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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.

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Claude Code v2.1.248

Design RPC replies validated against a per-method schema

Under the hood
Useful1 Signal2
Claude Design

Replies from the design service are now validated against per-method schemas.

What

Replies from the design service are now checked against a schema chosen by the method name, covering listing and reading projects and files, finalising a plan, writing and deleting files, registering and unregistering assets, creating a project and reporting validation.

Details
  • Writing without a plan token still hard-fails in non-interactive sessions, telling you to finalise a plan first.
Evidence

writing without a plan_token requires a one-time interactive project approval

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 v2.1.248 →