Merge branch 'main' of https://github.com/langchain-ai/langgraph

libs/checkpoint-postgres/Makefile

@@ -1,4 +1,4 @@
-.PHONY: test test_watch lint format
+.PHONY: test test_watch lint type format
 
 ######################
 # TESTING AND COVERAGE
@@ -61,6 +61,9 @@ lint lint_diff lint_package lint_tests:
 	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE)
 	[ "$(PYTHON_FILES)" = "" ] || uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
 
+type:
+	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+
 format format_diff:
 	uv run ruff format $(PYTHON_FILES)
 	uv run ruff check --select I --fix $(PYTHON_FILES)

libs/checkpoint-sqlite/Makefile

@@ -1,4 +1,4 @@
-.PHONY: test test_watch lint format
+.PHONY: test test_watch lint type format
 
 ######################
 # TESTING AND COVERAGE
@@ -32,6 +32,9 @@ lint lint_diff lint_package lint_tests:
 	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE)
 	[ "$(PYTHON_FILES)" = "" ] || uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
 
+type:
+	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+
 format format_diff:
 	uv run ruff format $(PYTHON_FILES)
 	uv run ruff check --select I --fix $(PYTHON_FILES)

libs/checkpoint/Makefile

@@ -1,4 +1,4 @@
-.PHONY: test test_watch lint format
+.PHONY: test test_watch lint type format
 
 ######################
 # TESTING AND COVERAGE
@@ -32,6 +32,9 @@ lint lint_diff lint_package lint_tests:
 	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE)
 	[ "$(PYTHON_FILES)" = "" ] || uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
 
+type:
+	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+
 format format_diff:
 	uv run ruff format $(PYTHON_FILES)
 	uv run ruff check --select I --fix $(PYTHON_FILES)

libs/cli/Makefile

@@ -1,4 +1,4 @@
-.PHONY: test lint format test-integration update-schema bump-version
+.PHONY: test lint type format test-integration update-schema bump-version
 
 ######################
 # TESTING AND COVERAGE
@@ -29,6 +29,9 @@ lint lint_diff lint_package lint_tests:
 	[ "$(PYTHON_FILES)" = "" ] || uv run ruff check --select I $(PYTHON_FILES)
 	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE) || uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
 
+type:
+	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+
 format format_diff:
 	uv run ruff format $(PYTHON_FILES)
 	uv run ruff check --select I --fix $(PYTHON_FILES)

libs/cli/generate_schema.py

@@ -20,6 +20,7 @@ from langgraph_cli.schemas import (
     Config,
     ConfigurableHeaderConfig,
     CorsConfig,
+    GraphDef,
     HttpConfig,
     IndexConfig,
     SecurityConfig,
@@ -108,6 +109,7 @@ def add_descriptions_to_schema(schema, cls):
             # Find the class that corresponds to this definition
             for potential_cls in [
                 Config,
+                GraphDef,
                 StoreConfig,
                 IndexConfig,
                 AuthConfig,

libs/cli/langgraph_cli/schemas.py

@@ -529,6 +529,21 @@ class WebhookUrlPolicy(TypedDict, total=False):
     """Disallow relative URLs (internal loopback calls) when true."""
 
 
+class GraphDef(TypedDict, total=False):
+    """Definition of a graph with additional metadata."""
+
+    path: str
+    """Required. Import path to the graph object.
+
+    Format: "path/to/file.py:object_name"
+    """
+    description: str | None
+    """Optional. A description of the graph's purpose and functionality.
+
+    This description is surfaced in the API and can help users understand what the graph does.
+    """
+
+
 class WebhooksConfig(TypedDict, total=False):
     env_prefix: str
     """Required prefix for environment variables referenced in header templates.
@@ -619,19 +634,23 @@ class Config(TypedDict, total=False):
     Defaults to an empty list, meaning no additional packages installed beyond your base environment.
     """
 
-    graphs: dict[str, str]
+    graphs: dict[str, str | GraphDef]
     """Optional. Named definitions of graphs, each pointing to a Python object.
 
