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 v2.1.248 Home All releases olderv2.1.247 v2.1.250newer
Claude Code v2.1.248

Argument allowlist for the Claude Design MCP tools

Under the hood
Useful2 Signal4
MCP

Claude Design tools now have a per-tool list of accepted arguments for listing systems, projects and files.

What

A per-tool map now lists which top-level arguments each Claude Design tool accepts, covering listing design systems, fetching the design prompt, listing and fetching projects, listing files, reading a file, fetching a conversation and listing members.

Evidence

get_claude_design_prompt

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

See this entry in the whole of v2.1.248 →