## Summary
Originally this auto-selected a workspace's sole listener for
self-hosted/hybrid control planes the same way #9056 already does for
Cloud. Per review, that's reverted: in self-hosted environments, leaving
placement blank is the deliberate signal to deploy to the bundled
operator, not an unresolved default. Auto-selecting a sole listener
there would silently take that option away from anyone who has both a
bundled operator and one listener configured, with no way to get it
back.
The actual need behind this was simpler: a way to find a listener's id
without hardcoding it, so it can be passed to `--listener-id`
explicitly. `HostBackendClient.list_listeners()` already existed and is
used internally for placement resolution, but had no CLI surface of its
own.
This adds `langgraph deploy listeners list`, mirroring the existing
`deploy list` / `deploy revisions list` pattern, to look up a
workspace's listeners and their namespaces. No change to default
placement behavior.
## Test plan
- [x] `make format && make lint` clean in `libs/cli`
- [x] `format_listeners_table` unit test in `test_util.py`
- [x] CLI-level tests for `deploy listeners list` (with and without
results) in `test_cli.py`
- [x] Full `libs/cli` suite: 508 passed, no regressions
### Summary
```
% langgraph deploy revisions list f5bb6e58-e2ab-40b9-9855-d6dd6d1051b6
No LangSmith API key found. Create one at Settings > API Keys in LangSmith.
Enter LangSmith API key:
Revision ID Status Created At
------------------------------------ -------- ---------------------------
fe05f163-58cf-4783-a918-0c78a8fab0c7 BUILDING 2026-03-12T20:47:14.626436Z
03c32fcf-544f-4517-a016-c7a7243b898d DEPLOYED 2026-03-12T20:30:09.199275Z
29605810-29cc-4110-ac05-d43e564827d0 DEPLOYED 2026-03-12T19:56:36.232427Z
```
### Summary
This PR introduces a subcommand implementation that allows `langgraph
deploy list` and `langgraph deploy delete` subcommands.
#### `langgraph deploy list`
```bash
(env) andrewnguonly@Andrew-Nguonly-KC23X90J02 langgraph % langgraph deploy list --help ⎈ gke_langchain-test-387119_us-west1_langgraph-cloud-us-west1
Usage: langgraph deploy list [OPTIONS]
[Beta] List LangSmith Deployments.
Options:
--name-contains TEXT Only show deployments whose names contain this value.
--api-key TEXT API key. Can also be set via LANGGRAPH_HOST_API_KEY,
LANGSMITH_API_KEY, or LANGCHAIN_API_KEY environment
variable or .env file.
--help Show this message and exit.
```
Output example:
```bash
(env) andrewnguonly@Andrew-Nguonly-KC23X90J02 cli % langgraph deploy list
Deployment ID Deployment Name Deployment URL
------------------------------------ -------------------------- ------------------------------------------------------------------------------------
a40d6567-87c0-485a-a23d-94309a7d4519 ht-andrew-test-04 -
9da26acb-d0c9-4af0-af9e-f3fe8dfe85bc ht-anirudh-deployment-test https://ht-anirudh-deployment-test-428af4737f8a533cb2b107587eb8f38f.us.langgraph.app/
```
#### `langgraph deploy delete`
```bash
(env) andrewnguonly@Andrew-Nguonly-KC23X90J02 langgraph % langgraph deploy delete --help ⎈ gke_langchain-test-387119_us-west1_langgraph-cloud-us-west1
Usage: langgraph deploy delete [OPTIONS] DEPLOYMENT_ID
[Beta] Delete a LangSmith Deployment.
Options:
--force Delete without prompting for confirmation.
--api-key TEXT API key. Can also be set via LANGGRAPH_HOST_API_KEY,
LANGSMITH_API_KEY, or LANGCHAIN_API_KEY environment variable
or .env file.
--help Show this message and exit.
```
Output example:
```bash
(env) andrewnguonly@Andrew-Nguonly-KC23X90J02 cli % langgraph deploy delete a40d6567-87c0-485a-a23d-94309a7d4519
Are you sure you want to delete deployment ID a40d6567-87c0-485a-a23d-94309a7d4519? (Y/n): Y
Host API key:
Deleted deployment a40d6567-87c0-485a-a23d-94309a7d4519.
