json-render is a framework where AI produces user interfaces as structured JSON constrained by a developer-defined component catalogue. It is for building dynamic interfaces from natural-language prompts across web and mobile frameworks.
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.
npx skills add vercel-labs/json-render --skill remotion-best-practicesgit clone --depth 1 https://github.com/vercel-labs/json-renderWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/vercel-labs/json-render/remotion-best-practices)<a href="https://agentmods.dev/skills/vercel-labs/json-render/remotion-best-practices"><img src="https://agentmods.dev/badge/skills/vercel-labs/json-render/remotion-best-practices/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/vercel-labs/json-render/remotion-best-practices"><img src="https://agentmods.dev/badge/skills/vercel-labs/json-render/remotion-best-practices.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00017 | $0.00868 |
| Opus 5.5 | $0.00007 | $0.00347 |
| Sonnet 5.5 | $0.00003 | $0.00174 |
| Haiku 4.5 | $0.00002 | $0.00087 |
Grade A, and why
remotion-best-practices 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 1mo ago.
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.
Copies of this mod
8 near-identical copies found in the catalogue:
- remotion-best-practices — 97% identical, 1 lines differ
- remotion-best-practices — 97% identical, 1 lines differ
- remotion-best-practices — 94% identical, 2 lines differ
- remotion — 92% identical, 8 lines differ
- remotion-best-practices — 84% identical, 16 lines differ
- remotion-best-practices — 84% identical, 11 lines differ
- remotion-best-practices — 84% identical, 16 lines differ
- remotion-best-practices — 84% identical, 11 lines differ
How it starts
The opening of the file, as written. The whole thing — 49 lines — stays where its author put it; the contents beside it link to each section on GitHub.
When to use
Use this skills whenever you are dealing with Remotion code to obtain the domain-specific knowledge.
Captions
When dealing with captions or subtitles, load the ./rules/subtitles.md file for more information.
How to use
Read individual rule files for detailed explanations and code examples:
- rules/3d.md - 3D content in Remotion using Three.js and React Three Fiber
- rules/animations.md - Fundamental animation skills for Remotion
- rules/assets.md - Importing images, videos, audio, and fonts into Remotion
- rules/audio.md - Using audio and sound in Remotion - importing, trimming, volume, speed, pitch
- rules/calculate-metadata.md - Dynamically set composition duration, dimensions, and props
- rules/can-decode.md - Check if a video can be decoded by the browser using Mediabunny
- rules/charts.md - Chart and data visualization patterns for Remotion
- rules/compositions.md - Defining compositions, stills, folders, default props and dynamic metadata
- rules/extract-frames.md - Extract frames from videos at specific timestamps using Mediabunny
- rules/fonts.md - Loading Google Fonts and local fonts in Remotion
- rules/get-audio-duration.md - Getting the duration of an audio file in seconds with Mediabunny
- rules/get-video-dimensions.md - Getting the width and height of a video file with Mediabunny
- rules/get-video-duration.md - Getting the duration of a video file in seconds with Mediabunny
- rules/gifs.md - Displaying GIFs synchronized with Remotion's timeline
- rules/images.md - Embedding images in Remotion using the Img component
- rules/light-leaks.md - Light leak overlay effects using @remotion/light-leaks
- rules/lottie.md - Embedding Lottie animations in Remotion
- rules/measuring-dom-nodes.md - Measuring DOM element dimensions in Remotion
- rules/measuring-text.md - Measuring text dimensions, fitting text to containers, and checking overflow
- rules/sequencing.md - Sequencing patterns for Remotion - delay, trim, limit duration of items
- rules/tailwind.md - Using TailwindCSS in Remotion
- rules/text-animations.md - Typography and text animation patterns for Remotion
- rules/timing.md - Interpolation curves in Remotion - linear, easing, spring animations
- rules/transitions.md - Scene transition patterns for Remotion
- rules/transparent-videos.md - Rendering out a video with transparency
- rules/trimming.md - Trimming patterns for Remotion - cut the beginning or end of animations
- rules/videos.md - Embedding videos in Remotion - trimming, volume, speed, looping, pitch
- rules/parameters.md - Make a video parametrizable by adding a Zod schema
- rules/maps.md - Add a map using Mapbox and animate it
What ships with it
36 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- rules/3d.md 2.2 KB
- rules/animations.md 790 B
- rules/assets.md 1.6 KB
- rules/assets/charts-bar-chart.tsx 3.8 KB
- rules/assets/text-animations-typewriter.tsx 2.3 KB
- rules/assets/text-animations-word-highlight.tsx 2.6 KB
- rules/audio.md 3.5 KB
- rules/calculate-metadata.md 2.9 KB
- rules/can-decode.md 1.5 KB
- rules/charts.md 1.7 KB
- rules/compositions.md 3.6 KB
- rules/display-captions.md 5.3 KB
- rules/extract-frames.md 5.4 KB
- rules/fonts.md 3.4 KB
- rules/get-audio-duration.md 1.3 KB
- rules/get-video-dimensions.md 1.6 KB
- rules/get-video-duration.md 1.3 KB
- rules/gifs.md 3.6 KB
- rules/images.md 2.7 KB
- rules/import-srt-captions.md 2.2 KB
- rules/light-leaks.md 2.3 KB
- rules/lottie.md 1.7 KB
- rules/maps.md 11 KB
- rules/measuring-dom-nodes.md 974 B
- rules/measuring-text.md 2.9 KB
- rules/parameters.md 2.3 KB
- rules/sequencing.md 2.7 KB
- rules/subtitles.md 922 B
- rules/tailwind.md 422 B
- rules/text-animations.md 700 B
- rules/timing.md 3.8 KB
- rules/transcribe-captions.md 1.9 KB
- rules/transitions.md 5.7 KB
- rules/transparent-videos.md 2.2 KB
- rules/trimming.md 1.2 KB
- rules/videos.md 3.4 KB
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.
- 1mo ago First seen · 49 lines · 17 tokens per session scan A a76a94cc9ad7
remotion-best-practices is a skill published in the GitHub repository vercel-labs/json-render (18,783 stars, last pushed yesterday), licensed Apache-2.0. It adds 17 tokens to every session and 868 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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