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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 v2.1.63

Asciicast Terminal Recording [Internal]

What

Infrastructure for recording terminal sessions in asciicast v2 format (.cast files).

Status

Internal infrastructure — no user-facing command to enable or control recording.

Details
  • Monkey-patches process.stdout.write to capture all terminal output with timestamps
  • Recordings stored under ~/.claude/projects/<project>/ as .cast files
  • Supports flushing and renaming recordings for session management
  • File permissions set to owner read/write only (mode 384)
Evidence

Recording infrastructure (search for "[asciicast] Recording to", "[asciicast] Renamed recording")

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 v2.1.63 →