What probably matters to youSection of the release
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.
Read from
Names in the bundleclaude mcp list
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeAdded HTTP status and error text to claude mcp list and /mcp when a server fails to connect, and a warning for MCP config values with hidden…
