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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

Remote sessions can start a vitals emitter

Use it now
Useful2 Signal3
Sessions Notable not in their notes

Managed remote sessions can start a health reporter, and you can turn it off with an environment variable.

CLAUDE_CODE_DISABLE_VITALS_EMITTER
What

A managed remote session that has an SDK URL now loads and starts a vitals emitter on demand, logging a warning if that load fails. A CLAUDE_CODE_DISABLE_VITALS_EMITTER variable exists to switch it off.

Details
  • Requires a remote session id, an SDK URL, and a further runtime check before it starts.
Evidence

vitals_emitter_import_failed

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 v2.1.239 →