-04-29 11:58:52 +02:00
Sydney Runkle e99028cfc6 what would it look like to remove pydantic v1 support? 2025-04-28 21:44:17 -04:00
Sydney Runkle 6250b364f7 version bumps and locks 2025-04-28 17:39:20 -04:00
William FHandGitHub 062253fe48 Add examples of configurable headers (#4445) 2025-04-28 12:52:06 -07:00
Sydney RunkleandGitHub fc0d08328d langgraph: fix bug + add test for multi resume (#4444)
Fine if command is "empty" as we don't add writes for mapped resumes.
2025-04-28 15:48:33 -04:00
Sydney Runkle 2bf8e690b0 test + bug fix 2025-04-28 15:41:37 -04:00
Vadym BardaandGitHub 11c6a54de9 docs: small update in the manage message history how to (#4442) 2025-04-28 13:22:52 -04:00
Nuno CamposandGitHub 78581b80c2 Support multiple resume values with Command.resume (#4406)
* Adding support for mapping interrupt ids -> resume values with the
`Command.resume_map` argument, like:

```py
resume_map = {
    i.interrupt_id: f"human input for prompt {i.value}" 
    for i in parent_graph.get_state(thread_config).interrupts 
}

parent_graph.invoke(Command(resume=resume_map), config=thread_config)
```

* Adds an `interrupts` attribute on `StateSnapshot` so that we can
access that directly rather than having to do
`get_state(thread_config).tasks` and then iterate over tasks to find
interrupts

* Deprecates undocumented feature where (if interrupting a graph from
the level of an interrupt), you could pass a dict mapping task ids ->
resume values. Now we recommend and endorse the `interrupt_id` approach
above.

I'll note, from an internal perspective, I would love if we didn't have
to pass around this map, but it seems like the best way right now to
make the necessary resume information necessary at different levels in a
graph with subgraphs.

Fix https://github.com/langchain-ai/langgraph/issues/4028

Slotted to be included in our v0.4.0 release early next week!
2025-04-28 09:06:58 -07:00
vbarda 78f809bc52 update other tests 2025-04-28 12:02:23 -04:00
Sydney Runkle 5fee0d9d66 skip yielding interrupt if input was a map 2025-04-28 11:47:51 -04:00
William FHandGitHub 68e3d70967 Add section in how-to on exclusions (#4441) 2025-04-28 08:42:32 -07:00
William FHandGitHub dc9f2b1109 Add how-to on headers (#4440)
and their configurability for configurability
2025-04-28 15:31:48 +00:00
William FHandGitHub 67aeba6210 Add schema updates for the configurable headers (#4437) 2025-04-28 15:10:07 +00:00
vbarda 4b7ec256e9 prebuilt: switch to executing parallel tool calls via Send by default 2025-04-28 11:07:27 -04:00
Sydney Runkle dbf1c28ccd lint 2025-04-28 10:22:30 -04:00
Sydney Runkle cb25ef985d update loop to append mapped tasks to task specific values 2025-04-28 10:18:39 -04:00
Sydney RunkleandGitHub 2f49ebfd53 packaging: Remove Python Upper Bounds (#4416)
A few notes:
* We shouldn't be using `tool.poetry.dependencies`, that's deprecated -
waiting for a future PR to address this big change though.
* We should remove upper bounds for all deps unless strictly necessary.
2025-04-28 10:03:43 -04:00
David DuongandGitHub d9c781cc7d feat(js): add message-specific fallback UI components (#4430) 2025-04-28 12:17:07 +02:00
David DuongandGitHub 66af72acb3 fix(sdk-js): remove client-only bootstrapping warning (#4428) 2025-04-28 12:05:43 +02:00
Tat Dat Duong a44d822cd3 feat(js): add message-specific fallback UI components 2025-04-28 12:03:58 +02:00
Tat Dat Duong 28d884b37a fix(sdk-js): remove client-only bootstrapping warning 2025-04-28 11:52:26 +02:00
William FHandGitHub d7a0da8f06 checkpointer: Enter stack for blobs dict in InMemorySaver (#4419) 2025-04-26 13:57:36 -07:00
Vadym BardaandGitHub 2d9347ec33 docs(cloud): update human-in-the-loop guides to use interrupt() (#4418) 2025-04-26 13:37:06 -04:00
Sydney Runkle 5e9bea5134 no upper bounds for python 2025-04-25 17:45:54 -07:00
Sydney RunkleandGitHub 5ddc24ba85 Merge branch 'main' into multi-resumes 2025-04-25 17:05:35 -07:00
Sydney Runkle 0362840d0b revert debugging note"
"
2025-04-25 17:00:26 -07:00
Sydney Runkle 44099d27c8 fixing tests 2025-04-25 16:53:37 -07:00
Nuno CamposandGitHub 8951d162f0 Improve logic for drawing virtual end node (#4409)
- Don't draw unexpected edges to END node
- If a conditional edge has a custom label for END node then draw it
2025-04-25 15:45:12 -07:00
Nuno Campos d90126b34e Fix 2025-04-25 15:38:41 -07:00
Nuno CamposandGitHub adc4569daf build(deps): bump h11 from 0.14.0 to 0.16.0 in /libs/checkpoint-sqlite (#4403)
Bumps [h11](https://github.com/python-hyper/h11) from 0.14.0 to 0.16.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/python-hyper/h11/commit/1c5b07581f058886c8bdd87adababd7d959dc7ca"><code>1c5b075</code></a>
this time for surer</li>
<li><a
href="https://github.com/python-hyper/h11/commit/d9c369935e853a7ee1aeb7e481f6dddf9b9c9b8a"><code>d9c3699</code></a>
this time for sure...</li>
<li><a
href="https://github.com/python-hyper/h11/commit/d91b9dd2290a25c8c3f5ec15feb57de5873e6e39"><code>d91b9dd</code></a>
blacken</li>
<li><a
href="https://github.com/python-hyper/h11/commit/5a4683ca466b59bbab9b19cfea20ee157b31cee0"><code>5a4683c</code></a>
Soothe mypy</li>
<li><a
href="https://github.com/python-hyper/h11/commit/9c9567f0a92d13a83a8d8ebdbc757c8c2d384536"><code>9c9567f</code></a>
Bump version to 0.16.0</li>
<li><a
href="https://github.com/python-hyper/h11/commit/114803a29ce50116dc47951c690ad4892b1a36ed"><code>114803a</code></a>
Merge commit from fork</li>
<li><a
href="https://github.com/python-hyper/h11/commit/9462006f6ce4941661888228cbd4ac1ea80689b0"><code>9462006</code></a>
Bump version to 0.15.0</li>
<li><a
href="https://github.com/python-hyper/h11/commit/70a96bea8e55403e5d92db14c111432c6d7a8685"><code>70a96be</code></a>
Merge pull request <a
href="https://redirect.github.com/python-hyper/h11/issues/181">#181</a>
from Julien00859/Julien00859/get_int_max_str_digits</li>
<li><a
href="https://github.com/python-hyper/h11/commit/60782ad107e538b9312aac7e1c119c8358bf797c"><code>60782ad</code></a>
Reject Content-Length longer 1 billion TB</li>
<li><a
href="https://github.com/python-hyper/h11/commit/dff7cc397a26ed4acdedd92d1bda6c8f18a6ed9f"><code>dff7cc3</code></a>
Validate Chunked-Encoding chunk footer</li>
<li>Additional commits viewable in <a
href="https://github.com/python-hyper/h11/compare/v0.14.0...v0.16.0">compare
view</a></li>
</ul>
</details>
<br />


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2025-04-25 15:23:46 -07:00
Nuno Campos 6d70559618 Upgrade 2025-04-25 15:17:06 -07:00
Nuno Campos 70afd2dc2c Update all 2025-04-25 15:11:32 -07:00
ccurmeandGitHub 14e7215090 docs: use langchain-tavily in quickstart (#4412)
We want to deprecate `TavilySearchResults` in langchain-community in
favor of `TavilySearch` in langchain-tavily.

Also update quickstart to use `init_chat_model`.
2025-04-25 17:54:37 -04:00
Nuno Campos 460edde3a7 Lint 2025-04-25 14:37:53 -07:00
Nuno Campos 34d591dedf Improve logic for drawing virtual end node
- Don't draw unexpected edges to END node
- If a conditional edge has a custom label for END node then draw it
2025-04-25 14:37:53 -07:00
Daehwi KimandGitHub 746b5f0730 fix(docs): fix typo (#4411) 2025-04-25 17:10:47 -04:00
Vadym BardaandGitHub 64448404de ci: don't try to render mermaid images when testing notebooks (#4414) 2025-04-25 17:09:18 -04:00
Andrew NguonlyandGitHub 9637f3b1be docs: Document API endpoint for creating new project (#4413) 2025-04-25 10:42:20 -07:00
Sydney Runkle 50449af1a9 add convenient interrupt access to StateSnapshot 2025-04-24 14:52:54 -07:00
Sydney Runkle c2fa33e055 linting etc 2025-04-24 13:28:29 -07:00
Sydney Runkle 644a6c3b63 use resume instead of resume_map and deprecate old mapping task_id -> resume logic 2025-04-24 13:26:01 -07:00
Jacob LeeandGitHub c7fe85585b docs: Adds additional Google Analytics tag to docs (#4402)
CC @danielrlambert3
2025-04-24 13:17:52 -07:00
Sydney Runkle 847b9c13ac adding docs example 2025-04-24 12:36:35 -07:00
Sydney Runkle b6963d35aa multi hitl with new hash pattern 2025-04-24 11:21:25 -07:00
dependabot[bot]andGitHub c6971c6a58 build(deps): bump h11 from 0.14.0 to 0.16.0 in /libs/checkpoint-sqlite
Bumps [h11](https://github.com/python-hyper/h11) from 0.14.0 to 0.16.0.
- [Commits](https://github.com/python-hyper/h11/compare/v0.14.0...v0.16.0)

---
updated-dependencies:
- dependency-name: h11
  dependency-version: 0.16.0
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
2025-04-24 17:46:01 +00:00
Sydney RunkleandGitHub 2327f8619f docs: fix xlinks (api and general) (#4391)
Mostly focusing on the API docs xrefs now working, for example:

<img width="728" alt="Screenshot 2025-04-23 at 6 43 40 PM"
src="https://github.com/user-attachments/assets/e0939edb-2088-4b4e-92b0-8009aac6a86e"
/>

--> 

<img width="737" alt="Screenshot 2025-04-23 at 7 57 28 PM"
src="https://github.com/user-attachments/assets/d05e28b5-cf4f-41e0-96f8-9910d19f4657"
/>

Also fixed some other broken links / references.

There are lots of broken links related to langgraph plans / deployment
options, I think our new docs writer was going to work on those.
2025-04-24 08:47:08 -07:00
Sydney RunkleandGitHub 4eb124e83d [breaking]: Improve interrupt behavior when stream_mode='values' (#4374)
This PR does a few things:
1. Surfaces interrupts when `stream_mode='values'` (particularly
relevant for `invoke`, where this is the default behavior)
2. Adds an `interrupt_id` property to the `Interrupt` dataclass so that
interrupts can effectively be mapped to resumes
3. Minor docs updates to reflect the new pattern (no need for a special
section on interrupts with `invoke` and `ainvoke`)

* In a different PR (the one with the multiple resume values), as it's
more relevant there: add an `interrupts` property to `StateSnapshot` so
that `interrupts` can easily be iterated over if users are attempting to
map interrupts to resumes.

I **don't** recommend we release this until we have multi-resumes
working.

## Example

We have the following setup where we're sending multiple prompts to the
child graph, which uses `interrupt`:

```py
def child_graph(state):
    human_input = interrupt(state["prompt"])

    return {
        "human_inputs": [human_input],
    }
```

<img width="142" alt="Screenshot 2025-04-23 at 10 01 12 AM"
src="https://github.com/user-attachments/assets/c6238bf1-54ad-4e48-ab0b-60a0bfc18485"
/>

Old behavior:

```py
initial_input = {"prompts": ["a", "b"]}

print(parent_graph.invoke(input=initial_input,config=thread_config,stream_mode="values"))
#> {'prompts': ['a', 'b'], 'human_inputs': []}

print(parent_graph.invoke(Command(resume="hello 1"),config=thread_config,stream_mode="values"))
#> {'prompts': ['a', 'b'], 'human_inputs': ['hello 1']}

print(parent_graph.invoke(Command(resume="hello 2"),config=thread_config,stream_mode="values"))
#> {'prompts': ['a', 'b'], 'human_inputs': ['hello 1', 'hello 2']}
```

New behavior:

```py
initial_input = {"prompts": ["a", "b"]}

print(parent_graph.invoke(input=initial_input,config=thread_config,stream_mode="values"))
"""
{
  "prompts": ["a", "b"],
  "human_inputs": [],
  "__interrupt__": [
    Interrupt(
      value="a",
      resumable=True,
      ns=["child_graph:38d43a18-a5e7-8ab2-ca83-9d80f6e9ca83"]
    ),
    Interrupt(
      value="b",
      resumable=True,
      ns=["child_graph:dad810e8-738e-9f90-41cd-30c0091eb79b"]
    )
  ]
}
"""

print(parent_graph.invoke(Command(resume="hello 1"),config=thread_config,stream_mode="values"))
"""
{
  "prompts": ["a", "b"],
  "human_inputs": ["hello 1"],
  "__interrupt__": [
    Interrupt(
      value="b",
      resumable=True,
      ns=["child_graph:dad810e8-738e-9f90-41cd-30c0091eb79b"]
    )
  ]
}
"""

print(parent_graph.invoke(Command(resume="hello 2"),config=thread_config,stream_mode="values"))
#> {'prompts': ['a', 'b'], 'human_inputs': ['hello 1', 'hello 2']}
```
2025-04-24 08:21:28 -07:00
Sydney Runkle 84e9ebda91 add back auto gen content 2025-04-24 08:16:03 -07:00
Sydney Runkle 48e8576fcf remove auto gen file 2025-04-24 08:15:06 -07:00
William FHandGitHub 6263c2f710 Copy with cached property (#4399) 2025-04-24 07:16:37 -07:00
David DuongandGitHub 17bc55028e docs(js): update semver constraints (#4401) 2025-04-24 15:48:17 +02:00
Tat Dat Duong cd8443f5ce docs(js): update semver constraints 2025-04-24 15:47:38 +02:00
David DuongandGitHub 7e3f31f97c docs(js): update required semver ranges (#4396) 2025-04-24 12:41:12 +02:00
Tat Dat Duong 3db9bf325c docs(js): update required semver ranges 2025-04-24 12:37:26 +02:00
Sydney Runkle 97337355a2 formatting 2025-04-23 21:21:02 -07:00
Sydney Runkle d6c12133ad fixing links 2025-04-23 21:15:55 -07:00
Sydney Runkle d67abdd112 fix docs build 2025-04-23 20:07:16 -07:00
Sydney Runkle 8dec77e129 remove bounds on mkdocs deps 2025-04-23 18:42:42 -07:00
Sydney Runkle b81c21f311 docs updates 2025-04-23 17:48:47 -07:00
Sydney Runkle cd6b086374 await 2025-04-23 16:36:37 -07:00
Sydney Runkle 5929b0b08d more test fixes 2025-04-23 16:19:46 -07:00
Sydney Runkle 9f33b4e529 fix test to reflect bug fix 2025-04-23 16:03:08 -07:00
Sydney RunkleandGitHub f0fb8d9187 Merge branch 'main' into sr/better-interrupts 2025-04-23 15:58:57 -07:00
Sydney RunkleandGitHub 0ff913c50b Fix double interrupt return caused by dynamic tasks (#4389)
Fix issue found in
https://github.com/langchain-ai/langgraph/pull/4374#discussion_r2056701206
2025-04-23 15:56:47 -07:00
Sydney RunkleandGitHub 67075bfb7f Update libs/langgraph/tests/test_pregel_async.py 2025-04-23 15:50:22 -07:00
Sydney Runkle 37b2956758 helpful comments + test 2025-04-23 14:24:57 -07:00
Sydney Runkle f42fc971e3 fix double interrupt raise with task path bool flag 2025-04-23 14:16:35 -07:00
Vadym BardaandGitHub 6bcab08f55 langgraph: release 0.3.33 (#4388) 2025-04-23 16:28:12 -04:00
Sydney Runkle 8fe7c8101f more explicit tests 2025-04-23 11:49:26 -07:00
Vadym BardaandGitHub 6bca615e6a langgraph: allow nested lists/dicts of primitives in RemoteGraph config (#4387) 2025-04-23 14:04:54 -04:00
Vadym BardaandGitHub 0147790937 langgraph: release 0.3.32 (#4386) 2025-04-23 11:51:29 -04:00
Vadym BardaandGitHub 364c572f0f langgraph: fix messages streaming for list of Commands (#4379)
Fixes #4372
2025-04-23 11:46:57 -04:00
langchain-infraandGitHub 8af4b63c69 docs: Add docs for REDIS_KEY_PREFIX, REDIS_CLUSTER env vars (#4334)
# Description 

Add documentation for using the REDIS_KEY_PREFIX, REDIS_CLUSTER env
vars.
2025-04-23 11:17:03 -04:00
Asamu DavidandGitHub 941b4b1287 Merge branch 'main' into da/4-17/add-redis-prefix-support 2025-04-23 15:52:30 +01:00
Asamu DavidandGitHub 24f04fba37 Update REDIS_CLUSTER env doc.md 2025-04-23 15:52:07 +01:00
William FHandGitHub 05f21a384b Add image arg to up command (#4385)
Using this argument, you can get more customization since you can do
`langgraph build` or directly `docker build` your image and then re-use
the `langgraph up --image my-image` and have it also spin up redis &
postgres for you.

Easier then writing your own compose file
2025-04-23 07:48:01 -07:00
Vadym BardaandGitHub 29e9ee2d7b docs(agents): use list of messages format (#4378) 2025-04-23 01:25:00 +00:00
Sydney Runkle d6b4ee348f goodness, last test fix 2025-04-22 17:32:13 -07:00
Sydney Runkle 9e89b68596 fixing prebuilt tests 2025-04-22 17:24:54 -07:00
Sydney Runkle 1251eeaa48 final test fixes, hopefully 2025-04-22 17:21:56 -07:00
Sydney Runkle 85e73653f9 linting and test fixes 2025-04-22 17:10:54 -07:00
Sydney RunkleandGitHub a8b70cb23c Merge branch 'main' into sr/better-interrupts 2025-04-22 13:48:03 -07:00
Sydney RunkleandGitHub 173627a94c langgraph[lint]: Upgrade to Python 3.9+ syntax (#4368)
Also added "UP" (pyupgrade) rule to `pyproject.toml`
2025-04-22 13:47:18 -07:00
Sydney Runkle edd7d608cd final linting 2025-04-22 13:40:53 -07:00
Sydney Runkle 8977a35060 linting post merge 2025-04-22 13:01:40 -07:00
Sydney RunkleandGitHub 0a6e5a18bb Merge branch 'main' into pyupgrade-39 2025-04-22 12:30:53 -07:00
Sydney Runkle abc6323c6c Merge branch 'sr/better-interrupts' of https://github.com/langchain-ai/langgraph into sr/better-interrupts 2025-04-22 11:39:24 -07:00
Sydney Runkle d5a1bb05f5 revert changes to lockfile 2025-04-22 11:35:56 -07:00
Sydney Runkle 8506c6655b more linting 2025-04-22 11:34:38 -07:00
Sydney RunkleandGitHub 44af4d8e3e Merge branch 'main' into sr/better-interrupts 2025-04-22 11:31:46 -07:00
Sydney Runkle 8e6c0be48a try linting + maybe test fix 2025-04-22 11:28:09 -07:00
Sydney Runkle 35523f4081 linting 2025-04-22 10:34:24 -07:00
Sydney Runkle 9a7b1fa12a initial pass - surfacing interrupts for stream_mode='values' 2025-04-22 10:15:19 -07:00
Nuno CamposandGitHub 71bf2f9e85 Rewrite graph drawing logic (#4354)
- It now executes the same pregel algo as when the graph is executed
(without running any user code in nodes or conditional edges) to
discover all the edges
- This means we now support drawing the graph for all Pregel instances,
not just StateGraph
- This is done in preparation for new edge/node type coming in separate
PR
- Known changes
  - custom labels on conditional edges to END are no longer displayed
2025-04-22 09:31:13 -07:00
Nuno Campos b03c647677 Lint 2025-04-22 08:45:50 -07:00
Nuno Campos 5d49188d3e Lint 2025-04-22 08:41:51 -07:00
Nuno Campos deeb2d6e92 Fix 2025-04-22 08:36:42 -07:00
Nuno Campos 0db67d4196 Fix 2025-04-22 08:36:42 -07:00
Nuno Campos 56c9c210c3 Fix 2025-04-22 08:36:42 -07:00
Nuno Campos 3398715258 Rewrite graph drawing logic
- It now executes the same pregel algo as when the graph is executed (without running any user code in nodes or conditional edges) to discover all the edges
- This means we now support drawing the graph for all Pregel instances, not just StateGraph
2025-04-22 08:36:41 -07:00
William Fu-Hinthorn 38d806733d Update site_description
Signed-off-by: William Fu-Hinthorn <13333726+hinthornw@users.noreply.github.com>
2025-04-22 08:18:10 -07:00
William FHandGitHub 86ddd8da10 Add docs on tunneling (#4371)
Signed-off-by: William Fu-Hinthorn <13333726+hinthornw@users.noreply.github.com>
2025-04-22 15:04:04 +00:00
William FHandGitHub a5f5d0c4df Expose --tunnel flag to dev command (#4370)
Signed-off-by: William Fu-Hinthorn <13333726+hinthornw@users.noreply.github.com>
2025-04-22 14:23:09 +00:00
Sydney Runkle cba7d21732 fix tests? 2025-04-21 21:14:14 -07:00
Sydney Runkle b6ea73ff24 linting for 3.12 2025-04-21 21:01:27 -07:00
Sydney Runkle 1a477e57ff upgrade to py39 standards 2025-04-21 20:43:40 -07:00
lc-arjunandGitHub 7486adabdf fix: threads search sorting defaults (#4365)
Removes default from https://github.com/langchain-ai/langgraph/pull/4362
2025-04-21 20:49:16 -04:00
William FHandGitHub 12ad47e4e8 Use model_validate if needed (#4363)
If the state schema uses validators, skip the model construct
optimization.

For context, pydantic state can be significantly slower to run than
typed dict and dataclass states due to the full recursive validation.

We have some optimizations to reduce the impact of this (using cached
validators with model_construct), but this doesn't handle things like
field_validator.

We prefer correctness over performance, obviously.

Resolves: https://github.com/langchain-ai/langgraph/issues/4074

Signed-off-by: William Fu-Hinthorn <13333726+hinthornw@users.noreply.github.com>
2025-04-21 21:53:58 +00:00
lc-arjunandGitHub 90f7f776cf feat: threads sorting sdk spec (#4362) 2025-04-21 14:42:43 -07:00
William FHandGitHub c7306f7aed Add log json env var (#4348) 2025-04-18 20:44:50 +00:00
William FHandGitHub 20bd71e289 Bump lockfile (#4346) 2025-04-18 08:43:58 -07:00
William Fu-Hinthorn 283485753f Format notebook 2025-04-18 08:35:31 -07:00
ba7f9975fa Fix text fields naming (#4345)
The configuration expects the key "fields", not "text_fields": I had
failed to update across all implementations in the original PR

Thank you to Vincent Min for the fix!
---------

Co-authored-by: Vincent Min <93780551+VMinB12@users.noreply.github.com>
2025-04-18 08:21:46 -07:00
David DuongandGitHub 8c4904bee9 fix(sdk-js): make sure to wrap client component in UseStreamContext (#4338) 2025-04-18 01:08:38 +02:00
Tat Dat Duong 6bb06b8702 fix(sdk-js): make sure to wrap client component in UseStreamContext 2025-04-18 01:07:13 +02:00
Vadym BardaandGitHub 7a16e33833 docs: fix notebook runner (#4337) 2025-04-17 22:43:41 +00:00
David Asamu f94eeabebd add doc for REDIS_CLUSTER env var 2025-04-17 23:20:53 +01:00
Asamu DavidandGitHub 9e22a75423 Merge branch 'main' into da/4-17/add-redis-prefix-support 2025-04-17 22:30:10 +01:00
Vadym BardaandGitHub 3da5c73a04 checkpoint-postgres: release 2.0.20 (#4335) 2025-04-17 17:08:18 -04:00
David Asamu e0da491fe6 docs: Add docs for REDIS_KEY_PREFIX env var 2025-04-17 21:38:41 +01:00
David DuongandGitHub e818f83a92 feat(cli): add internal docker tag support (#4333) 2025-04-17 22:32:31 +02:00
Tat Dat Duong e478a8deb9 Update schema 2025-04-17 22:25:47 +02:00
Tat Dat Duong 4bbdfbf381 Cleanup 2025-04-17 22:23:44 +02:00
Tat Dat Duong db1fbe74cc Revert args 2025-04-17 22:22:43 +02:00
Tat Dat Duong 01ce86ad9b Bump to 0.2.5 2025-04-17 22:21:42 +02:00
Tat Dat Duong d5f73fe37b Add tests 2025-04-17 22:21:23 +02:00
Tat Dat Duong 5a200cd89e feat(cli): add internal docker tag support 2025-04-17 22:15:10 +02:00
Nuno Campos 6082bcf8d3 0.3.31 2025-04-17 10:01:29 -07:00
18a9ae45f3 Add delete_thread method to Checkpointer class (#4328)
- Deletes all data associated with a thread_id
- Implemented in InMemory, Sqlite and Postgres checkpointers

Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
2025-04-17 16:38:58 +00:00
Vadym BardaandGitHub 83bf004ad7 docs: remove old prebuilt file (#4330) 2025-04-17 12:10:32 -04:00
Vadym BardaandGitHub 72114c6c33 docs: add missing prebuilt file (#4329) 2025-04-17 12:01:32 -04:00
88b57df15b docs: add agents section (#4189)
Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
2025-04-17 11:53:05 -04:00
Daehwi KimandGitHub abfb88e5d7 fix(docs): fix typo (#4320)
Correct a typo in documentation: 'thedocker' changed to 'the docker'
2025-04-17 11:19:58 -04:00
Vadym BardaandGitHub 49f063e076 langgraph: update min bound for prebuilt (#4319) 2025-04-17 13:19:31 +00:00
William FHandGitHub 30f9bcd8de Make docstring even less ambiguous (#4308) 2025-04-16 23:39:04 +00:00
336 changed files with 21183 additions and 17953 deletions
+1
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@@ -180,3 +180,4 @@ Chinook.db
.vercel
.turbo
.editorconfig
+1 -1
View File
@@ -19,7 +19,7 @@ build-prebuilt:
poetry run python -m _scripts.third_party_page.get_download_stats --fake stats.yml; \
set +x; \
fi
poetry run python -m _scripts.third_party_page.create_third_party_page stats.yml docs/prebuilt.md --language python
poetry run python -m _scripts.third_party_page.create_third_party_page stats.yml docs/agents/prebuilt.md --language python
build-docs: build-typedoc build-prebuilt
poetry run python -m mkdocs build --clean -f mkdocs.yml --strict
+1 -1
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@@ -58,4 +58,4 @@ To delete cassettes for a notebook, you can run:
```bash
rm cassettes/<notebook_name>*
```
```
+28 -5
View File
@@ -22,6 +22,12 @@ MANUAL_API_REFERENCES_LANGGRAPH = [
"create_react_agent",
"prebuilt",
),
(
[],
"langgraph.prebuilt.chat_agent_executor",
"AgentState",
"prebuilt",
),
(["langgraph.prebuilt"], "langgraph.prebuilt.tool_node", "ToolNode", "prebuilt"),
(
["langgraph.prebuilt"],
@@ -45,6 +51,8 @@ MANUAL_API_REFERENCES_LANGGRAPH = [
(["langgraph.constants"], "langgraph.types", "Interrupt", "types"),
(["langgraph.constants"], "langgraph.types", "interrupt", "types"),
(["langgraph.constants"], "langgraph.types", "Command", "types"),
(["langgraph.config"], "langgraph.config", "get_stream_writer", "config"),
(["langgraph.config"], "langgraph.config", "get_store", "config"),
(["langgraph.func"], "langgraph.func", "entrypoint", "func"),
(["langgraph.func"], "langgraph.func", "task", "func"),
(["langgraph.types"], "langgraph.types", "RetryPolicy", "types"),
@@ -56,10 +64,23 @@ MANUAL_API_REFERENCES_LANGGRAPH = [
([], "langgraph.checkpoint.base", "SerializerProtocol", "checkpoints"),
([], "langgraph.checkpoint.serde.jsonplus", "JsonPlusSerializer", "checkpoints"),
([], "langgraph.checkpoint.memory", "MemorySaver", "checkpoints"),
([], "langgraph.checkpoint.memory", "InMemorySaver", "checkpoints"),
([], "langgraph.checkpoint.sqlite.aio", "AsyncSqliteSaver", "checkpoints"),
([], "langgraph.checkpoint.sqlite", "SqliteSaver", "checkpoints"),
([], "langgraph.checkpoint.postgres.aio", "AsyncPostgresSaver", "checkpoints"),
([], "langgraph.checkpoint.postgres", "PostgresSaver", "checkpoints"),
# other prebuilts
(["langgraph_supervisor"], "langgraph_supervisor.supervisor", "create_supervisor", "supervisor"),
(["langgraph_supervisor"], "langgraph_supervisor.handoff", "create_handoff_tool", "supervisor"),
([], "langgraph_supervisor.handoff", "create_forward_message_tool", "supervisor"),
(["langgraph_swarm"], "langgraph_swarm.swarm", "create_swarm", "swarm"),
(["langgraph_swarm"], "langgraph_swarm.swarm", "add_active_agent_router", "swarm"),
(["langgraph_swarm"], "langgraph_swarm.swarm", "SwarmState", "swarm"),
(["langgraph_swarm"], "langgraph_swarm.handoff", "create_handoff_tool", "swarm"),
([], "langchain_mcp_adapters.client", "MultiServerMCPClient", "mcp"),
([], "langchain_mcp_adapters.tools", "load_mcp_tools", "mcp"),
([], "langchain_mcp_adapters.prompts", "load_mcp_prompt", "mcp"),
([], "langchain_mcp_adapters.resources", "load_mcp_resources", "mcp"),
]
WELL_KNOWN_LANGGRAPH_OBJECTS = {
@@ -141,7 +162,9 @@ def get_imports(code: str, path: str) -> List[ImportInformation]:
for found_import in found_imports:
module = found_import["source"]
if module.startswith("langchain"):
if module.startswith("langchain_mcp_adapters"):
package_ecosystem = "langgraph"
elif module.startswith("langchain"):
# Handles things like `langchain` or `langchain_anthropic`
package_ecosystem = "langchain"
elif module.startswith("langgraph"):
@@ -214,7 +237,7 @@ def update_markdown_with_imports(markdown: str, path: str) -> str:
path: The path of the file where the markdown content originated.
Returns:
Updated markdown with API reference links appended to Python code blocks.
Updated markdown with API reference links prepended to Python code blocks.
Example:
Given a markdown with a Python code block:
@@ -237,7 +260,7 @@ def update_markdown_with_imports(markdown: str, path: str) -> str:
match (re.Match): The regex match object containing the code block.
Returns:
str: The modified code block with API reference links appended if applicable.
str: The modified code block with API reference links prepended if applicable.
"""
indent = match.group("indent")
code_block = match.group("code")
@@ -253,8 +276,8 @@ def update_markdown_with_imports(markdown: str, path: str) -> str:
api_links = " | ".join(
f'<a href="{imp["docs"]}">{imp["imported"]}</a>' for imp in imports
)
# Return the code block with appended API reference links
return f"{original_code_block}\n\n{indent}API Reference: {api_links}"
# Return the code block with prepended API reference links
return f"{indent}<sup><i>API Reference: {api_links}</i></sup>\n\n{original_code_block}"
# Apply the replace_code_block function to all matches in the markdown
updated_markdown = code_block_pattern.sub(replace_code_block, markdown)
+33 -14
View File
@@ -1,7 +1,6 @@
import ast
import os
import re
from pathlib import Path
from typing import Literal
import nbformat
@@ -26,7 +25,7 @@ def _uses_input(source: str) -> bool:
def _rewrite_cell_magic(code: str) -> str:
"""Process a code block that uses cell magic.:w
"""Process a code block that uses cell magic.
- Lines starting with "%%capture" are ignored.
- Lines starting with "%pip" are rewritten by removing the leading "%" character.
@@ -52,10 +51,14 @@ def _rewrite_cell_magic(code: str) -> str:
if stripped.startswith("%%capture"):
continue
# Rewrite %pip lines by dropping the '%'
elif stripped.startswith("%pip"):
# Drop the leading '%' character
rewritten_lines.append(stripped[1:])
# Anything else is not supported
elif stripped.startswith("%") or stripped.startswith("!"):
# Drop the leading '%' character and then drop all leading whitespace
stripped = stripped.lstrip("%! \t")
# Check if the line starts with "pip"
if stripped.startswith("pip"):
rewritten_lines.append(stripped)
else:
raise NotImplementedError(f"Unhandled line: {line}")
else:
raise NotImplementedError(f"Unhandled line: {line}")
@@ -217,6 +220,24 @@ def _convert_links_in_markdown(markdown: str) -> str:
)
class HideCellTagPreprocessor(Preprocessor):
"""
Removes cells that have '# hide-cell' at the beginning of the cell content.
This allows authors to include cells in the notebook that should not
appear in the generated markdown output.
"""
def preprocess(self, nb, resources):
# Filter out cells with the '# hide-cell' comment at the beginning
nb.cells = [
cell
for cell in nb.cells
if not (cell.source.strip().startswith("# hide-cell"))
]
return nb, resources
class EscapePreprocessor(Preprocessor):
def __init__(self, markdown_exec_migration: bool = False, **kwargs) -> None:
super().__init__(**kwargs)
@@ -247,13 +268,10 @@ class EscapePreprocessor(Preprocessor):
)
cell.metadata["exec"] = is_exec
if self.markdown_exec_migration:
# For markdown exec migration we'll re-write cell magic as bash commands
if source.startswith("%%"):
cell.source = _rewrite_cell_magic(source)
cell.metadata["language"] = "shell"
cell.metadata["has_output"] = _has_output(source)
# For markdown exec migration we'll re-write cell magic as bash commands
if source.startswith("%%"):
cell.source = _rewrite_cell_magic(source)
cell.metadata["language"] = "shell"
# Remove noqa comments
cell.source = re.sub(r"#\s*noqa.*$", "", cell.source, flags=re.MULTILINE)
@@ -341,6 +359,7 @@ class ExtractAttachmentsPreprocessor(Preprocessor):
exporter = MarkdownExporter(
preprocessors=[
HideCellTagPreprocessor,
EscapePreprocessor,
ExtractAttachmentsPreprocessor,
],
@@ -352,7 +371,7 @@ exporter = MarkdownExporter(
def convert_notebook(
notebook_path: Path,
notebook_path: str,
mode: Literal["markdown", "exec"] = "markdown",
) -> str:
with open(notebook_path) as f:
@@ -1,5 +1,18 @@
{% extends 'markdown/index.md.j2' %}
{% block input %}{# cell.metadata.language is an addition of our docs pipeline. #}
```{%- if 'language' in cell.metadata -%}
{{ cell.metadata.language }}
{%- elif 'magics_language' in cell.metadata -%}
{{ cell.metadata.magics_language }}
{%- elif 'name' in nb.metadata.get('language_info', {}) -%}
{{ nb.metadata.language_info.name }}
{%- endif %}
{{ cell.source }}
```
{% endblock input %}
{%- block traceback_line -%}
```output
{{ line.rstrip() | strip_ansi }}
@@ -8,13 +21,13 @@
{%- block stream -%}
```output
{{ output.text.rstrip() }}
{{ output.text.rstrip() | strip_ansi }}
```
{%- endblock stream -%}
{%- block data_text scoped -%}
```output
{{ output.data['text/plain'].rstrip() }}
{{ output.data['text/plain'].rstrip() | strip_ansi }}
```
{%- endblock data_text -%}
+9
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@@ -31,6 +31,15 @@ REDIRECT_MAP = {
"cloud/concepts/api.md": "concepts/langgraph_server.md",
"cloud/concepts/cloud.md": "concepts/langgraph_cloud.md",
"cloud/faq/studio.md": "concepts/langgraph_studio.md#studio-faqs",
# prebuit redirects
"how-tos/create-react-agent.ipynb": "agents/agents.md#basic-configuration",
"how-tos/create-react-agent-memory.ipynb": "agents/memory.md",
"how-tos/create-react-agent-system-prompt.ipynb": "agents/context.md#prompts",
"how-tos/create-react-agent-hitl.ipynb": "agents/human-in-the-loop.md",
"how-tos/create-react-agent-structured-output.ipynb": "agents/agents.md#structured-output",
# misc
"prebuilt.md": "agents/prebuilt.md",
"reference/prebuilt.md": "reference/agents.md"
}
+22 -2
View File
@@ -20,7 +20,6 @@ BLOCKLIST_COMMANDS = (
NOTEBOOKS_NO_CASSETTES = (
"docs/how-tos/visualization.ipynb",
"docs/how-tos/many-tools.ipynb"
)
NOTEBOOKS_NO_EXECUTION = [
@@ -49,7 +48,10 @@ NOTEBOOKS_NO_EXECUTION = [
"docs/how-tos/map-reduce.ipynb", # flakiness from structured output, only when running with VCR
"docs/tutorials/tot/tot.ipynb",
"docs/how-tos/visualization.ipynb",
"docs/tutorials/llm-compiler/LLMCompiler.ipynb"
"docs/how-tos/streaming-specific-nodes.ipynb",
"docs/tutorials/llm-compiler/LLMCompiler.ipynb",
"docs/tutorials/customer-support/customer-support.ipynb", # relies on openai embeddings, doesn't play well w/ VCR
"docs/how-tos/many-tools.ipynb", # relies on openai embeddings, doesn't play well w/ VCR
]
@@ -86,6 +88,13 @@ def has_blocklisted_command(code: str, metadata: dict) -> bool:
return True
return False
def remove_mermaid(code: str) -> str:
return code.replace(
"display(Image(graph.get_graph().draw_mermaid_png()))",
# replace with a dummy statement
"print()"
)
def add_vcr_to_notebook(
notebook: nbformat.NotebookNode, cassette_prefix: str
@@ -180,6 +189,15 @@ def add_vcr_to_notebook(
return notebook
def remove_mermaid_from_notebook(notebook: nbformat.NotebookNode) -> nbformat.NotebookNode:
for cell in notebook.cells:
if cell.cell_type != "code":
continue
cell.source = remove_mermaid(cell.source)
return notebook
def process_notebooks(should_comment_install_cells: bool) -> None:
for directory in NOTEBOOK_DIRS:
for root, _, files in os.walk(directory):
@@ -201,6 +219,8 @@ def process_notebooks(should_comment_install_cells: bool) -> None:
notebook, cassette_prefix=cassette_prefix
)
notebook = remove_mermaid_from_notebook(notebook)
if notebook_path in NOTEBOOKS_NO_EXECUTION:
# Add a cell at the beginning to indicate that this notebook should not be executed
warning_cell = nbformat.v4.new_markdown_cell(
@@ -9,10 +9,7 @@ import yaml
MARKDOWN = """\
[//]: # (This file is automatically generated using a script in docs/_scripts. Do not edit this file directly!)
# 🚀 Prebuilt Agents
LangGraph includes a prebuilt React agent. For more information on how to use it,
check out our [how-to guides](https://langchain-ai.github.io/langgraph/how-tos/#prebuilt-react-agent).
# Community Agents
If youre looking for other prebuilt libraries, explore the community-built options
below. These libraries can extend LangGraph's functionality in various ways.
@@ -0,0 +1 @@
eNrVVk1vHMcRRW75GY1FAMXGzn7MUiQlwTAokv6KRAogg1iQjUXvTM1MhzPd4+4erjaOAEUJDPi4yCm3IGLEQPDXyUEO9jmH/AH5qLN/RF717JJcSrLhowEC3Omurnqv6lV1Pzo9JuuU0b/4TGlPViYeH27+6NTSRw05/5cnFfnCpCd39g8OHzdWfVN4X7vr/b6sVc/LY1XOeomp+o6kTYqTiUlnz5593MFhO+tcF51pYYRywhckKjkzVphM7N3dfrPTFZ1K3h9bck3pHUxHWGm9jFOqfcGnJ9KphE2VTsompbHUbkoWW5ksHV3YsHI6Tgw4aP+SXVXJnNyrNhDPJVbVgfsFI29qRAeMnDRyU3YenBYkU2Tsk6e/dWSjLWz4+df1DCnS0SJlrh/3Rvj7citJwCPa1YlJlc7nn+d/UHVXpJSV0tOTdnv++PX+60+3jdYUcj9/ekRUR7JUx/TZdksoOpzVNP9K1nWpEslW/d87o79Ybt8infti/jgebvwL+azBgv78xHnpG/foBNHpf/89rcg5cP3H/m+WJD492QGO+TeHRdMVg6G4LWciHsRXRTy6Hg+vD0bi7duHl4OcxPHm2pMDshDO/J86V/r+K9D/58BblQC8RdFqY310QAkU5GfzZ79C6SOgeWM0vDpaHwwG4oZYlOSgmeyYSirtfoT+vxfljtzCbVQbGMD7t0ixhKoiZxNxRRtNV26ItsLtkqMyw1LS4l5ZU1W+8u38rKSLK5AkRYi3/M6MraK2b84OsRKUpcjbxnlKIw8CLoIlLAIM2DR1blGGCEQZP53J58bX70cXmUf7rTDnp9o4rbLsy/ejt6yszjdOdnb37obW+xOqbqG17375/VkP/kALdjJTlmY6bupxiN3qXzdl2e0sO639WjbQvQ+7nbOWvfdxxytfEmLsZ5lKiD1zmNshzB/b/1ecuKkMvrZRoxCbpuKusUciYhi93BwDSWNLuFkOl+l02tOzhPf6JriOTBbBdRQY9CfK9GogwsGzpu+0UXchOrGVysqJQjrhWKlpQFWTqUtaQRAgwUpqQLmzI9pYtisO0DwkDkhLb/B50xpzVM60uGmsafJC3EESVIq4XZxNhTZTdsNRhsOBLxYZWKTjMvGeeIdELo9JHBvOmjdCilTxKCaIEt0T1IQTU1ijnJhIlSoVOTSJkGUpMhiLSYvFBQQocIm2ZmMOmam88Ox4wnIQE5kcrbJ+/vBvThCSZ6pZF4JNGwBRGhrk8FhSVW0NotTNBF0lnMyIlznWpFFlCsjQmtE5pwsTpfSFIisS5uoL6THnykBJsO4Z9DI+1nriZ1QsiJTTK4Xnhq0koLAbBsvVCwuvOgyBusRYtMigt7k+GozWRhvooIuXFTfYg+55K13ISSR+p45UTamSL7QI6d50udkzNu/zV58Pj8PhldYIPm+RNbOF519DPBopqz1VE5Rt2BXDa+uD1wJRLbYqwgn84JHqVaLwkznzsIN1GLS0LIDgAXOhfCu5PZ84K2V0mPbEt03cEx903sOYZIc7VEvrK2BGO1iMZicgQp6PKKxjOafW1CKjlK9jtIq1TZiBIsFUFjLna8NfCvWC0jCJ9vbEnZaZ+6CzUqSNtc342sb6j9TolkIYkArs3Iv0fnrh2OPYZOPWI/+CxzF7HLPHlWq+W9VUAj0ebKp7ru6lCFehbJtGJ6rsigkluDQEX1WYCG1dpgVpsX9lZzpDGdlPrlFA5HOryVETMQq6uDpoG2faVlYLKlEbblQTArY6CLNJuJqglrI14coUVAaPexgmQWobrcue2EfoxBtei7vQwmCzK26rpJBUipulMWydI7BmBmEsYKog3NQ0PH7cUQgeBk7SkmRAdB9ZamdIqSrlw/gJbLtnZkzGwMIuJYwhZU0l/BSEyFauZWaJWuIcuStcEQK7Jim4R9pAwNWGqS0dS84zAheq4pfAAqkjOkJyo7OUII0BUO9evP7hShrwBn5lBXFZcM7ja88f/jWOL1EF8oiRL8As4bdseuJdftxzr3AaA8HLksUtvazqQtRtiw43R2u7FzduSehiYbrLecyWkzAEURUnKMFjE2l//vDvPFni3QXzpaNzi9F7ptDicKUF16+tr21cjV/Wgu3rIzxwx15VMB/2NuIH/wfOR5bE
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@@ -1 +0,0 @@
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@@ -1 +0,0 @@
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@@ -1 +0,0 @@
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@@ -1 +1 @@
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---
search:
boost: 2
tags:
- agent
hide:
- tags
---
# Agents
## What is an agent?
An *agent* consists of three components: a **large language model (LLM)**, a set of **tools** it can use, and a **prompt** that provides instructions.
The LLM operates in a loop. In each iteration, it selects a tool to invoke, provides input, receives the result (an observation), and uses that observation to inform the next action. The loop continues until a stopping condition is met — typically when the agent has gathered enough information to respond to the user.
<figure markdown="1">
![image](./assets/agent.png){: style="max-height:400px"}
<figcaption>Agent loop: the LLM selects tools and uses their outputs to fulfill a user request.</figcaption>
</figure>
## Basic configuration
Use [`create_react_agent`][langgraph.prebuilt.chat_agent_executor.create_react_agent] to instantiate an agent:
```python
from langgraph.prebuilt import create_react_agent
def get_weather(city: str) -> str: # (1)!
"""Get weather for a given city."""
return f"It's always sunny in {city}!"
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest", # (2)!
tools=[get_weather], # (3)!
prompt="You are a helpful assistant" # (4)!
)
# Run the agent
agent.invoke(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]}
)
```
1. Define a tool for the agent to use. Tools can be defined as vanilla Python functions. For more advanced tool usage and customization, check the [tools](./tools.md) page.
2. Provide a language model for the agent to use. To learn more about configuring language models for the agents, check the [models](./models.md) page.
3. Provide a list of tools for the model to use.
4. Provide a system prompt (instructions) to the language model used by the agent.
## LLM configuration
Use [init_chat_model](https://python.langchain.com/api_reference/langchain/chat_models/langchain.chat_models.base.init_chat_model.html) to configure an LLM with specific parameters,
such as temperature:
```python
from langchain.chat_models import init_chat_model
from langgraph.prebuilt import create_react_agent
# highlight-next-line
model = init_chat_model(
"anthropic:claude-3-7-sonnet-latest",
# highlight-next-line
temperature=0
)
agent = create_react_agent(
# highlight-next-line
model=model,
tools=[get_weather],
)
```
See the [models](./models.md) page for more information on how to configure LLMs.
## Custom Prompts
Prompts instruct the LLM how to behave. They can be:
* **Static**: A string is interpreted as a **system message**
* **Dynamic**: a list of messages generated at **runtime** based on input or configuration
### Static prompts
Define a fixed prompt string or list of messages.
```python
from langgraph.prebuilt import create_react_agent
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
# A static prompt that never changes
# highlight-next-line
prompt="Never answer questions about the weather."
)
agent.invoke(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]}
)
```
### Dynamic prompts
Define a function that returns a message list based on the agent's state and configuration:
```python
from langchain_core.messages import AnyMessage
from langchain_core.runnables import RunnableConfig
from langgraph.prebuilt.chat_agent_executor import AgentState
from langgraph.prebuilt import create_react_agent
# highlight-next-line
def prompt(state: AgentState, config: RunnableConfig) -> list[AnyMessage]: # (1)!
user_name = config["configurable"].get("user_name")
system_msg = f"You are a helpful assistant. Address the user as {user_name}."
return [{"role": "system", "content": system_msg}] + state["messages"]
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
# highlight-next-line
prompt=prompt
)
agent.invoke(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
# highlight-next-line
config={"configurable": {"user_name": "John Smith"}}
)
```
1. Dynamic prompts allow including non-message [context](./context.md) when constructing an input to the LLM, such as:
- Information passed at runtime, like a `user_id` or API credentials (using `config`).
- Internal agent state updated during a multi-step reasoning process (using `state`).
Dynamic prompts can be defined as functions that take `state` and `config` and return a list of messages to send to the LLM.
See the [context](./context.md) page for more information.
## Memory
To allow multi-turn conversations with an agent, you need to enable [persistence](../concepts/persistence.md) by providing a `checkpointer` when creating an agent. At runtime you need to provide a config containing `thread_id` — a unique identifier for the conversation (session):
```python
from langgraph.prebuilt import create_react_agent
from langgraph.checkpoint.memory import InMemorySaver
# highlight-next-line
checkpointer = InMemorySaver()
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
# highlight-next-line
checkpointer=checkpointer # (1)!
)
# Run the agent
# highlight-next-line
config = {"configurable": {"thread_id": "1"}}
sf_response = agent.invoke(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
# highlight-next-line
config # (2)!
)
ny_response = agent.invoke(
{"messages": [{"role": "user", "content": "what about new york?"}]},
# highlight-next-line
config
)
```
1. `checkpointer` allows the agent to store its state at every step in the tool calling loop. This enables [short-term memory](./memory.md#short-term-memory) and [human-in-the-loop](./human-in-the-loop.md) capabilities.
2. Pass configuration with `thread_id` to be able to resume the same conversation on future agent invocations.
When you enable the checkpointer, it stores agent state at every step in the provided checkpointer database (or in memory, if using `InMemorySaver`).
Note that in the above example, when the agent is invoked the second time with the same `thread_id`, the original message history from the first conversation is automatically included, together with the new user input.
Please see the [memory guide](./memory.md) for more details on how to work with memory.
## Structured output
To produce structured responses conforming to a schema, use the `response_format` parameter. The schema can be defined with a `Pydantic` model or `TypedDict`. The result will be accessible via the `structured_response` field.
```python
from pydantic import BaseModel
from langgraph.prebuilt import create_react_agent
class WeatherResponse(BaseModel):
conditions: str
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
# highlight-next-line
response_format=WeatherResponse # (1)!
)
response = agent.invoke(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]}
)
# highlight-next-line
response["structured_response"]
```
1. When `response_format` is provided, a separate step is added at the end of the agent loop: agent message history is passed to an LLM with structured output to generate a structured response.
To provide a system prompt to this LLM, use a tuple `(prompt, schema)`, e.g., `response_format=(prompt, WeatherResponse)`.
!!! Note "LLM post-processing"
Structured output requires an additional call to the LLM to format the response according to the schema.
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---
search:
boost: 2
tags:
- agent
hide:
- tags
---
# Context
Agents often require more than a list of messages to function effectively. They need **context**.
Context includes *any* data outside the message list that can shape agent behavior or tool execution. This can be:
- Information passed at runtime, like a `user_id` or API credentials.
- Internal state updated during a multi-step reasoning process.
- Persistent memory or facts from previous interactions.
LangGraph provides **three** primary ways to supply context:
| Type | Description | Mutable? | Lifetime |
|------------------------------------------------------------------------------|-----------------------------------------------|----------|-------------------------|
| [**Config**](#config-static-context) | data passed at the start of a run | ❌ | per run |
| [**State**](#state-mutable-context) | dynamic data that can change during execution | ✅ | per run or conversation |
| [**Long-term Memory (Store)**](#long-term-memory-cross-conversation-context) | data that can be shared between conversations | ✅ | across conversations |
You can use context to:
- Adjust the system prompt the model sees
- Feed tools with necessary inputs
- Track facts during an ongoing conversation
## Providing Runtime Context
Use this when you need to inject data into an agent at runtime.
### Config (static context)
Config is for immutable data like user metadata or API keys. Use
when you have values that don't change mid-run.
Specify configuration using a key called **"configurable"** which is reserved
for this purpose:
```python
agent.invoke(
{"messages": [{"role": "user", "content": "hi!"}]},
# highlight-next-line
config={"configurable": {"user_id": "user_123"}}
)
```
### State (mutable context)
State acts as short-term memory during a run. It holds dynamic data that can evolve during execution, such as values derived from tools or LLM outputs.
```python
class CustomState(AgentState):
# highlight-next-line
user_name: str
agent = create_react_agent(
# Other agent parameters...
# highlight-next-line
state_schema=CustomState,
)
agent.invoke({
"messages": "hi!",
"user_name": "Jane"
})
```
!!! tip "Turning on memory"
Please see the [memory guide](./memory.md) for more details on how to enable memory. This is a powerful feature that allows you to persist the agent's state across multiple invocations.
Otherwise, the state is scoped only to a single agent run.
### Long-Term Memory (cross-conversation context)
For context that spans *across* conversations or sessions, LangGraph allows access to **long-term memory** via a `store`. This can be used to read or update persistent facts (e.g., user profiles, preferences, prior interactions). For more, see the [Memory guide](./memory.md).
## Customizing Prompts with Context { #prompts }
Prompts define how the agent behaves. To incorporate runtime context, you can dynamically generate prompts based on the agent's state or config.
Common use cases:
- Personalization
- Role or goal customization
- Conditional behavior (e.g., user is admin)
=== "Using config"
```python
from langchain_core.messages import AnyMessage
from langchain_core.runnables import RunnableConfig
from langgraph.prebuilt import create_react_agent
from langgraph.prebuilt.chat_agent_executor import AgentState
def prompt(
state: AgentState,
# highlight-next-line
config: RunnableConfig,
) -> list[AnyMessage]:
# highlight-next-line
user_name = config["configurable"].get("user_name")
system_msg = f"You are a helpful assistant. User's name is {user_name}"
return [{"role": "system", "content": system_msg}] + state["messages"]
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
# highlight-next-line
prompt=prompt
)
agent.invoke(
...,
# highlight-next-line
config={"configurable": {"user_name": "John Smith"}}
)
```
=== "Using state"
```python
from langchain_core.messages import AnyMessage
from langchain_core.runnables import RunnableConfig
from langgraph.prebuilt import create_react_agent
from langgraph.prebuilt.chat_agent_executor import AgentState
class CustomState(AgentState):
# highlight-next-line
user_name: str
def prompt(
# highlight-next-line
state: CustomState
) -> list[AnyMessage]:
# highlight-next-line
user_name = state["user_name"]
system_msg = f"You are a helpful assistant. User's name is {user_name}"
return [{"role": "system", "content": system_msg}] + state["messages"]
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[...],
# highlight-next-line
state_schema=CustomState,
# highlight-next-line
prompt=prompt
)
agent.invoke({
"messages": "hi!",
# highlight-next-line
"user_name": "John Smith"
})
```
## Accessing Context in Tools { #tools }
Tools can access context through special parameter **annotations**.
* Use `RunnableConfig` for config access
* Use `Annotated[StateSchema, InjectedState]` for agent state
!!! tip
These annotations prevent LLMs from attempting to fill in the values. These parameters will be **hidden** from the LLM.
=== "Using config"
```python
def get_user_info(
# highlight-next-line
config: RunnableConfig,
) -> str:
"""Look up user info."""
# highlight-next-line
user_id = config["configurable"].get("user_id")
return "User is John Smith" if user_id == "user_123" else "Unknown user"
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_user_info],
)
agent.invoke(
{"messages": [{"role": "user", "content": "look up user information"}]},
# highlight-next-line
config={"configurable": {"user_id": "user_123"}}
)
```
=== "Using State"
```python
from typing import Annotated
from langgraph.prebuilt import InjectedState
class CustomState(AgentState):
# highlight-next-line
user_id: str
def get_user_info(
# highlight-next-line
state: Annotated[CustomState, InjectedState]
) -> str:
"""Look up user info."""
# highlight-next-line
user_id = state["user_id"]
return "User is John Smith" if user_id == "user_123" else "Unknown user"
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_user_info],
# highlight-next-line
state_schema=CustomState,
)
agent.invoke({
"messages": "look up user information",
# highlight-next-line
"user_id": "user_123"
})
```
### Update Context from Tools
Tools can update agent's context (state and long-term memory) during execution. This is useful for persisting intermediate results or making information accessible to subsequent tools or prompts. See [Memory](./memory.md#read-short-term) guide for more information.
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---
