Xylem

Digital xylem that transports data through workflows with structure and support

Xylem is a workflow runner for composing command-line tools into repeatable, configuration-driven pipelines. A workflow declares ordered modules, inputs, variables, requirements, and execution options in JSON or YAML. Xylem prepares the modules and runs the same ordered pipeline for each input.

The workspace contains two Rust packages:

• xylem-cli provides the xylem command.
• xylem-lib provides configuration, module, interpolation, and execution types used by the CLI.

Execution model

1. Read a JSON or YAML workflow configuration.
2. Check declared host requirements.
3. Prepare local or remote modules and their environments.
4. Resolve workflow, module, and input variables.
5. Execute modules in declaration order for every input.

Inputs may run concurrently. Use the global --threads N option to bound the Rayon work managed by Xylem. Child tools can still create their own threads.

For the stable module-level interface, see the module contract.