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A DAG-Based Workflow Orchestration Engine for Elixir

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README.md 

# Gust



Gust is a DAG-based workflow orchestration engine for Elixir.



## Runtime roles



Set `GUST_ROLE` to control which parts of the runtime start:



- `single`: default mode; runs the web-facing and execution-oriented parts together.

- `core`: runs DAG scheduling and execution workers without the web UI.

- `web`: loads DAG definitions for the UI, but does not run DAG execution workers.

- `console`: loads DAG definitions and supporting runtime services for CLI or IEx usage, but skips DAG pooling workers.



## Console usage



Use `console` when you want to inspect DAGs, run CLI commands, or open IEx without starting execution workers:



```zsh

GUST_ROLE=console iex -S mix

mix gust.cli your_command_here

```



The `mix gust.cli` task defaults `GUST_ROLE` to `console` automatically, and release builds provide a `gust-cli` wrapper with the same behavior.



## Guides



- [Writing DAGs](guides/writing_dags.md) — the `Gust.DSL` in practice.

- [Configuration](guides/configuration.md) — run dispatcher config and DAG

  adapters.

- [Gust Roles](guides/roles.md) — `GUST_ROLE` and multi-node setup.

- [Error Tracking](guides/error_tracking.md) — reporting terminal task

  failures.