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 oaustegard/claude-skills --skill json-render-uigit clone --depth 1 https://github.com/oaustegard/claude-skillsWrote 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/oaustegard/claude-skills/json-render-ui)<a href="https://agentmods.dev/skills/oaustegard/claude-skills/json-render-ui"><img src="https://agentmods.dev/badge/skills/oaustegard/claude-skills/json-render-ui/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/oaustegard/claude-skills/json-render-ui"><img src="https://agentmods.dev/badge/skills/oaustegard/claude-skills/json-render-ui.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- 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 | $0.00054 | $0.02205 |
| Opus 5 | $0.00027 | $0.01103 |
| Sonnet 5 | $0.00011 | $0.00441 |
| Haiku 4.5 | $0.00005 | $0.00220 |
Grade A, and why
json-render-ui 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 6d 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.
How it starts
The opening of the file, as written. The whole thing — 278 lines — stays where its author put it; the contents beside it link to each section on GitHub.
JSON Render UI
Overview
Transform natural language UI requests into working dashboards and applications. Claude acts as the translation layer (prompt → JSON), the skill provides the rendering runtime (JSON → UI).
Architecture:
User prompt → Claude (constrained by catalog) → UITree JSON → Preact renderer → UI
Output Format
Claude emits a UITree structure:
{
"root": "main",
"elements": {
"main": {
"key": "main",
"type": "Grid",
"props": { "columns": 2, "gap": "md" },
"children": ["metric1", "metric2"]
},
"metric1": {
"key": "metric1",
"type": "Metric",
"props": {
"label": "Revenue",
"valuePath": "/revenue",
"format": "currency"
}
},
"metric2": {
"key": "metric2",
"type": "Metric",
"props": {
"label": "Growth",
"valuePath": "/growth",
"format": "percent"
}
}
},
"data": {
"revenue": 125000,
"growth": 0.15
}
}
Component Catalog
Claude can ONLY use these components. This is the guardrail.
Layout Components
| Component | Props | Children | Description |
|---|---|---|---|
Card |
title?, description?, padding?: sm|md|lg |
Yes | Container with optional header |
Grid |
columns?: 1-4, gap?: sm|md|lg |
Yes | CSS grid layout |
Stack |
direction?: horizontal|vertical, gap?: sm|md|lg, align?: start|center|end|stretch |
Yes | Flexbox stack |
Data Display
| Component | Props | Children | Description |
|---|---|---|---|
Metric |
label, valuePath, format?: number|currency|percent, trend?: up|down|neutral, trendValue? |
No | Single KPI display |
Chart |
type: bar|line|pie|area, dataPath, title?, height? |
No | Data visualization |
Table |
dataPath, columns: [{key, label, format?: text|currency|date|badge}] |
No | Tabular data |
List |
dataPath, emptyMessage? |
Yes | Rendered list from array |
What ships with it
4 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.
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.
- 6d ago First seen · 278 lines · 54 tokens per session scan A 7d499ca410a4
json-render-ui is a skill published in the GitHub repository oaustegard/claude-skills (147 stars, last pushed today), licensed MIT. It adds 54 tokens to every session and 2,205 once invoked, about $0.0003 per session on Opus 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 2026-09-03.
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