_handle_view() — langchain Function Reference

Source Code

libs/partners/anthropic/langchain_anthropic/middleware/anthropic_tools.py lines 322–368

    def _handle_view(
        self, args: dict, state: AnthropicToolsState, tool_call_id: str | None
    ) -> Command:
        """Handle view command."""
        path = args["path"]
        normalized_path = _validate_path(path, allowed_prefixes=self.allowed_prefixes)

        files = cast("dict[str, Any]", state.get(self.state_key, {}))
        file_data = files.get(normalized_path)

        if file_data is None:
            # Try directory listing
            matching = _list_directory(files, normalized_path)

            if matching:
                content = "\n".join(matching)
                return Command(
                    update={
                        "messages": [
                            ToolMessage(
                                content=content,
                                tool_call_id=tool_call_id,
                                name=self.tool_name,
                            )
                        ]
                    }
                )

            msg = f"File not found: {path}"
            raise FileNotFoundError(msg)

        # Format file content with line numbers
        lines_content = file_data["content"]
        formatted_lines = [f"{i + 1}|{line}" for i, line in enumerate(lines_content)]
        content = "\n".join(formatted_lines)

        return Command(
            update={
                "messages": [
                    ToolMessage(
                        content=content,
                        tool_call_id=tool_call_id,
                        name=self.tool_name,
                    )
                ]
            }
        )