search:
boost: 2
tags:
- agent
hide:
- tags
---
# Deployment
To deploy your LangGraph agent, create and configure a LangGraph app. This setup supports both local development and production deployments.
Features:
* 🖥️ Local server for development
* 🧩 Studio Web UI for visual debugging
* ☁️ Cloud and 🔧 self-hosted deployment options
* 📊 LangSmith integration for tracing and observability
!!! info "Requirements"
- ✅ You **must** have a [LangSmith account](https://www.langchain.com/langsmith). You can sign up for **free** and get started with the free tier.
## Create a LangGraph app
```bash
pip install -U "langgraph-cli[inmem]"
langgraph new path/to/your/app --template new-langgraph-project-python
```
This will create an empty LangGraph project. You can modify it by replacing the code in `src/agent/graph.py` with your agent code. For example:
```python
from langgraph.prebuilt import create_react_agent
def get_weather(city: str) -> str:
"""Get weather for a given city."""
return f"It's always sunny in {city}!"
graph = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
prompt="You are a helpful assistant"
)
```
### Install dependencies
In the root of your new LangGraph app, install the dependencies in `edit` mode so your local changes are used by the server:
```shell
pip install -e .
```
### Create an `.env` file
You will find a `.env.example` in the root of your new LangGraph app. Create
a `.env` file in the root of your new LangGraph app and copy the contents of the `.env.example` file into it, filling in the necessary API keys:
```bash
LANGSMITH_API_KEY=lsv2...
ANTHROPIC_API_KEY=sk-
```
## Launch LangGraph server locally
```shell
langgraph dev
```
This will start up the LangGraph API server locally. If this runs successfully, you should see something like:
> Ready!
>
> - API: [http://localhost:2024](http://localhost:2024/)
>
> - Docs: http://localhost:2024/docs
>
> - LangGraph Studio Web UI: https://smith.langchain.com/studio/?baseUrl=http://127.0.0.1:2024
See this [tutorial](https://langchain-ai.github.io/langgraph/tutorials/langgraph-platform/local-server/) to learn more about running LangGraph app locally.
## LangGraph Studio Web UI
LangGraph Studio Web is a specialized UI that you can connect to LangGraph API server to enable visualization, interaction, and debugging of your application locally. Test your graph in the LangGraph Studio Web UI by visiting the URL provided in the output of the `langgraph dev` command.
> - LangGraph Studio Web UI: https://smith.langchain.com/studio/?baseUrl=http://127.0.0.1:2024
## Deployment
Once your LangGraph app is running locally, you can deploy it using LangGraph Cloud or self-hosted options. Refer to the [deployment options guide](../tutorials/deployment.md) for detailed instructions on all supported deployment models.
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---
search:
boost: 2
tags:
- agent
hide:
- tags
---
# Evals
To evaluate your agent's performance you can use `LangSmith` [evaluations](https://docs.smith.langchain.com/evaluation). You would need to first define an evaluator function to judge the results from an agent, such as final outputs or trajectory. Depending on your evaluation technique, this may or may not involve a reference output:
```python
def evaluator(*, outputs: dict, reference_outputs: dict):
# compare agent outputs against reference outputs
output_messages = outputs["messages"]
reference_messages = reference["messages"]
score = compare_messages(output_messages, reference_messages)
return {"key": "evaluator_score", "score": score}
```
To get started, you can use prebuilt evaluators from `AgentEvals` package:
```bash
pip install -U agentevals
```
## Create evaluator
A common way to evaluate agent performance is by comparing its trajectory (the order in which it calls its tools) against a reference trajectory:
```python
import json
# highlight-next-line
from agentevals.trajectory.match import create_trajectory_match_evaluator
outputs = [
{
"role": "assistant",
"tool_calls": [
{
"function": {
"name": "get_weather",
"arguments": json.dumps({"city": "san francisco"}),
}
},
{
"function": {
"name": "get_directions",
"arguments": json.dumps({"destination": "presidio"}),
}
}
],
}
]
reference_outputs = [
{
"role": "assistant",
"tool_calls": [
{
"function": {
"name": "get_weather",
"arguments": json.dumps({"city": "san francisco"}),
}
},
],
}
]
# Create the evaluator
evaluator = create_trajectory_match_evaluator(
# highlight-next-line
trajectory_match_mode="superset", # (1)!
)
# Run the evaluator
result = evaluator(
outputs=outputs, reference_outputs=reference_outputs
)
```
1. Specify how the trajectories will be compared. `superset` will accept output trajectory as valid if it's a superset of the reference one. Other options include: [strict](https://github.com/langchain-ai/agentevals?tab=readme-ov-file#strict-match), [unordered](https://github.com/langchain-ai/agentevals?tab=readme-ov-file#unordered-match) and [subset](https://github.com/langchain-ai/agentevals?tab=readme-ov-file#subset-and-superset-match)
As a next step, learn more about how to [customize trajectory match evaluator](https://github.com/langchain-ai/agentevals?tab=readme-ov-file#agent-trajectory-match).
### LLM-as-a-judge
You can use LLM-as-a-judge evaluator that uses an LLM to compare the trajectory against the reference outputs and output a score:
```python
import json
from agentevals.trajectory.llm import (
# highlight-next-line
create_trajectory_llm_as_judge,
TRAJECTORY_ACCURACY_PROMPT_WITH_REFERENCE
)
evaluator = create_trajectory_llm_as_judge(
prompt=TRAJECTORY_ACCURACY_PROMPT_WITH_REFERENCE,
model="openai:o3-mini"
)
```
## Run evaluator
To run an evaluator, you will first need to create a [LangSmith dataset](https://docs.smith.langchain.com/evaluation/concepts#datasets). To use the prebuilt AgentEvals evaluators, you will need a dataset with the following schema:
- **input**: `{"messages": [...]}` input messages to call the agent with.
- **output**: `{"messages": [...]}` expected message history in the agent output. For trajectory evaluation, you can choose to keep only assistant messages.
```python
from langsmith import Client
from langgraph.prebuilt import create_react_agent
from agentevals.trajectory.match import create_trajectory_match_evaluator
client = Client()
agent = create_react_agent(...)
evaluator = create_trajectory_match_evaluator(...)
experiment_results = client.evaluate(
lambda inputs: agent.invoke(inputs),
# replace with your dataset name
data="<Name of your dataset>",
evaluators=[evaluator]
)
```
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---
search:
boost: 2
tags:
- human-in-the-loop
- hil
- agent
hide:
- tags
---
# Human-in-the-loop
To review, edit and approve tool calls in an agent you can use LangGraph's built-in [Human-In-the-Loop (HIL)](../concepts/human_in_the_loop.md) features, specifically the [`interrupt()`][langgraph.types.interrupt] primitive.
LangGraph allows you to pause execution **indefinitely** — for minutes, hours, or even days—until human input is received.
This is possible because the agent state is **checkpointed into a database**, which allows the system to persist execution context and later resume the workflow, continuing from where it left off.
For a deeper dive into the **human-in-the-loop** concept, see the [concept guide](../concepts/human_in_the_loop.md).
<figure markdown="1">
![image](../concepts/img/human_in_the_loop/tool-call-review.png){: style="max-height:400px"}
<figcaption>
A human can review and edit the output from the agent before proceeding. This is particularly critical in applications where the tool calls requested may be sensitive or require human oversight.
</figcaption>
</figure>
## Review tool calls
To add a human approval step to a tool:
1. Use `interrupt()` in the tool to pause execution.
2. Resume with a `Command(resume=...)` to continue based on human input.
```python
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.types import interrupt
from langgraph.prebuilt import create_react_agent
# An example of a sensitive tool that requires human review / approval
def book_hotel(hotel_name: str):
"""Book a hotel"""
# highlight-next-line
response = interrupt( # (1)!
f"Trying to call `book_hotel` with args {{'hotel_name': {hotel_name}}}. "
"Please approve or suggest edits."
)
if response["type"] == "accept":
pass
elif response["type"] == "edit":
hotel_name = response["args"]["hotel_name"]
else:
raise ValueError(f"Unknown response type: {response['type']}")
return f"Successfully booked a stay at {hotel_name}."
# highlight-next-line
checkpointer = InMemorySaver() # (2)!
agent = create_react_agent(
model="anthropic:claude-3-5-sonnet-latest",
tools=[book_hotel],
# highlight-next-line
checkpointer=checkpointer, # (3)!
)
```
1. The [`interrupt` function][langgraph.types.interrupt] pauses the agent graph at a specific node. In this case, we call `interrupt()` at the beginning of the tool function, which pauses the graph at the node that executes the tool. The information inside `interrupt()` (e.g., tool calls) can be presented to a human, and the graph can be resumed with the user input (tool call approval, edit or feedback).
2. The `InMemorySaver` is used to store the agent state at every step in the tool calling loop. This enables [short-term memory](./memory.md#short-term-memory) and [human-in-the-loop](./human-in-the-loop.md) capabilities. In this example, we use `InMemorySaver` to store the agent state in memory. In a production application, the agent state will be stored in a database.
3. Initialize the agent with the `checkpointer`.
Run the agent with the `stream()` method, passing the `config` object to specify the thread ID. This allows the agent to resume the same conversation on future invocations.
```python
config = {
"configurable": {
# highlight-next-line
"thread_id": "1"
}
}
for chunk in agent.stream(
{"messages": [{"role": "user", "content": "book a stay at McKittrick hotel"}]},
# highlight-next-line
config
):
print(chunk)
print("\n")
```
> You should see that the agent runs until it reaches the `interrupt()` call, at which point it pauses and waits for human input.
Resume the agent with a `Command(resume=...)` to continue based on human input.
```python
from langgraph.types import Command
for chunk in agent.stream(
# highlight-next-line
Command(resume={"type": "accept"}), # (1)!
# Command(resume={"type": "edit", "args": {"hotel_name": "McKittrick Hotel"}}),
config
):
print(chunk)
print("\n")
```
1. The [`interrupt` function][langgraph.types.interrupt] is used in conjunction with the [`Command`](../reference/types.md#langgraph.types.Command) object to resume the graph with a value provided by the human.
## Using with Agent Inbox
You can create a wrapper to add interrupts to *any* tool.
The example below provides a reference implementation compatible with [Agent Inbox UI](https://github.com/langchain-ai/agent-inbox) and [Agent Chat UI](https://github.com/langchain-ai/agent-chat-ui).
```python title="Wrapper that adds human-in-the-loop to any tool"
from typing import Callable
from langchain_core.tools import BaseTool, tool as create_tool
from langchain_core.runnables import RunnableConfig
from langgraph.types import interrupt
from langgraph.prebuilt.interrupt import HumanInterruptConfig, HumanInterrupt
def add_human_in_the_loop(
tool: Callable | BaseTool,
*,
interrupt_config: HumanInterruptConfig = None,
) -> BaseTool:
"""Wrap a tool to support human-in-the-loop review."""
if not isinstance(tool, BaseTool):
tool = create_tool(tool)
if interrupt_config is None:
interrupt_config = {
"allow_accept": True,
"allow_edit": True,
"allow_respond": True,
}
@create_tool( # (1)!
tool.name,
description=tool.description,
args_schema=tool.args_schema
)
def call_tool_with_interrupt(config: RunnableConfig, **tool_input):
request: HumanInterrupt = {
"action_request": {
"action": tool.name,
"args": tool_input
},
"config": interrupt_config,
"description": "Please review the tool call"
}
# highlight-next-line
response = interrupt([request])[0] # (2)!
# approve the tool call
if response["type"] == "accept":
tool_response = tool.invoke(tool_input, config)
# update tool call args
elif response["type"] == "edit":
tool_input = response["args"]["args"]
tool_response = tool.invoke(tool_input, config)
# respond to the LLM with user feedback
elif response["type"] == "response":
user_feedback = response["args"]
tool_response = user_feedback
else:
raise ValueError(f"Unsupported interrupt response type: {response['type']}")
return tool_response
return call_tool_with_interrupt
```
1. This wrapper creates a new tool that calls `interrupt()` **before** executing the wrapped tool.
2. `interrupt()` is using special input and output format that's expected by [Agent Inbox UI](https://github.com/langchain-ai/agent-inbox):
- a list of [`HumanInterrupt`][langgraph.prebuilt.interrupt.HumanInterrupt] objects is sent to `AgentInbox` render interrupt information to the end user
- resume value is provided by `AgentInbox` as a list (i.e., `Command(resume=[...])`)
You can use the `add_human_in_the_loop` wrapper to add `interrupt()` to any tool without having to add it *inside* the tool:
```python
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.prebuilt import create_react_agent
# highlight-next-line
checkpointer = InMemorySaver()
def book_hotel(hotel_name: str):
"""Book a hotel"""
return f"Successfully booked a stay at {hotel_name}."
agent = create_react_agent(
model="anthropic:claude-3-5-sonnet-latest",
tools=[
# highlight-next-line
add_human_in_the_loop(book_hotel), # (1)!
],
# highlight-next-line
checkpointer=checkpointer,
)
config = {"configurable": {"thread_id": "1"}}
# Run the agent
for chunk in agent.stream(
{"messages": [{"role": "user", "content": "book a stay at McKittrick hotel"}]},
# highlight-next-line
config
):
print(chunk)
print("\n")
```
1. The `add_human_in_the_loop` wrapper is used to add `interrupt()` to the tool. This allows the agent to pause execution and wait for human input before proceeding with the tool call.
> You should see that the agent runs until it reaches the `interrupt()` call,
> at which point it pauses and waits for human input.
Resume the agent with a `Command(resume=...)` to continue based on human input.
```python
from langgraph.types import Command
for chunk in agent.stream(
# highlight-next-line
Command(resume=[{"type": "accept"}]),
# Command(resume=[{"type": "edit", "args": {"args": {"hotel_name": "McKittrick Hotel"}}}]),
config
):
print(chunk)
print("\n")
```
## Additional resources
* [Human-in-the-loop in LangGraph](../concepts/human_in_the_loop.md)
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- agent
hide:
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---
# MCP Integration
[Model Context Protocol (MCP)](https://modelcontextprotocol.io/introduction) is an open protocol that standardizes how applications provide tools and context to language models. LangGraph agents can use tools defined on MCP servers through the `langchain-mcp-adapters` library.
![MCP](./assets/mcp.png)
Install the `langchain-mcp-adapters` library to use MCP tools in LangGraph:
```bash
pip install langchain-mcp-adapters
```
## Use MCP tools
The `langchain-mcp-adapters` package enables agents to use tools defined across one or more MCP servers.
```python title="Agent using tools defined on MCP servers"
# highlight-next-line
from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.prebuilt import create_react_agent
# highlight-next-line
async with MultiServerMCPClient(
{
"math": {
"command": "python",
# Replace with absolute path to your math_server.py file
"args": ["/path/to/math_server.py"],
"transport": "stdio",
},
"weather": {
# Ensure your start your weather server on port 8000
"url": "http://localhost:8000/sse",
"transport": "sse",
}
}
) as client:
agent = create_react_agent(
"anthropic:claude-3-7-sonnet-latest",
# highlight-next-line
client.get_tools()
)
math_response = await agent.ainvoke(
{"messages": [{"role": "user", "content": "what's (3 + 5) x 12?"}]}
)
weather_response = await agent.ainvoke(
{"messages": [{"role": "user", "content": "what is the weather in nyc?"}]}
)
```
## Custom MCP servers
To create your own MCP servers, you can use the `mcp` library. This library provides a simple way to define tools and run them as servers.
Install the MCP library:
```bash
pip install mcp
```
Use the following reference implementations to test your agent with MCP tool servers.
```python title="Example Math Server (stdio transport)"
from mcp.server.fastmcp import FastMCP
mcp = FastMCP("Math")
@mcp.tool()
def add(a: int, b: int) -> int:
"""Add two numbers"""
return a + b
@mcp.tool()
def multiply(a: int, b: int) -> int:
"""Multiply two numbers"""
return a * b
if __name__ == "__main__":
mcp.run(transport="stdio")
```
```python title="Example Weather Server (SSE transport)"
from mcp.server.fastmcp import FastMCP
mcp = FastMCP("Weather")
@mcp.tool()
async def get_weather(location: str) -> str:
"""Get weather for location."""
return "It's always sunny in New York"
if __name__ == "__main__":
mcp.run(transport="sse")
```
## Additional resources
- [MCP documentation](https://modelcontextprotocol.io/introduction)
- [MCP Transport documentation](https://modelcontextprotocol.io/docs/concepts/transports)
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# Memory
LangGraph supports two types of memory essential for building conversational agents:
- **[Short-term memory](#short-term-memory)**: Tracks the ongoing conversation by maintaining message history within a session.
- **[Long-term memory](#long-term-memory)**: Stores user-specific or application-level data across sessions.
This guide demonstrates how to use both memory types with agents in LangGraph. For a deeper
understanding of memory concepts, refer to the [LangGraph memory documentation](../concepts/memory.md).
<figure markdown="1">
![image](./assets/memory.png){: style="max-height:400px"}
<figcaption>Both <strong>short-term</strong> and <strong>long-term</strong> memory require persistent storage to maintain continuity across LLM interactions. In production environments, this data is typically stored in a database.</figcaption>
</figure>
!!! note "Terminology"
In LangGraph:
- *Short-term memory* is also referred to as **thread-level memory**.
- *Long-term memory* is also called **cross-thread memory**.
A [thread](../concepts/persistence.md#threads) represents a sequence of related runs
grouped by the same `thread_id`.
## Short-term memory
Short-term memory enables agents to track multi-turn conversations. To use it, you must:
1. Provide a `checkpointer` when creating the agent. The `checkpointer` enables [persistence](../concepts/persistence.md) of the agent's state.
2. Supply a `thread_id` in the config when running the agent. The `thread_id` is a unique identifier for the conversation session.
```python
from langgraph.prebuilt import create_react_agent
from langgraph.checkpoint.memory import InMemorySaver
# highlight-next-line
checkpointer = InMemorySaver() # (1)!
def get_weather(city: str) -> str:
"""Get weather for a given city."""
return f"It's always sunny in {city}!"
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
# highlight-next-line
checkpointer=checkpointer # (2)!
)
# Run the agent
config = {
"configurable": {
# highlight-next-line
"thread_id": "1" # (3)!
}
}
sf_response = agent.invoke(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
# highlight-next-line
config
)
# Continue the conversation using the same thread_id
ny_response = agent.invoke(
{"messages": [{"role": "user", "content": "what about new york?"}]},
# highlight-next-line
config # (4)!
)
```
1. The `InMemorySaver` is a checkpointer that stores the agent's state in memory. In a production setting, you would typically use a database or other persistent storage. Please review the [checkpointer documentation](../reference/checkpoints.md) for more options. If you're deploying with **LangGraph Platform**, the platform will provide a production-ready checkpointer for you.
2. The `checkpointer` is passed to the agent. This enables the agent to persist its state across invocations. Please note that
3. A unique `thread_id` is provided in the config. This ID is used to identify the conversation session. The value is controlled by the user and can be any string.
4. The agent will continue the conversation using the same `thread_id`. This will allow the agent to infer that the user is asking specifically about the **weather** in New York.
When the agent is invoked the second time with the same `thread_id`, the original message history from the first conversation is automatically included, allowing the agent to infer that the user is asking specifically about the **weather** in New York.
!!! Note "LangGraph Platform providers a production-ready checkpointer"
If you're using [LangGraph Platform](./deployment.md), during deployment your checkpointer will be automatically configured to use a production-ready database.
### Manage message history
Long conversations can exceed the LLM's context window. Common solutions are:
* [Summarization](#summarize-message-history): Maintain a running summary of the conversation
* [Trimming](#trim-message-history): Remove first or last N messages in the history
This allows the agent to keep track of the conversation without exceeding the LLM's context window.
To manage message history, specify `pre_model_hook` — a function ([node](../concepts/low_level.md#nodes)) that will always run before calling the language model.
#### Summarize message history
<figure markdown="1">
![image](./assets/summary.png){: style="max-height:400px"}
<figcaption>Long conversations can exceed the LLM's context window. A common solution is to maintain a running summary of the conversation. This allows the agent to keep track of the conversation without exceeding the LLM's context window.
</figcaption>
</figure>
To summarize message history, you can use [`pre_model_hook`][langgraph.prebuilt.chat_agent_executor.create_react_agent] with a prebuilt [`SummarizationNode`](https://langchain-ai.github.io/langmem/reference/short_term/#langmem.short_term.SummarizationNode):
```python
from langchain_anthropic import ChatAnthropic
from langmem.short_term import SummarizationNode
from langchain_core.messages.utils import count_tokens_approximately
from langgraph.prebuilt import create_react_agent
from langgraph.prebuilt.chat_agent_executor import AgentState
from langgraph.checkpoint.memory import InMemorySaver
from typing import Any
model = ChatAnthropic(model="claude-3-7-sonnet-latest")
summarization_node = SummarizationNode( # (1)!
token_counter=count_tokens_approximately,
model=model,
max_tokens=384,
max_summary_tokens=128,
output_messages_key="llm_input_messages",
)
class State(AgentState):
# NOTE: we're adding this key to keep track of previous summary information
# to make sure we're not summarizing on every LLM call
# highlight-next-line
context: dict[str, Any] # (2)!
checkpointer = InMemorySaver() # (3)!
agent = create_react_agent(
model=model,
tools=tools,
# highlight-next-line
pre_model_hook=summarization_node, # (4)!
# highlight-next-line
state_schema=State, # (5)!
checkpointer=checkpointer,
)
```
1. The `InMemorySaver` is a checkpointer that stores the agent's state in memory. In a production setting, you would typically use a database or other persistent storage. Please review the [checkpointer documentation](../reference/checkpoints.md) for more options. If you're deploying with **LangGraph Platform**, the platform will provide a production-ready checkpointer for you.
2. The `context` key is added to the agent's state. The key contains book-keeping information for the summarization node. It is used to keep track of the last summary information and ensure that the agent doesn't summarize on every LLM call, which can be inefficient.
3. The `checkpointer` is passed to the agent. This enables the agent to persist its state across invocations.
4. The `pre_model_hook` is set to the `SummarizationNode`. This node will summarize the message history before sending it to the LLM. The summarization node will automatically handle the summarization process and update the agent's state with the new summary. You can replace this with a custom implementation if you prefer. Please see the [create_react_agent][langgraph.prebuilt.chat_agent_executor.create_react_agent] API reference for more details.
5. The `state_schema` is set to the `State` class, which is the custom state that contains an extra `context` key.
#### Trim message history
To trim message history, you can use [`pre_model_hook`][langgraph.prebuilt.chat_agent_executor.create_react_agent] with [`trim_messages`](https://python.langchain.com/api_reference/core/messages/langchain_core.messages.utils.trim_messages.html) function:
```python
# highlight-next-line
from langchain_core.messages.utils import (
# highlight-next-line
trim_messages,
# highlight-next-line
count_tokens_approximately
# highlight-next-line
)
from langgraph.prebuilt import create_react_agent
# This function will be called every time before the node that calls LLM
def pre_model_hook(state):
trimmed_messages = trim_messages(
state["messages"],
strategy="last",
token_counter=count_tokens_approximately,
max_tokens=384,
start_on="human",
end_on=("human", "tool"),
)
# highlight-next-line
return {"llm_input_messages": trimmed_messages}
checkpointer = InMemorySaver()
agent = create_react_agent(
model,
tools,
# highlight-next-line
pre_model_hook=pre_model_hook,
checkpointer=checkpointer,
)
```
To learn more about using `pre_model_hook` for managing message history, see this [how-to guide](../how-tos/create-react-agent-manage-message-history.ipynb)
### Read in tools { #read-short-term }
LangGraph allows agent to access its short-term memory (state) inside the tools.
```python
from typing import Annotated
from langgraph.prebuilt import InjectedState, create_react_agent
class CustomState(AgentState):
# highlight-next-line
user_id: str
def get_user_info(
# highlight-next-line
state: Annotated[CustomState, InjectedState]
) -> str:
"""Look up user info."""
# highlight-next-line
user_id = state["user_id"]
return "User is John Smith" if user_id == "user_123" else "Unknown user"
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_user_info],
# highlight-next-line
state_schema=CustomState,
)
agent.invoke({
"messages": "look up user information",
# highlight-next-line
"user_id": "user_123"
})
```
See the [Context](./context.md#__tabbed_2_2) guide for more information.
### Write from tools { #write-short-term }
To modify the agent's short-term memory (state) during execution, you can return state updates directly from the tools. This is useful for persisting intermediate results or making information accessible to subsequent tools or prompts.
```python
from typing import Annotated
from langchain_core.tools import InjectedToolCallId
from langchain_core.runnables import RunnableConfig
from langchain_core.messages import ToolMessage
from langgraph.prebuilt import InjectedState, create_react_agent
from langgraph.prebuilt.chat_agent_executor import AgentState
from langgraph.types import Command
class CustomState(AgentState):
# highlight-next-line
user_name: str
def update_user_info(
tool_call_id: Annotated[str, InjectedToolCallId],
config: RunnableConfig
) -> Command:
"""Look up and update user info."""
user_id = config["configurable"].get("user_id")
name = "John Smith" if user_id == "user_123" else "Unknown user"
# highlight-next-line
return Command(update={
# highlight-next-line
"user_name": name,
# update the message history
"messages": [
ToolMessage(
"Successfully looked up user information",
tool_call_id=tool_call_id
)
]
})
def greet(
# highlight-next-line
state: Annotated[CustomState, InjectedState]
) -> str:
"""Use this to greet the user once you found their info."""
user_name = state["user_name"]
return f"Hello {user_name}!"
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[update_user_info, greet],
# highlight-next-line
state_schema=CustomState
)
agent.invoke(
{"messages": [{"role": "user", "content": "greet the user"}]},
# highlight-next-line
config={"configurable": {"user_id": "user_123"}}
)
```
For more details, see [how to update state from tools](../how-tos/update-state-from-tools.ipynb).
## Long-term memory
Use long-term memory to store user-specific or application-specific data across conversations. This is useful for applications like chatbots, where you want to remember user preferences or other information.
To use long-term memory, you need to:
1. [Configure a store](../how-tos/cross-thread-persistence.ipynb) to persist data across invocations.
