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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.

← All of v2.1.251 Home All releases ←olderv2.1.250

Claude Code v2.1.251 28 Aug 2026

Only main-loop sessions hold a live artifact watch

You'll notice

Useful3 Signal3

Artifacts

Only your main session holds a live artifact watch; subagents and background sessions do not.

What

The artifact watch tool description now spells out that a live watch is held only by an interactive or SDK main-loop session. Publishing or calling watch from a subagent, teammate, background, or print session arms no live subscription at all.

Evidence

only an interactive or SDK main-loop session holds one — a subagent, teammate, background, or print session's publish or 'watch' arms none

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

See this entry in the whole of v2.1.251 →