Jul 16, 2025 · Jun 3, 2025 · Jun 3, 2025 · Jun 3, 2025 · Jun 3, 2025 · Jun 3, 2025
diff --git a/pydantic_ai_slim/pydantic_ai/ext/langchain.py b/pydantic_ai_slim/pydantic_ai/ext/langchain.py
 from pydantic.json_schema import JsonSchemaValue

 from pydantic_ai.tools import Tool
 from pydantic_ai.toolset import FunctionToolset


 class LangChainTool(Protocol):
    def run(self, *args: Any, **kwargs: Any) -> str: ...


 __all__ = ('tool_from_langchain',)
 __all__ = ('tool_from_langchain', 'LangChainToolset')


 def tool_from_langchain(langchain_tool: LangChainTool) -> Tool:
        description=function_description,
        json_schema=schema,
    )


 class LangChainToolset(FunctionToolset):
    """A toolset that wraps LangChain tools."""

    def __init__(self, tools: list[LangChainTool]):
        super().__init__([tool_from_langchain(tool) for tool in tools])
diff --git a/pydantic_ai_slim/pydantic_ai/toolset.py b/pydantic_ai_slim/pydantic_ai/toolset.py

    @property
    def name(self) -> str:
        return self.__class__.__name__
        return self.__class__.__name__.replace('Toolset', ' toolset')

    @property
    def name_conflict_hint(self) -> str:
    max_retries: int = field(default=1)
    tools: dict[str, Tool[Any]] = field(default_factory=dict)

    @property
    def name(self) -> str:
        return 'FunctionToolset'

    def __init__(self, tools: Sequence[Tool[AgentDepsT] | ToolFuncEither[AgentDepsT, ...]] = [], max_retries: int = 1):
        self.max_retries = max_retries
        self.tools = {}
diff --git a/tests/ext/test_langchain.py b/tests/ext/test_langchain.py
 from pydantic.json_schema import JsonSchemaValue

 from pydantic_ai import Agent
 from pydantic_ai.ext.langchain import tool_from_langchain
 from pydantic_ai.ext.langchain importLangChainToolset,tool_from_langchain


 @dataclass
        }


 def test_langchain_tool_conversion():
    langchain_tool = SimulatedLangChainTool(
        name='file_search',
        description='Recursively search for files in a subdirectory that match the regex pattern',
        args={
            'dir_path': {
                'default': '.',
                'description': 'Subdirectory to search in.',
                'title': 'Dir Path',
                'type': 'string',
            },
            'pattern': {
                'description': 'Unix shell regex, where * matches everything.',
                'title': 'Pattern',
                'type': 'string',
            },
 langchain_tool = SimulatedLangChainTool(
    name='file_search',
    description='Recursively search for files in a subdirectory that match the regex pattern',
    args={
        'dir_path': {
            'default': '.',
            'description': 'Subdirectory to search in.',
            'title': 'Dir Path',
            'type': 'string',
        },
    )
        'pattern': {
            'description': 'Unix shell regex, where * matches everything.',
            'title': 'Pattern',
            'type': 'string',
        },
    },
 )


 def test_langchain_tool_conversion():
    pydantic_tool = tool_from_langchain(langchain_tool)

    agent = Agent('test', tools=[pydantic_tool], retries=7)
    result = agent.run_sync('foobar')
    assert result.output == snapshot("{\"file_search\":\"I was called with {'dir_path': '.', 'pattern': 'a'}\"}")


 def test_langchain_toolset():
    toolset = LangChainToolset([langchain_tool])
    agent = Agent('test', toolsets=[toolset], retries=7)
    result = agent.run_sync('foobar')
    assert result.output == snapshot("{\"file_search\":\"I was called with {'dir_path': '.', 'pattern': 'a'}\"}")


 def test_langchain_tool_no_additional_properties():
    langchain_tool = SimulatedLangChainTool(
        name='file_search',
diff --git a/tests/test_tools.py b/tests/test_tools.py
    # this raises an error
    with pytest.raises(
        UserError,
        match="FunctionToolset defines a tool whose name conflicts with existing tool from OutputToolset: 'ctx_tool'. Consider renaming the tool or wrapping the toolset in a `PrefixedToolset` to avoid name conflicts.",
        match="Function toolset defines a tool whose name conflicts with existing tool from OutputToolset: 'ctx_tool'. Consider renaming the tool or wrapping the toolset in a `PrefixedToolset` to avoid name conflicts.",
    ):
        Agent('test', tools=[ctx_tool], deps_type=int, output_type=ToolOutput(int, name='ctx_tool'))
Original file line number	Diff line number	Diff line change
Expand Up		@@ -3,6 +3,7 @@
		from pydantic.json_schema import JsonSchemaValue

		from pydantic_ai.tools import Tool
		from pydantic_ai.toolset import FunctionToolset


		class LangChainTool(Protocol):
Expand All		@@ -23,7 +24,7 @@ def description(self) -> str: ...
		def run(self, args: Any, *kwargs: Any) -> str: ...


