mcp-apps-development SKILL.md skillB
mcp-apps-development from jnpiyush/agentx is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add jnpiyush/agentx/mcp-apps-development@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- jnpiyush/agentx
- Path
.github/skills/ai-systems/mcp-apps-development/SKILL.md- Versions recorded
- 2
- Latest version
- v1.0.0, committed Sep 15, 2026
- First version recorded
- Mar 3, 2026
- Size
- 12,635 bytes
- Repository stars
- 19
- License
- Apache-2.0
Build MCP Apps (ext-apps) that render interactive UI inside conversational AI clients. Use when creating visual tool outputs, interactive dashboards, form-based tools, or rich media experiences in MCP-compatible hosts like Claude Desktop, VS Code Copilot Chat, or other MCP clients that support the Apps specification.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# MCP Apps Development > Build [MCP Apps](https://github.com/modelcontextprotocol/ext-apps) that render interactive UI inside conversational AI clients using the `@modelcontextprotocol/ext-apps` SDK. ## When to Use - Building MCP tools that display interactive UI (charts, forms, dashboards) - Creating visual resource viewers inside AI chat interfaces - Adding rich media output to existing MCP servers (video, maps, 3D, music) - Migrating OpenAI chat app plugins to the MCP Apps standard - Building fullscreen interactive experiences within MCP-compatible hosts ## When NOT to Use - Building headless MCP servers (tools, resources, prompts only) -> use `mcp-server-development` skill - Creating standalone web applications outside AI clients - Building API integrations without a visual component ## Decision Tree ``` Need interactive UI in an AI chat client? +- Tool with visual output? | +- Register with registerAppTool() | +- Return _meta.ui.resourceUri linking to a resource | - Resource renders the UI via App class +- Standalone visual resource? | +- Register with registerAppResource() | - Resource renders UI, host embeds as iframe +- Migrating from OpenAI plugin? …
Read the whole file at its exact version.
How to install
mdr add jnpiyush/agentx/mcp-apps-development@sha256:d64df78171e61c0fThe line at the top of this page pins the label v1.0.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_kfsplsjq5fag4onz)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Mar 3, 2026 and Sep 15, 2026, about one every 195 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.0 latest | 2026-09-15 | f17c505 | 12,635 B | B | view · diff |
| v1.0.0 | 2026-03-03 | c5ea473 | 12,633 B | B | view |
Audit of the latest version
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (12635 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
jnpiyush/agentx · 19 stars · license Apache-2.0 · pushed 2026-11-04 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_kfsplsjq5fag4onz GET https://markdownregistry.com/api/v1/resolve?ref=jnpiyush/agentx/mcp-apps-development GET https://markdownregistry.com/api/v1/blob/d64df78171e61c0f5b0a6fbea65b27f936e6e07f23a890b665f652e5c9abeb24
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.