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 v2.1.227 Home All releases olderv2.1.226 v2.1.228newer
Claude Code v2.1.227

Sandbox and container detection folded into one cached prober

Under the hood
Useful2 Signal2
Sandbox not in their notes

Docker, bubblewrap and root-outside-sandbox checks share one cached prober that answers false until ready.

IS_SANDBOX
What

Docker, bubblewrap, running as root outside a deliberate sandbox, and "contained with no internet" checks now live in a single class that caches each probe. One gate additionally requires an internal-network probe to come back empty. Its synchronous accessor reports false until the asynchronous checks have settled, so very early callers see the negative answer. The bubblewrap and IS_SANDBOX=1 signals are Linux-only.

Evidence

passesAntDspEnvGateSync

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 v2.1.227 →