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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 v2.1.246

Routine creation always documents the one-shot schedule field

Use it now
Useful3 Signal2
Background Tasks not in their notes

Routine creation now always offers run_once_at as an alternative to a cron expression.

run_once_at
What

The routine-creation instructions now always list run_once_at as an alternative to a cron expression, exactly one of which is required. Claude therefore always knows a routine can fire a single time at a future UTC timestamp and then disable itself.

Evidence

RFC3339 UTC timestamp. Must be in the future. Fires once, then auto-disables.

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 v2.1.246 →