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System Requirements

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Operating environment

  • Node.js: OnCall CLI requires Node.js 18+.
    • Install from your OS package manager or from nodejs.org.
    • Use node -v to verify you are on 18.x or later.
  • Package manager: npm (or another Node‑compatible package manager) to install oncall-cli.
  • Shell: Any shell that can run Node‑based CLIs and your app commands (for example, Bash, Zsh, or a POSIX‑like shell).
    • On Windows, running inside WSL or a Unix‑like shell is recommended.

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Network connectivity

  • OnCall API and WebSocket
    • HTTPS access to the API base URL configured in the CLI (default: https://api.oncall.build/v2/api).
    • WebSocket access to the debugging endpoint (default: wss://api.oncall.build/v2/ws).
    • These are required for authentication, AI processing, and streaming responses to your terminal.
  • Local cluster server
    • When using oncall cluster, port 4466 must be available on the machine running the cluster server (or whatever port you configure).
    • All services that participate in the same project id must be able to reach the cluster server URL (default: ws://127.0.0.1:4466).

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File system and project layout

  • Each service you want to debug should have:
    • An accessible project directory (your app’s source and dependencies).
    • An oncall.yaml file in that directory describing:
      • id (project ID used for clustering),
      • description, name,
      • window_id,
      • logs_available, code_available.
  • The user running OnCall CLI must have read access to:
    • The project’s code files (for read_file / grep_search if code_available: true).
    • Any logs produced by the command being wrapped (for log tools when logs_available: true).

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OnCall service and dashboard

  • OnCall’s managed debugging service and dashboard are hosted for you; you do not need to run this service locally.
  • You do need:
    • A valid API key from the OnCall dashboard (stored via oncall login <api-key>).
    • Browser access to the dashboard to view usage (tokens, current usage bar, and usage‑by‑date chart) associated with your key.
If your environment meets these requirements, you can install oncall-cli, log in with your API key, and start debugging using the flows described in the quickstart and common workflows docs.