-    
+
     Graphs can be StateGraph, @entrypoint, or any other Pregel object OR they can point to (async) context
     managers that accept a single configuration argument (of type RunnableConfig) and return a pregel object
     (instance of Stategraph, etc.).
-    
-    Keys are graph names, values are "path/to/file.py:object_name".
+
+    Keys are graph names, values are either "path/to/file.py:object_name" strings
+    or objects with a "path" key and optional "description" key.
     Example:
         {
             "mygraph": "graphs/my_graph.py:graph_definition",
-            "anothergraph": "graphs/another.py:get_graph"
+            "anothergraph": {
+                "path": "graphs/another.py:get_graph",
+                "description": "A graph that does X"
+            }
         }
     """
 
@@ -696,6 +715,7 @@ class Config(TypedDict, total=False):
 
 __all__ = [
     "Config",
+    "GraphDef",
     "StoreConfig",
     "CheckpointerConfig",
     "AuthConfig",

libs/cli/schemas/schema.json

@@ -127,9 +127,16 @@
             "graphs": {
               "type": "object",
               "additionalProperties": {
-                "type": "string"
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "$ref": "#/$defs/GraphDef"
+                  }
+                ]
               },
-              "description": "Optional. Named definitions of graphs, each pointing to a Python object.\n\n\nGraphs can be StateGraph, @entrypoint, or any other Pregel object OR they can point to (async) context\nmanagers that accept a single configuration argument (of type RunnableConfig) and return a pregel object\n(instance of Stategraph, etc.).\n"
+              "description": "Optional. Named definitions of graphs, each pointing to a Python object.\n\n\nGraphs can be StateGraph, @entrypoint, or any other Pregel object OR they can point to (async) context\nmanagers that accept a single configuration argument (of type RunnableConfig) and return a pregel object\n(instance of Stategraph, etc.).\n\nor objects with a \"path\" key and optional \"description\" key."
             },
             "http": {
               "anyOf": [
@@ -341,9 +348,16 @@
             "graphs": {
               "type": "object",
               "additionalProperties": {
-                "type": "string"
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "$ref": "#/$defs/GraphDef"
+                  }
+                ]
               },
-              "description": "Optional. Named definitions of graphs, each pointing to a Python object.\n\n\nGraphs can be StateGraph, @entrypoint, or any other Pregel object OR they can point to (async) context\nmanagers that accept a single configuration argument (of type RunnableConfig) and return a pregel object\n(instance of Stategraph, etc.).\n"
+              "description": "Optional. Named definitions of graphs, each pointing to a Python object.\n\n\nGraphs can be StateGraph, @entrypoint, or any other Pregel object OR they can point to (async) context\nmanagers that accept a single configuration argument (of type RunnableConfig) and return a pregel object\n(instance of Stategraph, etc.).\n\nor objects with a \"path\" key and optional \"description\" key."
             },
             "http": {
               "anyOf": [
@@ -662,6 +676,29 @@
       },
       "required": []
     },
+    "GraphDef": {
+      "title": "GraphDef",
+      "description": "Definition of a graph with additional metadata.",
+      "type": "object",
+      "properties": {
+        "description": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "Optional. A description of the graph's purpose and functionality.\n\nThis description is surfaced in the API and can help users understand what the graph does.\n"
+        },
+        "path": {
+          "type": "string",
+          "description": "Required. Import path to the graph object.\n"
+        }
+      },
+      "required": []
+    },
     "HttpConfig": {
       "title": "HttpConfig",
       "description": "Configuration for the built-in HTTP server that powers your deployment's routes and endpoints.",

libs/cli/schemas/schema.v0.json

@@ -127,9 +127,16 @@
             "graphs": {
               "type": "object",
               "additionalProperties": {
-                "type": "string"
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "$ref": "#/$defs/GraphDef"
+                  }
+                ]
               },
-              "description": "Optional. Named definitions of graphs, each pointing to a Python object.\n\n\nGraphs can be StateGraph, @entrypoint, or any other Pregel object OR they can point to (async) context\nmanagers that accept a single configuration argument (of type RunnableConfig) and return a pregel object\n(instance of Stategraph, etc.).\n"
+              "description": "Optional. Named definitions of graphs, each pointing to a Python object.\n\n\nGraphs can be StateGraph, @entrypoint, or any other Pregel object OR they can point to (async) context\nmanagers that accept a single configuration argument (of type RunnableConfig) and return a pregel object\n(instance of Stategraph, etc.).\n\nor objects with a \"path\" key and optional \"description\" key."
             },
             "http": {
               "anyOf": [
@@ -341,9 +348,16 @@
             "graphs": {
               "type": "object",
               "additionalProperties": {
-                "type": "string"
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "$ref": "#/$defs/GraphDef"
+                  }
+                ]
               },
-              "description": "Optional. Named definitions of graphs, each pointing to a Python object.\n\n\nGraphs can be StateGraph, @entrypoint, or any other Pregel object OR they can point to (async) context\nmanagers that accept a single configuration argument (of type RunnableConfig) and return a pregel object\n(instance of Stategraph, etc.).\n"
+              "description": "Optional. Named definitions of graphs, each pointing to a Python object.\n\n\nGraphs can be StateGraph, @entrypoint, or any other Pregel object OR they can point to (async) context\nmanagers that accept a single configuration argument (of type RunnableConfig) and return a pregel object\n(instance of Stategraph, etc.).\n\nor objects with a \"path\" key and optional \"description\" key."
             },
             "http": {
               "anyOf": [
@@ -662,6 +676,29 @@
       },
       "required": []
     },
+    "GraphDef": {
+      "title": "GraphDef",
+      "description": "Definition of a graph with additional metadata.",
+      "type": "object",
+      "properties": {
+        "description": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "Optional. A description of the graph's purpose and functionality.\n\nThis description is surfaced in the API and can help users understand what the graph does.\n"
+        },
+        "path": {
+          "type": "string",
+          "description": "Required. Import path to the graph object.\n"
+        }
+      },
+      "required": []
+    },
     "HttpConfig": {
       "title": "HttpConfig",
       "description": "Configuration for the built-in HTTP server that powers your deployment's routes and endpoints.",

libs/langgraph/Makefile

@@ -1,4 +1,4 @@
-.PHONY: all format lint test test_watch integration_tests spell_check spell_fix benchmark profile start-dev-server integration_tests
+.PHONY: all format lint type test test_watch integration_tests spell_check spell_fix benchmark profile start-dev-server integration_tests
 
 # Default target executed when no arguments are given to make.
 all: help
@@ -125,6 +125,9 @@ lint lint_diff lint_package lint_tests:
 	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE)
 	[ "$(PYTHON_FILES)" = "" ] || uv run mypy langgraph --cache-dir $(MYPY_CACHE)
 
+type:
+	mkdir -p $(MYPY_CACHE) && uv run mypy langgraph --cache-dir $(MYPY_CACHE)
+
 format format_diff:
 	uv run ruff format $(PYTHON_FILES)
 	uv run ruff check --select I --fix $(PYTHON_FILES)
@@ -147,6 +150,7 @@ help:
 	@echo '-- LINTING --'
 	@echo 'format                       - run code formatters'
 	@echo 'lint                         - run linters'
+	@echo 'type                         - run type checking'
 	@echo 'spell_check               	- run codespell on the project'
 	@echo 'spell_fix               		- run codespell on the project and fix the errors'
 	@echo '-- TESTS --'

libs/prebuilt/Makefile

@@ -1,4 +1,4 @@
-.PHONY: all format lint test test-fast test_watch integration_tests spell_check spell_fix benchmark profile
+.PHONY: all format lint type test test-fast test_watch integration_tests spell_check spell_fix benchmark profile
 
 # Default target executed when no arguments are given to make.
 all: help
@@ -50,6 +50,9 @@ lint lint_diff lint_package lint_tests:
 	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE)
 	[ "$(PYTHON_FILES)" = "" ] || uv run mypy langgraph --cache-dir $(MYPY_CACHE)
 
+type:
+	mkdir -p $(MYPY_CACHE) && uv run mypy langgraph --cache-dir $(MYPY_CACHE)
+
 format format_diff:
 	uv run ruff format $(PYTHON_FILES)
 	uv run ruff check --fix $(PYTHON_FILES)
@@ -72,6 +75,7 @@ help:
 	@echo '-- LINTING --'
 	@echo 'format                       - run code formatters'
 	@echo 'lint                         - run linters'
+	@echo 'type                         - run type checking'
 	@echo 'spell_check               	- run codespell on the project'
 	@echo 'spell_fix               		- run codespell on the project and fix the errors'
 	@echo '-- TESTS --'

libs/sdk-py/Makefile

@@ -1,4 +1,4 @@
-.PHONY: lint format test
+.PHONY: lint type format test
 
 test:
 	uv run pytest tests
@@ -19,6 +19,9 @@ lint lint_diff:
 	[ "$(PYTHON_FILES)" = "" ] || uv run ruff check --select I $(PYTHON_FILES)
 	uv run ty check .
 
+type:
+	uv run ty check .
+
 format format_diff:
 	uv run ruff check --select I --fix $(PYTHON_FILES)
 	uv run ruff format $(PYTHON_FILES)