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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.50 20 Feb 2026

Pending MCP Server Notification in ToolSearch

What

When searching for deferred tools, if some MCP servers are still connecting, the tool now reports which servers are pending.

Details

Results include pending_mcp_servers field when servers are still initializing
Message indicates servers are connecting and tools will become available shortly

Evidence

Pending server handling (search for "Some MCP servers are still connecting", "pending_mcp_servers")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.50 →