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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 v2.1.219

claude mcp list shows why a server failed

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Useful4 Signal0
MCP

claude mcp list now tells you why a server failed, like a timeout or HTTP error, not just "Failed to connect".

claude mcp list
What

A failed server is no longer reported as just "Failed to connect"; the status line can now say what went wrong.

Details
  • the per-server status result optionally carries an issue field, which the list formatter appends to the status
  • the detail is derived from the error code and displayDetail, for example "request timed out" or an HTTP code
  • MCP error reporting joins error and displayDetail into a single sanitised string
Evidence

Failed to connect

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.219 →