Hooks & Adapters

Small Python functions that prepare the environment or collect results.

Where they live

• Under hooks/ in your BRS, importable as modules.

Referencing hooks

• In template_config.yaml or workflow.yaml: ``` hooks: pre_render:
  • hooks.prepare:main post_render:
  • hooks.prepare:main pre_run:
  • hooks.env:init post_run:
  • hooks.collect:main ```
• Use module:function or just module (defaults to main).

Hook signature

# hooks/env.py
def main(ctx):
    # set up environment, validate inputs, etc.
    return None

Common patterns

• Modules: load cluster modules or set PATHs.
• Conda/venv: activate environments before running tools.
• Containers: prepare singularity/docker invocations.
• Collection: summarize outputs or write auxiliary metadata files.