ToolCallLimitMiddleware

This release introduces new features like exposing `trace_policy` on `AgentMiddleware` and adding `reasoning_effort` as a chat model parameter. It also includes several bug fixes, such as preserving history on summarization failures and handling malformed structured-output responses.

LangChain v1.0.0 release introduces Python 3.14 support, a suite of new tool and model middleware, and significant refactoring of the agents and tools namespaces for production stability.

Initial release of LangChain v1.0.0 and Core v1.0.0rc, featuring a major refactor of middleware hooks (wrap_model_call/wrap_tool_call), async support for agents, and the removal of global variables.

LangChain v1.0.0 release featuring a major refactor of the agents API, introduction of a robust middleware system (PII, retries, limits), and namespace consolidation. It transitions the project to a stable versioning scheme with enhanced async support and improved Human-In-The-Loop patterns.

Initial release of LangChain v1.0.0 series, featuring a major refactor of middleware hooks (wrap_model_call/wrap_tool_call), improved HITL capabilities, and namespace consolidation.

LangChain v1.0.0 introduces a revamped agent API, a new middleware system for model and tool calls, and significant namespace consolidation. It transitions the codebase to Python 3.10+ and standardizes asynchronous support across core components.

Initial release of LangChain v1.0.0 (alpha stages), featuring a major refactor of the agent API, the introduction of a middleware system for LLM calls, and the removal of legacy globals and Python 3.9 support.

LangChain v1.0.0 introduces a major architectural shift focusing on agent middleware, improved HITL patterns, and a streamlined core namespace. It officially drops support for Python 3.9 and renames several key agent APIs for better consistency.

LangChain v1.0.0 introduces a major architectural shift focusing on a new middleware system, improved agent hooks, and the removal of legacy global variables and Python 3.9 support. It standardizes the agent API and enhances production features like HITL and PII filtering.