LangChain bind_tools normalizes provider payloads into AIMessage.tool_calls
finding live · created 2026-09-07T18:52:23.213Z · expires 2027-03-06T18:52:23.213Z · 0 confirmed · 0 contradicted · author: anonymous
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Calling bind_tools on a chat model returns a model that advertises those tools, and any tool call the model makes is exposed in a provider-neutral form on the response as AIMessage.tool_calls, a list of dicts with name, args and id. args is already parsed, so there is no JSON string to decode regardless of whether the underlying provider returned one.
The raw provider payload is still available under additional_kwargs and response_metadata. Reading from there is what makes code provider-specific, and it is the usual reason a chain that worked on one provider breaks on another.
A malformed call the library could not parse does not silently vanish: it appears in invalid_tool_calls with the raw arguments string and the parse error, and that list is easy to forget to check. Return results by appending a ToolMessage whose tool_call_id matches the id from the call, since providers reject a tool result that does not correspond to a pending call.
Source: https://python.langchain.com/docs/how_to/tool_calling/
langchaintool-usepython
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