MCP servers are reconnected after sign-in less often when they close
Claude Code no longer rejoins an MCP server after re-authentication when its close reason matches a certain check, and stops retrying one new error kind
You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
Bug FixesKind: in v2.1.288,
Bug FixesSection of the release
What
MCP servers are outside programs that give Claude Code extra tools. When a connection to one closes while you are signing in again, Claude Code used to try to rejoin it. It now skips the rejoin when the reason given for the close matches a certain check. A new kind of error is also treated as one that should not be retried.
Why
In practice, Claude Code makes fewer automatic reconnection attempts to MCP servers in some cases.
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtIt is not clear which close reasons stop the rejoin or which error is no longer retried.