2. Use the [`get_store`][langgraph.config.get_store] function to access the store from within tools or prompts.
### Read { #read-long-term }
```python title="A tool the agent can use to look up user information"
from langchain_core.runnables import RunnableConfig
from langgraph.config import get_store
from langgraph.prebuilt import create_react_agent
from langgraph.store.memory import InMemoryStore
# highlight-next-line
store = InMemoryStore() # (1)!
# highlight-next-line
store.put( # (2)!
("users",), # (3)!
"user_123", # (4)!
{
"name": "John Smith",
"language": "English",
} # (5)!
)
def get_user_info(config: RunnableConfig) -> str:
"""Look up user info."""
# Same as that provided to `create_react_agent`
# highlight-next-line
store = get_store() # (6)!
user_id = config["configurable"].get("user_id")
# highlight-next-line
user_info = store.get(("users",), user_id) # (7)!
return str(user_info.value) if user_info else "Unknown user"
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_user_info],
# highlight-next-line
store=store # (8)!
)
# Run the agent
agent.invoke(
{"messages": [{"role": "user", "content": "look up user information"}]},
# highlight-next-line
config={"configurable": {"user_id": "user_123"}}
)
```
1. The `InMemoryStore` is a store that stores data in memory. In a production setting, you would typically use a database or other persistent storage. Please review the [store documentation](../reference/store.md) for more options. If you're deploying with **LangGraph Platform**, the platform will provide a production-ready store for you.
2. For this example, we write some sample data to the store using the `put` method. Please see the [BaseStore.put][langgraph.store.base.BaseStore.put] API reference for more details.
3. The first argument is the namespace. This is used to group related data together. In this case, we are using the `users` namespace to group user data.
4. A key within the namespace. This example uses a user ID for the key.
5. The data that we want to store for the given user.
6. The `get_store` function is used to access the store. You can call it from anywhere in your code, including tools and prompts. This function returns the store that was passed to the agent when it was created.
7. The `get` method is used to retrieve data from the store. The first argument is the namespace, and the second argument is the key. This will return a `StoreValue` object, which contains the value and metadata about the value.
8. The `store` is passed to the agent. This enables the agent to access the store when running tools. You can also use the `get_store` function to access the store from anywhere in your code.
### Write { #write-long-term }
```python title="Example of a tool that updates user information"
from typing_extensions import TypedDict
from langgraph.config import get_store
from langgraph.prebuilt import create_react_agent
from langgraph.store.memory import InMemoryStore
store = InMemoryStore() # (1)!
class UserInfo(TypedDict): # (2)!
name: str
def save_user_info(user_info: UserInfo, config: RunnableConfig) -> str: # (3)!
"""Save user info."""
# Same as that provided to `create_react_agent`
# highlight-next-line
store = get_store() # (4)!
user_id = config["configurable"].get("user_id")
# highlight-next-line
store.put(("users",), user_id, user_info) # (5)!
return "Successfully saved user info."
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[save_user_info],
# highlight-next-line
store=store
)
# Run the agent
agent.invoke(
{"messages": [{"role": "user", "content": "My name is John Smith"}]},
# highlight-next-line
config={"configurable": {"user_id": "user_123"}} # (6)!
)
# You can access the store directly to get the value
store.get(("users",), "user_123").value
```
1. The `InMemoryStore` is a store that stores data in memory. In a production setting, you would typically use a database or other persistent storage. Please review the [store documentation](../reference/store.md) for more options. If you're deploying with **LangGraph Platform**, the platform will provide a production-ready store for you.
2. The `UserInfo` class is a `TypedDict` that defines the structure of the user information. The LLM will use this to format the response according to the schema.
3. The `save_user_info` function is a tool that allows an agent to update user information. This could be useful for a chat application where the user wants to update their profile information.
4. The `get_store` function is used to access the store. You can call it from anywhere in your code, including tools and prompts. This function returns the store that was passed to the agent when it was created.
5. The `put` method is used to store data in the store. The first argument is the namespace, and the second argument is the key. This will store the user information in the store.
6. The `user_id` is passed in the config. This is used to identify the user whose information is being updated.
### Semantic search
LangGraph also allows you to [search](https://langchain-ai.github.io/langgraph/how-tos/memory/semantic-search/#using-in-create-react-agent) for items in long-term memory by semantic similarity.
### Prebuilt memory tools
**LangMem** is a LangChain-maintained library that offers tools for managing long-term memories in your agent. See the [LangMem documentation](https://langchain-ai.github.io/langmem/) for usage examples.
## Additional resources
* [Memory in LangGraph](../concepts/memory.md)
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---
search:
boost: 2
tags:
- anthropic
- openai
- agent
hide:
- tags
---
# Models
This page describes how to configure the chat model used by an agent.
## Tool calling support
To enable tool-calling agents, the underlying LLM must support [tool calling](https://python.langchain.com/docs/concepts/tool_calling/).
Compatible models can be found in the [LangChain integrations directory](https://python.langchain.com/docs/integrations/chat/).
## Specifying a model by name
You can configure an agent with a model name string:
```python
from langgraph.prebuilt import create_react_agent
agent = create_react_agent(
# highlight-next-line
model="anthropic:claude-3-7-sonnet-latest",
# other parameters
)
```
## Using `init_chat_model`
The [`init_chat_model`](https://python.langchain.com/docs/how_to/chat_models_universal_init/) utility simplifies model initialization with configurable parameters:
```python
from langchain.chat_models import init_chat_model
model = init_chat_model(
"anthropic:claude-3-7-sonnet-latest",
temperature=0,
max_tokens=2048
)
```
Refer to the [API reference](https://python.langchain.com/api_reference/langchain/chat_models/langchain.chat_models.base.init_chat_model.html) for advanced options.
## Using provider-specific LLMs
If a model provider is not available via `init_chat_model`, you can instantiate the provider's model class directly. The model must implement the [BaseChatModel interface](https://python.langchain.com/api_reference/core/language_models/langchain_core.language_models.chat_models.BaseChatModel.html) and support tool calling:
```python
from langchain_anthropic import ChatAnthropic
from langgraph.prebuilt import create_react_agent
model = ChatAnthropic(
model="claude-3-7-sonnet-latest",
temperature=0,
max_tokens=2048
)
agent = create_react_agent(
# highlight-next-line
model=model,
# other parameters
)
```
!!! note "Illustrative example"
The example above uses `ChatAnthropic`, which is already supported by `init_chat_model`. This pattern is shown to illustrate how to manually instantiate a model not available through init_chat_model.
## Disable streaming
To disable streaming of the individual LLM tokens, set `disable_streaming=True` when initializing the model:
=== "`init_chat_model`"
```python
from langchain.chat_models import init_chat_model
model = init_chat_model(
"anthropic:claude-3-7-sonnet-latest",
# highlight-next-line
disable_streaming=True
)
```
=== "`ChatModel`"
```python
from langchain_anthropic import ChatAnthropic
model = ChatAnthropic(
model="claude-3-7-sonnet-latest",
# highlight-next-line
disable_streaming=True
)
```
Refer to the [API reference](https://python.langchain.com/api_reference/core/language_models/langchain_core.language_models.chat_models.BaseChatModel.html#langchain_core.language_models.chat_models.BaseChatModel.disable_streaming) for more information on `disable_streaming`
## Adding model fallbacks
You can add a fallback to a different model or a different LLM provider using `model.with_fallbacks([...])`:
=== "`init_chat_model`"
```python
from langchain.chat_models import init_chat_model
model_with_fallbacks = (
init_chat_model("anthropic:claude-3-5-haiku-latest")
# highlight-next-line
.with_fallbacks([
init_chat_model("openai:gpt-4.1-mini"),
])
)
```
=== "`ChatModel`"
```python
from langchain_anthropic import ChatAnthropic
from langchain_openai import ChatOpenAI
model_with_fallbacks = (
ChatAnthropic(model="claude-3-5-haiku-latest")
# highlight-next-line
.with_fallbacks([
ChatOpenAI(model="gpt-4.1-mini"),
])
)
```
See this [guide](https://python.langchain.com/docs/how_to/fallbacks/#fallback-to-better-model) for more information on model fallbacks.
## Additional resources
- [Model integration directory](https://python.langchain.com/docs/integrations/chat/)
- [Universal initialization with `init_chat_model`](https://python.langchain.com/docs/how_to/chat_models_universal_init/)
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---
search:
boost: 2
tags:
- agent
hide:
- tags
---
# Multi-agent
A single agent might struggle if it needs to specialize in multiple domains or manage many tools. To tackle this, you can break your agent into smaller, independent agents and composing them into a [multi-agent system](../concepts/multi_agent.md).
In multi-agent systems, agents need to communicate between each other. They do so via [handoffs](#handoffs) — a primitive that describes which agent to hand control to and the payload to send to that agent.
Two of the most popular multi-agent architectures are:
- [supervisor](#supervisor) — individual agents are coordinated by a central supervisor agent. The supervisor controls all communication flow and task delegation, making decisions about which agent to invoke based on the current context and task requirements.
- [swarm](#swarm) — agents dynamically hand off control to one another based on their specializations. The system remembers which agent was last active, ensuring that on subsequent interactions, the conversation resumes with that agent.
## Supervisor
![Supervisor](./assets/supervisor.png)
Use [`langgraph-supervisor`](https://github.com/langchain-ai/langgraph-supervisor-py) library to create a supervisor multi-agent system:
```bash
pip install langgraph-supervisor
```
```python
from langchain_openai import ChatOpenAI
from langgraph.prebuilt import create_react_agent
# highlight-next-line
from langgraph_supervisor import create_supervisor
def book_hotel(hotel_name: str):
"""Book a hotel"""
return f"Successfully booked a stay at {hotel_name}."
def book_flight(from_airport: str, to_airport: str):
"""Book a flight"""
return f"Successfully booked a flight from {from_airport} to {to_airport}."
flight_assistant = create_react_agent(
model="openai:gpt-4o",
tools=[book_flight],
prompt="You are a flight booking assistant",
# highlight-next-line
name="flight_assistant"
)
hotel_assistant = create_react_agent(
model="openai:gpt-4o",
tools=[book_hotel],
prompt="You are a hotel booking assistant",
# highlight-next-line
name="hotel_assistant"
)
# highlight-next-line
supervisor = create_supervisor(
agents=[flight_assistant, hotel_assistant],
model=ChatOpenAI(model="gpt-4o"),
prompt=(
"You manage a hotel booking assistant and a"
"flight booking assistant. Assign work to them."
)
).compile()
for chunk in supervisor.stream(
{
"messages": [
{
"role": "user",
"content": "book a flight from BOS to JFK and a stay at McKittrick Hotel"
}
]
}
):
print(chunk)
print("\n")
```
## Swarm
![Swarm](./assets/swarm.png)
Use [`langgraph-swarm`](https://github.com/langchain-ai/langgraph-swarm-py) library to create a swarm multi-agent system:
```bash
pip install langgraph-swarm
```
```python
from langgraph.prebuilt import create_react_agent
# highlight-next-line
from langgraph_swarm import create_swarm, create_handoff_tool
transfer_to_hotel_assistant = create_handoff_tool(
agent_name="hotel_assistant",
description="Transfer user to the hotel-booking assistant.",
)
transfer_to_flight_assistant = create_handoff_tool(
agent_name="flight_assistant",
description="Transfer user to the flight-booking assistant.",
)
flight_assistant = create_react_agent(
model="anthropic:claude-3-5-sonnet-latest",
# highlight-next-line
tools=[book_flight, transfer_to_hotel_assistant],
prompt="You are a flight booking assistant",
# highlight-next-line
name="flight_assistant"
)
hotel_assistant = create_react_agent(
model="anthropic:claude-3-5-sonnet-latest",
# highlight-next-line
tools=[book_hotel, transfer_to_flight_assistant],
prompt="You are a hotel booking assistant",
# highlight-next-line
name="hotel_assistant"
)
# highlight-next-line
swarm = create_swarm(
agents=[flight_assistant, hotel_assistant],
default_active_agent="flight_assistant"
).compile()
for chunk in swarm.stream(
{
"messages": [
{
"role": "user",
"content": "book a flight from BOS to JFK and a stay at McKittrick Hotel"
}
]
}
):
print(chunk)
print("\n")
```
## Handoffs
A common pattern in multi-agent interactions is **handoffs**, where one agent *hands off* control to another. Handoffs allow you to specify:
- **destination**: target agent to navigate to
- **payload**: information to pass to that agent
This is used both by `langgraph-supervisor` (supervisor hands off to individual agents) and `langgraph-swarm` (an individual agent can hand off to other agents).
To implement handoffs with `create_react_agent`, you need to:
1. Create a special tool that can transfer control to a different agent
```python
def transfer_to_bob():
"""Transfer to bob."""
return Command(
# name of the agent (node) to go to
# highlight-next-line
goto="bob",
# data to send to the agent
# highlight-next-line
update={"messages": [...]},
# indicate to LangGraph that we need to navigate to
# agent node in a parent graph
# highlight-next-line
graph=Command.PARENT,
)
```
1. Create individual agents that have access to handoff tools:
```python
flight_assistant = create_react_agent(
..., tools=[book_flight, transfer_to_hotel_assistant]
)
hotel_assistant = create_react_agent(
..., tools=[book_hotel, transfer_to_flight_assistant]
)
```
1. Define a parent graph that contains individual agents as nodes:
```python
from langgraph.graph import StateGraph, MessagesState
multi_agent_graph = (
StateGraph(MessagesState)
.add_node(flight_assistant)
.add_node(hotel_assistant)
...
)
```
Putting this together, here is how you can implement a simple multi-agent system with two agents — a flight booking assistant and a hotel booking assistant:
```python
from typing import Annotated
from langchain_core.tools import tool, InjectedToolCallId
from langgraph.prebuilt import create_react_agent, InjectedState
from langgraph.graph import StateGraph, START, MessagesState
from langgraph.types import Command
def create_handoff_tool(*, agent_name: str, description: str | None = None):
name = f"transfer_to_{agent_name}"
description = description or f"Transfer to {agent_name}"
@tool(name, description=description)
def handoff_tool(
# highlight-next-line
state: Annotated[MessagesState, InjectedState], # (1)!
# highlight-next-line
tool_call_id: Annotated[str, InjectedToolCallId],
) -> Command:
tool_message = {
"role": "tool",
"content": f"Successfully transferred to {agent_name}",
"name": name,
"tool_call_id": tool_call_id,
}
return Command( # (2)!
# highlight-next-line
goto=agent_name, # (3)!
# highlight-next-line
update={"messages": state["messages"] + [tool_message]}, # (4)!
# highlight-next-line
graph=Command.PARENT, # (5)!
)
return handoff_tool
# Handoffs
transfer_to_hotel_assistant = create_handoff_tool(
agent_name="hotel_assistant",
description="Transfer user to the hotel-booking assistant.",
)
transfer_to_flight_assistant = create_handoff_tool(
agent_name="flight_assistant",
description="Transfer user to the flight-booking assistant.",
)
# Simple agent tools
def book_hotel(hotel_name: str):
"""Book a hotel"""
return f"Successfully booked a stay at {hotel_name}."
def book_flight(from_airport: str, to_airport: str):
"""Book a flight"""
return f"Successfully booked a flight from {from_airport} to {to_airport}."
# Define agents
flight_assistant = create_react_agent(
model="anthropic:claude-3-5-sonnet-latest",
# highlight-next-line
tools=[book_flight, transfer_to_hotel_assistant],
prompt="You are a flight booking assistant",
# highlight-next-line
name="flight_assistant"
)
hotel_assistant = create_react_agent(
model="anthropic:claude-3-5-sonnet-latest",
# highlight-next-line
tools=[book_hotel, transfer_to_flight_assistant],
prompt="You are a hotel booking assistant",
# highlight-next-line
name="hotel_assistant"
)
# Define multi-agent graph
multi_agent_graph = (
StateGraph(MessagesState)
.add_node(flight_assistant)
.add_node(hotel_assistant)
.add_edge(START, "flight_assistant")
.compile()
)
# Run the multi-agent graph
for chunk in multi_agent_graph.stream(
{
"messages": [
{
"role": "user",
"content": "book a flight from BOS to JFK and a stay at McKittrick Hotel"
}
]
}
):
print(chunk)
print("\n")
```
1. Access agent's state
2. The `Command` primitive allows specifying a state update and a node transition as a single operation, making it useful for implementing handoffs.
3. Name of the agent or node to hand off to.
4. Take the agent's messages and **add** them to the parent's **state** as part of the handoff. The next agent will see the parent state.
5. Indicate to LangGraph that we need to navigate to agent node in a **parent** multi-agent graph.
!!! Note
This handoff implementation assumes that:
- each agent receives overall message history (across all agents) in the multi-agent system as its input
- each agent outputs its internal messages history to the overall message history of the multi-agent system
Check out LangGraph [supervisor](https://github.com/langchain-ai/langgraph-supervisor-py#customizing-handoff-tools) and [swarm](https://github.com/langchain-ai/langgraph-swarm-py#customizing-handoff-tools) documentation to learn how to customize handoffs.
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---
title: Overview
search:
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tags:
- agent
hide:
- tags
---
# Agent development with LangGraph
**LangGraph** provides both low-level primitives and high-level prebuilt components for building agent-based applications. This section focuses on the **prebuilt**, **reusable** components designed to help you construct agentic systems quickly and reliably—without the need to implement orchestration, memory, or human feedback handling from scratch.
## Key features
LangGraph includes several capabilities essential for building robust, production-ready agentic systems:
- [**Memory integration**](./memory.md): Native support for *short-term* (session-based) and *long-term* (persistent across sessions) memory, enabling stateful behaviors in chatbots and assistants.
- [**Human-in-the-loop control**](./human-in-the-loop.md): Execution can pause *indefinitely* to await human feedback—unlike websocket-based solutions limited to real-time interaction. This enables asynchronous approval, correction, or intervention at any point in the workflow.
- [**Streaming support**](./streaming.md): Real-time streaming of agent state, model tokens, tool outputs, or combined streams.
- [**Deployment tooling**](./deployment.md): Includes infrastructure-free deployment tools. [**LangGraph Platform**](https://langchain-ai.github.io/langgraph/concepts/langgraph_platform/) supports testing, debugging, and deployment.
- **[Studio](https://langchain-ai.github.io/langgraph/concepts/langgraph_studio/)**: A visual IDE for inspecting and debugging workflows.
- Supports multiple [**deployment options**](https://langchain-ai.github.io/langgraph/tutorials/deployment/) for production.
## High-level building blocks
LangGraph comes with a set of prebuilt components that implement common agent behaviors and workflows. These abstractions are built on top of the LangGraph framework, offering a faster path to production while remaining flexible for advanced customization.
Using LangGraph for agent development allows you to focus on your application's logic and behavior, instead of building and maintaining the supporting infrastructure for state, memory, and human feedback.
## Package ecosystem
The high-level components are organized into several packages, each with a specific focus.
| Package | Description | Installation |
|--------------------------------------------|-----------------------------------------------------------------------------|-----------------------------------------|
| `langgraph-prebuilt` (part of `langgraph`) | Prebuilt components to [**create agents**](./agents.md) | `pip install -U langgraph langchain` |
| `langgraph-supervisor` | Tools for building [**supervisor**](./multi-agent.md#supervisor) agents | `pip install -U langgraph-supervisor` |
| `langgraph-swarm` | Tools for building a [**swarm**](./multi-agent.md#swarm) multi-agent system | `pip install -U langgraph-swarm` |
| `langchain-mcp-adapters` | Interfaces to [**MCP servers**](./mcp.md) for tool and resource integration | `pip install -U langchain-mcp-adapters` |
| `langmem` | Agent memory management: [**short-term and long-term**](./memory.md) | `pip install -U langmem` |
| `agentevals` | Utilities to [**evaluate agent performance**](./evals.md) | `pip install -U agentevals` |
@@ -1,4 +1,11 @@
# 🚀 Prebuilt Agents
---
tags:
- agent
hide:
- tags
---
# Community Agents
To share your project, simply open a Pull Request adding an entry for your package in our [packages.yml](https://github.com/langchain-ai/langgraph/blob/main/docs/_scripts/third_party_page/packages.yml) file.
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# Running agents
Agents support both synchronous and asynchronous execution using either `.invoke()` / `await .invoke()` for full responses, or `.stream()` / `.astream()` for **incremental** [streaming](streaming.md) output. This section explains how to provide input, interpret output, enable streaming, and control execution limits.
## Basic usage
Agents can be executed in two primary modes:
- **Synchronous** using `.invoke()` or `.stream()`
- **Asynchronous** using `await .invoke()` or `async for` with `.astream()`
=== "Sync invocation"
```python
from langgraph.prebuilt import create_react_agent
agent = create_react_agent(...)
# highlight-next-line
response = agent.invoke({"messages": [{"role": "user", "content": "what is the weather in sf"}]})
```
=== "Async invocation"
```python
from langgraph.prebuilt import create_react_agent
agent = create_react_agent(...)
# highlight-next-line
response = await agent.ainvoke({"messages": [{"role": "user", "content": "what is the weather in sf"}]})
```
## Inputs and outputs
Agents use a language model that expects a list of `messages` as an input. Therefore, agent inputs and outputs are stored as a list of `messages` under the `messages` key in the agent [state](../concepts/low_level.md#working-with-messages-in-graph-state).
## Input format
Agent input must be a dictionary with a `messages` key. Supported formats are:
| Format | Example |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------|
| String | `{"messages": "Hello"}` — Interpreted as a [HumanMessage](https://python.langchain.com/docs/concepts/messages/#humanmessage) |
| Message dictionary | `{"messages": {"role": "user", "content": "Hello"}}` |
| List of messages | `{"messages": [{"role": "user", "content": "Hello"}]}` |
| With custom state | `{"messages": [{"role": "user", "content": "Hello"}], "user_name": "Alice"}` — If using a custom `state_schema` |
Messages are automatically converted into LangChain's internal message format. You can read
more about [LangChain messages](https://python.langchain.com/docs/concepts/messages/#langchain-messages) in the LangChain documentation.
!!! tip "Using custom agent state"
You can provide additional fields defined in your agents state schema directly in the input dictionary. This allows dynamic behavior based on runtime data or prior tool outputs.
See the [context guide](./context.md) for full details.
!!! note
A string input for `messages` is converted to a [HumanMessage](https://python.langchain.com/docs/concepts/messages/#humanmessage). This behavior differs from the `prompt` parameter in `create_react_agent`, which is interpreted as a [SystemMessage](https://python.langchain.com/docs/concepts/messages/#systemmessage) when passed as a string.
## Output format
Agent output is a dictionary containing:
- `messages`: A list of all messages exchanged during execution (user input, assistant replies, tool invocations).
- Optionally, `structured_response` if [structured output](./agents.md#structured-output) is configured.
- If using a custom `state_schema`, additional keys corresponding to your defined fields may also be present in the output. These can hold updated state values from tool execution or prompt logic.
See the [context guide](./context.md) for more details on working with custom state schemas and accessing context.
## Streaming output
Agents support streaming responses for more responsive applications. This includes:
- **Progress updates** after each step
- **LLM tokens** as they're generated
- **Custom tool messages** during execution
Streaming is available in both sync and async modes:
=== "Sync streaming"
```python
for chunk in agent.stream(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
stream_mode="updates"
):
print(chunk)
```
=== "Async streaming"
```python
async for chunk in agent.astream(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
stream_mode="updates"
):
print(chunk)
```
!!! tip
For full details, see the [streaming guide](./streaming.md).
## Max iterations
To control agent execution and avoid infinite loops, set a recursion limit. This defines the maximum number of steps the agent can take before raising a `GraphRecursionError`. You can configure `recursion_limit` at runtime or when defining agent via `.with_config()`:
=== "Runtime"
```python
from langgraph.errors import GraphRecursionError
from langgraph.prebuilt import create_react_agent
max_iterations = 3
# highlight-next-line
recursion_limit = 2 * max_iterations + 1
agent = create_react_agent(
model="anthropic:claude-3-5-haiku-latest",
tools=[get_weather]
)
try:
response = agent.invoke(
{"messages": [{"role": "user", "content": "what's the weather in sf"}]},
# highlight-next-line
{"recursion_limit": recursion_limit},
)
except GraphRecursionError:
print("Agent stopped due to max iterations.")
```
=== "`.with_config()`"
```python
from langgraph.errors import GraphRecursionError
from langgraph.prebuilt import create_react_agent
max_iterations = 3
# highlight-next-line
recursion_limit = 2 * max_iterations + 1
agent = create_react_agent(
model="anthropic:claude-3-5-haiku-latest",
tools=[get_weather]
)
# highlight-next-line
agent_with_recursion_limit = agent.with_config(recursion_limit=recursion_limit)
try:
response = agent_with_recursion_limit.invoke(
{"messages": [{"role": "user", "content": "what's the weather in sf"}]},
)
except GraphRecursionError:
print("Agent stopped due to max iterations.")
```
## Additional Resources
* [Async programming in LangChain](https://python.langchain.com/docs/concepts/async)
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# Streaming
Streaming is key to building responsive applications. There are a few types of data youll want to stream:
1. [**Agent progress**](#agent-progress) — get updates after each node in the agent graph is executed.
2. [**LLM tokens**](#llm-tokens) — stream tokens as they are generated by the language model.
3. [**Custom updates**](#tool-updates) — emit custom data from tools during execution (e.g., "Fetched 10/100 records")
You can stream [more than one type of data](#stream-multiple-modes) at a time.
<figure markdown="1">
![image](./assets/fast_parrot.png){: style="max-height:300px"}
<figcaption>
Waiting is for pigeons.
</figcaption>
</figure>
## Agent progress
To stream agent progress, use the [`stream()`][langgraph.graph.state.CompiledStateGraph.stream] or [`astream()`][langgraph.graph.state.CompiledStateGraph.astream] methods with [`stream_mode="updates"`](https://langchain-ai.github.io/langgraph/how-tos/streaming/#updates). This emits an event after every agent step.
