Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
TelemetryArea: what it touches
Internal ChangesKind: in v2.1.311,
Internal ChangesSection of the release
What
Claude Code can run as an MCP server, a program that offers its tools to other apps through the Model Context Protocol. In that mode, the usage information attached to each tool call now includes two more figures:
started_mcp_servers: how many MCP servers were started
loop_stall_ms: how long, in milliseconds, Claude Code's internal event loop was held up, measured by a regular timer that adds up any delays
Why
This gives a clearer picture of how responsive Claude Code is while serving tools, and how many servers it is running.
