{
  "schema_version": "2.0",
  "slug": "bobaba99-motionlint",
  "name": "MotionLint",
  "agent_url": "https://www.resila.ai/motionlint",
  "category": "Frameworks & Eval",
  "run_id": "run-9662f720843d8c21-www-resila-ai",
  "run_at": "2026-08-09T00:31:27.422Z",
  "editor": "Hlido Editor",
  "editorial_method": "public-surface-tier-2+editorial-narrative-v2",
  "methodology_version": "2026.05",
  "methodology_url": "/methodology/public-surface-tier-1/",
  "score": 80,
  "tier": "STEADY",
  "laddoo_score": 80,
  "confidence": "medium",
  "hlido_opinion": {
    "headline": "Reviews the animation your coding agent cannot see, and splits the job honestly — a deterministic linter for what is measurable, a vision model only for what is not.",
    "body": "MotionLint's framing is the sharpest thing about it: coding agents read JSX and CSS and are structurally blind to what a user actually watches happen, so it captures the running app instead of the source. The implementation respects a distinction most tools in this space blur. `motionlint audit` measures every animation in the browser over CDP and lints duration, easing, stagger and exits against encoded numeric standards — no API key, no LLM, SARIF output and exit codes for CI. `motionlint review` is where the vision model goes, returning ranked findings across twelve UX dimensions. Keeping the deterministic half deterministic is what makes this usable as a CI gate rather than a suggestion box, and every finding cites the exact rule and value it was measured against (≤300ms for UI motion, 200–500ms for modals, ease-out on entrances, a prefers-reduced-motion fallback) rather than asserting taste. Accessibility is treated as a lintable rule, not a footnote. A native MCP server puts findings next to the code being written, and `motionlint tune` exports a diff an agent can apply — closing the loop rather than stopping at diagnosis. The claim to treat carefully is '100% recall, 0% false positives on a 24-fixture stress test': a 24-fixture suite is a small, self-authored sample, and a perfect score on it says considerably less than the phrasing implies. There is no third-party validation, no version and no adoption evidence on the captured surface.",
    "voice": "Hlido Editor",
    "as_of": "2026-08-09",
    "editor_signature_pending": true
  },
  "tier_rationale": "STEADY (80) for a well-drawn problem (agents cannot see what renders), a design that keeps the measurable half deterministic and key-free so it can gate CI, findings that cite the exact encoded rule and value, accessibility as a first-class lint, and an MCP path plus an exportable diff that closes the loop back into the agent. Held below VITAL because the only quality evidence offered is a self-authored 24-fixture suite reported as 100% recall / 0% false positives — too small a sample to carry that phrasing — with no version, adoption or independent validation on the surface.",
  "what_it_does_well": [
    "Captures the running app rather than the source, which is the actual blind spot for coding agents",
    "Splits deterministic measurement (audit, no LLM, no API key) from judgement (review, vision model) instead of blending them",
    "SARIF output and exit codes make the deterministic half a usable CI gate",
    "Every finding cites the exact rule and measured value — ≤300ms UI budget, 200–500ms modals, ease-out entrances",
    "Treats prefers-reduced-motion as a lintable accessibility rule, not an afterthought",
    "Native MCP server for Claude Code, Cursor and other MCP-aware clients",
    "`motionlint tune` exports a diff the agent can apply — diagnosis through to fix",
    "MIT-licensed and published on npm"
  ],
  "what_it_fails_at": [
    "'100% recall, 0% false positives' rests on a self-authored 24-fixture suite — too small to support that phrasing",
    "No independent or third-party validation on the captured surface",
    "No version, changelog or adoption evidence published",
    "The `review` path depends on a vision LLM, so its findings are neither free nor reproducible the way `audit` is",
    "Not tested hands-on by Hlido"
  ],
  "best_for": [
    "Teams whose UI is largely written by coding agents and who need motion quality checked by something that can see it",
    "CI pipelines wanting a deterministic, key-free animation gate with SARIF output",
    "Developers who want motion accessibility (prefers-reduced-motion) enforced rather than remembered"
  ],
  "not_recommended_for": [
    "Teams needing validated, independently-benchmarked review quality before adoption",
    "Design systems with deliberately unconventional motion that would fight the encoded budgets",
    "Anyone expecting the LLM `review` path to be as reproducible as the deterministic `audit` path"
  ],
  "red_flags": [
    "'Validated at 100% recall, 0% false positives' is stated without qualification, but the sample is a self-authored 24-fixture stress test. A perfect score on 24 self-chosen fixtures is weak evidence presented in strong language."
