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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.221

Headless MCP startup wait reworked

Under the hood
Useful2 Signal0
MCP not in their notes

Headless runs decide more carefully whether to wait for MCP servers before starting.

CLAUDE_CODE_ENVIRONMENT_KIND
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.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.221 →