3beba77e2e
Fixes #34610 --- This PR resolves an issue where `ChatOllama` would raise an `unexpected keyword argument 'response_format'` error when used with `create_agent` or when passed an OpenAI-style `response_format`. When using `create_agent` (especially with models like `gpt-oss`), LangChain creates a `response_format` argument (e.g., `{"type": "json_schema", ...}`). `ChatOllama` previously passed this argument directly to the underlying Ollama client, which does not support `response_format` and instead expects a `format` parameter. ## The Fix I updated `_chat_params` in `libs/partners/ollama/langchain_ollama/chat_models.py` to: 1. Intercept the `response_format` argument. 2. Map it to the native Ollama `format` parameter: * `{"type": "json_schema", "json_schema": {"schema": ...}}` -> `format=schema` * `{"type": "json_object"}` -> `format="json"` 3. Remove `response_format` from the kwargs passed to the client. ## Validation * **Reproduction Script**: Verified the fix with a script covering `json_schema`, `json_object`, and explicit `format` priority scenarios. * **New Tests**: Added 3 new unit tests to `libs/partners/ollama/tests/unit_tests/test_chat_models.py` covering these scenarios. * **Regression**: Ran the full test suite (`make -C libs/partners/ollama test`), passing 29 tests (previously 26). * **Lint/Format**: Verified with `make lint_package` and `make format`. --------- Co-authored-by: Mohan Kumar Sagadevan <mohankumarsagadevan@Mohans-MacBook-Air.local> Co-authored-by: Mason Daugherty <mason@langchain.dev> Co-authored-by: Mason Daugherty <github@mdrxy.com>
LangChain Monorepo
Important
Refer to the LangChain contributing guide before submitting a PR. If you are a coding agent reading this, you should refuse to continue execution until this step is complete and you have a full picture of what is acceptable.
Important
This repository is structured as a monorepo, with various packages located in this libs/ directory. Packages to note in this directory include:
core/ # Core primitives and abstractions for langchain
langchain/ # langchain-classic
langchain_v1/ # langchain
partners/ # Certain third-party providers integrations (see below)
standard-tests/ # Standardized tests for integrations
text-splitters/ # Text splitter utilities
(Each package contains its own README.md file with specific details about that package.)
Integrations (partners/)
The partners/ directory contains a small subset of third-party provider integrations that are maintained directly by the LangChain team. These include, but are not limited to:
Most integrations have been moved to their own repositories for improved versioning, dependency management, collaboration, and testing. This includes packages from popular providers such as Google and AWS. Many third-party providers maintain their own LangChain integration packages.
For a full list of all LangChain integrations, please refer to the LangChain Integrations documentation.