For example, if you have an agent that calls a tool once, you should see the following updates:
* **LLM node**: AI message with tool call requests
* **Tool node**: Tool message with execution result
* **LLM node**: Final AI response
=== "Sync"
```python
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
)
# highlight-next-line
for chunk in agent.stream(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
# highlight-next-line
stream_mode="updates"
):
print(chunk)
print("\n")
```
=== "Async"
```python
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
)
# highlight-next-line
async for chunk in agent.astream(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
# highlight-next-line
stream_mode="updates"
):
print(chunk)
print("\n")
```
## LLM tokens
To stream tokens as they are produced by the LLM, use `stream_mode="messages"`:
=== "Sync"
```python
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
)
# highlight-next-line
for token, metadata in agent.stream(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
# highlight-next-line
stream_mode="messages"
):
print("Token", token)
print("Metadata", metadata)
print("\n")
```
=== "Async"
```python
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
)
# highlight-next-line
async for token, metadata in agent.astream(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
# highlight-next-line
stream_mode="messages"
):
print("Token", token)
print("Metadata", metadata)
print("\n")
```
## Tool updates
To stream updates from tools as they are executed, you can use [get_stream_writer][langgraph.config.get_stream_writer].
=== "Sync"
```python
# highlight-next-line
from langgraph.config import get_stream_writer
def get_weather(city: str) -> str:
"""Get weather for a given city."""
# highlight-next-line
writer = get_stream_writer()
# stream any arbitrary data
# highlight-next-line
writer(f"Looking up data for city: {city}")
return f"It's always sunny in {city}!"
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
)
for chunk in agent.stream(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
# highlight-next-line
stream_mode="custom"
):
print(chunk)
print("\n")
```
=== "Async"
```python
# highlight-next-line
from langgraph.config import get_stream_writer
def get_weather(city: str) -> str:
"""Get weather for a given city."""
# highlight-next-line
writer = get_stream_writer()
# stream any arbitrary data
# highlight-next-line
writer(f"Looking up data for city: {city}")
return f"It's always sunny in {city}!"
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
)
async for chunk in agent.astream(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
# highlight-next-line
stream_mode="custom"
):
print(chunk)
print("\n")
```
!!! Note
If you add `get_stream_writer` inside your tool, you won't be able to invoke the tool outside of a LangGraph execution context.
## Stream multiple modes
You can specify multiple streaming modes by passing stream mode as a list: `stream_mode=["updates", "messages", "custom"]`:
=== "Sync"
```python
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
)
for stream_mode, chunk in agent.stream(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
# highlight-next-line
stream_mode=["updates", "messages", "custom"]
):
print(chunk)
print("\n")
```
=== "Async"
```python
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[get_weather],
)
async for stream_mode, chunk in agent.astream(
{"messages": [{"role": "user", "content": "what is the weather in sf"}]},
# highlight-next-line
stream_mode=["updates", "messages", "custom"]
):
print(chunk)
print("\n")
```
## Disable streaming
In some applications you might need to disable streaming of individual tokens for a given model. This is useful in [multi-agent](./multi-agent.md) systems to control which agents stream their output.
See the [Models](./models.md#disable-streaming) guide to learn how to disable streaming.
## Additional resources
* [Streaming in LangGraph](https://langchain-ai.github.io/langgraph/how-tos/streaming)
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# Tools
[Tools](https://python.langchain.com/docs/concepts/tools/) are a way to encapsulate a function and its input schema in a way that can be passed to a chat model that supports tool calling. This allows the model to request the execution of this function with specific inputs.
You can either [define your own tools](#define-simple-tools) or use [prebuilt integrations](#prebuilt-tools) that LangChain provides.
## Define simple tools
You can pass a vanilla function to `create_react_agent` to use as a tool:
```python
from langgraph.prebuilt import create_react_agent
def multiply(a: int, b: int) -> int:
"""Multiply two numbers."""
return a * b
create_react_agent(
model="anthropic:claude-3-7-sonnet",
tools=[multiply]
)
```
`create_react_agent` automatically converts vanilla functions to [LangChain tools](https://python.langchain.com/docs/concepts/tools/#tool-interface).
## Customize tools
For more control over tool behavior, use the `@tool` decorator:
```python
# highlight-next-line
from langchain_core.tools import tool
# highlight-next-line
@tool("multiply_tool", parse_docstring=True)
def multiply(a: int, b: int) -> int:
"""Multiply two numbers.
Args:
a: First operand
b: Second operand
"""
return a * b
```
You can also define a custom input schema using Pydantic:
```python
from pydantic import BaseModel, Field
class MultiplyInputSchema(BaseModel):
"""Multiply two numbers"""
a: int = Field(description="First operand")
b: int = Field(description="Second operand")
# highlight-next-line
@tool("multiply_tool", args_schema=MultiplyInputSchema)
def multiply(a: int, b: int) -> int:
return a * b
```
For additional customization, refer to the [custom tools guide](https://python.langchain.com/docs/how_to/custom_tools/).
## Hide arguments from the model
Some tools require runtime-only arguments (e.g., user ID or session context) that should not be controllable by the model.
You can put these arguments in the `state` or `config` of the agent, and access
this information inside the tool:
```python
from langgraph.prebuilt import InjectedState
from langgraph.prebuilt.chat_agent_executor import AgentState
from langchain_core.runnables import RunnableConfig
def my_tool(
# This will be populated by an LLM
tool_arg: str,
# access information that's dynamically updated inside the agent
# highlight-next-line
state: Annotated[AgentState, InjectedState],
# access static data that is passed at agent invocation
# highlight-next-line
config: RunnableConfig,
) -> str:
"""My tool."""
do_something_with_state(state["messages"])
do_something_with_config(config)
...
```
## Disable parallel tool calling
Some model providers support executing multiple tools in parallel, but
allow users to disable this feature.
For supported providers, you can disable parallel tool calling by setting `parallel_tool_calls=False` via the `model.bind_tools()` method:
```python
from langchain.chat_models import init_chat_model
def add(a: int, b: int) -> int:
"""Add two numbers"""
return a + b
def multiply(a: int, b: int) -> int:
"""Multiply two numbers."""
return a * b
model = init_chat_model("anthropic:claude-3-5-sonnet-latest", temperature=0)
tools = [add, multiply]
agent = create_react_agent(
# disable parallel tool calls
# highlight-next-line
model=model.bind_tools(tools, parallel_tool_calls=False),
tools=tools
)
agent.invoke(
{"messages": [{"role": "user", "content": "what's 3 + 5 and 4 * 7?"}]}
)
```
## Return tool results directly
Use `return_direct=True` to return tool results immediately and stop the agent loop:
```python
from langchain_core.tools import tool
# highlight-next-line
@tool(return_direct=True)
def add(a: int, b: int) -> int:
"""Add two numbers"""
return a + b
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[add]
)
agent.invoke(
{"messages": [{"role": "user", "content": "what's 3 + 5?"}]}
)
```
## Force tool use
To force the agent to use specific tools, you can set the `tool_choice` option in `model.bind_tools()`:
```python
from langchain_core.tools import tool
# highlight-next-line
@tool(return_direct=True)
def greet(user_name: str) -> int:
"""Greet user."""
return f"Hello {user_name}!"
tools = [greet]
agent = create_react_agent(
# highlight-next-line
model=model.bind_tools(tools, tool_choice={"type": "tool", "name": "greet"}),
tools=tools
)
agent.invoke(
{"messages": [{"role": "user", "content": "Hi, I am Bob"}]}
)
```
!!! Warning "Avoid infinite loops"
Forcing tool usage without stopping conditions can create infinite loops. Use one of the following safeguards:
- Mark the tool with [`return_direct=True`](#return-tool-results-directly) to end the loop after execution.
- Set [`recursion_limit`](../concepts/low_level.md#recursion-limit) to restrict the number of execution steps.
## Handle tool errors
By default, the agent will catch all exceptions raised during tool calls and will pass those as tool messages to the LLM. To control how the errors are handled, you can use the prebuilt [`ToolNode`][langgraph.prebuilt.tool_node.ToolNode] — the node that executes tools inside `create_react_agent` — via its `handle_tool_errors` parameter:
=== "Enable error handling (default)"
```python
from langgraph.prebuilt import create_react_agent
def multiply(a: int, b: int) -> int:
"""Multiply two numbers."""
if a == 42:
raise ValueError("The ultimate error")
return a * b
# Run with error handling (default)
agent = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=[multiply]
)
agent.invoke(
{"messages": [{"role": "user", "content": "what's 42 x 7?"}]}
)
```
=== "Disable error handling"
```python
from langgraph.prebuilt import create_react_agent, ToolNode
def multiply(a: int, b: int) -> int:
"""Multiply two numbers."""
if a == 42:
raise ValueError("The ultimate error")
return a * b
# highlight-next-line
tool_node = ToolNode(
[multiply],
# highlight-next-line
handle_tool_errors=False # (1)!
)
agent_no_error_handling = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=tool_node
)
agent_no_error_handling.invoke(
{"messages": [{"role": "user", "content": "what's 42 x 7?"}]}
)
```
1. This disables error handling (enabled by default). See all available strategies in the [API reference][langgraph.prebuilt.tool_node.ToolNode].
=== "Custom error handling"
```python
from langgraph.prebuilt import create_react_agent, ToolNode
def multiply(a: int, b: int) -> int:
"""Multiply two numbers."""
if a == 42:
raise ValueError("The ultimate error")
return a * b
# highlight-next-line
tool_node = ToolNode(
[multiply],
# highlight-next-line
handle_tool_errors=(
"Can't use 42 as a first operand, you must switch operands!" # (1)!
)
)
agent_custom_error_handling = create_react_agent(
model="anthropic:claude-3-7-sonnet-latest",
tools=tool_node
)
agent_custom_error_handling.invoke(
{"messages": [{"role": "user", "content": "what's 42 x 7?"}]}
)
```
1. This provides a custom message to send to the LLM in case of an exception. See all available strategies in the [API reference][langgraph.prebuilt.tool_node.ToolNode].
See [API reference][langgraph.prebuilt.tool_node.ToolNode] for more information on different tool error handling options.
## Working with memory
LangGraph allows access to short-term and long-term memory from tools. See [Memory](./memory.md) guide for more information on:
* how to [read](./memory.md#read-short-term) from and [write](./memory.md#write-short-term) to **short-term** memory
* how to [read](./memory.md#read-long-term) from and [write](./memory.md#write-long-term) to **long-term** memory
## Prebuilt tools
LangChain supports a wide range of prebuilt tool integrations for interacting with APIs, databases, file systems, web data, and more. These tools extend the functionality of agents and enable rapid development.
You can browse the full list of available integrations in the [LangChain integrations directory](https://python.langchain.com/docs/integrations/tools/).
Some commonly used tool categories include:
- **Search**: Bing, SerpAPI, Tavily
- **Code interpreters**: Python REPL, Node.js REPL
- **Databases**: SQL, MongoDB, Redis
- **Web data**: Web scraping and browsing
- **APIs**: OpenWeatherMap, NewsAPI, and others
These integrations can be configured and added to your agents using the same `tools` parameter shown in the examples above.
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# UI
You can use a prebuilt chat UI for interacting with any LangGraph agent through the [Agent Chat UI](https://github.com/langchain-ai/agent-chat-ui). Using the [deployed version](https://agentchat.vercel.app) is the quickest way to get started, and allows you to interact with both local and deployed graphs.
## Run agent in UI
First, set up LangGraph API server [locally](./deployment.md#launch-langgraph-server-locally) or deploy your agent on [LangGraph Cloud](https://langchain-ai.github.io/langgraph/cloud/quick_start/).
Then, navigate to [Agent Chat UI](https://agentchat.vercel.app), or clone the repository and [run the dev server locally](https://github.com/langchain-ai/agent-chat-ui?tab=readme-ov-file#setup):
<video controls src="../assets/base-chat-ui.mp4" type="video/mp4"></video>
!!! Tip
UI has out-of-box support for rendering tool calls, and tool result messages. To customize what messages are shown, see the [Hiding Messages in the Chat](https://github.com/langchain-ai/agent-chat-ui?tab=readme-ov-file#hiding-messages-in-the-chat) section in the Agent Chat UI documentation.
## Add human-in-the-loop
Agent Chat UI has full support for [human-in-the-loop](../concepts/human_in_the_loop.md) workflows. To try it out, replace the agent code in `src/agent/graph.py` (from the [deployment](./deployment.md) guide) with this [agent implementation](./human-in-the-loop.md#using-with-agent-inbox):
<video controls src="../assets/interrupt-chat-ui.mp4" type="video/mp4"></video>
!!! Important
Agent Chat UI works best if your LangGraph agent interrupts using the [`HumanInterrupt` schema][langgraph.prebuilt.interrupt.HumanInterrupt]. If you do not use that schema, the Agent Chat UI will be able to render the input passed to the `interrupt` function, but it will not have full support for resuming your graph.
## Generative UI
You can also use generative UI in the Agent Chat UI.
Generative UI allows you to define [React](https://react.dev/) components, and push them to the UI from the LangGraph server. For more documentation on building generative UI LangGraph agents, read [these docs](https://langchain-ai.github.io/langgraph/cloud/how-tos/generative_ui_react/).
+10 -10
View File
@@ -107,13 +107,13 @@ After installing and authorizing LangChain's `hosted-langserve` GitHub app, repo
All traffic from `LangGraph Platform` deployments created after January 6th 2025 will come through a NAT gateway.
This NAT gateway will have several static ip addresses depending on the region you are deploying in. Refer to the table below for the list of IP addresses to whitelist:
| US | EU |
|----------------|----------------|
| 35.197.29.146 | 34.13.192.67 |
| 34.145.102.123 | 34.147.105.64 |
| 34.169.45.153 | 34.90.22.166 |
| 34.82.222.17 | 34.147.36.213 |
| 35.227.171.135 | 34.32.137.113 |
| 34.169.88.30 | 34.91.238.184 |
| 34.19.93.202 | 35.204.101.241 |
| 34.19.34.50 | 35.204.48.32 |
| US | EU |
|----------------|-----------------|
| 35.197.29.146 | 34.90.213.236 |
| 34.145.102.123 | 34.13.244.114 |
| 34.169.45.153 | 34.32.180.189 |
| 34.82.222.17 | 34.34.69.108 |
| 35.227.171.135 | 34.32.145.240 |
| 34.169.88.30 | 34.90.157.44 |
| 34.19.93.202 | 34.141.242.180 |
| 34.19.34.50 | 34.32.141.108 |
@@ -12,19 +12,13 @@ Before deploying, review the [conceptual guide for the Self-Hosted Control Plane
helm repo add kedacore https://kedacore.github.io/charts
helm install keda kedacore/keda --namespace keda --create-namespace
1. Ingress Configuration (recommended)
1. Install `Ingress Nginx` to serve as a reverse proxy for your deployment.
helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
helm repo update
helm install ingress-nginx ingress-nginx/ingress-nginx
1. Provision a root domain that will suffix all domains for your workloads (e.g. `us.langgraph.app`).
1. Provision wildcard certificates to terminate TLS for your deployments.
1. Note: If this step is skipped, you will need to provision domains/certs for each of your deployments.
1. Ingress Configuration
1. You must set up an ingress for your LangSmith instance. All agents will be deployed as Kubernetes services behind this ingress.
1. You can use this guide to [set up an ingress](https://docs.smith.langchain.com/self_hosting/configuration/ingress) for your instance.
1. You have slack space in your cluster for multiple deployments. `Cluster-Autoscaler` is recommended to automatically provision new nodes.
1. A valid Dynamic PV provisioner or PVs available on your cluster. You can verify this by running:
kubectl get storageclass
## Setup
@@ -44,13 +38,12 @@ Before deploying, review the [conceptual guide for the Self-Hosted Control Plane
pullPolicy: IfNotPresent
tag: "aa9dff4"
1. In your `values.yaml` file, enable the `langgraphPlatform` option.
1. In your `values.yaml` file, enable the `langgraphPlatform` option. Note that you must also have a valid ingress setup:
config:
langgraphPlatform:
enabled: true
langgraphPlatformLicenseKey: "YOUR_LANGGRAPH_PLATFORM_LICENSE_KEY"
rootDomain: "YOUR_ROOT_DOMAIN"
1. In your `values.yaml` file, configure the `hostBackendImage` and `operatorImage` options (if you need to mirror images)
1. You can also configure base templates for your agents by overriding the base templates [here](https://github.com/langchain-ai/helm/blob/main/charts/langsmith/values.yaml#L898).
1. You create a deployment from the [Control Plane UI](../../concepts/langgraph_control_plane.md#control-plane-ui).
+15 -12
View File
@@ -40,6 +40,14 @@ Example `package.json` file:
}
```
When deploying your app, the dependencies will be installed using the package manager of your choice, provided they adhere to the compatible version ranges listed below:
```
"@langchain/core": "^0.3.42",
"@langchain/langgraph": "^0.2.57",
"@langchain/langgraph-checkpoint": "~0.0.16",
```
Example file directory:
```bash
@@ -82,14 +90,10 @@ import { ChatOpenAI } from "@langchain/openai";
import { MessagesAnnotation, StateGraph } from "@langchain/langgraph";
import { ToolNode } from "@langchain/langgraph/prebuilt";
const tools = [
new TavilySearchResults({ maxResults: 3, }),
];
const tools = [new TavilySearchResults({ maxResults: 3 })];
// Define the function that calls the model
async function callModel(
state: typeof MessagesAnnotation.State,
) {
async function callModel(state: typeof MessagesAnnotation.State) {
/**
* Call the LLM powering our agent.
* Feel free to customize the prompt, model, and other logic!
@@ -101,9 +105,9 @@ async function callModel(
const response = await model.invoke([
{
role: "system",
content: `You are a helpful assistant. The current date is ${new Date().getTime()}.`
content: `You are a helpful assistant. The current date is ${new Date().getTime()}.`,
},
...state.messages
...state.messages,
]);
// MessagesAnnotation supports returning a single message or array of messages
@@ -141,10 +145,7 @@ const workflow = new StateGraph(MessagesAnnotation)
routeModelOutput,
// List of the possible destinations the conditional edge can route to.
// Required for conditional edges to properly render the graph in Studio
[
"tools",
"__end__"
],
["tools", "__end__"]
)
// This means that after `tools` is called, `callModel` node is called next.
.addEdge("tools", "callModel");
@@ -155,6 +156,7 @@ export const graph = workflow.compile();
```
!!! info "Assign `CompiledGraph` to Variable"
The build process for LangGraph Cloud requires that the `CompiledGraph` object be assigned to a variable at the top-level of a JavaScript module (alternatively, you can provide [a function that creates a graph](./graph_rebuild.md)).
Example file directory:
@@ -193,6 +195,7 @@ Example `langgraph.json` file:
Note that the variable name of the `CompiledGraph` appears at the end of the value of each subkey in the top-level `graphs` key (i.e. `:<variable_name>`).
!!! info "Configuration Location"
The LangGraph API configuration file must be placed in a directory that is at the same level or higher than the TypeScript files that contain compiled graphs and associated dependencies.
## Next
@@ -22,7 +22,7 @@ To support this, LangGraph Studio, in combination with LangSmith, allows you to
First navigate to the LangSmith trace. Here you should see a button to "Run in Studio".
![Run in Studio](../img/run_in_studio.png){width=1200}
![Run in Studio](img/run_in_studio.png){width=1200}
This will prompt you to enter the url that your locally running agent is accessible at. Once provided, select "Clone thread locally". If you have multiple graphs in your agent, you will also be prompted to select a graph to clone this thread under.
@@ -0,0 +1,86 @@
# Configurable Headers
LangGraph allows runtime configuration to modify agent behavior and permissions dynamically. When using the [LangGraph Platform](../quick_start.md), you can pass this configuration in the request body (`config`) or specific request headers. This enables adjustments based on user identity or other request data (see the [configuration how-to](../../how-tos/configuration.ipynb) for more details on how to access within your graph).
For privacy, control which headers are passed to the runtime configuration via the `http.configurable_headers` section in your `langgraph.json` file.
Here's how to customize the included and excluded headers:
```json
{
"http": {
"configurable_headers": {
"include": ["x-user-id", "x-organization-id", "my-prefix-*"],
"exclude": ["authorization", "x-api-key"]
}
}
}
```
The `include` and `exclude` lists accept exact header names or patterns using `*` to match any number of characters. For your security, no other regex patterns are supported.
## Using within your graph
You can access the included headers in your graph using the `config` argument of any node.
```python
def my_node(state, config):
organization_id = config["configurable"].get("x-organization-id")
...
```
Or by fetching from context (useful in tools and or within other nested functions).
```python
from langgraph.config import get_config
def search_everything(query: str):
organization_id = get_config()["configurable"].get("x-organization-id")
...
```
You can even use this to dynamically compile the graph.
```python
# my_graph.py.
import contextlib
@contextlib.asynccontextmanager
async def generate_agent(config):
organization_id = config["configurable"].get("x-organization-id")
if organization_id == "org1":
graph = ...
yield graph
else:
graph = ...
yield graph
```
```json
{
"graphs": {"agent": "my_grph.py:generate_agent"}
}
```
For more examples on how to use runtime configuration, check out the [configuration how-to](../../how-tos/configuration.ipynb).
### Opt-out of configurable headers
If you'd like to opt-out of configurable headers, you can simply set a wildcard pattern in the `exclude` list:
```json
{
"http": {
"configurable_headers": {
"exclude": ["*"]
}
}
}
```
This will exclude all headers from being added to your run's configuration.
Note that exclusions take precedence over inclusions.
+170 -14
View File
@@ -207,18 +207,6 @@ Behind the scenes, `LoadExternalComponent` will fetch the JS and CSS for the UI
## How-to guides
### Show loading UI when components are loading
You can provide a fallback UI to be rendered when the components are loading.
```tsx
<LoadExternalComponent
stream={thread}
message={ui}
fallback={<div>Loading...</div>}
/>
```
### Provide custom components on the client side
If you already have the components loaded in your client application, you can provide a map of such components to be rendered directly without fetching the UI code from LangGraph Platform.
@@ -235,6 +223,18 @@ const clientComponents = {
/>;
```
### Show loading UI when components are loading
You can provide a fallback UI to be rendered when the components are loading.
```tsx
<LoadExternalComponent
stream={thread}
message={ui}
fallback={<div>Loading...</div>}
/>
```
### Customise the namespace of UI components.
By default `LoadExternalComponent` will use the `assistantId` from `useStream()` hook to fetch the code for UI components. You can customise this by providing a `namespace` prop to the `LoadExternalComponent` component.
@@ -316,9 +316,9 @@ const WeatherComponent = (props: { city: string }) => {
};
```
### Streaming UI updates before the node execution is finished
### Streaming UI messages from the server
You can stream UI updates before the node execution is finished by using the `onCustomEvent` callback of the `useStream()` hook.
You can stream UI messages before the node execution is finished by using the `onCustomEvent` callback of the `useStream()` hook. This is especially useful when updating the UI component as the LLM is generating the response.
```tsx
import { uiMessageReducer } from "@langchain/langgraph-sdk/react-ui";
@@ -335,6 +335,162 @@ const { thread, submit } = useStream({
});
```
Then you can pushing updates to the UI component by calling `ui.push()` / `push_ui_message()` with the same ID as the UI message you wish to update.
=== "Python"
```python
from typing import Annotated, Sequence, TypedDict
from langchain_anthropic import ChatAnthropic
from langchain_core.messages import AIMessage, AIMessageChunk, BaseMessage
from langgraph.graph import StateGraph
from langgraph.graph.message import add_messages
from langgraph.graph.ui import AnyUIMessage, push_ui_message, ui_message_reducer
class AgentState(TypedDict): # noqa: D101
messages: Annotated[Sequence[BaseMessage], add_messages]
ui: Annotated[Sequence[AnyUIMessage], ui_message_reducer]
class CreateTextDocument(TypedDict):
"""Prepare a document heading for the user."""
title: str
async def writer_node(state: AgentState):
model = ChatAnthropic(model="claude-3-5-sonnet-latest")
message: AIMessage = await model.bind_tools(
tools=[CreateTextDocument],
tool_choice={"type": "tool", "name": "CreateTextDocument"},
).ainvoke(state["messages"])
tool_call = next(
(x["args"] for x in message.tool_calls if x["name"] == "CreateTextDocument"),
None,
)
if tool_call:
ui_message = push_ui_message("writer", tool_call, message=message)
ui_message_id = ui_message["id"]
# We're already streaming the LLM response to the client through UI messages
# so we don't need to stream it again to the `messages` stream mode.
content_stream = model.with_config({"tags": ["nostream"]}).astream(
f"Create a document with the title: {tool_call['title']}"
)
content: AIMessageChunk | None = None
async for chunk in content_stream:
content = content + chunk if content else chunk
push_ui_message(
"writer",
{"content": content.text()},
id=ui_message_id,
message=message,
# Use `merge=rue` to merge props with the existing UI message
merge=True,
)
return {"messages": [message]}
```
=== "JS"
```tsx
import {
Annotation,
MessagesAnnotation,
type LangGraphRunnableConfig,
} from "@langchain/langgraph";
import { z } from "zod";
import { ChatAnthropic } from "@langchain/anthropic";
import {
typedUi,
uiMessageReducer,
} from "@langchain/langgraph-sdk/react-ui/server";
import type { AIMessageChunk } from "@langchain/core/messages";
import type ComponentMap from "./ui";
const AgentState = Annotation.Root({
...MessagesAnnotation.spec,
ui: Annotation({ reducer: uiMessageReducer, default: () => [] }),
});
async function writerNode(
state: typeof AgentState.State,
config: LangGraphRunnableConfig
): Promise<typeof AgentState.Update> {
const ui = typedUi<typeof ComponentMap>(config);
const model = new ChatAnthropic({ model: "claude-3-5-sonnet-latest" });
const message = await model
.bindTools(
[
{
name: "create_text_document",
description: "Prepare a document heading for the user.",
schema: z.object({ title: z.string() }),
},
],
{ tool_choice: { type: "tool", name: "create_text_document" } }
)
.invoke(state.messages);
type ToolCall = { name: "create_text_document"; args: { title: string } };
const toolCall = message.tool_calls?.find(
(tool): tool is ToolCall => tool.name === "create_text_document"
);
if (toolCall) {
const { id, name } = ui.push(
{ name: "writer", props: { title: toolCall.args.title } },
{ message }
);
const contentStream = await model
// We're already streaming the LLM response to the client through UI messages
// so we don't need to stream it again to the `messages` stream mode.
.withConfig({ tags: ["nostream"] })
.stream(`Create a short poem with the topic: ${message.text}`);
let content: AIMessageChunk | undefined;
for await (const chunk of contentStream) {
content = content?.concat(chunk) ?? chunk;
ui.push(
{ id, name, props: { content: content?.text } },
// Use `merge: true` to merge props with the existing UI message
