When MCP servers fail to connect or need authentication at startup, a structured tree notification now appears listing each affected server with its status and error details.
Details
The notification identifies whether each server needs authentication, has a config issue, or has failed for another reason.
Shows a summary count: N MCP server(s) not connected — run /mcp to authenticate, retry, or see details:
Servers requiring authentication are highlighted as errors; others as warnings.
Excludes IDE-attached servers (sse-ide, ws-ide types) and servers that are marked as claudeai-proxy.
Evidence
Notification text (search for "MCP server(s) not connected — run /mcp to authenticate, retry, or see details:")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeFixed a stray "(no content)" line left in the transcript after closing panel dialogs like /mcp and /plugins
