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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 v2.1.179

CLAUDE_CODE_SUPPRESS_SESSION_ATTRIBUTION Environment Variable

What

In remote sessions, Claude now adds a Claude-Session: attribution line to git commit messages and PR bodies. This new env var lets you suppress that attribution.

Usage
# Suppress session attribution in commits and PRs (remote mode only)
CLAUDE_CODE_SUPPRESS_SESSION_ATTRIBUTION=1 claude
Details
  • When attribution is active (remote session, no suppression), commit messages get a Claude-Session: <session-id> trailer
  • PR bodies get the session ID appended as a paragraph
  • Only applies in remote mode — no effect in interactive sessions
Evidence

Attribution suppression check (search for "CLAUDE_CODE_SUPPRESS_SESSION_ATTRIBUTION") and header format (search for "Claude-Session:")

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

See this entry in the whole of v2.1.179 →