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ActiveAIRelease1.4.0

langchain==1.4.0

What happened

Changes since langchain==1.3.18 docs(langchain): runnable langchain.mcp examples ( #39976 ) feat(langchain): langchain.mcp namespace, MCPAdapter ( #39939 ) perf(anthropic,langchain): omit middleware trace inputs ( #40098 ) fix(langchain): include model destination in agent tool routing ( #38355 ) chore(langchain): bump vcrpy test dependency minimum to >=8.2.0 ( #39942 )

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