Agent integrations need safer upgrades.
LangChain's adapter moves to MCP SDK 2 and supports modern and legacy servers together.
Server-prefixed tool names require corresponding approval-rule updates; elicitation can pause a run through LangGraph interrupts.
LangChain's Google integration maps minimal reasoning requests to LOW for Gemini models rejecting MINIMAL.
The release targets HTTP 400 errors for affected Gemini 3 models; it is not a quota increase or a new model launch.
Archive reconstructed on 8 October 2026. Agent integrations need migration tests: check tool approval names, paused-run resumption and reasoning settings against release notes. A targeted fix does not establish that every model or workflow is supported. Test before production.
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