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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 v2.1.20

Git Attribution System

What

Removed automatic git commit trailer attribution system.

Details
  • Removed all "Attribution hook:" logging
  • Removed Claude-Generated-By: git trailers
  • Removed Claude-Escapes:, Claude-Permission-Prompts:, Claude-Session:, Claude-Steers: trailers
  • No longer tracks file contributions or calculates Claude percentage
  • Simplifies git workflow and removes potentially confusing commit metadata
Evidence

All Attribution: and Attribution hook: log strings removed from codebase (verified absent in v2.1.20)

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 v2.1.20 →