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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 v2.1.248

Startup profiling records a fixed set of named phases

Use it now
Useful3 Signal2
Startup not in their notes

Startup profiling now names specific phases including MCP connection and remote config setup.

CLAUDE_CODE_PROFILE_STARTUP
What

With startup profiling enabled via CLAUDE_CODE_PROFILE_STARTUP, the timing report now names specific phases including MCP server connection stages and remote config initialization. The variable itself is not new.

Evidence

growthbook_init

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 v2.1.248 →