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 olaservo/mcp-agent-skills --skill mcp-apps-tsgit clone --depth 1 https://github.com/olaservo/mcp-agent-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/olaservo/mcp-agent-skills/mcp-apps-ts)<a href="https://agentmods.dev/skills/olaservo/mcp-agent-skills/mcp-apps-ts"><img src="https://agentmods.dev/badge/skills/olaservo/mcp-agent-skills/mcp-apps-ts/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/olaservo/mcp-agent-skills/mcp-apps-ts"><img src="https://agentmods.dev/badge/skills/olaservo/mcp-agent-skills/mcp-apps-ts.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 | $0.00067 | $0.03989 |
| Opus 5.5 | $0.00027 | $0.01596 |
| Sonnet 5.5 | $0.00013 | $0.00798 |
| Haiku 4.5 | $0.00007 | $0.00399 |
Grade A, and why
mcp-apps-ts 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 2mo 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 — 419 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Apps Host Development & Reference
Build applications that embed MCP App UIs using AppBridge, with comprehensive reference documentation.
This is an experimental extension. MCP Apps enables servers to deliver interactive HTML UIs that run in sandboxed iframes, allowing rich visual interfaces while maintaining security.
When to Use This Skill
Use this skill when:
- Building a host application that embeds MCP App UIs (chat app, IDE plugin, agent interface)
- Implementing AppBridge for iframe communication, tool routing, and security
- Developing multi-server hosts with tool aggregation and UI routing
- Learning MCP Apps architecture without cloning the ext-apps repository
- Referencing the complete API for App, AppBridge, and React hooks
For creating MCP App servers or UIs: Use the official create-mcp-app skill first - it provides guided project scaffolding. This skill's server/app snippets are supplementary reference material.
Install official skills via:
/plugin marketplace add modelcontextprotocol/ext-appsornpx skills add modelcontextprotocol/ext-apps
React Hosts: For React-based host applications, consider
@mcp-ui/clientwhich provides ready-made React components for rendering MCP Apps. See mcpui.dev documentation. This skill focuses on lower-level AppBridge integration for custom hosts.
Tip: Stay up to date! MCP Apps is under active development. Before starting, check the ext-apps repository for:
- Open Pull Requests - upcoming changes
- Issues - known bugs and feature requests
- Recent Commits - latest changes
- Releases - version history
What ships with it
30 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.
- manifest.json 6.0 KB
- README.md 5.7 KB
- reference/mcp_apps_api_reference.md 21 KB
- reference/mcp_apps_architecture.md 16 KB
- snippets/app/app-react-basic.tsx 7.2 KB
- snippets/app/app-react-with-styles.tsx 6.0 KB
- snippets/app/app-vanilla-basic.ts 2.0 KB runs code
- snippets/app/app-vanilla-full.ts 7.1 KB runs code
- snippets/app/app-with-display-mode.ts 4.3 KB runs code
- snippets/app/app-with-model-context.ts 7.4 KB runs code
- snippets/app/tool-calling.ts 5.7 KB runs code
- snippets/host/app-bridge-basic.ts 4.5 KB runs code
- snippets/host/app-bridge-handlers.ts 5.5 KB runs code
- snippets/host/host-full-integration.ts 9.6 KB runs code
- snippets/host/host-multi-server.ts 14 KB runs code
- snippets/host/sandbox-proxy.html 7.7 KB
- snippets/scaffold/vanilla-server/mcp-app.html 1.0 KB
- snippets/scaffold/vanilla-server/package.json 1.0 KB
- snippets/scaffold/vanilla-server/README.md 3.4 KB
- snippets/scaffold/vanilla-server/server-utils.ts 1.9 KB runs code
- snippets/scaffold/vanilla-server/server.ts 3.5 KB runs code
- snippets/scaffold/vanilla-server/src/global.css 148 B
- snippets/scaffold/vanilla-server/src/mcp-app.css 1.0 KB
- snippets/scaffold/vanilla-server/src/mcp-app.ts 4.5 KB runs code
- snippets/scaffold/vanilla-server/tsconfig.json 494 B
- snippets/scaffold/vanilla-server/vite.config.ts 554 B runs code
- snippets/server/resource-with-csp.ts 3.8 KB runs code
- snippets/server/server-with-private-tools.ts 5.6 KB runs code
- snippets/server/tool-with-structured.ts 3.0 KB runs code
- snippets/server/tool-with-ui.ts 2.5 KB runs 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.
- 2mo ago First seen · 419 lines · 67 tokens per session scan A 7047046aef2e
mcp-apps-ts is a skill published in the GitHub repository olaservo/mcp-agent-skills (2 stars, last pushed 9mo ago), licensed Apache-2.0. It adds 67 tokens to every session and 3,989 once invoked, about $0.0003 per session on Opus 5.5. 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.
mcp-apps-ts compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mcp-apps-tsolaservo/mcp-agent-skills | Skill | 2 | 9mo ago | Apache-2.0 | A | 67 | Claude Code |
| imagegenopenai/codex | Skill | 134k | today | Apache-2.0 | A | 113 | Codex |
| local-ai-agentsmicrosoft/ai-agents-for-beginners | Skill | 79k | today | MIT | A | 200 | Claude Code, Codex |
| playwright-climicrosoft/playwright | Skill | 99k | today | Apache-2.0 | A | 19 | Claude Code |
| systematic-debuggingobra/superpowers | Skill | 314k | 4d ago | MIT | A | 21 | Claude Code |
| next-cache-components-adoptionvercel/next.js | Skill | 143k | today | MIT | A | 95 | Claude Code |
| chat-pet-sprite-creationmicrosoft/vscode | Skill | 195k | today | MIT | A | 53 | Claude Code, Codex |