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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 v2.1.118 22 Apr 2026

Anthropic Client Platform Header

API requests now include an anthropic-client-platform header that identifies the entrypoint context (VSCode, remote, SDK, MCP, GitHub Action, local agent, Slack, or CLI). This enables better server-side analytics.

Evidence

Header function YDH() at line ~147245 (search for "anthropic-client-platform").

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.118 →