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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 v2.1.224

Server can push work hints over SSE so the runner picks up jobs faster

Not switched on
Useful2 Signal5
Self-Hosted Runner Notable not in their notes

The runner can hold a live server connection and wake instantly on work, but it defaults off.

Server-pushed work_available hints over SSE sit behind CCR_SHR_SSE_HINTS, off by default, and nothing else in the build enables it.

CCR_SHR_SSE_HINTS
What

Set CCR_SHR_SSE_HINTS and the runner holds an event-stream connection to the server and wakes its poll loop as soon as a work_available event arrives, instead of waiting out the full poll interval. It defaults to off, and nothing else in the build turns it on.

Details
  • Wakes are jittered by up to 200ms to spread out a fleet reacting to the same event, and the wake source is reported back to the server.
  • The stream times out after 45 seconds without a read and reconnects with exponential backoff capped at 30 seconds.
  • Wakes are suppressed while the runner is already at capacity.
Evidence

CCR_SHR_SSE_HINTS

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 v2.1.224 →