Claude Code v2.1.221 ·
Headless MCP startup wait reworked
Headless runs decide more carefully whether to wait for MCP servers before starting.
Under the hood
No documentation found Internal Changes
JSON
All of v2.1.221
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.221,
Internal ChangesSection of the release
What
The decision about whether headless startup waits for MCP servers moved into two dedicated helpers.
Details
- one helper reports whether an explicit MCP config asks the run to wait, returning true if any configured server is not of type
sdk - the other computes a
deadlineMs and a localOnly flag localOnly is set for SDK-URL sessions that are not CLAUDE_CODE_ENVIRONMENT_KIND === "bridge" and not in coordinator mode
Evidence
explicitMcpConfigRequestsWait
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
See this entry in the whole of v2.1.221 →
