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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 v2.1.83 24 Mar 2026

MCP Registry for Official Server Validation

Claude Code now fetches the official Anthropic MCP server registry at startup to validate MCP server URLs. This allows trusted servers to receive enhanced metadata forwarding (server name and tool name in API requests), improving the quality of tool-use responses.

Evidence

MCP registry validation (search for "mcp-registry", "https://api.anthropic.com/mcp-registry/v0/servers")

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

See this entry in the whole of v2.1.83 →