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Remote MCP Deployment Options

ModusBrain’s MCP server runs via modusbrain serve (stdio transport). To make it accessible from other devices and AI clients, run modusbrain serve --http (built-in HTTP transport with bearer auth, Postgres-only … see DEPLOY.md) behind a public tunnel. Here are your tunnel options. ngrok provides instant public tunnels. The Hobby tier ($8/mo) gives you a fixed domain that never changes.
See the ngrok-tunnel recipe for full setup including auth token configuration and fixed domain setup.

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Tailscale Funnel

Tailscale Funnel gives you a permanent public HTTPS URL with automatic TLS. Free tier available. Best for private networks where you control both endpoints.

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Fly.io / Railway (always-on)

For production deployments that need to run 24/7 without your machine:
  • Fly.io: $5-10/mo, global edge, fly deploy
  • Railway: $5/mo, git push deploy
Both run Bun natively. No bundling, no Deno, no cold start, no timeout limits.

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Comparison

Note: modusbrain serve --http is the built-in HTTP transport (v0.22.7+). Bearer auth against the access_tokens table, default-deny CORS, two-bucket rate limit, body cap, per-request audit log. Postgres-only by design (PGLite is local-only). See DEPLOY.md and SECURITY.md for env vars and tunables.