Use this skill whenever building, testing, or integrating Farcaster Mini Apps. Triggers on: setting up FC Mini App testing infrastructure, writing Playwright tests for Mini Apps, implementing the Farcaster SDK postMessage protocol in a host emulator, scaffolding Mini App projects with Ralph, or any task involving @farcaster/miniapp-sdk integration testing. Always use this skill before writing any FC host emulator code or FC-related Playwright tests — it contains critical protocol details that are not obvious from the SDK docs.
A reusable test harness for Farcaster Mini Apps. The harness lives at: