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 carsxe/carsxe-mcp-server --skill mcp-apps-uigit clone --depth 1 https://github.com/carsxe/carsxe-mcp-serverWrote 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/carsxe/carsxe-mcp-server/mcp-apps-ui)<a href="https://agentmods.dev/skills/carsxe/carsxe-mcp-server/mcp-apps-ui"><img src="https://agentmods.dev/badge/skills/carsxe/carsxe-mcp-server/mcp-apps-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/carsxe/carsxe-mcp-server/mcp-apps-ui"><img src="https://agentmods.dev/badge/skills/carsxe/carsxe-mcp-server/mcp-apps-ui.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 | $0.00044 | $0.00211 |
| Opus 5 | $0.00022 | $0.00105 |
| Sonnet 5 | $0.00009 | $0.00042 |
| Haiku 4.5 | $0.00004 | $0.00021 |
Grade A, and why
mcp-apps-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 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.
What it actually says
MCP Apps UI (data → render)
Do not attach a widget to fetch tools. Call the data tool first, then the matching render tool.
| Data tool | Render tool | UI resource |
|---|---|---|
get_vehicle_specs |
render_vehicle_card |
ui://carsxe/vehicle-card.html |
get_market_value |
render_market_value |
ui://carsxe/market-value.html |
get_vehicle_recalls |
render_recalls |
ui://carsxe/recalls.html |
Pass the data tool's structuredContent fields into the render tool. Auth stays API key / OAuth. Preview mock cards with npm run preview:ui and open previews/*.html.
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.
- yesterday First seen · 17 lines · 44 tokens per session scan A f02e86824409
mcp-apps-ui is a skill published in the GitHub repository carsxe/carsxe-mcp-server (0 stars, last pushed 2d ago), licensed MIT. It adds 44 tokens to every session and 211 once invoked, about $0.0002 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 2026-09-12.
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