Borrowing it
Nothing to install: this file belongs to Bazilio-san/mcp-vkusvill. 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/Bazilio-san/mcp-vkusvill/master/.claude/skills/mcp-app-add-to-server/SKILL.mdgit clone --depth 1 https://github.com/Bazilio-san/mcp-vkusvillWrote 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/bazilio-san/mcp-vkusvill/mcp-app-add-to-server)<a href="https://agentmods.dev/skills/bazilio-san/mcp-vkusvill/mcp-app-add-to-server"><img src="https://agentmods.dev/badge/skills/bazilio-san/mcp-vkusvill/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/bazilio-san/mcp-vkusvill/mcp-app-add-to-server"><img src="https://agentmods.dev/badge/skills/bazilio-san/mcp-vkusvill/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 | $0.04080 |
| Opus 5 | $0.00048 | $0.02040 |
| Sonnet 5 | $0.00019 | $0.00816 |
| Haiku 4.5 | $0.00010 | $0.00408 |
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 12d 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
1 near-identical copy found in the catalogue:
- mcp-app-add-to-server — 92% identical, 12 lines differ
How it starts
The opening of the file, as written. The whole thing — 434 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.
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.
Protocol Specification
The formal MCP Apps spec lives in the same repository — read it for authoritative protocol semantics that source files and examples only illustrate:
| File | Contents |
|---|---|
./mcp-ext-apps/specification/2026-01-26/apps.mdx |
SEP-1865 (Stable, 2026-01-26) — ui:// URI scheme, _meta.ui contract, iframe sandboxing, host↔UI JSON-RPC messages, security model |
Where to look first:
- For protocol questions (wire format, required
_metakeys, mandatory host/server behaviors, message semantics) — consult./mcp-ext-apps/specification/2026-01-26/apps.mdx. The spec is the source of truth for what MUST happen. - For TypeScript API questions (which helper to call, handler signatures, idiomatic usage) —
consult
@modelcontextprotocol/ext-appssources under./mcp-ext-apps/src/and its examples. The package is the source of truth for how to invoke the protocol from code.
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.
- 12d ago First seen · 434 lines · 97 tokens per session scan A 94b7c701e991
mcp-app-add-to-server is a skill published in the GitHub repository Bazilio-san/mcp-vkusvill (1 stars, last pushed 2mo ago), licensed MIT. It adds 97 tokens to every session and 4,080 once invoked, about $0.0005 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 2026-08-31.
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