MotionSpec — web animation accessibility MCP
Web animation accessibility MCP: GSAP, static CSS checks, prefers-reduced-motion, WCAG 2.2.2/2.3.3.
| Endpoint | https://api.motionspec.dev/mcp (streamable-http) |
|---|---|
| Registry version | 1.2.12 |
| Now | 5 tools · grade B (81) · pin ts_c1823244027dc1f440cd261a0ae7f32a · protocol 2025-06-18 |
| First / last listed | 2026-11-10 01:09 UTC / 2026-11-10 01:09 UTC |
| Grade over time | 2026-11-10: B (81), 5 tools |
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Tools: motion_catalog motion_validate motion_compile motion_audit motion_stats
motion_catalog | Returns the catalog of verified motion primitives (names, purpose, parameter schemas, defaults) plus the authoring rules for writing a MotionSpec. Call this FIRST, then write the spec yourself, check it with motion_validate and compile it with motion_compile. Free motion check: https://motionspec.dev/motion-check · paid Motion Report (9 USD, one-time): https://motionspec.dev/pricing?src=mcp-motion params: none |
motion_validate | Checks a MotionSpec against the schema, the primitive allow-list, parameter bounds and injection rules. Fail-closed: returns ok=false with precise errors. Returns {ok, errors, warnings, deprecations, catalogVersion}. IMPORTANT: warnings[] carries the WCAG 2.2.2 / reduced-motion findings and can be non-empty while ok=true — a spec that compiles is not automatically accessible. Use to pre-check a sp params: spec* |
motion_compile | Validates (fail-closed) and deterministically compiles a MotionSpec into vanilla-GSAP JavaScript and CSS, with prefers-reduced-motion enabled by default and a performance-budget report. Same spec always yields identical code. Returns {ok:true, js, css, warnings, report, catalogVersion} or {ok:false, errors, catalogVersion}; css may be null when no CSS is emitted. Read warnings before shipping: exp params: spec*, specName |
motion_audit | Static motion-a11y checker: fetches a URL's HTML + linked stylesheets (up to 12 sheets, 2 MB per response, 8 s timeout) and scans the CSS for (1) animation/transition that moves without an effective (cascade-aware) prefers-reduced-motion guard, (2) animated non-transform/opacity properties, (3) infinite animations with no pause path, (4) <marquee>/autoplay >5s. Colour/opacity-only transitions are params: url* |
motion_stats | Operator telemetry of the hosted service (not your own usage); needs the operator key (header x-motionspec-key). This unauthenticated call returns access information only; it does not compile code, fetch URLs, run an audit or read usage data. Arguments are optional and unused. Returns isError:true with structuredContent {ok:false, error:'KEY_REQUIRED', tool, freeLocalAlternative} and text guidance params: none |
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