{ message, merge: true }
);
}
}
return { messages: [message] };
}
```
=== "`ui.tsx`"
```tsx
function WriterComponent(props: { title: string; content?: string }) {
return (
<article>
<h2>{props.title}</h2>
<p style={{ whiteSpace: "pre-wrap" }}>{props.content}</p>
</article>
);
}
export default {
weather: WriterComponent,
};
```
### Remove UI messages from state
Similar to how messages can be removed from the state by appending a RemoveMessage you can remove an UI message from the state by calling `remove_ui_message` / `ui.delete` with the ID of the UI message.
@@ -1,12 +1,16 @@
# How to Add Breakpoints
# How to add static breakpoints
When creating LangGraph agents, it is often nice to add a human-in-the-loop component.
This can be helpful when giving them access to tools.
Often in these situations you may want to manually approve an action before taking.
!!! tip "Prerequisites"
This can be in several ways, but the primary supported way is to add an "interrupt" before a node is executed.
This interrupts execution at that node.
You can then resume from that spot to continue.
This guide assumes familiarity with the following concepts:
* [Breakpoints](../../concepts/breakpoints.md)
* [LangGraph Glossary](../../concepts/low_level.md)
Human-in-the-loop (HIL) interactions are crucial for [agentic systems](../../concepts/agentic_concepts.md#human-in-the-loop). [Breakpoints](../../concepts/low_level.md#breakpoints) are a common HIL interaction pattern, allowing the graph to stop at specific steps and seek human approval before proceeding (e.g., for sensitive actions).
Breakpoints are built on top of LangGraph [checkpoints](../../concepts/low_level.md#persistence), which save the graph's state after each node execution. Checkpoints are saved in [threads](../../concepts/low_level.md#threads) that preserve graph state and can be accessed after a graph has finished execution. This allows for graph execution to pause at specific points, await human approval, and then resume execution from the last checkpoint.
## Setup
@@ -1,6 +1,14 @@
# Review Tool Calls
# How to review tool calls
Human-in-the-loop (HIL) interactions are crucial for [agentic systems](https://langchain-ai.github.io/langgraph/concepts/agentic_concepts/#human-in-the-loop). A common pattern is to add some human in the loop step after certain tool calls. These tool calls often lead to either a function call or saving of some information. Examples include:
!!! tip "Prerequisites"
This guide assumes familiarity with the following concepts:
* [Tool calling](https://python.langchain.com/docs/concepts/tool_calling/)
* [Human-in-the-loop](../../concepts/human_in_the_loop.md)
* [LangGraph Glossary](../../concepts/low_level.md)
Human-in-the-loop (HIL) interactions are crucial for [agentic systems](../../concepts/agentic_concepts.md). A common pattern is to add some human in the loop step after certain tool calls. These tool calls often lead to either a function call or saving of some information. Examples include:
- A tool call to execute SQL, which will then be run by the tool
- A tool call to generate a summary, which will then be saved to the State of the graph
@@ -11,13 +19,46 @@ There are typically a few different interactions you may want to do here:
1. Approve the tool call and continue
2. Modify the tool call manually and then continue
3. Give natural language feedback, and then pass that back to the agent instead of continuing
3. Give natural language feedback, and then pass that back to the agent
We can implement this in LangGraph using a [breakpoint](https://langchain-ai.github.io/langgraph/how-tos/human_in_the_loop/breakpoints/): breakpoints allow us to interrupt graph execution before a specific step. At this breakpoint, we can manually update the graph state taking one of the three options above
We can implement these in LangGraph using the [`interrupt()`][langgraph.types.interrupt] function. `interrupt` allows us to stop graph execution to collect input from a user and continue execution with collected input:
```python
def human_review_node(state) -> Command[Literal["call_llm", "run_tool"]]:
# this is the value we'll be providing via Command(resume=<human_review>)
human_review = interrupt(
{
"question": "Is this correct?",
# Surface tool calls for review
"tool_call": tool_call
}
)
review_action, review_data = human_review
# Approve the tool call and continue
if review_action == "continue":
return Command(goto="run_tool")
# Modify the tool call manually and then continue
elif review_action == "update":
...
updated_msg = get_updated_msg(review_data)
return Command(goto="run_tool", update={"messages": [updated_message]})
# Give natural language feedback, and then pass that back to the agent
elif review_action == "feedback":
...
feedback_msg = get_feedback_msg(review_data)
return Command(goto="call_llm", update={"messages": [feedback_msg]})
```
## Setup
We are not going to show the full code for the graph we are hosting, but you can see it [here](../../how-tos/human_in_the_loop/review-tool-calls.ipynb#simple-usage) if you want to. Once this graph is hosted, we are ready to invoke it and wait for user input.
We are not going to show the full code for the graph we are hosting, but you can see it [here](../../how-tos/human_in_the_loop/review-tool-calls.ipynb). Once this graph is hosted, we are ready to invoke it and wait for user input.
### SDK initialization
@@ -54,122 +95,9 @@ First, we need to setup our client so that we can communicate with our hosted gr
--data '{}'
```
## Example with no review
Let's look at an example when no review is required (because no tools are called)
=== "Python"
```python
input = { 'messages':[{ "role":"user", "content":"hi!" }] }
async for chunk in client.runs.stream(
thread["thread_id"],
assistant_id,
input=input,
stream_mode="updates",
interrupt_before=["action"],
):
if chunk.data and chunk.event != "metadata":
print(chunk.data)
```
=== "Javascript"
```js
const input = { "messages": [{ "role": "user", "content": "hi!" }] };
const streamResponse = client.runs.stream(
thread["thread_id"],
assistantId,
{
input: input,
streamMode: "updates",
interruptBefore: ["action"],
}
);
for await (const chunk of streamResponse) {
if (chunk.data && chunk.event !== "metadata") {
console.log(chunk.data);
}
}
```
=== "CURL"
```bash
curl --request POST \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/runs/stream \
--header 'Content-Type: application/json' \
--data "{
\"assistant_id\": \"agent\",
\"input\": {\"messages\": [{\"role\": \"human\", \"content\": \"hi!\"}]},
\"stream_mode\": [
\"updates\"
],
\"interrupt_before\": [\"action\"]
}" | \
sed 's/\r$//' | \
awk '
/^event:/ {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
sub(/^event: /, "", $0)
event_type = $0
data_content = ""
}
/^data:/ {
sub(/^data: /, "", $0)
data_content = $0
}
END {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
}
'
```
Output:
{'messages': [{'content': 'hi!', 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '39c51f14-2d5c-4690-883a-d940854b1845', 'example': False}]}
{'messages': [{'content': 'hi!', 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '39c51f14-2d5c-4690-883a-d940854b1845', 'example': False}, {'content': [{'text': "Hello! Welcome. How can I assist you today? Is there anything specific you'd like to know or any information you're looking for?", 'type': 'text', 'index': 0}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'end_turn', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-d65e07fb-43ff-4d98-ab6b-6316191b9c8b', 'example': False, 'tool_calls': [], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 355, 'output_tokens': 31, 'total_tokens': 386}}]}
If we check the state, we can see that it is finished
=== "Python"
```python
state = await client.threads.get_state(thread["thread_id"])
print(state['next'])
```
=== "Javascript"
```js
const state = await client.threads.getState(thread["thread_id"]);
console.log(state.next);
```
=== "CURL"
```bash
curl --request GET \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/state | jq -c '.next'
```
Output:
[]
## Example of approving tool
Let's now look at what it looks like to approve a tool call. Note that we don't need to pass an interrupt to our streaming calls because the graph (defined [here](../../how-tos/human_in_the_loop/review-tool-calls.ipynb#simple-usage)) was already compiled with an interrupt before the `human_review_node`.
First, let's run the agent with an input that requires tool calls with approval:
=== "Python"
@@ -180,6 +108,7 @@ Let's now look at what it looks like to approve a tool call. Note that we don't
thread["thread_id"],
assistant_id,
input=input,
stream_mode="updates",
):
if chunk.data and chunk.event != "metadata":
print(chunk.data)
@@ -195,6 +124,7 @@ Let's now look at what it looks like to approve a tool call. Note that we don't
assistantId,
{
input: input,
streamMode: "updates"
}
);
@@ -213,75 +143,32 @@ Let's now look at what it looks like to approve a tool call. Note that we don't
--header 'Content-Type: application/json' \
--data "{
\"assistant_id\": \"agent\",
\"input\": {\"messages\": [{\"role\": \"human\", \"content\": \"what's the weather in sf?\"}]}
}" | \
sed 's/\r$//' | \
awk '
/^event:/ {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
sub(/^event: /, "", $0)
event_type = $0
data_content = ""
}
/^data:/ {
sub(/^data: /, "", $0)
data_content = $0
}
END {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
}
'
\"input\": {\"messages\": [{\"role\": \"human\", \"content\": \"what's the weather in sf?\"}]},
\"stream_mode\": [
\"updates\"
]
}"
```
Output:
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '54e19d6e-89fa-44fb-b92c-12e7dd4ddf08', 'example': False}]}
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '54e19d6e-89fa-44fb-b92c-12e7dd4ddf08', 'example': False}, {'content': [{'text': "Certainly! I can help you check the weather in San Francisco. To get this information, I'll use the weather search function. Let me do that for you right away.", 'type': 'text', 'index': 0}, {'id': 'toolu_015yrR3GMDXe6X8m2p9CsEDN', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-45a6b6c3-ac69-42a4-8957-d982203d6392', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco'}, 'id': 'toolu_015yrR3GMDXe6X8m2p9CsEDN', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 360, 'output_tokens': 90, 'total_tokens': 450}}]}
{'call_llm': {'messages': [{'content': [{'text': "I'll help you check the weather in San Francisco.", 'type': 'text'}, {'id': 'toolu_01142G3woscA8JjFTLdqymtn', 'input': {'city': 'San Francisco'}, 'name': 'weather_search', 'type': 'tool_use'}], 'additional_kwargs': {}, 'response_metadata': {'id': 'msg_01Tdfufy4nZYXMbVZvgyNbhc', 'model': 'claude-3-5-sonnet-20241022', 'stop_reason': 'tool_use', 'stop_sequence': None, 'usage': {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 379, 'output_tokens': 66}, 'model_name': 'claude-3-5-sonnet-20241022'}, 'type': 'ai', 'name': None, 'id': 'run-a33434b2-f5ca-40c6-98e2-6288d349d4ce-0', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco'}, 'id': 'toolu_01142G3woscA8JjFTLdqymtn', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 379, 'output_tokens': 66, 'total_tokens': 445, 'input_token_details': {'cache_read': 0, 'cache_creation': 0}}}]}}
{'__interrupt__': [{'value': {'question': 'Is this correct?', 'tool_call': {'name': 'weather_search', 'args': {'city': 'San Francisco'}, 'id': 'toolu_01142G3woscA8JjFTLdqymtn', 'type': 'tool_call'}}, 'resumable': True, 'ns': ['human_review_node:9caf42cf-1371-7213-a331-e6fe5d026be8'], 'when': 'during'}]}
If we now check, we can see that it is waiting on human review:
To approve the tool call, we need to let `human_review_node` know what value to use for the `human_review` variable we defined inside the node. We can provide this value by invoking the graph with a `Command(resume=<human_review>)` input. Since we're approving the tool call, we'll provide `resume` value of `{"action": "continue"}` to navigate to `run_tool` node:
=== "Python"
```python
state = await client.threads.get_state(thread["thread_id"])
# highlight-next-line
from langgraph_sdk.schema import Command
print(state['next'])
```
=== "Javascript"
```js
const state = await client.threads.getState(thread["thread_id"]);
console.log(state.next);
```
=== "CURL"
```bash
curl --request GET \
--url <DELPOYMENT_URL>/threads/<THREAD_ID>/state | jq -c '.next'
```
Output:
['human_review_node']
To approve the tool call, we can just continue the thread with no edits. To do this, we just create a new run with no inputs.
=== "Python"
```python
async for chunk in client.runs.stream(
thread["thread_id"],
assistant_id,
input=None,
stream_mode="values",
# highlight-next-line
command=Command(resume={"action": "continue"}),
stream_mode="updates",
):
if chunk.data and chunk.event != "metadata":
print(chunk.data)
@@ -294,8 +181,9 @@ To approve the tool call, we can just continue the thread with no edits. To do t
thread["thread_id"],
assistantId,
{
input: null,
streamMode: "values",
// highlight-next-line
command: { resume: { "action": "continue" } },
streamMode: "updates"
}
);
@@ -313,34 +201,21 @@ To approve the tool call, we can just continue the thread with no edits. To do t
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/runs/stream \
--header 'Content-Type: application/json' \
--data "{
\"assistant_id\": \"agent\"
}" | \
sed 's/\r$//' | \
awk '
/^event:/ {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
sub(/^event: /, "", $0)
event_type = $0
data_content = ""
}
/^data:/ {
sub(/^data: /, "", $0)
data_content = $0
}
END {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
}
'
\"assistant_id\": \"agent\",
\"command\": {
\"resume\": { \"action\": \"continue\"}
},
\"stream_mode\": [
\"updates\"
]
}"
```
Output:
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '54e19d6e-89fa-44fb-b92c-12e7dd4ddf08', 'example': False}, {'content': [{'text': "Certainly! I can help you check the weather in San Francisco. To get this information, I'll use the weather search function. Let me do that for you right away.", 'type': 'text', 'index': 0}, {'id': 'toolu_015yrR3GMDXe6X8m2p9CsEDN', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-45a6b6c3-ac69-42a4-8957-d982203d6392', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco'}, 'id': 'toolu_015yrR3GMDXe6X8m2p9CsEDN', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 360, 'output_tokens': 90, 'total_tokens': 450}}, {'content': 'Sunny!', 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'tool', 'name': 'weather_search', 'id': '826cd0f2-9cc6-46f0-b7df-daa6a05d13d2', 'tool_call_id': 'toolu_015yrR3GMDXe6X8m2p9CsEDN', 'artifact': None, 'status': 'success'}]}
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '54e19d6e-89fa-44fb-b92c-12e7dd4ddf08', 'example': False}, {'content': [{'text': "Certainly! I can help you check the weather in San Francisco. To get this information, I'll use the weather search function. Let me do that for you right away.", 'type': 'text', 'index': 0}, {'id': 'toolu_015yrR3GMDXe6X8m2p9CsEDN', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-45a6b6c3-ac69-42a4-8957-d982203d6392', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco'}, 'id': 'toolu_015yrR3GMDXe6X8m2p9CsEDN', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 360, 'output_tokens': 90, 'total_tokens': 450}}, {'content': 'Sunny!', 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'tool', 'name': 'weather_search', 'id': '826cd0f2-9cc6-46f0-b7df-daa6a05d13d2', 'tool_call_id': 'toolu_015yrR3GMDXe6X8m2p9CsEDN', 'artifact': None, 'status': 'success'}, {'content': [{'text': "\n\nGreat news! The weather in San Francisco is sunny today. It's a beautiful day in the city by the bay. Is there anything else you'd like to know about the weather or any other information I can help you with?", 'type': 'text', 'index': 0}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'end_turn', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-5d5fd0f1-a939-447e-801a-9aaa812322d3', 'example': False, 'tool_calls': [], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 464, 'output_tokens': 50, 'total_tokens': 514}}]}
{'human_review_node': None}
{'run_tool': {'messages': [{'role': 'tool', 'name': 'weather_search', 'content': 'Sunny!', 'tool_call_id': 'toolu_01142G3woscA8JjFTLdqymtn'}]}}
{'call_llm': {'messages': [{'content': "According to the search, it's sunny in San Francisco right now!", 'additional_kwargs': {}, 'response_metadata': {'id': 'msg_01JJE9AtT4a9Lob91RRiW9rU', 'model': 'claude-3-5-sonnet-20241022', 'stop_reason': 'end_turn', 'stop_sequence': None, 'usage': {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 458, 'output_tokens': 18}, 'model_name': 'claude-3-5-sonnet-20241022'}, 'type': 'ai', 'name': None, 'id': 'run-5e8d80b5-c46a-4aad-af37-b01f8bb15963-0', 'example': False, 'tool_calls': [], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 458, 'output_tokens': 18, 'total_tokens': 476, 'input_token_details': {'cache_read': 0, 'cache_creation': 0}}}]}}
## Edit Tool Call
@@ -355,7 +230,7 @@ Let's now say we want to edit the tool call. E.g. change some of the parameters
thread["thread_id"],
assistant_id,
input=input,
stream_mode="values",
stream_mode="updates",
):
if chunk.data and chunk.event != "metadata":
print(chunk.data)
@@ -371,7 +246,7 @@ Let's now say we want to edit the tool call. E.g. change some of the parameters
assistantId,
{
input: input,
streamMode: "values",
streamMode: "updates",
}
);
@@ -390,84 +265,35 @@ Let's now say we want to edit the tool call. E.g. change some of the parameters
--header 'Content-Type: application/json' \
--data "{
\"assistant_id\": \"agent\",
\"input\": {\"messages\": [{\"role\": \"human\", \"content\": \"what's the weather in sf?\"}]}
}" | \
sed 's/\r$//' | \
awk '
/^event:/ {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
sub(/^event: /, "", $0)
event_type = $0
data_content = ""
}
/^data:/ {
sub(/^data: /, "", $0)
data_content = $0
}
END {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
}
'
\"input\": {\"messages\": [{\"role\": \"human\", \"content\": \"what's the weather in sf?\"}]},
\"stream_mode\": [
\"updates\"
]
}"
```
Output:
To do this, we will use `Command` with a different resume value of `{"action": "update", "data": <tool call args>}`. This will do the following:
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': 'cec11391-84da-464b-bd2a-bd4f0d93b9ee', 'example': False}]}
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': 'cec11391-84da-464b-bd2a-bd4f0d93b9ee', 'example': False}, {'content': [{'text': 'To get the weather information for San Francisco, I can use the weather_search function. Let me do that for you.', 'type': 'text', 'index': 0}, {'id': 'toolu_01SunSpDurNfcnXppWLPrtjC', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-6326da9f-6061-4e12-8586-482e32ab4cab', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco'}, 'id': 'toolu_01SunSpDurNfcnXppWLPrtjC', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 360, 'output_tokens': 80, 'total_tokens': 440}}]}
To do this, we first need to update the state. We can do this by passing a message in with the **same** id of the message we want to overwrite. This will have the effect of **replacing** that old message. Note that this is only possible because of the **reducer** we are using that replaces messages with the same ID - read more about that [here](https://langchain-ai.github.io/langgraph/concepts/low_level/#working-with-messages-in-graph-state).
* combine existing tool call with user-provided tool call arguments and update the existing AI message with the new tool call
* navigate to `run_tool` node with the updated AI message and continue execution
=== "Python"
```python
# To get the ID of the message we want to replace, we need to fetch the current state and find it there.
state = await client.threads.get_state(thread['thread_id'])
print("Current State:")
print(state['values'])
print("\nCurrent Tool Call ID:")
current_content = state['values']['messages'][-1]['content']
current_id = state['values']['messages'][-1]['id']
tool_call_id = state['values']['messages'][-1]['tool_calls'][0]['id']
print(tool_call_id)
# highlight-next-line
from langgraph_sdk.schema import Command
# We now need to construct a replacement tool call.
# We will change the argument to be `San Francisco, USA`
# Note that we could change any number of arguments or tool names - it just has to be a valid one
new_message = {
"role": "assistant",
"content": current_content,
"tool_calls": [
{
"id": tool_call_id,
"name": "weather_search",
"args": {"city": "San Francisco, USA"}
}
],
# This is important - this needs to be the same as the message you replacing!
# Otherwise, it will show up as a separate message
"id": current_id
}
await client.threads.update_state(
# This is the config which represents this thread
thread['thread_id'],
# This is the updated value we want to push
{"messages": [new_message]},
# We push this update acting as our human_review_node
as_node="human_review_node"
)
print("\nResuming Execution")
# Let's now continue executing from here
async for chunk in client.runs.stream(
thread["thread_id"],
assistant_id,
input=None,
# highlight-next-line
command=Command(
# highlight-next-line
resume={"action": "update", "data": {"city": "San Francisco, USA"}}
# highlight-next-line
),
stream_mode="updates",
):
if chunk.data and chunk.event != "metadata":
print(chunk.data)
@@ -476,51 +302,21 @@ To do this, we first need to update the state. We can do this by passing a messa
=== "Javascript"
```js
const state = await client.threads.getState(thread.thread_id);
console.log("Current State:");
console.log(state.values);
console.log("\nCurrent Tool Call ID:");
const lastMessage = state.values.messages[state.values.messages.length - 1];
const currentContent = lastMessage.content;
const currentId = lastMessage.id;
const toolCallId = lastMessage.tool_calls[0].id;
console.log(toolCallId);
// Construct a replacement tool call
const newMessage = {
role: "assistant",
content: currentContent,
tool_calls: [
{
id: toolCallId,
name: "weather_search",
args: { city: "San Francisco, USA" }
}
],
// Ensure the ID is the same as the message you're replacing
id: currentId
};
await client.threads.updateState(
thread.thread_id, // Thread ID
{
values: { "messages": [newMessage] }, // Updated message
asNode: "human_review_node"
} // Acting as human_review_node
);
console.log("\nResuming Execution");
// Continue executing from here
const streamResponseResumed = client.runs.stream(
const streamResponse = client.runs.stream(
thread["thread_id"],
assistantId,
{
input: null,
// highlight-next-line
command: {
// highlight-next-line
resume: { "action": "update", "data": { "city": "San Francisco, USA" } }
// highlight-next-line
},
streamMode: "updates"
}
);
for await (const chunk of streamResponseResumed) {
for await (const chunk of streamResponse) {
if (chunk.data && chunk.event !== "metadata") {
console.log(chunk.data);
}
@@ -531,76 +327,37 @@ To do this, we first need to update the state. We can do this by passing a messa
```bash
curl --request POST \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/state \
--header 'Content-Type: application/json' \
--data "{
\"values\": { \"messages\": [$(curl --request GET \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/state |
jq -c '{
role: "assistant",
content: .values.messages[-1].content,
tool_calls: [
{
id: .values.messages[-1].tool_calls[0].id,
name: "weather_search",
args: { city: "San Francisco, USA" }
}
],
id: .values.messages[-1].id
}')
]},
\"as_node\": \"human_review_node\"
}" && echo "Resuming Execution" && curl --request POST \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/runs/stream \
--header 'Content-Type: application/json' \
--data '{
"assistant_id": "agent"
}' | \
sed 's/\r$//' | \
awk '
/^event:/ {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
sub(/^event: /, "", $0)
event_type = $0
data_content = ""
}
/^data:/ {
sub(/^data: /, "", $0)
data_content = $0
}
END {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
}
'
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/runs/stream \
--header 'Content-Type: application/json' \
--data "{
\"assistant_id\": \"agent\",
\"command\": {
\"resume\": { \"action\": \"update\", \"data\": { \"city\": \"San Francisco, USA\" } }
},
\"stream_mode\": [
\"updates\"
]
}"
```
Output:
Current State:
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '8713d1fa-9b26-4eab-b768-dafdaac70590', 'example': False}, {'content': [{'text': 'To get the weather information for San Francisco, I can use the weather_search function. Let me do that for you.', 'type': 'text', 'index': 0}, {'id': 'toolu_01VzagzsUGZsNMwW1wHkcw7h', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-ede13f26-daf5-4d8f-817a-7611075bbcf1', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco'}, 'id': 'toolu_01VzagzsUGZsNMwW1wHkcw7h', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 360, 'output_tokens': 80, 'total_tokens': 440}}]}
Current Tool Call ID:
toolu_01VzagzsUGZsNMwW1wHkcw7h
Resuming Execution
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '8713d1fa-9b26-4eab-b768-dafdaac70590', 'example': False}, {'content': [{'text': 'To get the weather information for San Francisco, I can use the weather_search function. Let me do that for you.', 'type': 'text', 'index': 0}, {'id': 'toolu_01VzagzsUGZsNMwW1wHkcw7h', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco"}'}], 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'ai', 'name': None, 'id': 'run-ede13f26-daf5-4d8f-817a-7611075bbcf1', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco, USA'}, 'id': 'toolu_01VzagzsUGZsNMwW1wHkcw7h', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': None}, {'content': 'Sunny!', 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'tool', 'name': 'weather_search', 'id': '7fc7d463-66bf-4555-9929-6af483de169b', 'tool_call_id': 'toolu_01VzagzsUGZsNMwW1wHkcw7h', 'artifact': None, 'status': 'success'}]}
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '8713d1fa-9b26-4eab-b768-dafdaac70590', 'example': False}, {'content': [{'text': 'To get the weather information for San Francisco, I can use the weather_search function. Let me do that for you.', 'type': 'text', 'index': 0}, {'id': 'toolu_01VzagzsUGZsNMwW1wHkcw7h', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco"}'}], 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'ai', 'name': None, 'id': 'run-ede13f26-daf5-4d8f-817a-7611075bbcf1', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco, USA'}, 'id': 'toolu_01VzagzsUGZsNMwW1wHkcw7h', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': None}, {'content': 'Sunny!', 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'tool', 'name': 'weather_search', 'id': '7fc7d463-66bf-4555-9929-6af483de169b', 'tool_call_id': 'toolu_01VzagzsUGZsNMwW1wHkcw7h', 'artifact': None, 'status': 'success'}, {'content': [{'text': "\n\nBased on the search result, the weather in San Francisco is sunny! It's a beautiful day in the city by the bay. Is there anything else you'd like to know about the weather or any other information I can help you with?", 'type': 'text', 'index': 0}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'end_turn', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-d90ce97a-39f9-4330-985e-67c5f351a0c5', 'example': False, 'tool_calls': [], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 455, 'output_tokens': 52, 'total_tokens': 507}}]}
{'human_review_node': {'messages': [{'role': 'ai', 'content': [{'text': "I'll help you check the weather in San Francisco.", 'type': 'text'}, {'id': 'toolu_016L4EDPcaQRzzZxiB4Wq2wa', 'input': {'city': 'San Francisco'}, 'name': 'weather_search', 'type': 'tool_use'}], 'tool_calls': [{'id': 'toolu_016L4EDPcaQRzzZxiB4Wq2wa', 'name': 'weather_search', 'args': {'city': 'San Francisco, USA'}}], 'id': 'run-b07f0c35-4e93-43a5-9b48-363767ada3ca-0'}]}}
{'run_tool': {'messages': [{'role': 'tool', 'name': 'weather_search', 'content': 'Sunny!', 'tool_call_id': 'toolu_016L4EDPcaQRzzZxiB4Wq2wa'}]}}
{'call_llm': {'messages': [{'content': "According to the search, it's sunny in San Francisco right now!", 'additional_kwargs': {}, 'response_metadata': {'id': 'msg_01De5HurjNUMwMUpfRtMLbX1', 'model': 'claude-3-5-sonnet-20241022', 'stop_reason': 'end_turn', 'stop_sequence': None, 'usage': {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 460, 'output_tokens': 18}, 'model_name': 'claude-3-5-sonnet-20241022'}, 'type': 'ai', 'name': None, 'id': 'run-85e2aaaa-6f61-4fa0-b594-b6e57129d7e7-0', 'example': False, 'tool_calls': [], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 460, 'output_tokens': 18, 'total_tokens': 478, 'input_token_details': {'cache_read': 0, 'cache_creation': 0}}}]}}
