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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 v2.1.248 27 Aug 2026

MCP server list over the control protocol is trimmed

You'll notice

Useful3 Signal3

MCP

SDK and IDE clients now only see MCP server names and status, not full config.

What

The MCP server list sent to SDK and IDE clients now contains only each server's name and status. Full server configuration is no longer sent over that channel.

Evidence

mcpServers

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

See this entry in the whole of v2.1.248 →