fitfly engine for ChatGPT

io.github.dropflyai/fitfly-engine

Deterministic fitness coaching engine: adaptive programs, progression math, readiness autoregulation

client:ChatGPT transport:streamable-http tools:10

Install fitfly engine in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://workout-engine-production-5dd7.up.railway.app/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs