MCPInstall

waapi

by heygen-comFrontend & Design

Web Animations API adapter patterns for HyperFrames. Use when authoring element.animate() motion, Animation currentTime seeking, document.getAnimations(), KeyframeEffect timing, fill modes, or native browser animations that must render deterministically in HyperFrames.

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68.7K
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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/heygen-com/hyperframes --skill waapi
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads waapi automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

Security audits

Independent scans of the skill's instructions and bundled files.

Gen Agent Trust Hub PassSAFE ·The skill provides patterns and best practices for using the Web Animations API (WAAPI) within the HyperFrames framework. It contains documentation, code examples, and standard developer validation commands. No security issues were detected.
Socket PassNo alerts
Snyk PassLOW ·Risk: LOW · No issues

SKILL.md

The instructions your agent reads when the skill is triggered.

Web Animations API for HyperFrames

HyperFrames can seek Web Animations API animations through its waapi runtime adapter. WAAPI is useful when you want native browser keyframes with JavaScript-created timing and no GSAP dependency.

Contract

  • Create animations synchronously during composition initialization.
  • Use element.animate(...) with finite duration and iterations.
  • Use fill: "both" so seeked states persist.
  • Pause animations after creation or let the adapter pause them on first seek.
  • Avoid callbacks and promises for render-critical state.

The adapter calls document.getAnimations(), sets each animation's currentTime to HyperFrames time in milliseconds, then pauses it.

Basic Pattern

<div id="orb" class="clip orb" data-start="2" data-duration="3" data-track-index="2"></div>

<script>
  const orb = document.getElementById("orb");
  const animation = orb.animate(
    [
      { transform: "translate3d(-160px, 0, 0) scale(0.8)", opacity: 0 },
      { transform: "translate3d(0, 0, 0) scale(1)", opacity: 1, offset: 0.35 },
      { transform: "translate3d(120px, 0, 0) scale(1.08)", opacity: 1 },
    ],
    {
      duration: 3000,
      delay: 2000,
      easing: "cubic-bezier(0.2, 0, 0, 1)",
      fill: "both",
      iterations: 1,
    },
  );

  animation.pause();
</script>

Stagger Pattern

document.querySelectorAll(".token").forEach((token, index) => {
  const animation = token.animate(
    [
      { transform: "translateY(24px)", opacity: 0 },
      { transform: "translateY(0)", opacity: 1 },
    ],
    {
      duration: 620,
      delay: index * 80,
      easing: "cubic-bezier(0.2, 0, 0, 1)",
      fill: "both",
      iterations: 1,
    },
  );
  animation.pause();
});

Good Uses

  • Lightweight DOM motion where CSS keyframes are too rigid and GSAP is unnecessary.
  • Generated animations from structured data.
  • Simple timelines that can be represented as keyframes, delays, and offsets.

Avoid

  • Infinite iterations.
  • Depending on animation.finished to mutate render-critical DOM.
  • Running separate clocks with requestAnimationFrame, timers, or performance.now().
  • Animating layout properties when transforms and opacity can express the motion.
  • Assuming clip-local start time is automatic. WAAPI adapter seeks document-level animation time; model clip offsets with delay or create the animation on an element whose visibility is controlled by HyperFrames timing.

Validation

After editing a WAAPI composition:

npx hyperframes lint
npx hyperframes validate

Credits And References

FAQ

What does the waapi skill do?

Web Animations API adapter patterns for HyperFrames. Use when authoring element.animate() motion, Animation currentTime seeking, document.getAnimations(), KeyframeEffect timing, fill modes, or native browser animations that must render deterministically in HyperFrames.

How do I install waapi?

Run npx skills add https://github.com/heygen-com/hyperframes --skill waapi in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/waapi/ (personal) or .claude/skills/waapi/ (project).

Which AI agents can use waapi?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is waapi safe to install?

Security partners have reviewed it: Gen Agent Trust Hub passed; Socket passed; Snyk passed. As with any skill, read the SKILL.md and bundled scripts before installing.

Who maintains waapi?

It is published by heygen-com in heygen-com/hyperframes. It has 68,692 recorded installs.

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