OnceRun once. Reuse anywhere.

Once makes project scripts cacheable, observable, and remotely executable.

Scripts stay scripts

Keep the shell, Node, Python, Ruby, or other scripts you already have. Add a small execution contract instead of rewriting them as build rules.

Learn about scripts

Inputs, outputs, environment variables, working directories, and timeouts become part of the action contract.

The same script contract can run locally or on a compute provider with `--remote`.

Runtime sessions expose structured logs, events, and control over JSON-RPC instead of forcing agents to scrape terminal output.