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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 v2.1.239

Custom session titles move to a per-session file on disk

You'll notice
Useful2 Signal2
Sessions

A session title you set is now stored in its own file beside the transcript.

What

A title you set for a session is now saved to its own small JSON file next to the session transcript, and removed from that file when you clear the title. Session summaries read the title back from that file when the recent conversation history does not already carry one.

Details
  • The new file, custom-title.json, joins the other per-session side files Claude Code keeps (ccr-tip.json and precompact.json).
  • A helper scans the transcript backwards for the last user or assistant timestamp when writing the record.
  • The older path that read the title inline from either of two conversation records is gone, along with the inline handler for clearing a session title.
  • Live in this build, no flag.
Evidence

writeSessionTitleSidecar: , custom-title.json

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

See this entry in the whole of v2.1.239 →