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

PowerShell is denied for agents with a shell command clamp

You'll notice
Useful3 Signal3
Permissions

Agents with a shell command restriction can't use PowerShell at all now.

What

An agent spawned with a clamp restricting which shell commands it may run now has PowerShell refused outright, since PowerShell commands cannot be matched against Bash command forms. If the PowerShell permission check itself throws, it fails closed instead of running an unverified command. Agents without a clamp are unaffected.

Evidence

this agent carries a per-spawn bashCommandClamp, which scopes shell execution to a

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

See this entry in the whole of v2.1.227 →