  ],
  "compared_to": [],
  "evidence_urls": [
    {
      "claim": "Audits the running web app over CDP rather than reading source",
      "source": "https://www.resila.ai/motionlint",
      "tested_at": "2026-08-09",
      "verified": true
    },
    {
      "claim": "`motionlint audit` is deterministic — no API key, no LLM — with SARIF output and CI exit codes",
      "source": "https://www.resila.ai/motionlint",
      "tested_at": "2026-08-09",
      "verified": true
    },
    {
      "claim": "`motionlint review` uses a vision LLM for ranked findings across 12 UX dimensions",
      "source": "https://www.resila.ai/motionlint",
      "tested_at": "2026-08-09",
      "verified": true
    },
    {
      "claim": "Findings cite encoded standards — ≤300ms UI motion, 200–500ms modals, ease-out on entrances, prefers-reduced-motion fallback",
      "source": "https://www.resila.ai/motionlint",
      "tested_at": "2026-08-09",
      "verified": true
    },
    {
      "claim": "Native MCP server for Claude Code, Cursor and other MCP-aware clients",
      "source": "https://www.resila.ai/motionlint",
      "tested_at": "2026-08-09",
      "verified": true
    },
    {
      "claim": "MIT-licensed and live on npm via `npm install -g motionlint`",
      "source": "https://www.resila.ai/motionlint",
      "tested_at": "2026-08-09",
      "verified": true
    },
    {
      "claim": "'100% recall, 0% false positives' generalises beyond the 24-fixture self-authored suite",
      "source": "https://www.resila.ai/motionlint",
      "tested_at": "2026-08-09",
      "verified": false
    },
    {
      "claim": "Independent validation, version or adoption evidence",
      "source": "https://www.resila.ai/motionlint (none published)",
      "tested_at": "2026-08-09",
      "verified": false
    }
  ],
  "agent_relevance": {
    "has_api": false,
    "has_cli": true,
    "has_mcp": true,
    "has_webhook": false,
    "has_sdk": false,
    "behavioral_testable": true,
    "agent_integration_path": "Built for the coding-agent loop: a native MCP server surfaces findings inside Claude Code or Cursor, the CLI runs in CI with SARIF and exit codes, and `tune` exports a diff the agent applies. The stated purpose is to give an agent eyes it does not have.",
    "agent_friendly_score": 9
  },
  "checklist": [
    {
      "id": "homepage_loads",
      "pass": true,
      "required": true,
      "tested_at": "2026-08-09T00:31:27.422Z"
    },
    {
      "id": "primary_value_prop",
      "pass": true,
      "required": true,
      "evidence": "'Every animation needs a reason' — reviews design and motion of the running app",
      "tested_at": "2026-08-09T00:31:27.422Z"
    },
    {
      "id": "cta_present",
      "pass": true,
      "required": true,
      "evidence": "`npm install -g motionlint` with copy button and GitHub link",
      "tested_at": "2026-08-09T00:31:27.422Z"
    },
    {
      "id": "pricing_or_access",
      "pass": true,
      "required": false,
      "evidence": "Open source, MIT, live on npm",
      "tested_at": "2026-08-09T00:31:27.422Z"
    },
    {
      "id": "docs_present",
      "pass": true,
      "required": true,
      "evidence": "Features, Standards and worked audit output on the page",
      "tested_at": "2026-08-09T00:31:27.422Z"
    },
    {
      "id": "quantified_claim_supported",
      "pass": false,
      "required": false,
      "evidence": "100% recall / 0% false positives rests on a 24-fixture self-authored suite",
      "tested_at": "2026-08-09T00:31:27.422Z"
    },
    {
      "id": "third_party_validation",
      "pass": false,
      "required": false,
      "evidence": "None published",
      "tested_at": "2026-08-09T00:31:27.422Z"
    }
  ],
  "summary": "Reviews the animation your coding agent cannot see, and splits the job honestly — a deterministic linter for what is measurable, a vision model only for what is not.",
  "_summary_deprecation_note": "Field kept as a v1-compatibility alias of hlido_opinion.headline. New consumers should read hlido_opinion.{headline,body,voice,as_of} for the canonical Hlido-owned opinion.",
  "staleness_after": "2026-11-09",
  "review_age_days_at_publish": 0,
  "next_review_due_at": "2026-11-09",
  "attestation_url": "/data/attestations/bobaba99-motionlint.json",
  "signature_pending": true,
  "source": "hlido-editor-v2",
  "marking_signal": {
    "marking_statement": false,
    "detection_tool": false,
    "cop_signatory": null,
    "evidence_url": null,
    "checked_at": "2026-08-09",
    "source": "r4-editorial-enrich-backlog-clear",
    "note": "Review and linting tool; produces findings, not synthetic media."
  },
  "evidence_images": {
    "run_id": "run-9662f720843d8c21-www-resila-ai",
    "base": "https://images.hlido.eu/reviews/bobaba99-motionlint/run-9662f720843d8c21-www-resila-ai",
    "files": [
      "home.png",
      "page_standards.png"
    ],
    "urls": [
      "https://images.hlido.eu/reviews/bobaba99-motionlint/run-9662f720843d8c21-www-resila-ai/home.png",
      "https://images.hlido.eu/reviews/bobaba99-motionlint/run-9662f720843d8c21-www-resila-ai/page_standards.png"
    ]
  },
  "pricing_facts": {
    "schema": "pricing-facts/1",
    "model": [
      "open-source"
    ],
    "free_tier": true,
    "pricing_disclosed": {
      "pass": true,
      "evidence": "Open source, MIT, live on npm",
      "tested_at": "2026-08-09"
    },
    "last_verified": "2026-08-09",
    "basis": "Derived from Hlido-held evidence only (engine checklist + editorial text); quotes are verbatim from the scorecard; not vendor-supplied; re-derived daily. Verify current prices on the vendor's pricing page.",
    "derived_at": "2026-08-21"
  }
}