Borrowing it
Nothing to install: this file belongs to elbruno/mcpapp-colorpicker. 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/elbruno/mcpapp-colorpicker/master/.claude/skills/migrate-oai-app/SKILL.mdgit clone --depth 1 https://github.com/elbruno/mcpapp-colorpickerWrote 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/elbruno/mcpapp-colorpicker/migrate-oai-app)<a href="https://agentmods.dev/skills/elbruno/mcpapp-colorpicker/migrate-oai-app"><img src="https://agentmods.dev/badge/skills/elbruno/mcpapp-colorpicker/migrate-oai-app/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/elbruno/mcpapp-colorpicker/migrate-oai-app"><img src="https://agentmods.dev/badge/skills/elbruno/mcpapp-colorpicker/migrate-oai-app.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 | $0.00081 | $0.01999 |
| Opus 5.5 | $0.00032 | $0.00800 |
| Sonnet 5.5 | $0.00016 | $0.00400 |
| Haiku 4.5 | $0.00008 | $0.00200 |
Grade A, and why
Migrate from OpenAI App 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.
This is a copy
98% identical to migrate-oai-app — 2 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 — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Migrate OpenAI App to MCP
Migrate existing OpenAI Apps SDK applications to the MCP Apps SDK (@modelcontextprotocol/ext-apps). The MCP Apps SDK provides a standardized, open protocol for interactive UIs in conversational clients.
Best Practices
- Use your package manager to add dependencies (e.g.,
npm install,pnpm add,yarn add) instead of manually writing version numbers. This lets the package manager resolve the latest compatible versions. Never specify version numbers from memory. - Preemptively add a final todo item with this exact wording: "Re-read the 'Before Finishing' checklist in this skill and address each checkbox individually, stating what you did for each one, before marking this todo complete."
Getting Reference Code
Clone the SDK repository for complete migration documentation and working examples:
git clone --branch "v$(npm view @modelcontextprotocol/ext-apps version)" --depth 1 https://github.com/modelcontextprotocol/ext-apps.git /tmp/mcp-ext-apps
Migration Reference Guide
Read the migration reference guide with "before/after" mapping tables: /tmp/mcp-ext-apps/docs/migrate_from_openai_apps.md
API Reference (Source Files)
Read JSDoc documentation directly from /tmp/mcp-ext-apps/src/*:
| File | Contents |
|---|---|
src/app.ts |
App class, handlers, lifecycle |
src/server/index.ts |
registerAppTool, registerAppResource |
src/spec.types.ts |
Type definitions |
src/react/useApp.tsx |
useApp hook for React apps |
src/react/use*.ts* |
Other use* hooks for React apps |
Front-End Framework Examples
See /tmp/mcp-ext-apps/examples/basic-server-{framework}/ for basic SDK usage examples organized by front-end framework:
| Template | Key Files |
|---|---|
basic-server-vanillajs/ |
server.ts, src/mcp-app.ts, mcp-app.html |
basic-server-react/ |
server.ts, src/mcp-app.tsx (uses useApp hook) |
basic-server-vue/ |
server.ts, src/App.vue |
basic-server-svelte/ |
server.ts, src/App.svelte |
basic-server-preact/ |
server.ts, src/mcp-app.tsx |
basic-server-solid/ |
server.ts, src/mcp-app.tsx |
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 · 168 lines · 81 tokens per session scan A 172e2284e4f1
Migrate from OpenAI App is a skill published in the GitHub repository elbruno/mcpapp-colorpicker (13 stars, last pushed 7mo ago), licensed MIT. It adds 81 tokens to every session and 1,999 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 98% identical to migrate-oai-app, differing in 2 lines, and is treated as a copy.
Migrate from OpenAI App compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| Migrate from OpenAI Appelbruno/mcpapp-colorpicker | Skill | 13 | 7mo ago | MIT | A | 81 | Claude Code |
| collatticeMrBildo/collattice | Skill | 8 | 10d ago | MIT | A | 111 | Claude Code, Codex |
| wpfvisualtreemcpfaze79/WPFVisualTreeMcp | Skill | 21 | 11d ago | MIT | A | 85 | Claude Code, Codex |
| publish-releaseByggarepop/dotnet-mcp-orchestrator | Skill | 2 | 17d ago | MIT | A | 63 | Claude Code, Codex |
| console-logIvanMurzak/MCP-Plugin-dotnet | Skill | 21 | yesterday | Apache-2.0 | B | 10 | Claude Code, Codex |
| home-memory-documentationimpactjo/home-memory | Skill | 77 | 13d ago | AGPL-3.0 | A | 112 | Claude Code, Codex |
| release-notesByggarepop/dotnet-mcp-orchestrator | Skill | 2 | 17d ago | MIT | A | 39 | Claude Code, Codex |