		__all__ = ('tool_from_langchain',)
		__all__ = ('tool_from_langchain', 'LangChainToolset')


		def tool_from_langchain(langchain_tool: LangChainTool) -> Tool:
Expand DownExpand Up		@@ -59,3 +60,10 @@ def proxy(args: Any, *kwargs: Any) -> str:
		description=function_description,
		json_schema=schema,
		)


		class LangChainToolset(FunctionToolset):
		"""A toolset that wraps LangChain tools."""

		def __init__(self, tools: list[LangChainTool]):
		super().__init__([tool_from_langchain(tool) for tool in tools])
Original file line number	Diff line number	Diff line change
Expand Up		@@ -46,7 +46,7 @@ class AbstractToolset(ABC, Generic[AgentDepsT]):

		@property
		def name(self) -> str:
		return self.__class__.__name__
		return self.__class__.__name__.replace('Toolset', ' toolset')

		@property
		def name_conflict_hint(self) -> str:
Expand DownExpand Up		@@ -110,10 +110,6 @@ class FunctionToolset(AbstractToolset[AgentDepsT]):
		max_retries: int = field(default=1)
		tools: dict[str, Tool[Any]] = field(default_factory=dict)

		@property
		def name(self) -> str:
		return 'FunctionToolset'

		def __init__(self, tools: Sequence[Tool[AgentDepsT] \| ToolFuncEither[AgentDepsT, ...]] = [], max_retries: int = 1):
		self.max_retries = max_retries
		self.tools = {}
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -6,7 +6,7 @@
		from pydantic.json_schema import JsonSchemaValue

		from pydantic_ai import Agent
		from pydantic_ai.ext.langchain import tool_from_langchain
		from pydantic_ai.ext.langchain importLangChainToolset,tool_from_langchain


		@dataclass
Expand DownExpand Up		@@ -49,31 +49,40 @@ def get_input_jsonschema(self) -> JsonSchemaValue:
		}


		def test_langchain_tool_conversion():
		langchain_tool = SimulatedLangChainTool(
		name='file_search',
		description='Recursively search for files in a subdirectory that match the regex pattern',
		args={
		'dir_path': {
		'default': '.',
		'description': 'Subdirectory to search in.',
		'title': 'Dir Path',
		'type': 'string',
		},
		'pattern': {
		'description': 'Unix shell regex, where * matches everything.',
		'title': 'Pattern',
		'type': 'string',
		},
		langchain_tool = SimulatedLangChainTool(
		name='file_search',
		description='Recursively search for files in a subdirectory that match the regex pattern',
		args={
		'dir_path': {
		'default': '.',
		'description': 'Subdirectory to search in.',
		'title': 'Dir Path',
		'type': 'string',
		},
		)
		'pattern': {
		'description': 'Unix shell regex, where * matches everything.',
		'title': 'Pattern',
		'type': 'string',
		},
		},
		)


		def test_langchain_tool_conversion():
		pydantic_tool = tool_from_langchain(langchain_tool)

		agent = Agent('test', tools=[pydantic_tool], retries=7)
		result = agent.run_sync('foobar')
		assert result.output == snapshot("{\"file_search\":\"I was called with {'dir_path': '.', 'pattern': 'a'}\"}")


		def test_langchain_toolset():
		toolset = LangChainToolset([langchain_tool])
		agent = Agent('test', toolsets=[toolset], retries=7)
		result = agent.run_sync('foobar')
		assert result.output == snapshot("{\"file_search\":\"I was called with {'dir_path': '.', 'pattern': 'a'}\"}")


		def test_langchain_tool_no_additional_properties():
		langchain_tool = SimulatedLangChainTool(
		name='file_search',
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -589,7 +589,7 @@ def test_tool_return_conflict():
		# this raises an error
		with pytest.raises(
		UserError,
		match="FunctionToolset defines a tool whose name conflicts with existing tool from OutputToolset: 'ctx_tool'. Consider renaming the tool or wrapping the toolset in a `PrefixedToolset` to avoid name conflicts.",
		match="Function toolset defines a tool whose name conflicts with existing tool from OutputToolset: 'ctx_tool'. Consider renaming the tool or wrapping the toolset in a `PrefixedToolset` to avoid name conflicts.",
		):
		Agent('test', tools=[ctx_tool], deps_type=int, output_type=ToolOutput(int, name='ctx_tool'))

Expand Down