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Alpha preview of langchain.mcp — a first-party adapter that turns any MCP server into LangChain tools you can hand straight to create_agent . Connection handling is FastMCP 's, so its client features are available as-is rather than re-implemented behind a narrower interface. pip install " langchain[mcp]==1.4.0a2 " Connect MCPAdapter takes any target fastmcp.Client accepts — transport is inferred,…
Initial release fix(langchain): name the content type MCP conversion could not handle release(langchain): 1.4.0a1 test(langchain): skip MCP tests on a pydantic older than mcp supports test(langchain): drive MCP tests through FastMCP's own utilities fix(langchain/mcp): review edits ( #39974 ) Merge remote-tracking branch 'origin/master' into sydney-runkle/langchain/simplify-mcp-adapter…
Changes since langchain-fireworks==1.6.0 release(fireworks): 1.6.1 ( #39975 ) fix(fireworks): drop reasoning history blocks ( #39973 ) chore(model-profiles): refresh model profile data ( #39844 )
Changes since langchain-core==1.6.0 revert: release(core): 1.6.2 ( #39971 ) release(core): 1.6.2 ( #39967 ) fix(core): shore up indexing in genai v1 streaming content ( #39964 ) fix(core): make StructuredTool JSON-serializable ( #39631 ) chore(deps): bump minor and patch dependencies ( #39869 ) release(core): 1.6.1 ( #39832 ) feat(core): propagate gateway information on error path ( #39829 )
Changes since langchain==1.3.17 release(langchain): 1.3.18 ( #39966 ) fix(langchain): preserve content-block shape in PIIMiddleware redaction ( #39894 ) fix(core): shore up indexing in genai v1 streaming content ( #39964 )
Changes since langchain-anthropic==1.6.1 release(anthropic): 1.7.0 ( #39963 ) feat(anthropic): support top-level param for skills via container ; updates thinking display mode ( #39962 ) feat(anthropic): support 1.0 sdk ( #39938 ) fix(anthropic): auto-append advisor-tool-2026-03-01 beta header for advisor_20260301 tool ( #39917 ) feat(anthropic): surface gateway response metadata ( #39809 )
Changes since langchain==1.3.16 release(langchain): 1.3.17 ( #39893 ) fix(langchain): frame custom HITL rejection reasons ( #39773 ) chore(deps): bump minor and patch dependencies ( #39869 )
Changes since langchain-perplexity==1.4.0 release(perplexity): 1.4.1 ( #39826 ) fix(perplexity): include type="message" on Responses input items ( #39774 ) fix(perplexity): preserve caller extra_body ( #39203 ) chore: bump pillow from 12.2.0 to 12.3.0 in /libs/partners/perplexity ( #38991 ) chore(deps): refresh lockfiles ( #38746 ) fix(perplexity): use supported Responses API model ( #38337 )…
Changes since langchain-fireworks==1.5.2 release(fireworks): 1.6.0 ( #39810 ) feat(fireworks): add document reranking ( #39732 ) fix(fireworks): filter invalid tool calls from v1 content ( #39805 ) feat(core): add standard model exception types ( #39538 ) chore(model-profiles): refresh model profile data ( #39646 ) fix(fireworks): avoid repeated service_tier [closes #39619 ] ( #39620 ) chore: bump…
Changes since langchain-anthropic==1.6.0 release(anthropic): 1.6.1 ( #39804 ) fix(anthropic): filter invalid tool calls from v1 content ( #39803 )
