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cmux Backend

cmux-backend

Backend TypeScript and Cloud VM development rules for cmux. Use when editing web/app/api, web/services, backend scripts, Cloud VM lifecycle, provider integrations, Postgres, Stack Auth pricing gates, migrations, or provider image build scripts.

manaflow-ai/cmux4.5Kinstalls27.6Kstars

SKILL.md

Full skill instructions

cmux Backend

Core rules

  • Default backend TypeScript to Effect under web/​app/​api/​**, web/​services/​**, and backend scripts touching providers, databases, auth, rate limits, retries, timeouts, or telemetry.
  • Keep Next route handlers thin: parse the request, run one Effect program at the boundary, map typed errors to HTTP responses, treat unexpected defects separately.
  • Plain TypeScript is for trivial data shapes, constants, config files, frontend React, and small glue where Effect would add ceremony without improving failure handling.
  • Cloud VM backend logic stays in Vercel route handlers and Effect services backed by Postgres. Do not reintroduce Rivet or a raw actor protocol unless a later architecture doc explicitly changes the control plane.
  • Postgres is the source of truth for VM lifecycle, active VM limits, idempotency, and usage events.
  • Production and staging Cloud VM Postgres use PlanetScale PostgreSQL database cmux-prod in organization cmux. The runtime reads DATABASE_URL with CMUX_DB_DRIVER=url; migration jobs use the protected DATABASE_URL secret. AWS credentials are not database credentials.
  • Run production/​staging migrations with bun run cloud-vm:migrate -- staging followed by -- production; never from Vercel build or route startup. Local dev keeps the CMUX_PORT-derived Docker Postgres path from bun dev.
  • Cloud VM create pricing gates use Stack Auth team payment items when enabled.

Secrets

Cloud VM build, test, and local dev scripts read provider secrets from ~/​.secrets/​cmux.env: FREESTYLE_API_KEY and the R2 upload vars web/​scripts/​build-cloud-vm-images.ts needs when creating Freestyle snapshots.

set -a
source ~/​.secrets/​cmux.env
set +a

~/​.secrets/​cmuxterm-dev.env holds local Stack/​web env and not the provider build keys. bun dev sources ~/​.secrets/​cmux.env first when present, then ~/​.secrets/​cmuxterm-dev.env, so cmuxterm-specific Stack settings override broader cmux secrets. The web dev loader still accepts the legacy ~/​.secret/​cmuxterm.env and ~/​.secrets/​cmuxterm.env paths while machines migrate.

Detailed references

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