LEANMCP AI PAL
credits
$1.00
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// Free calls used up
You've used your
1 free credit.
Your 1 free credit covers your first session — add_note(), set_tempo() — Once it is used, buy credits to keep playing.

Buy credits at app.leanmcp.com to keep playing. Same cost as going direct to OpenAI, plus a tiny ~0.5% gateway fee.
01
Go to app.leanmcp.com/billing
02
Buy a credit pack — start small
03
Come back and keep playing
Buy credits → app.leanmcp.com/billing I'm a developer — show me how to build this
// How this demo works
Music Composer
— how it works
You
Type what you want. "Lo-fi jazz riff, C minor, slow." That's it. Your AI Pal handles the rest.
AI Pal
An LLM (GPT-4o or Claude) reads your message and decides which browser tools to call, in what order, to make it happen.
WebMCP
This demo registers tools via navigator.modelContext.registerTool() — the new W3C browser standard. No screenshots. No pixel-clicking. Real JavaScript functions called directly.
Tools
This demo exposes:
Credits
Each tool call hits a real LLM. You get 1 free credit ($1). When it runs out, buy more credits at app.leanmcp.com/billing. Credits are used at cost — roughly $0.04–$0.15 per session.
Gateway
All calls flow through the LeanMCP AI Gateway — every call logged, every cost tracked. The same gateway you can use to monitor your own AI tools (Cursor, Cline, OpenClaw).
All WebMCP demos → Buy credits