Borrowing it
Nothing to install: this file belongs to OlliMakarova/mcp-metro. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/OlliMakarova/mcp-metro/master/.claude/skills/mcp-app-add-to-server/SKILL.mdgit clone --depth 1 https://github.com/OlliMakarova/mcp-metroWrote 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/ollimakarova/mcp-metro/mcp-app-add-to-server)<a href="https://agentmods.dev/skills/ollimakarova/mcp-metro/mcp-app-add-to-server"><img src="https://agentmods.dev/badge/skills/ollimakarova/mcp-metro/mcp-app-add-to-server/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/ollimakarova/mcp-metro/mcp-app-add-to-server"><img src="https://agentmods.dev/badge/skills/ollimakarova/mcp-metro/mcp-app-add-to-server.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 | $0.00097 | $0.04303 |
| Opus 5 | $0.00048 | $0.02152 |
| Sonnet 5 | $0.00019 | $0.00861 |
| Haiku 4.5 | $0.00010 | $0.00430 |
Grade A, and why
mcp-app-add-to-server 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 11d 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 mcp-app-add-to-server — 12 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.
How it starts
The opening of the file, as written. The whole thing — 444 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add UI to MCP Server
Enrich an existing MCP server's tools with interactive UIs using the MCP Apps SDK (@modelcontextprotocol/ext-apps).
How It Works
Existing tools get paired with HTML resources that render inline in the host's conversation. The tool continues to work for text-only clients — UI is an enhancement, not a replacement. Each tool that benefits from UI gets linked to a resource via _meta.ui.resourceUri, and the host renders that resource in a sandboxed iframe when the tool is called.
Preferred pattern: reference the widget via
_meta.ui.resourceUri. Linking a tool to a separately registeredui://resource (the tool declares_meta.ui.resourceUri; the host fetches the HTML withresources/read) is the recommended way to add UI, and the one this skill uses throughout. Prefer it over embedding theui://resource inline in the tool result'scontent[]. The referenced form lets the host fetch and cache the static shell once, review its_meta.ui(CSP, permissions, domain) before rendering, and know the widget exists before the call — which is what enables app-only tools (visibility: ["app"]) and the "UI" badge / "Launch widget" button in the Agent Tester Inspector. Reserve the embedded form for quick, one-off, fully data-dependent widgets.
Getting Reference Code
Clone or update the MCP Apps SDK repository (@modelcontextprotocol/ext-apps) using the bundled
helper. The folder ./mcp-ext-apps/ is already in .gitignore and is intentionally persistent —
it serves as the long-lived reference checkout that this skill (and the mcp-app-create skill)
read from. Do not delete it after use.
node scripts/clone-mcp-ext-apps.js --tag latest
The script clones into ./mcp-ext-apps/ on first run, pulls the default branch on subsequent
runs, and (with --tag latest) checks out the latest released npm tag so the cloned tree
matches the published @modelcontextprotocol/ext-apps version. Add --json to capture machine-
readable metadata (path, ref, commit) for downstream automation.
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.
- 11d ago First seen · 444 lines · 97 tokens per session scan A ce332e723966
mcp-app-add-to-server is a skill published in the GitHub repository OlliMakarova/mcp-metro (0 stars, last pushed 1mo ago), licensed MIT. It adds 97 tokens to every session and 4,303 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. It is 92% identical to mcp-app-add-to-server, differing in 12 lines, and is treated as a copy.
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