## Give feedback to a tool call
Sometimes, you may not want to execute a tool call, but you also may not want to ask the user to manually modify the tool call. In that case it may be better to get natural language feedback from the user. You can then insert these feedback as a mock **RESULT** of the tool call.
Sometimes, you may not want to execute a tool call, but you also may not want to ask the user to manually modify the tool call. In that case it may be better to get natural language feedback from the user. You can then insert this feedback as a mock **RESULT** of the tool call.
There are multiple ways to do this:
You could add a new message to the state (representing the "result" of a tool call)
You could add TWO new messages to the state - one representing an "error" from the tool call, other HumanMessage representing the feedback
Both are similar in that they involve adding messages to the state. The main difference lies in the logic AFTER the `human_node` and how it handles different types of messages.
1. You could add a new message to the state (representing the "result" of a tool call)
2. You could add TWO new messages to the state - one representing an "error" from the tool call, other HumanMessage representing the feedback
For this example we will just add a single tool call representing the feedback. Let's see this in action!
Both are similar in that they involve adding messages to the state. The main difference lies in the logic AFTER the `human_review_node` and how it handles different types of messages.
For this example we will just add a single tool call representing the feedback (see `human_review_node` implementation). Let's see this in action!
=== "Python"
@@ -611,6 +368,7 @@ For this example we will just add a single tool call representing the feedback.
thread["thread_id"],
assistant_id,
input=input,
stream_mode="updates",
):
if chunk.data and chunk.event != "metadata":
print(chunk.data)
@@ -626,6 +384,7 @@ For this example we will just add a single tool call representing the feedback.
assistantId,
{
input: input,
streamMode: "updates"
}
);
@@ -644,74 +403,35 @@ For this example we will just add a single tool call representing the feedback.
--header 'Content-Type: application/json' \
--data "{
\"assistant_id\": \"agent\",
\"input\": {\"messages\": [{\"role\": \"human\", \"content\": \"what's the weather in sf?\"}]}
}" | \
sed 's/\r$//' | \
awk '
/^event:/ {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
sub(/^event: /, "", $0)
event_type = $0
data_content = ""
}
/^data:/ {
sub(/^data: /, "", $0)
data_content = $0
}
END {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
}
'
\"input\": {\"messages\": [{\"role\": \"human\", \"content\": \"what's the weather in sf?\"}]},
\"stream_mode\": [
\"updates\"
]
}"
```
Output:
To do this, we will use `Command` with a different resume value of `{"action": "feedback", "data": <feedback string>}`. This will do the following:
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': 'c80f13d0-674d-4233-b6a0-3940509d3cf3', 'example': False}]}
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': 'c80f13d0-674d-4233-b6a0-3940509d3cf3', 'example': False}, {'content': [{'text': 'To get the weather information for San Francisco, I can use the weather_search function. Let me do that for you.', 'type': 'text', 'index': 0}, {'id': 'toolu_016XyTdFA8NuPWeLyZPSzoM3', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-4911ac27-3d7c-4edf-a3ca-c2908e3922eb', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco'}, 'id': 'toolu_016XyTdFA8NuPWeLyZPSzoM3', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 360, 'output_tokens': 80, 'total_tokens': 440}}]}
To do this, we first need to update the state. We can do this by passing a message in with the same **tool call id** of the tool call we want to respond to. Note that this is a **different*** ID from above
* create a new tool message that combines existing tool call from LLM with the with user-provided feedback as content
* navigate to `call_llm` node with the updated tool message and continue execution
=== "Python"
```python
# To get the ID of the message we want to replace, we need to fetch the current state and find it there.
state = await client.threads.get_state(thread['thread_id'])
print("Current State:")
print(state['values'])
print("\nCurrent Tool Call ID:")
tool_call_id = state['values']['messages'][-1]['tool_calls'][0]['id']
print(tool_call_id)
# highlight-next-line
from langgraph_sdk.schema import Command
# We now need to construct a replacement tool call.
# We will change the argument to be `San Francisco, USA`
# Note that we could change any number of arguments or tool names - it just has to be a valid one
new_message = {
"role": "tool",
# This is our natural language feedback
"content": "User requested changes: pass in the country as well",
"name": "weather_search",
"tool_call_id": tool_call_id
}
await client.threads.update_state(
# This is the config which represents this thread
thread['thread_id'],
# This is the updated value we want to push
{"messages": [new_message]},
# We push this update acting as our human_review_node
as_node="human_review_node"
)
print("\nResuming execution")
# Let's now continue executing from here
async for chunk in client.runs.stream(
thread["thread_id"],
assistant_id,
input=None,
stream_mode="values",
# highlight-next-line
command=Command(
resume={
"action": "feedback",
"data": "User requested changes: use <city, country> format for location"
}
),
stream_mode="updates",
):
if chunk.data and chunk.event != "metadata":
print(chunk.data)
@@ -720,133 +440,22 @@ To do this, we first need to update the state. We can do this by passing a messa
=== "Javascript"
```js
const state = await client.threads.getState(thread.thread_id);
console.log("Current State:");
console.log(state.values);
console.log("\nCurrent Tool Call ID:");
const lastMessage = state.values.messages[state.values.messages.length - 1];
const toolCallId = lastMessage.tool_calls[0].id;
console.log(toolCallId);
// Construct a replacement tool call
const newMessage = {
role: "tool",
content: "User requested changes: pass in the country as well",
name: "weather_search",
tool_call_id: toolCallId,
};
await client.threads.updateState(
thread.thread_id, // Thread ID
{
values: { "messages": [newMessage] }, // Updated message
asNode: "human_review_node"
} // Acting as human_review_node
);
console.log("\nResuming Execution");
// Continue executing from here
const streamResponseEdited = client.runs.stream(
const streamResponse = client.runs.stream(
thread["thread_id"],
assistantId,
{
input: null,
streamMode: "values",
interruptBefore: ["action"],
// highlight-next-line
command: {
resume: {
"action": "feedback",
"data": "User requested changes: use <city, country> format for location"
}
},
streamMode: "updates"
}
);
for await (const chunk of streamResponseEdited) {
if (chunk.data && chunk.event !== "metadata") {
console.log(chunk.data);
}
}
```
=== "CURL"
```bash
curl --request POST \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/state \
--header 'Content-Type: application/json' \
--data "{
\"values\": { \"messages\": [$(curl --request GET \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/state |
jq -c '{
role: "tool",
content: "User requested changes: pass in the country as well",
name: "get_weather",
tool_call_id: .values.messages[-1].id.tool_calls[0].id
}')
]},
\"as_node\": \"human_review_node\"
}" && echo "Resuming Execution" && curl --request POST \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/runs/stream \
--header 'Content-Type: application/json' \
--data '{
"assistant_id": "agent"
}' | \
sed 's/\r$//' | \
awk '
/^event:/ {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
sub(/^event: /, "", $0)
event_type = $0
data_content = ""
}
/^data:/ {
sub(/^data: /, "", $0)
data_content = $0
}
END {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
}
'
```
Output:
Current State:
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '3b2bbc38-d11b-49eb-80c0-c24a40dab5a8', 'example': False}, {'content': [{'text': 'To get the weather information for San Francisco, I can use the weather_search function. Let me do that for you.', 'type': 'text', 'index': 0}, {'id': 'toolu_01NNw18j57GEGPZvsa9f1wvX', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-c5a50900-abf5-4885-9cdb-da2bf0d892ac', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco'}, 'id': 'toolu_01NNw18j57GEGPZvsa9f1wvX', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 360, 'output_tokens': 80, 'total_tokens': 440}}]}
Current Tool Call ID:
toolu_01NNw18j57GEGPZvsa9f1wvX
Resuming execution
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '3b2bbc38-d11b-49eb-80c0-c24a40dab5a8', 'example': False}, {'content': [{'text': 'To get the weather information for San Francisco, I can use the weather_search function. Let me do that for you.', 'type': 'text', 'index': 0}, {'id': 'toolu_01NNw18j57GEGPZvsa9f1wvX', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-c5a50900-abf5-4885-9cdb-da2bf0d892ac', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco'}, 'id': 'toolu_01NNw18j57GEGPZvsa9f1wvX', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 360, 'output_tokens': 80, 'total_tokens': 440}}, {'content': 'User requested changes: pass in the country as well', 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'tool', 'name': 'weather_search', 'id': '787288be-213c-4fd3-8503-4a009bdb1b00', 'tool_call_id': 'toolu_01NNw18j57GEGPZvsa9f1wvX', 'artifact': None, 'status': 'success'}, {'content': [{'text': '\n\nI apologize for the oversight. It seems the function requires additional information. Let me try again with a more specific request.', 'type': 'text', 'index': 0}, {'id': 'toolu_01YAbLBoKozJyRQnB8LUMpXC', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco, USA"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-5c355a56-cfe3-4046-b49f-f5b09fc397ef', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco, USA'}, 'id': 'toolu_01YAbLBoKozJyRQnB8LUMpXC', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 461, 'output_tokens': 83, 'total_tokens': 544}}]}
We can see that we now get to another breakpoint - because it went back to the model and got an entirely new prediction of what to call. Let's now approve this one and continue
=== "Python"
```python
async for chunk in client.runs.stream(
thread["thread_id"],
assistant_id,
input=None,
):
if chunk.data and chunk.event != "metadata":
print(chunk.data)
```
=== "Javascript"
```js
const streamResponseResumed = client.runs.stream(
thread["thread_id"],
assistantId,
{
input: null,
}
);
for await (const chunk of streamResponseResumed) {
for await (const chunk of streamResponse) {
if (chunk.data && chunk.event !== "metadata") {
console.log(chunk.data);
}
@@ -860,31 +469,81 @@ We can see that we now get to another breakpoint - because it went back to the m
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/runs/stream \
--header 'Content-Type: application/json' \
--data "{
\"assistant_id\": \"agent\"
}" | \
sed 's/\r$//' | \
awk '
/^event:/ {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
sub(/^event: /, "", $0)
event_type = $0
data_content = ""
}
/^data:/ {
sub(/^data: /, "", $0)
data_content = $0
}
END {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
}
'
\"assistant_id\": \"agent\",
\"command\": {
\"resume\": { \"action\": \"feedback\", \"data\": \"User requested changes: use <city, country> format for location\" }
},
\"stream_mode\": [
\"updates\"
]
}"
```
Output:
{'human_review_node': {'messages': [{'role': 'tool', 'content': 'User requested changes: use <city, country> format for location', 'name': 'weather_search', 'tool_call_id': 'toolu_01RkPHCjpfoUvPAktaq4Cqhm'}]}}
{'call_llm': {'messages': [{'content': [{'text': 'Let me try that again with the correct format:', 'type': 'text'}, {'id': 'toolu_01Rdrag6cVufHZG26BwVaiE7', 'input': {'city': 'San Francisco, USA'}, 'name': 'weather_search', 'type': 'tool_use'}], 'additional_kwargs': {}, 'response_metadata': {'id': 'msg_01EBan969yY5f6iGk6sPgKcj', 'model': 'claude-3-5-sonnet-20241022', 'stop_reason': 'tool_use', 'stop_sequence': None, 'usage': {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 469, 'output_tokens': 68}, 'model_name': 'claude-3-5-sonnet-20241022'}, 'type': 'ai', 'name': None, 'id': 'run-64bbc255-d126-4db0-8ae5-3197cf29bed1-0', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco, USA'}, 'id': 'toolu_01Rdrag6cVufHZG26BwVaiE7', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 469, 'output_tokens': 68, 'total_tokens': 537, 'input_token_details': {'cache_read': 0, 'cache_creation': 0}}}]}}
{'__interrupt__': [{'value': {'question': 'Is this correct?', 'tool_call': {'name': 'weather_search', 'args': {'city': 'San Francisco, USA'}, 'id': 'toolu_01Rdrag6cVufHZG26BwVaiE7', 'type': 'tool_call'}}, 'resumable': True, 'ns': ['human_review_node:e9856878-e28c-5dd1-d353-4d83aa1a3a2b'], 'when': 'during'}]}
We can see that we now get to another interrupt - because it went back to the model and got an entirely new prediction of what to call. Let's now approve this one and continue.
=== "Python"
```python
# highlight-next-line
from langgraph_sdk.schema import Command
async for chunk in client.runs.stream(
thread["thread_id"],
assistant_id,
# highlight-next-line
command=Command(resume={"action": "continue"}),
stream_mode="updates",
):
if chunk.data and chunk.event != "metadata":
print(chunk.data)
```
=== "Javascript"
```js
const streamResponse = client.runs.stream(
thread["thread_id"],
assistantId,
{
// highlight-next-line
command: { resume: { "action": "continue" } },
streamMode: "updates"
}
);
for await (const chunk of streamResponse) {
if (chunk.data && chunk.event !== "metadata") {
console.log(chunk.data);
}
}
```
=== "CURL"
```bash
curl --request POST \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/runs/stream \
--header 'Content-Type: application/json' \
--data "{
\"assistant_id\": \"agent\",
\"command\": {
\"resume\": { \"action\": \"continue\"}
},
\"stream_mode\": [
\"updates\"
]
}"
```
Output:
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '3b2bbc38-d11b-49eb-80c0-c24a40dab5a8', 'example': False}, {'content': [{'text': 'To get the weather information for San Francisco, I can use the weather_search function. Let me do that for you.', 'type': 'text', 'index': 0}, {'id': 'toolu_01NNw18j57GEGPZvsa9f1wvX', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-c5a50900-abf5-4885-9cdb-da2bf0d892ac', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco'}, 'id': 'toolu_01NNw18j57GEGPZvsa9f1wvX', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 360, 'output_tokens': 80, 'total_tokens': 440}}, {'content': 'User requested changes: pass in the country as well', 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'tool', 'name': 'weather_search', 'id': '787288be-213c-4fd3-8503-4a009bdb1b00', 'tool_call_id': 'toolu_01NNw18j57GEGPZvsa9f1wvX', 'artifact': None, 'status': 'success'}, {'content': [{'text': '\n\nI apologize for the oversight. It seems the function requires additional information. Let me try again with a more specific request.', 'type': 'text', 'index': 0}, {'id': 'toolu_01YAbLBoKozJyRQnB8LUMpXC', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco, USA"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-5c355a56-cfe3-4046-b49f-f5b09fc397ef', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco, USA'}, 'id': 'toolu_01YAbLBoKozJyRQnB8LUMpXC', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 461, 'output_tokens': 83, 'total_tokens': 544}}, {'content': 'Sunny!', 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'tool', 'name': 'weather_search', 'id': '3b857482-bca2-4a73-a9ab-1f35a3e43e5f', 'tool_call_id': 'toolu_01YAbLBoKozJyRQnB8LUMpXC', 'artifact': None, 'status': 'success'}]}
{'messages': [{'content': "what's the weather in sf?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'human', 'name': None, 'id': '3b2bbc38-d11b-49eb-80c0-c24a40dab5a8', 'example': False}, {'content': [{'text': 'To get the weather information for San Francisco, I can use the weather_search function. Let me do that for you.', 'type': 'text', 'index': 0}, {'id': 'toolu_01NNw18j57GEGPZvsa9f1wvX', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-c5a50900-abf5-4885-9cdb-da2bf0d892ac', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco'}, 'id': 'toolu_01NNw18j57GEGPZvsa9f1wvX', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 360, 'output_tokens': 80, 'total_tokens': 440}}, {'content': 'User requested changes: pass in the country as well', 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'tool', 'name': 'weather_search', 'id': '787288be-213c-4fd3-8503-4a009bdb1b00', 'tool_call_id': 'toolu_01NNw18j57GEGPZvsa9f1wvX', 'artifact': None, 'status': 'success'}, {'content': [{'text': '\n\nI apologize for the oversight. It seems the function requires additional information. Let me try again with a more specific request.', 'type': 'text', 'index': 0}, {'id': 'toolu_01YAbLBoKozJyRQnB8LUMpXC', 'input': {}, 'name': 'weather_search', 'type': 'tool_use', 'index': 1, 'partial_json': '{"city": "San Francisco, USA"}'}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'tool_use', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-5c355a56-cfe3-4046-b49f-f5b09fc397ef', 'example': False, 'tool_calls': [{'name': 'weather_search', 'args': {'city': 'San Francisco, USA'}, 'id': 'toolu_01YAbLBoKozJyRQnB8LUMpXC', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 461, 'output_tokens': 83, 'total_tokens': 544}}, {'content': 'Sunny!', 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'tool', 'name': 'weather_search', 'id': '3b857482-bca2-4a73-a9ab-1f35a3e43e5f', 'tool_call_id': 'toolu_01YAbLBoKozJyRQnB8LUMpXC', 'artifact': None, 'status': 'success'}, {'content': [{'text': "\n\nGreat news! The weather in San Francisco is sunny today. Is there anything else you'd like to know about the weather or any other information I can help you with?", 'type': 'text', 'index': 0}], 'additional_kwargs': {}, 'response_metadata': {'stop_reason': 'end_turn', 'stop_sequence': None}, 'type': 'ai', 'name': None, 'id': 'run-6a857bb1-f65b-4b86-93d6-c025e003c777', 'example': False, 'tool_calls': [], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 557, 'output_tokens': 38, 'total_tokens': 595}}]}
{'human_review_node': None}
{'run_tool': {'messages': [{'role': 'tool', 'name': 'weather_search', 'content': 'Sunny!', 'tool_call_id': 'toolu_01Rdrag6cVufHZG26BwVaiE7'}]}}
{'call_llm': {'messages': [{'content': 'The weather in San Francisco is sunny!', 'additional_kwargs': {}, 'response_metadata': {'id': 'msg_013WTDHhbg8WiYLiQ9n2CaTk', 'model': 'claude-3-5-sonnet-20241022', 'stop_reason': 'end_turn', 'stop_sequence': None, 'usage': {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 550, 'output_tokens': 12}, 'model_name': 'claude-3-5-sonnet-20241022'}, 'type': 'ai', 'name': None, 'id': 'run-b6c815f0-989a-47cf-b150-33e3bbc4eab7-0', 'example': False, 'tool_calls': [], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 550, 'output_tokens': 12, 'total_tokens': 562, 'input_token_details': {'cache_read': 0, 'cache_creation': 0}}}]}}
@@ -1,16 +1,16 @@
# How to Wait for User Input
# How to wait for user input using `interrupt`
One of the main human-in-the-loop interaction patterns is waiting for human input. A key use case involves asking the user clarifying questions. One way to accomplish this is simply go to the `END` node and exit the graph. Then, any user response comes back in as fresh invocation of the graph. This is basically just creating a chatbot architecture.
!!! tip "Prerequisites"
The issue with this is it is tough to resume back in a particular point in the graph. Often times the agent is halfway through some process, and just needs a bit of a user input. Although it is possible to design your graph in such a way where you have a `conditional_entry_point` to route user messages back to the right place, that is not super scalable (as it essentially involves having a routing function that can end up almost anywhere).
This guide assumes familiarity with the following concepts:
A separate way to do this is to have a node explicitly for getting user input. This is easy to implement in a notebook setting - you just put an `input()` call in the node. But that isn't exactly production ready.
* [Human-in-the-loop](../../concepts/human_in_the_loop.md)
* [LangGraph Glossary](../../concepts/low_level.md)
Luckily, LangGraph makes it possible to do similar things in a production way. The basic idea is:
**Human-in-the-loop (HIL)** interactions are crucial for [agentic systems](../../concepts/agentic_concepts.md#human-in-the-loop). Waiting for human input is a common HIL interaction pattern, allowing the agent to ask the user clarifying questions and await input before proceeding.
- Set up a node that represents human input. This can have specific incoming/outgoing edges (as you desire). There shouldn't actually be any logic inside this node.
- Add a breakpoint before the node. This will stop the graph before this node executes (which is good, because there's no real logic in it anyways)
- Use `.update_state` to update the state of the graph. Pass in whatever human response you get. The key here is to use the `as_node` parameter to apply this update **as if you were that node**. This will have the effect of making it so that when you resume execution next it resumes as if that node just acted, and not from the beginning.
We can implement this in LangGraph using the [`interrupt()`][langgraph.types.interrupt] function. `interrupt` allows us to stop graph execution to collect input from a user and continue execution with collected input.
## Setup
@@ -54,7 +54,7 @@ First, we need to setup our client so that we can communicate with our hosted gr
### Initial invocation
Now, let's invoke our graph by interrupting before `ask_human` node:
Now, let's invoke our graph.
=== "Python"
@@ -73,7 +73,6 @@ Now, let's invoke our graph by interrupting before `ask_human` node:
assistant_id,
input=input,
stream_mode="updates",
interrupt_before=["ask_human"],
):
if chunk.data and chunk.event != "metadata":
print(chunk.data)
@@ -95,7 +94,6 @@ Now, let's invoke our graph by interrupting before `ask_human` node:
{
input: input,
streamMode: "updates",
interruptBefore: ["ask_human"]
}
);
@@ -115,117 +113,34 @@ Now, let's invoke our graph by interrupting before `ask_human` node:
--data "{
\"assistant_id\": \"agent\",
\"input\": {\"messages\": [{\"role\": \"human\", \"content\": \"Ask the user where they are, then look up the weather there\"}]},
\"interrupt_before\": [\"ask_human\"],
\"stream_mode\": [
\"updates\"
]
}" | \
sed 's/\r$//' | \
awk '
/^event:/ {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
sub(/^event: /, "", $0)
event_type = $0
data_content = ""
}
/^data:/ {
sub(/^data: /, "", $0)
data_content = $0
}
END {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
}
'
}"
```
Output:
{'agent': {'messages': [{'content': [{'text': "Certainly! I'll use the AskHuman function to ask the user about their location, and then I'll use the search function to look up the weather for that location. Let's start by asking the user where they are.", 'type': 'text'}, {'id': 'toolu_01RFahzYPvnPWTb2USk2RdKR', 'input': {'question': 'Where are you currently located?'}, 'name': 'AskHuman', 'type': 'tool_use'}], 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'ai', 'name': None, 'id': 'run-a8422215-71d3-4093-afb4-9db141c94ddb', 'example': False, 'tool_calls': [{'name': 'AskHuman', 'args': {'question': 'Where are you currently located?'}, 'id': 'toolu_01RFahzYPvnPWTb2USk2RdKR'}], 'invalid_tool_calls': [], 'usage_metadata': None}]}}
{'agent': {'messages': [{'content': [{'text': "I'll help you ask the user about their location and then search for weather information.", 'type': 'text'}, {'id': 'toolu_012JeNEvyePZFWK39d52Wdwi', 'input': {'question': 'Where are you located?'}, 'name': 'AskHuman', 'type': 'tool_use'}], 'additional_kwargs': {}, 'response_metadata': {'id': 'msg_01UBEdS6UvuFMetdokNsykVG', 'model': 'claude-3-5-sonnet-20241022', 'stop_reason': 'tool_use', 'stop_sequence': None, 'usage': {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 438, 'output_tokens': 76}, 'model_name': 'claude-3-5-sonnet-20241022'}, 'type': 'ai', 'name': None, 'id': 'run-1b1210d8-39e0-4607-9f0e-0ea932d28d5c-0', 'example': False, 'tool_calls': [{'name': 'AskHuman', 'args': {'question': 'Where are you located?'}, 'id': 'toolu_012JeNEvyePZFWK39d52Wdwi', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 438, 'output_tokens': 76, 'total_tokens': 514, 'input_token_details': {'cache_read': 0, 'cache_creation': 0}}}]}}
{'__interrupt__': [{'value': 'Where are you located?', 'resumable': True, 'ns': ['ask_human:2d41f894-f297-211e-9bfe-1d162ecba54a'], 'when': 'during'}]}
You can see that our graph got interrupted inside the `ask_human` node, which is now waiting for a `location` to be provided.
### Adding user input to state
We now want to update this thread with a response from the user. We then can kick off another run.
Because we are treating this as a tool call, we will need to update the state as if it is a response from a tool call. In order to do this, we will need to check the state to get the ID of the tool call.
### Providing human input
We can provide human input (`location`) by invoking the graph with a `Command(resume="<location>")`:
=== "Python"
```python
state = await client.threads.get_state(thread['thread_id'])
tool_call_id = state['values']['messages'][-1]['tool_calls'][0]['id']
# highlight-next-line
from langgraph_sdk.schema import Command
# We now create the tool call with the id and the response we want
tool_message = [{"tool_call_id": tool_call_id, "type": "tool", "content": "san francisco"}]
await client.threads.update_state(thread['thread_id'], {"messages": tool_message}, as_node="ask_human")
```
=== "Javascript"
```js
const state = await client.threads.getState(thread["thread_id"]);
const toolCallId = state.values.messages[state.values.messages.length - 1].tool_calls[0].id;
// We now create the tool call with the id and the response we want
const toolMessage = [
{
tool_call_id: toolCallId,
type: "tool",
content: "san francisco"
}
];
await client.threads.updateState(
thread["thread_id"],
{ values: { messages: toolMessage } },
{ asNode: "ask_human" }
);
```
=== "CURL"
```bash
curl --request GET \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/state \
| jq -r '.values.messages[-1].tool_calls[0].id' \
| sh -c '
TOOL_CALL_ID="$1"
# Construct the JSON payload
JSON_PAYLOAD=$(printf "{\"messages\": [{\"tool_call_id\": \"%s\", \"type\": \"tool\", \"content\": \"san francisco\"}], \"as_node\": \"ask_human\"}" "$TOOL_CALL_ID")
# Send the updated state
curl --request POST \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/state \
--header "Content-Type: application/json" \
--data "${JSON_PAYLOAD}"
' _
```
Output:
{'configurable': {'thread_id': 'a9f322ae-4ed1-41ec-942b-38cb3d342c3a',
'checkpoint_ns': '',
'checkpoint_id': '1ef58e97-a623-63dd-8002-39a9a9b20be3'}}
### Invoking after receiving human input
We can now tell the agent to continue. We can just pass in None as the input to the graph, since no additional input is needed:
=== "Python"
```python
async for chunk in client.runs.stream(
thread["thread_id"],
assistant_id,
input=None,
# highlight-next-line
command=Command(resume="san francisco"),
stream_mode="updates",
):
if chunk.data and chunk.event != "metadata":
@@ -238,7 +153,8 @@ We can now tell the agent to continue. We can just pass in None as the input to
thread["thread_id"],
assistantId,
{
input: null,
// highlight-next-line
command: { resume: "san francisco" },
streamMode: "updates"
}
);
@@ -253,40 +169,23 @@ We can now tell the agent to continue. We can just pass in None as the input to
=== "CURL"
```bash
curl --request POST \
curl --request POST \
--url <DEPLOYMENT_URL>/threads/<THREAD_ID>/runs/stream \
--header 'Content-Type: application/json' \
--data "{
\"assistant_id\": \"agent\",
\"command\": {
\"resume\": \"san francisco\"
},
\"stream_mode\": [
\"updates\"
]
}"| \
sed 's/\r$//' | \
awk '
/^event:/ {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
sub(/^event: /, "", $0)
event_type = $0
data_content = ""
}
/^data:/ {
sub(/^data: /, "", $0)
data_content = $0
}
END {
if (data_content != "" && event_type != "metadata") {
print data_content "\n"
}
}
'
}"
```
Output:
