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 v2.1.251 Home All releases olderv2.1.250
Claude Code v2.1.251

Sandbox network prompts reject lookalike hostnames

You'll notice
Useful3 Signal2
Sandbox

Sandbox network prompts refuse lookalike hostnames instead of creating a rule for them.

What

When a sandboxed process asks for network access, the prompt now refuses hosts whose spelling changes under international-domain normalization, the trick behind lookalike domain names. No permission rule is created and a warning is logged.

Details
  • Unconditional in the sandbox ask callback, not behind a flag.
  • Companion to the same check on session-level host grants.
Evidence

Refusing a sandbox network ask for a host srt would re-spell

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 →