MCP server that drives Google Flow (Veo / Nano Banana) through its internal tRPC API, with a hard credit-cost gate
An MCP server that lets an agent drive Google Flow (labs.google's Veo video / Nano Banana image tool) — with a hard credit-cost gate so it cannot quietly spend your money.
Flow has no public API. This server does not work around that by blindly clicking buttons: Flow's frontend is a tRPC client, so an undocumented API exists, and this speaks that API first. Clicking is the fallback, not the interface.
Status: v0.1, uncalibrated. Everything compiles, 33 unit tests pass, and the tool surface loads — but the DOM selectors and the tRPC endpoint map have not yet been re-verified against live Flow from this codebase. Run the calibration in First run before trusting it with credits; all three steps are free. See Verification status for exactly what is and is not proven.
- Why it is built this way - Transport ladder - Install · Connect a browser · Register with Claude Code - First run - Tools · Feature coverage - Examples · Credit reference - Verification status · Security - Architecture deep-dive · Contributing · Changelog
Read ARCHITECTURE.md for the full reasoning. The short version:
- Flow's UI is an agent-chat, not a form. You send a request, Flow's agent proposes a generation with a quoted credit cost, and nothing is charged until you approve. So the right design reads the quote and decides — it never fires and reconciles afterwards. - Rejecting a proposal is free. flowestimatecost is therefore not an estimate; it is the real price, at zero cost. - Stills are free, video is real money. The tools are shaped around the workflow that yields accepted clips at minimum spend:
From the project README.
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MCP server for controlling Google Flow (Veo, Nano Banana) with AI agents from your own browser.
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