{'agent': {'messages': [{'content': [{'text': "Thank you for letting me know that you're in San Francisco. Now, I'll use the search function to look up the weather in San Francisco.", 'type': 'text'}, {'id': 'toolu_01K57ofmgG2wyJ8tYJjbq5k7', 'input': {'query': 'current weather in San Francisco'}, 'name': 'search', 'type': 'tool_use'}], 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'ai', 'name': None, 'id': 'run-241baed7-db5e-44ce-ac3c-56431705c22b', 'example': False, 'tool_calls': [{'name': 'search', 'args': {'query': 'current weather in San Francisco'}, 'id': 'toolu_01K57ofmgG2wyJ8tYJjbq5k7'}], 'invalid_tool_calls': [], 'usage_metadata': None}]}}
{'action': {'messages': [{'content': '["I looked up: current weather in San Francisco. Result: It\'s sunny in San Francisco, but you better look out if you\'re a Gemini 😈."]', 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'tool', 'name': 'search', 'id': '8b699b95-8546-4557-8e66-14ea71a15ed8', 'tool_call_id': 'toolu_01K57ofmgG2wyJ8tYJjbq5k7'}]}}
{'agent': {'messages': [{'content': "Based on the search results, I can provide you with information about the current weather in San Francisco:\n\nThe weather in San Francisco is currently sunny. It's a beautiful day in the city! \n\nHowever, I should note that the search result included an unusual comment about Gemini zodiac signs. This appears to be either a joke or potentially irrelevant information added by the search engine. For accurate and detailed weather information, you might want to check a reliable weather service or app for San Francisco.\n\nIs there anything else you'd like to know about the weather or San Francisco?", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'ai', 'name': None, 'id': 'run-b4d7309f-f849-46aa-b6ef-475bcabd2be9', 'example': False, 'tool_calls': [], 'invalid_tool_calls': [], 'usage_metadata': None}]}}
{'ask_human': {'messages': [{'tool_call_id': 'toolu_012JeNEvyePZFWK39d52Wdwi', 'type': 'tool', 'content': 'san francisco'}]}}
{'agent': {'messages': [{'content': [{'text': 'Let me search for the weather in San Francisco.', 'type': 'text'}, {'id': 'toolu_019f9Y7ST6rNeDQkDjFCHk6C', 'input': {'query': 'current weather in san francisco'}, 'name': 'search', 'type': 'tool_use'}], 'additional_kwargs': {}, 'response_metadata': {'id': 'msg_0152YFm7DtnzfZQuiMUzaSsw', 'model': 'claude-3-5-sonnet-20241022', 'stop_reason': 'tool_use', 'stop_sequence': None, 'usage': {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 527, 'output_tokens': 67}, 'model_name': 'claude-3-5-sonnet-20241022'}, 'type': 'ai', 'name': None, 'id': 'run-f509b5b2-eb30-4200-a8da-fa79ed68812a-0', 'example': False, 'tool_calls': [{'name': 'search', 'args': {'query': 'current weather in san francisco'}, 'id': 'toolu_019f9Y7ST6rNeDQkDjFCHk6C', 'type': 'tool_call'}], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 527, 'output_tokens': 67, 'total_tokens': 594, 'input_token_details': {'cache_read': 0, 'cache_creation': 0}}}]}}
{'action': {'messages': [{'content': "I looked up: current weather in san francisco. Result: It's sunny in San Francisco, but you better look out if you're a Gemini 😈.", 'additional_kwargs': {}, 'response_metadata': {}, 'type': 'tool', 'name': 'search', 'id': 'cbd0f623-cc12-48a2-8c18-3cbb943e46e0', 'tool_call_id': 'toolu_019f9Y7ST6rNeDQkDjFCHk6C', 'artifact': None, 'status': 'success'}]}}
{'agent': {'messages': [{'content': "Based on the search results, it's currently sunny in San Francisco. Would you like any specific details about the weather forecast?", 'additional_kwargs': {}, 'response_metadata': {'id': 'msg_01FhzXj72CehBYkJGX69vsBc', 'model': 'claude-3-5-sonnet-20241022', 'stop_reason': 'end_turn', 'stop_sequence': None, 'usage': {'cache_creation_input_tokens': 0, 'cache_read_input_tokens': 0, 'input_tokens': 639, 'output_tokens': 29}, 'model_name': 'claude-3-5-sonnet-20241022'}, 'type': 'ai', 'name': None, 'id': 'run-f48e818e-dd88-415e-9a0b-4a958498b553-0', 'example': False, 'tool_calls': [], 'invalid_tool_calls': [], 'usage_metadata': {'input_tokens': 639, 'output_tokens': 29, 'total_tokens': 668, 'input_token_details': {'cache_read': 0, 'cache_creation': 0}}}]}}
@@ -1,4 +1,4 @@
# Interrupt
# How to use the interrupt option
This guide assumes knowledge of what double-texting is, which you can learn about in the [double-texting conceptual guide](../../concepts/double_texting.md).
@@ -119,11 +119,11 @@ With this set up, running your graph and viewing in LangGraph Studio will result
**Note the configuration icon in the top right corner of the `call_model` node**:
![Graph in Studio](../img/studio_graph_with_configuration.png){width=1200}
![Graph in Studio](img/studio_graph_with_configuration.png){width=1200}
Clicking this icon will open a modal where you can edit the configuration for all of the fields associated with the `call_model` node. From here, you can save your changes and apply them to the graph. Note that these values reflect the currently active assistant, and saving will update the assistant with the new values.
![Configuration modal](../img/studio_node_configuration.png){width=1200}
![Configuration modal](img/studio_node_configuration.png){width=1200}
### Playground
@@ -133,7 +133,7 @@ LangGraph Studio also supports prompt engineering through an integration with th
2. Within the thread log, any nodes that have made an LLM call will have a "View LLM Runs" button. Clicking this will open a popover with the LLM runs for that node.
3. Select the LLM run you want to edit. This will open the LangSmith Playground with the selected LLM run.
![Playground in Studio](../img/studio_playground.png){width=1200}
![Playground in Studio](img/studio_playground.png){width=1200}
From here you can edit the prompt, test different model configurations and re-run just this LLM call without having to re-run the entire graph. When you are happy with your changes, you can copy the updated prompt back into your graph.
@@ -1,4 +1,5 @@
# Rollback
# How to use the Rollback option
This guide assumes knowledge of what double-texting is, which you can learn about in the [double-texting conceptual guide](../../concepts/double_texting.md).
+1 -1
View File
@@ -1,7 +1,7 @@
# How to stream events
!!! info "Prerequisites"
* [Streaming](../../concepts/streaming.md#streaming-llm-tokens-and-events-astream_events)
* [Streaming](../../concepts/streaming.md#streaming-graph-outputs-stream-and-astream)
This guide covers how to stream events from your graph (`stream_mode="events"`). Depending on the use case and user experience of your LangGraph application, your application may process event types differently.
@@ -1,7 +1,7 @@
# LangGraph Studio With Local Deployment
!!! warning "Browser Compatibility"
Viewing the studio page of a local LangGraph deployment does not work in Safari. Use Chrome instead.
Safari blocks `localhost` connections to Studio. To work around this, start the server with `--tunnel` and youll be able to access Studio from Safari via a secure tunnel.
## Setup
+1 -1
View File
@@ -476,7 +476,7 @@ The `useStream()` hook provides several callback options to help you respond to
- `onError`: Called when an error occurs.
- `onFinish`: Called when the stream is finished.
- `onUpdateEvent`: Called when an update event is received.
- `onCustomEvent`: Called when a custom event is received. See [Custom events](../../concepts/streaming.md#custom) to learn how to stream custom events.
- `onCustomEvent`: Called when a custom event is received. See [Custom events](../../how-tos/streaming.ipynb#custom) to learn how to stream custom events.
- `onMetadataEvent`: Called when a metadata event is received, which contains the Run ID and Thread ID.
## Learn More
File diff suppressed because it is too large Load Diff
@@ -3,7 +3,7 @@
"info": {
"title": "LangGraph Control Plane API (Beta)",
"version": "0.0.1",
"description": "The LangGraph Control Plane API is used to programmatically create and manage LangGraph Server deployments. For example, the APIs can be orchestrated to create custom CI/CD workflows.\n\n### Beta\nThis API is currently in beta and may change or break without notice. This API documentation may not be up-to-date with actual API functionality.\n### Host\nhttps://api.host.langchain.com/\n\n### Authentication\nTo authenticate with the LangGraph Control Plane API, set the `X-Api-Key` header to a valid LangSmith API key for each request.\n\n### Versioning\nEach endpoint path is prefixed with a version (e.g. `v1`).\n\n### Quick Start\n\n1. Call `GET /{version}/projects` to retrieve the `Project` `id`. The `Project` `id` is needed in subsequent API calls.\n2. Call `POST /{version}/projects/{project_id}/revisions` to create a new `Revision` for the `Project`.\n3. Call `GET /{version}/projects/{project_id}/revisions` to get the latest `Revision` (first element in returned list). Get the `Revision` `id`.\n4. Poll for `Revision` `status` until `status` is `DEPLOYED` by calling `GET /{version}/projects/{project_id}/revisions/{revision_id}`."
"description": "The LangGraph Control Plane API is used to programmatically create and manage LangGraph Server deployments. For example, the APIs can be orchestrated to create custom CI/CD workflows.\n\n### Beta\nThis API is currently in beta and may change or break without notice. This API documentation may not be up-to-date with actual API functionality.\n### Host\nhttps://api.host.langchain.com/\n\n### Authentication\nTo authenticate with the LangGraph Control Plane API, set the `X-Api-Key` header to a valid LangSmith API key for each request.\n\n### Versioning\nEach endpoint path is prefixed with a version (e.g. `v1`).\n\n### Quick Start\n\n1. Call `POST /{version}/projects` to create a new `Project`.\n2. Call `GET /{version}/projects` to retrieve the `Project` `id`. The `Project` `id` is needed in subsequent API calls.\n3. Call `POST /{version}/projects/{project_id}/revisions` to create a new `Revision` for the `Project`.\n4. Call `GET /{version}/projects/{project_id}/revisions` to get the latest `Revision` (first element in returned list). Get the `Revision` `id`.\n5. Poll for `Revision` `status` until `status` is `DEPLOYED` by calling `GET /{version}/projects/{project_id}/revisions/{revision_id}`."
},
"servers": [
{
@@ -22,6 +22,34 @@
],
"paths": {
"/v1/projects": {
"post": {
"tags": ["Projects (v1)"],
"summary": "Create Project",
"description": "Create a new project.",
"operationId": "create_project_projects_post",
"requestBody": {
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/CreateProjectRequest"
}
}
},
"required": true
},
"responses": {
"200": {
"description": "Success",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/Project"
}
}
}
}
}
},
"get": {
"tags": ["Projects (v1)"],
"summary": "List Projects",
@@ -397,6 +425,83 @@
}
}
},
"CreateProjectRequest":{
"type": "object",
"description": "Object for creating a new project.",
"properties": {
"name": {
"type": "string",
"description": "Name of the project.",
"required": true
},
"lc_hosted": {
"type": "boolean",
"description": "Whether the project is hosted on LangChain's cloud (i.e. Cloud SaaS deployment option). Set to `false` for Self-Hosted Data Plane and Self-Hosted Control Plane deployment options.",
"default": true
},
"repo_url": {
"type": ["string", "null"],
"description": "URL of the GitHub repository to use for the project. Omit this field if creating a new project from a Docker image.",
"default": "null"
},
"repo_path": {
"type": ["string", "null"],
"description": "Path to `langgraph.json` configuration file. For example, `langgraph.json` or `src/langgraph.json`.\n\nIf this field is omitted or set to `null`, the previous revision's `repo_path` value is used. Set this field for deployments from a GitHub repository. Omit this field if creating a new revision from a Docker image.",
"default": "null"
},
"repo_commit": {
"type": ["string", "null"],
"description": "Git branch name of deployment.\n\nThis field only applies to deployments from a GitHub repository.",
"default": "null"
},
"env_vars": {
"type": "array",
"description": "List of environment variables or secrets.\n\nIf this field is omitted or set to `null`, the previous revision's `env_vars` value is used.",
"items": {
"$ref": "#/components/schemas/EnvVar"
},
"default": "null"
},
"host_integration_id": {
"type": ["string", "null"],
"format": "uuid",
"description": "Do not use."
},
"deployment_type": {
"type": "string",
"description": "Development (`dev`) or Production (`prod`) type deployment.",
"enum": [
"dev",
"prod"
]
},
"shareable": {
"type": ["boolean", "null"],
"description": "Boolean flag to configure if a deployment is shareable through LangGraph Studio.\n\nIf this field is omitted or set to `null`, the previous revision's `shareable` value is used. This field does not apply to BYOC deployments.",
"default": "null"
},
"platform": {
"type": "object",
"description": "Do not use.",
"default": "null"
},
"image_path": {
"type": ["string", "null"],
"description": "URI of the Docker image to deploy.\n\nIf this field is omitted or set to `null`, the previous revision's `image_path` value is used. Set this field for BYOC deployments. Omit this field if creating a new revision from a GitHub repository.",
"default": "null"
},
"build_on_push": {
"type": "boolean",
"description": "Boolean flag to indicate if a new revision is automatically created on push to GitHub branch (`repo_branch`).\n\nThis field does not apply for BYOC deployments.",
"default": false
},
"container_spec": {
"description": "If this field is omitted or set to `null`, the previous revision's `container_spec` value is used.",
"$ref": "#/components/schemas/ContainerSpec",
"default": "null"
}
}
},
"CreateRevisionRequest": {
"type": "object",
"description": "Object for creating a new revision.",
+13 -4
View File
@@ -10,9 +10,6 @@ The LangGraph command line interface includes commands to build and run a LangGr
=== "Python"
```bash
pip install langgraph-cli
# Install via Homebrew
brew install langgraph-cli
```
=== "JS"
@@ -45,14 +42,16 @@ The LangGraph CLI requires a JSON configuration file that follows this [schema](
| <span style="white-space: nowrap;">`dependencies`</span> | **Required**. Array of dependencies for LangGraph Cloud API server. Dependencies can be one of the following: <ul><li>A single period (`"."`), which will look for local Python packages.</li><li>The directory path where `pyproject.toml`, `setup.py` or `requirements.txt` is located.</br></br>For example, if `requirements.txt` is located in the root of the project directory, specify `"./"`. If it's located in a subdirectory called `local_package`, specify `"./local_package"`. Do not specify the string `"requirements.txt"` itself.</li><li>A Python package name.</li></ul> |
| <span style="white-space: nowrap;">`graphs`</span> | **Required**. Mapping from graph ID to path where the compiled graph or a function that makes a graph is defined. Example: <ul><li>`./your_package/your_file.py:variable`, where `variable` is an instance of `langgraph.graph.state.CompiledStateGraph`</li><li>`./your_package/your_file.py:make_graph`, where `make_graph` is a function that takes a config dictionary (`langchain_core.runnables.RunnableConfig`) and creates an instance of `langgraph.graph.state.StateGraph` / `langgraph.graph.state.CompiledStateGraph`.</li></ul> |
| <span style="white-space: nowrap;">`auth`</span> | _(Added in v0.0.11)_ Auth configuration containing the path to your authentication handler. Example: `./your_package/auth.py:auth`, where `auth` is an instance of `langgraph_sdk.Auth`. See [authentication guide](../../concepts/auth.md) for details. |
| <span style="white-space: nowrap;">`base_image`</span> | Optional. Base image to use for the LangGraph API server. Defaults to `langchain/langgraph-api` or `langchain/langgraphjs-api`. Use this to pin your builds to a particular version of the langgraph API, such as `"langchain/langgraph-server:0.2"`. See https://hub.docker.com/r/langchain/langgraph-server/tags for more details. (added in `langgraph-cli==0.2.8`) |
| <span style="white-space: nowrap;">`env`</span> | Path to `.env` file or a mapping from environment variable to its value. |
| <span style="white-space: nowrap;">`store`</span> | Configuration for adding semantic search and/or time-to-live (TTL) to the BaseStore. Contains the following fields: <ul><li>`index` (optional): Configuration for semantic search indexing with fields `embed`, `dims`, and optional `fields`.</li><li>`ttl` (optional): Configuration for item expiration. An object with optional fields: `refresh_on_read` (boolean, defaults to `true`), `default_ttl` (float, lifespan in **minutes**, defaults to no expiration), and `sweep_interval_minutes` (integer, how often to check for expired items, defaults to no sweeping).</li></ul> |
| <span style="white-space: nowrap;">`ui`</span> | Optional. Named definitions of UI components emitted by the agent, each pointing to a JS/TS file. (added in `langgraph-cli==0.1.84`) |
| <span style="white-space: nowrap;">`python_version`</span> | `3.11`, `3.12`, or `3.13`. Defaults to `3.11`. |
| <span style="white-space: nowrap;">`node_version`</span> | Specify `node_version: 20` to use LangGraph.js. |
| <span style="white-space: nowrap;">`pip_config_file`</span> | Path to `pip` config file. |
| <span style="white-space: nowrap;">`dockerfile_lines`</span> | Array of additional lines to add to Dockerfile following the import from parent image. |
| <span style="white-space: nowrap;">`checkpointer`</span> | Configuration for the checkpointer. Contains a `ttl` field which is an object with the following keys: <ul><li>`strategy`: How to handle expired checkpoints (e.g., `"delete"`).</li><li>`sweep_interval_minutes`: How often to check for expired checkpoints (integer).</li><li>`default_ttl`: Default time-to-live for checkpoints in **minutes** (integer). Defines how long checkpoints are kept before the specified strategy is applied.</li></ul> |
| <span style="white-space: nowrap;">`http`</span> | HTTP server configuration with the following fields: <ul><li>`app`: Path to custom Starlette/FastAPI app (e.g., `"./src/agent/webapp.py:app"`). See [custom routes guide](../../how-tos/http/custom_routes.md).</li><li>`disable_assistants`: Disable `/assistants` routes</li><li>`disable_threads`: Disable `/threads` routes</li><li>`disable_runs`: Disable `/runs` routes</li><li>`disable_store`: Disable `/store` routes</li><li>`disable_meta`: Disable `/ok`, `/info`, `/metrics`, and `/docs` routes</li><li>`cors`: CORS configuration with fields for `allow_origins`, `allow_methods`, `allow_headers`, etc.</li></ul> |
| <span style="white-space: nowrap;">`http`</span> | HTTP server configuration with the following fields: <ul><li>`app`: Path to custom Starlette/FastAPI app (e.g., `"./src/agent/webapp.py:app"`). See [custom routes guide](../../how-tos/http/custom_routes.md).</li><li>`disable_assistants`: Disable `/assistants` routes</li><li>`disable_threads`: Disable `/threads` routes</li><li>`disable_runs`: Disable `/runs` routes</li><li>`disable_store`: Disable `/store` routes</li><li>`disable_meta`: Disable `/ok`, `/info`, `/metrics`, and `/docs` routes</li><li>`cors`: CORS configuration with fields for `allow_origins`, `allow_methods`, `allow_headers`, etc.</li><li>`configurable_headers`: Define which request headers to exclude or include as a run's configurable values.</li></ul> |
=== "JS"
@@ -298,6 +297,11 @@ The LangGraph CLI requires a JSON configuration file that follows this [schema](
| `--no-reload` | | Disable auto-reload |
| `--n-jobs-per-worker INTEGER` | | Number of jobs per worker. Default is 10 |
| `--debug-port INTEGER` | | Port for debugger to listen on |
| `--wait-for-client` | `False` | Wait for a debugger client to connect to the debug port before starting the server |
| `--no-browser` | | Skip automatically opening the browser when the server starts |
| `--studio-url TEXT` | | URL of the LangGraph Studio instance to connect to. Defaults to https://smith.langchain.com |
| `--allow-blocking` | `False` | Do not raise errors for synchronous I/O blocking operations in your code (added in `0.2.6`) |
| `--tunnel` | `False` | Expose the local server via a public tunnel (Cloudflare) for remote frontend access. This avoids issues with browsers like Safari or networks blocking localhost connections |
| `--help` | | Display command documentation |
@@ -321,6 +325,11 @@ The LangGraph CLI requires a JSON configuration file that follows this [schema](
| `--no-reload` | | Disable auto-reload |
| `--n-jobs-per-worker INTEGER` | | Number of jobs per worker. Default is 10 |
| `--debug-port INTEGER` | | Port for debugger to listen on |
| `--wait-for-client` | `False` | Wait for a debugger client to connect to the debug port before starting the server |
| `--no-browser` | | Skip automatically opening the browser when the server starts |
| `--studio-url TEXT` | | URL of the LangGraph Studio instance to connect to. Defaults to https://smith.langchain.com |
| `--allow-blocking` | `False` | Do not raise errors for synchronous I/O blocking operations in your code |
| `--tunnel` | `False` | Expose the local server via a public tunnel (Cloudflare) for remote frontend access. This avoids issues with browsers or networks blocking localhost connections |
| `--help` | | Display command documentation |
### `build`
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@@ -55,6 +55,14 @@ Set `LANGSMITH_TRACING` to `false` to disable tracing to LangSmith.
Configure [log level](https://docs.python.org/3/library/logging.html#logging-levels). Defaults to `INFO`.
## `LOG_JSON`
Set `LOG_JSON` to `true` to render all log messages as JSON objects using the configured `JSONRenderer`. This produces structured logs that can be easily parsed or ingested by log management systems. Defaults to `false`.
## `LOG_COLOR`
This is mainly relevant in the context of using the dev server via the `langgraph dev` command. Set `LOG_COLOR` to `true` to enable ANSI-colored console output when using the default console renderer. Disabling color output by setting this variable to `false` produces monochrome logs. Defaults to `true`.
## `N_JOBS_PER_WORKER`
Number of jobs per worker for the LangGraph Server task queue. Defaults to `10`.
@@ -83,9 +91,31 @@ Database Connectivity:
- The custom Postgres instance must be accessible by the LangGraph Server. The user is responsible for ensuring connectivity.
## `LANGGRAPH_POSTGRES_POOL_MAX_SIZE`
Beginning with langgraph-api version `0.2.12`, the maximum size of the Postgres connection pool can be controlled using the `LANGGRAPH_POSTGRES_POOL_MAX_SIZE` environment variable. By setting this variable, you can determine the upper bound on the number of simultaneous connections the server will establish with the Postgres database. This is particularly useful for deployments where database resources are limited (or more available) or where you need to tune connection behavior for performance or scaling reasons. If not specified, the pool size defaults to 150 connections.
## `REDIS_URI_CUSTOM`
!!! info "Only for Self-Hosted Data Plane and Self-Hosted Control Plane"
Custom Redis instances are only available for [Self-Hosted Data Plane](../../concepts/langgraph_self_hosted_data_plane.md) and [Self-Hosted Control Plane](../../concepts/langgraph_self_hosted_control_plane.md) deployments.
Specify `REDIS_URI_CUSTOM` to use a custom Redis instance. The value of `REDIS_URI_CUSTOM` must be a valid [Redis connection URI](https://redis-py.readthedocs.io/en/stable/connections.html#redis.Redis.from_url).
## `REDIS_KEY_PREFIX`
!!! info "Available in API Server version 0.1.9+"
This environment variable is supported in API Server version 0.1.9 and above.
Specify a prefix for Redis keys. This allows multiple LangGraph Server instances to share the same Redis instance by using different key prefixes.
Defaults to `''`.
## `REDIS_CLUSTER`
!!! info "Only Allowed in Self-Hosted Deployments"
Redis Cluster mode is only available in Self-Hosted Deployment models, LangGraph Cloud SaaS will provision a redis instance for you by default.
Set `REDIS_CLUSTER` to `True` to enable Redis Cluster mode. When enabled, the system will connect to Redis using cluster mode. This is useful when connecting to a Redis Cluster deployment.
Defaults to `False`.
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---
search:
boost: 2
---
# Agent architectures
Many LLM applications implement a particular control flow of steps before and / or after LLM calls. As an example, [RAG](https://github.com/langchain-ai/rag-from-scratch) performs retrieval of documents relevant to a user question, and passes those documents to an LLM in order to ground the model's response in the provided document context.
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# Application Structure
!!! info "Prerequisites"
@@ -15,7 +20,7 @@ This guide shows a typical structure for a LangGraph application and shows how t
To deploy using the LangGraph Platform, the following information should be provided:
1. A [LangGraph API Configuration file](#configuration-file) (`langgraph.json`) that specifies the dependencies, graphs, environment variables to use for the application.
1. A [LangGraph API Configuration file](#configuration-file-concepts) (`langgraph.json`) that specifies the dependencies, graphs, environment variables to use for the application.
2. The [graphs](#graphs) that implement the logic of the application.
3. A file that specifies [dependencies](#dependencies) required to run the application.
4. [Environment variable](#environment-variables) that are required for the application to run.
@@ -77,7 +82,7 @@ Below are examples of directory structures for Python and JavaScript application
The directory structure of a LangGraph application can vary depending on the programming language and the package manager used.
## Configuration File
## Configuration File {#configuration-file-concepts}
The `langgraph.json` file is a JSON file that specifies the dependencies, graphs, environment variables, and other settings required to deploy a LangGraph application.
@@ -145,18 +150,18 @@ A LangGraph application may depend on other Python packages or JavaScript librar
You will generally need to specify the following information for dependencies to be set up correctly:
1. A file in the directory that specifies the dependencies (e.g., `requirements.txt`, `pyproject.toml`, or `package.json`).
2. A `dependencies` key in the [LangGraph configuration file](#configuration-file) that specifies the dependencies required to run the LangGraph application.
3. Any additional binaries or system libraries can be specified using `dockerfile_lines` key in the [LangGraph configuration file](#configuration-file).
2. A `dependencies` key in the [LangGraph configuration file](#configuration-file-concepts) that specifies the dependencies required to run the LangGraph application.
3. Any additional binaries or system libraries can be specified using `dockerfile_lines` key in the [LangGraph configuration file](#configuration-file-concepts).
## Graphs
Use the `graphs` key in the [LangGraph configuration file](#configuration-file) to specify which graphs will be available in the deployed LangGraph application.
Use the `graphs` key in the [LangGraph configuration file](#configuration-file-concepts) to specify which graphs will be available in the deployed LangGraph application.
You can specify one or more graphs in the configuration file. Each graph is identified by a name (which should be unique) and a path for either: (1) the compiled graph or (2) a function that makes a graph is defined.
## Environment Variables
If you're working with a deployed LangGraph application locally, you can configure environment variables in the `env` key of the [LangGraph configuration file](#configuration-file).
If you're working with a deployed LangGraph application locally, you can configure environment variables in the `env` key of the [LangGraph configuration file](#configuration-file-concepts).
For a production deployment, you will typically want to configure the environment variables in the deployment environment.
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# Assistants
!!! info "Prerequisites"
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# Authentication & Access Control
LangGraph Platform provides a flexible authentication and authorization system that can integrate with most authentication schemes.
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# Breakpoints
Breakpoints pause graph execution at specific points and enable stepping through execution step by step. Breakpoints are powered by LangGraph's [**persistence layer**](./persistence.md), which saves the state after each graph step. Breakpoints can also be used to enable [**human-in-the-loop**](./human_in_the_loop.md) workflows, though we recommend using the [`interrupt` function](./human_in_the_loop.md#interrupt) for this purpose.

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