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 v2.1.224 Home All releases olderv2.1.223 v2.1.225newer

Forked skill launches: session cap removed, duplicate race closed

You'll notice
Useful4 Signal3
Subagents Notable

The cap on forked-skill subagents per session is gone, and duplicate launches are blocked.

What

The per-session cap on how many forked-skill subagents you can spawn is gone from this build entirely. The rule that only one agent per forked skill runs at a time is now checked both before and after the async write that reserves it, closing a window where two launches could both get through.

Evidence

forked_skill_live_duplicate

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 →