Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.280,
Internal ChangesSection of the release
What
When a turn starts before SDK MCP servers (Model Context Protocol servers set up through the SDK) have finished connecting, Claude Code now records a metric, sdk_mcp_first_query_wait_ms, capturing how long the turn had to wait. This is in addition to the existing warning message that tools aren't available yet.
Why
This gives visibility into how much delay is caused by MCP servers still connecting when a query starts, which can help identify slow-starting servers.
