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langchain-core==1.2.20

LangChain Releases / 3/19/2026

📰 NewsDeveloper Stack & InfrastructureTools & Practical Usage

Key Points

  • LangChain Core 1.2.20 has been released, featuring fixes, new capabilities, and documentation updates (#36085).
  • The core now traces invocation parameters in metadata to improve observability (#36080).
  • LangSmith integration metadata has been added to create_agent and init_chat_model (#35810).
  • The release hardens anti-SSRF in core, and the CI workflow avoids unnecessary dependency installs in lint targets (#35960, #36046).
  • Documentation updates document the base_url in the Mermaid API (#35961), and a dependency bump from orjson 3.11.5 to 3.11.6 in libs/core (#35805).

Changes since langchain-core==1.2.19

release(core): 1.2.20 (#36085)
fix(core): trace invocation params in metadata (#36080)
feat: Add LangSmith integration metadata to create_agent and init_chat_model (#35810)
feat(core): harden anti-ssrf (#35960)
ci: avoid unnecessary dep installs in lint targets (#36046)
docs(core): document base_url in mermaid api (#35961)
chore: bump orjson from 3.11.5 to 3.11.6 in /libs/core (#35805)
chore: housekeeping (#35850)