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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

Slash commands can be refused by a live policy check

You'll notice
Useful3 Signal3
Slash Commands

A slash command can now be refused by a policy attached to it, with the reason shown.

What

Before running a slash command, Claude Code now consults a policy value attached to the command entry and can refuse it, showing the reason. Commands with no such policy value attached still run as before.

Details
  • The policy value is supplied by the server on each command entry; absent one, the command is allowed.
  • Refusals emit telemetry that separates a stale command list from an active denial.
Evidence

tengu_input_slash_invalid

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 v2.1.251 →