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 devtools-sveltegit 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/devtools-svelte)<a href="https://agentmods.dev/skills/vercel-labs/json-render/devtools-svelte"><img src="https://agentmods.dev/badge/skills/vercel-labs/json-render/devtools-svelte/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/devtools-svelte"><img src="https://agentmods.dev/badge/skills/vercel-labs/json-render/devtools-svelte.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00064 | $0.00278 |
| Opus 5.5 | $0.00026 | $0.00111 |
| Sonnet 5.5 | $0.00013 | $0.00056 |
| Haiku 4.5 | $0.00006 | $0.00028 |
Grade A, and why
devtools-svelte 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.
This is a copy
92% identical to devtools-solid — 30 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.
What it actually says
@json-render/devtools-svelte
Svelte 5 adapter for the json-render devtools panel. Read skills/devtools/SKILL.md for the shared panel capabilities, props, docking behavior, and server-side stream taps.
Install
npm install @json-render/devtools @json-render/devtools-svelte
Mount the panel
Mount JsonRenderDevtools inside the existing Svelte json-render provider:
<script>
import { JsonRenderDevtools } from "@json-render/devtools-svelte";
</script>
<JSONUIProvider {registry}>
<Renderer {spec} {registry} />
<JsonRenderDevtools {spec} {catalog} {messages} />
</JSONUIProvider>
The component renders nothing in production builds. The panel provides the shared devtools controls, including the Ctrl/Cmd + Shift + J shortcut. Keep server-side stream instrumentation in @json-render/devtools.
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 · 32 lines · 64 tokens per session scan A 99b85675f5c0
devtools-svelte is a skill published in the GitHub repository vercel-labs/json-render (18,930 stars, last pushed yesterday), licensed Apache-2.0. It adds 64 tokens to every session and 278 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 92% identical to devtools-solid, differing in 30 lines, and is treated as a copy.
devtools-svelte compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| devtools-sveltevercel-labs/json-render | Skill | 19k | yesterday | Apache-2.0 | A | 64 | Claude Code, Codex |
| vue-debug-guidesvuejs-ai/skills | Skill | 3.3k | 14d ago | MIT | A | 36 | Claude Code, Codex |
| error-tracking-sveltePostHog/skills | Skill | 79 | yesterday | MIT | A | 14 | Claude Code |
| vue-debug-guidesonmax/nuxt-skills | Skill | 723 | yesterday | none | A | 36 | Claude Code |
| solid-core-reactivity-modelOpenAEC-Foundation/OpenAEC-Workspace-Composer | Skill | 6 | 1mo ago | MIT | A | 97 | Claude Code |
| vite-mcp-nextxiaou66/vite-plugin-vue-mcp-next | Skill | 19 | 5mo ago | MIT | A | 45 | Claude Code, Codex |
| error-tracking-nuxtPostHog/skills | Skill | 79 | yesterday | MIT | A | 15 | Claude Code |