```
```bash
(env) andrewnguonly@Andrew-Nguonly-KC23X90J02 cli % langgraph deploy delete a40d6567-87c0-485a-a23d-94309a7d4519
Are you sure you want to delete deployment ID a40d6567-87c0-485a-a23d-94309a7d4519? (Y/n): n
Aborted!
```
```bash
(env) andrewnguonly@Andrew-Nguonly-KC23X90J02 cli % langgraph deploy delete 9da26acb-d0c9-4af0-af9e-f3fe8dfe85bc --force
Host API key:
Deleted deployment 9da26acb-d0c9-4af0-af9e-f3fe8dfe85bc.
```
### Summary
This PR introduces a subcommand implementation that allows `langgraph
deploy list` and `langgraph deploy delete` subcommands.
#### `langgraph deploy list`
```bash
(env) andrewnguonly@Andrew-Nguonly-KC23X90J02 langgraph % langgraph deploy list --help ⎈ gke_langchain-test-387119_us-west1_langgraph-cloud-us-west1
Usage: langgraph deploy list [OPTIONS]
[Beta] List LangSmith Deployments.
Options:
--name-contains TEXT Only show deployments whose names contain this value.
--api-key TEXT API key. Can also be set via LANGGRAPH_HOST_API_KEY,
LANGSMITH_API_KEY, or LANGCHAIN_API_KEY environment
variable or .env file.
--help Show this message and exit.
```
Output example:
```bash
(env) andrewnguonly@Andrew-Nguonly-KC23X90J02 cli % langgraph deploy list
Deployment ID Deployment Name Deployment URL
------------------------------------ -------------------------- ------------------------------------------------------------------------------------
a40d6567-87c0-485a-a23d-94309a7d4519 ht-andrew-test-04 -
9da26acb-d0c9-4af0-af9e-f3fe8dfe85bc ht-anirudh-deployment-test https://ht-anirudh-deployment-test-428af4737f8a533cb2b107587eb8f38f.us.langgraph.app
```
#### `langgraph deploy delete`
```bash
(env) andrewnguonly@Andrew-Nguonly-KC23X90J02 langgraph % langgraph deploy delete --help ⎈ gke_langchain-test-387119_us-west1_langgraph-cloud-us-west1
Usage: langgraph deploy delete [OPTIONS] DEPLOYMENT_ID
[Beta] Delete a LangSmith Deployment.
Options:
--force Delete without prompting for confirmation.
--api-key TEXT API key. Can also be set via LANGGRAPH_HOST_API_KEY,
LANGSMITH_API_KEY, or LANGCHAIN_API_KEY environment variable
or .env file.
--help Show this message and exit.
```
Output example:
```bash
(env) andrewnguonly@Andrew-Nguonly-KC23X90J02 cli % langgraph deploy delete a40d6567-87c0-485a-a23d-94309a7d4519
Are you sure you want to delete deployment ID a40d6567-87c0-485a-a23d-94309a7d4519? (Y/n): Y
Host API key:
Deleted deployment a40d6567-87c0-485a-a23d-94309a7d4519.
```
```bash
(env) andrewnguonly@Andrew-Nguonly-KC23X90J02 cli % langgraph deploy delete a40d6567-87c0-485a-a23d-94309a7d4519
Are you sure you want to delete deployment ID a40d6567-87c0-485a-a23d-94309a7d4519? (Y/n): n
Aborted!
```
```bash
(env) andrewnguonly@Andrew-Nguonly-KC23X90J02 cli % langgraph deploy delete 9da26acb-d0c9-4af0-af9e-f3fe8dfe85bc --force
Host API key:
Deleted deployment 9da26acb-d0c9-4af0-af9e-f3fe8dfe85bc.
```
This adds a configuration option in `HttpConfig` that allows LangGraph
Platform users to apply custom authentication hooks before (other)
custom middleware. Currently, the order is fixed (custom middleware is
always evaluated before custom auth).
(Apologies for the noise in
[de187a9](https://github.com/langchain-ai/langgraph/pull/6179/commits/de187a989e807c5687c22db1fc065d24030fa6b7),
apparently from the forced application of new linter rules.)
### Description
Added unit tests for util.py.
Authored by @oumizx. Had to copy #6113 into this separate PR because
langgraph/libs/cli was having issues with secrets.
