fix(docs): local API reference documentation build (#32271)

ensure all relevant packages are correctly processed - cli wasn't
included, also fix ValueError

Makefile

@@ -41,6 +41,7 @@ docs_linkcheck:
 ## api_docs_build: Build the API Reference documentation.
 api_docs_build: clean
 	@echo "📖 Building API Reference documentation..."
+	uv pip install -e libs/cli
 	uv run --group docs python docs/api_reference/create_api_rst.py
 	cd docs/api_reference && uv run --group docs make html
 	uv run --group docs python docs/api_reference/scripts/custom_formatter.py docs/api_reference/_build/html/

docs/api_reference/create_api_rst.py

@@ -202,6 +202,12 @@ def _load_package_modules(
         if file_path.name.startswith("_"):
             continue
 
+        if "integration_template" in file_path.parts:
+            continue
+
+        if "project_template" in file_path.parts:
+            continue
+
         relative_module_name = file_path.relative_to(package_path)
 
         # Skip if any module part starts with an underscore
@@ -495,16 +501,7 @@ def _package_namespace(package_name: str) -> str:
 
 def _package_dir(package_name: str = "langchain") -> Path:
     """Return the path to the directory containing the documentation."""
-    if package_name in (
+    if (ROOT_DIR / "libs" / package_name).exists():
-        "langchain",
-        "langchain_v1",
-        "experimental",
-        "community",
-        "core",
-        "cli",
-        "text-splitters",
-        "standard-tests",
-    ):
         return ROOT_DIR / "libs" / package_name / _package_namespace(package_name)
     else:
         return (
@@ -666,18 +663,12 @@ def main(dirs: Optional[list] = None) -> None:
     print("Starting to build API reference files.")
     if not dirs:
         dirs = [
-            dir_
+            p.parent.name
-            for dir_ in os.listdir(ROOT_DIR / "libs")
+            for p in (ROOT_DIR / "libs").rglob("pyproject.toml")
-            if dir_ not in ("cli", "partners", "packages.yml")
+            # Exclude packages that are not directly under libs/ or libs/partners/
-            and "pyproject.toml" in os.listdir(ROOT_DIR / "libs" / dir_)
+            if p.parent.parent.name in ("libs", "partners")
         ]
-        dirs += [
+    for dir_ in sorted(dirs):
-            dir_
-            for dir_ in os.listdir(ROOT_DIR / "libs" / "partners")
-            if os.path.isdir(ROOT_DIR / "libs" / "partners" / dir_)
-            and "pyproject.toml" in os.listdir(ROOT_DIR / "libs" / "partners" / dir_)
-        ]
-    for dir_ in dirs:
         # Skip any hidden directories
         # Some of these could be present by mistake in the code base
         # e.g., .pytest_cache from running tests from the wrong location.
@@ -688,7 +679,7 @@ def main(dirs: Optional[list] = None) -> None:
             print("Building package:", dir_)
             _build_rst_file(package_name=dir_)
 
-    _build_index(dirs)
+    _build_index(sorted(dirs))
     print("API reference files built.")
 
 

libs/cli/langchain_cli/cli.py

@@ -67,12 +67,11 @@ def serve(
     ] = None,
 ) -> None:
     """Start the LangServe app, whether it's a template or an app."""
-    # see if is a template
     try:
         project_dir = get_package_root()
         pyproject = project_dir / "pyproject.toml"
         get_langserve_export(pyproject)
-    except KeyError:
+    except (KeyError, FileNotFoundError):
         # not a template
         app_namespace.serve(port=port, host=host)
     else:

libs/cli/uv.lock

@@ -408,7 +408,7 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "0.3.26"
+version = "0.3.27"
 source = { editable = "../langchain" }
 dependencies = [
     { name = "async-timeout", marker = "python_full_version < '3.11'" },

libs/partners/chroma/langchain_chroma/__init__.py

@@ -1,8 +1,3 @@
-"""This is the langchain_chroma package.
-
-It contains the Chroma class for handling various tasks.
-"""
-
 from langchain_chroma.vectorstores import Chroma
 
 __all__ = [

libs/partners/perplexity/langchain_perplexity/__init__.py

@@ -1,5 +1,3 @@
-"""This package provides the Perplexity integration for LangChain."""
-
 from langchain_perplexity.chat_models import ChatPerplexity
 
 __all__ = ["ChatPerplexity"]

libs/partners/xai/langchain_xai/__init__.py

@@ -1,5 +1,3 @@
-"""This package provides the xAI integration for LangChain."""
-
 from langchain_xai.chat_models import ChatXAI
 
 __all__ = ["ChatXAI"]

libs/partners/xai/pyproject.toml

@@ -55,7 +55,7 @@ target-version = "py39"
 
 [tool.ruff.lint]
 select = ["E", "F", "I", "D", "UP", "S"]
-ignore = [ "UP007", ]
+ignore = [ "UP007", "D104", ]
 
 [tool.coverage.run]
 omit = ["tests/*"]

libs/standard-tests/langchain_tests/__init__.py

@@ -1,6 +1,6 @@
 """Base Test classes for standard testing.
 
 To learn how to use these classes, see the
-`Integration standard testing <https://python.langchain.com/docs/contributing/how_to/integrations/standard_tests/>`_
+`integration standard testing <https://python.langchain.com/docs/contributing/how_to/integrations/standard_tests/>`__
 guide.
 """