Source Intelligence

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.

All of v2.1.248 Home All releases olderv2.1.247 v2.1.250newer
Claude Code v2.1.248

Background sessions report a taken session id as a distinct crash

You'll notice
Useful2 Signal2
Sessions

Background sessions that hit an already-claimed session id now fail with a clear dimmed notice.

What

If a background session starts with an id another session already claims, it now ends on its own path: the session is marked crashed, a dimmed notice goes to the output stream, and a dedicated event is recorded with the attempt number, how it was launched and the launch mode. Previously this fell into the generic crash and exit handling.

Details
  • Event name tengu_bg_session_id_taken, with attempt, via and launch_mode fields.
  • Unconditional on this code path; no flag.
Evidence

tengu_bg_session_id_taken

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

See this entry in the whole of v2.1.248 →