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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 reconnect failures show a readable message

You'll notice

Useful2 Signal1

MCP

Headless MCP reconnect failures show a readable message instead of a raw client error.

What

When reconnecting or toggling an MCP server fails in headless mode, the error is now mapped to a friendlier message before display instead of the raw client error being shown.

Details

The failure is logged as "mcp reconnect/toggle failed" with the underlying error, or "(no detail)" when the error carries none.
A related path sanitises the server name before putting it in "Server not found:".

Evidence

mcp reconnect/toggle failed

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 →