The binary speaks the Model Context Protocol over stdio. Point an MCP client at it, for example by adding it to the client's server list with the command pixelpact-mcp.

Tools

extract_contract extracts a visual contract from a reference URL and saves it as JSON.
check_implementation measures an implementation URL against a saved contract and returns a formatted deviation table plus numeric totals.
diff_pixels compares an implementation URL against the contract's reference screenshot pixel by pixel.
read_contract_summary reads a saved contract and describes it without opening a browser.

A typical loop: extract_contract once against the reference design, then check_implementation after each change, then diff_pixels for a stricter final check.

Requirements

Node >= 22.12. Playwright browsers must be installed separately, for example pnpm exec playwright install chromium, since playwright is a peer dependency.