_generate_tool_call_response() — anthropic-sdk-python Function Reference

Source Code

src/anthropic/lib/tools/_beta_runner.py lines 552–598

    async def _generate_tool_call_response(self) -> BetaMessageParam | None:
        content = await self._get_last_assistant_message_content()
        if not content:
            return None

        tool_use_blocks = [block for block in content if block.type == "tool_use"]
        if not tool_use_blocks:
            return None

        results: list[BetaToolResultBlockParam] = []

        for tool_use in tool_use_blocks:
            tool = self._tools_by_name.get(tool_use.name)
            if tool is None:
                warnings.warn(
                    f"Tool '{tool_use.name}' not found in tool runner. "
                    f"Available tools: {list(self._tools_by_name.keys())}. "
                    f"If using a raw tool definition, handle the tool call manually and use `append_messages()` to add the result. "
                    f"Otherwise, pass the tool using `beta_async_tool(func)` or a `@beta_async_tool` decorated function.",
                    UserWarning,
                    stacklevel=3,
                )
                results.append(
                    {
                        "type": "tool_result",
                        "tool_use_id": tool_use.id,
                        "content": f"Error: Tool '{tool_use.name}' not found",
                        "is_error": True,
                    }
                )
                continue

            try:
                result = await tool.call(tool_use.input)
                results.append({"type": "tool_result", "tool_use_id": tool_use.id, "content": result})
            except Exception as exc:
                log.exception(f"Error occurred while calling tool: {tool.name}", exc_info=exc)
                results.append(
                    {
                        "type": "tool_result",
                        "tool_use_id": tool_use.id,
                        "content": repr(exc),
                        "is_error": True,
                    }
                )

        return {"role": "user", "content": results}