Connect your own agent
Drive Prototyper from Claude Code, Codex, or any MCP client — and generate on the agent subscription you already pay for.
Prototyper runs an MCP server. Point your coding agent at it and that agent can read and write your workspace directly — create files, edit the canvas, ship a prototype — without going through the in-app composer.
This is what "bring your own agent" means, and it is the reason the Free plan is genuinely usable. Generation runs on your agent and your AI subscription, so it doesn't touch the platform's weekly message allowance at all. If you already pay for Claude Code or Codex, you already have everything you need.
Connect in one command
Run one of these in your terminal, then complete the authorization prompt your editor shows you.
Claude Code
claude mcp add --transport http prototyper https://www.prototyper.co/api/mcpCodex
codex mcp add prototyper --url https://www.prototyper.co/api/mcpAny other MCP-capable client works too — point it at
https://www.prototyper.co/api/mcp over streamable HTTP and authorize.
The onboarding wizard runs this same step and can verify the connection for you. You can also re-run it any time.
Confirm it worked
Two places tell you the truth:
- Settings → MCP clients lists every agent you've authorized, when it last called us, and what it's allowed to do. Revoke any of them from here.
- The MCP button in the composer shows the connection state, and once you're connected it hands your agent a prompt to open the current workspace.
What your agent can do
Once connected, your agent works against a real filesystem view of the workspace. It can list and read files, write and patch them, run commands, and manipulate canvas objects — the same surface the in-app agent uses.
The practical shape of it: describe what you want in Claude Code, watch it land on the canvas.
Quota, honestly
| Platform composer | Your own agent | |
|---|---|---|
| Runs on | Prototyper's AI credit | Your Claude Code / Codex subscription |
| Free plan | 5 messages / week | Unlimited |
| Costs you | Nothing until you upgrade | Whatever you already pay your agent provider |
Connecting an agent doesn't unlock the in-app composer's message allowance — that stays on your plan. It gives you a second, uncapped way to do the work. Most people on Free end up doing both: the composer for quick edits, their own agent for the heavy lifting.
Revoking access
Settings → MCP clients → Revoke. That kills every token in the client's family immediately; the agent has to re-authorize to get back in.