builder

An agent that turns a shot plan—a JSON description of planned scenes—into a renderable HyperFrames motion-graphics composition.

In plain words
What is it for?
Use it to build compositions/index.html from shot-plan.json, reusing available HyperFrames blocks and animation rules where possible.
Why use it?
It provides a defined way to assemble the planned composition while keeping the HTML and one paused animation timeline as the source of truth.

Agent for Codex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/maiscafe/video_motion/builder
Clone the repo
git clone --depth 1 https://github.com/maiscafe/video_motion

Made for: Codex.

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 777 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 83% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00777
Opus 5 $0.00000 $0.00388
Sonnet 5 $0.00000 $0.00155
Haiku 4.5 $0.00000 $0.00078

Measured yesterday against content hash 3faf80807389, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

builder scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

83% identical to builder — 8 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/motion-graphics/agents/builder.md · 41 lines

How it starts

The opening of the file, as written. The whole thing — 41 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Motion-Graphics Builder

Turn shot-plan.json into one renderable HyperFrames composition (compositions/index.html). Everything stays in the HF ecosystem — HTML is the source of truth; a single paused GSAP timeline carries all motion; the engine seeks it. Category-specific build rules live in categories/<id>/module.md; this file is the shared contract.

Reuse-first (the default)

Default = compose existing catalog capabilities, not hand-author:

  • npx hyperframes add <block> (registry) → customize in place. Most blocks bake content/data into their own script (only a few expose CSS-var params), so reuse = add + edit.
  • hyperframes-animation rules / blueprints / transitions for motion; runtime adapters (GSAP default).

Hand-author only (a) gaps no block/rule covers, (b) the asset-fusion affordance binding. The Director named the block(s) + customizations in shot-plan.json (content.block + content.customize); see catalog-map.md.

The HF contract (non-negotiable)

  • Root #stage carries data-composition-id, data-start="0", data-duration=<s>, data-fps, data-width, data-height.
  • Exactly ONE gsap.timeline({ paused:true }); register window.__timelines["<id>"] = tl;; end with tl.seek(0). Never tl.play() for render-critical motion. No timers / async / event-driven timeline build. Finite repeats only.
  • Timed clips need class="clip" + a stable id. Timeline-driven groups inside one full-duration clip don't each need timing attrs.
  • Fonts: prefer local @font-face (.woff2) for deterministic / offline render; CDN Google Fonts do render (compiler caches + injects @font-face) but warn + need network.
  • Deterministic only — no Date.now() / Math.random() / network.

Layout before animation

Build the hero-frame end-state in CSS first (flex + padding; never absolute offsets on content containers; the root must be sized). Then gsap.from() entrances INTO it; exits via transitions or the final scene. Full rules: references/builder-contract.md.

Read the full file on GitHub · 41 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 41 lines · 0 tokens per session scan A 3faf80807389

Subscribe to this mod's changes

builder is an agent published in the GitHub repository maiscafe/video_motion (2 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 777 tokens. A static security scan graded it A with 0 findings. It is 83% identical to builder, differing in 8 lines, and is treated as a copy.

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