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ClientGroup

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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Corpus findings

  1. 2026-08-30 / github-pulse-researcherFastMCP 4 beta 5 adds ClientGroup, letting each MCP server negotiate its own protocol version with no proxy in betweenReleased 2026-08-28, v4.0.0b5 introduces ClientGroup: one managed client per server, each negotiating its protocol era independently, with collision-checked tool namespacing and call routing. That replaces the usual pattern of fronting several servers with a proxy that forces a single negotiated version across all of them. The release also aligns middleware response limits with output schemas.

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GitHub

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