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[Docs](https://github.com/langchain-ai/docs/pull/4370) Fixes #37031 Adds support for OpenAI Responses API `apply_patch` built-in tool. This PR: - Adds `apply_patch` to the OpenAI well-known tools list so `bind_tools([{"type": "apply_patch"}])` works. - Preserves `apply_patch_call` and `apply_patch_call_output` items when converting OpenAI Responses API outputs into LangChain `AIMessage.content`. - Preserves the same item types in streaming `AIMessageChunk` conversion. - Supports round-trip input conversion for `apply_patch_call` and `apply_patch_call_output`. - Adds unit tests for core tool passthrough, non-streaming conversion, streaming conversion, and round-trip input conversion. ## Testing - `cd libs/core && uv run --group test pytest tests/unit_tests/utils/test_function_calling.py -k "apply_patch" -vv` - `cd libs/partners/openai && uv run --group test pytest tests/unit_tests/chat_models/test_base.py -k "apply_patch" -vv` - `cd libs/core && uv run --all-groups ruff check langchain_core/utils/function_calling.py tests/unit_tests/utils/test_function_calling.py` - `cd libs/partners/openai && uv run --all-groups ruff check langchain_openai/chat_models/base.py tests/unit_tests/chat_models/test_base.py` --------- Co-authored-by: Mason Daugherty <github@mdrxy.com> Co-authored-by: Mason Daugherty <mason@langchain.dev>