Fly.io MCP
UnknownFly.io MCP is the official server built into flyctl (fly mcp server): inspection and management of Fly.io apps, including low-level Firecracker-based Machines, TLS certificates, logs and volumes. It runs over stdio, SSE or HTTP, whichever you choose; authorization uses an already-open fly auth login session, with no separate API key needed.
Why this server
- Built into flyctl — turned on with fly mcp server, no separate install
- Access to Machines — low-level Firecracker VMs, not just the app-level abstraction
- Auth via an already-open fly auth login session — no new token to issue
- Three transports to choose from — stdio, SSE or HTTP — for local or remote use
Usage examples
Prompt: Which Machines are currently running for my-app, and in what region?
Result: The agent listed the Machines via Fly.io MCP and returned their statuses and regions (fra, iad, and more).
Prompt: Show my-app's logs from the last 15 minutes — looking for the cause of 500 errors
Result: Fly.io MCP returned the log lines for that window, and the agent flagged a recurring database connection error.
Health
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