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5. Trigger Orchestrator

A declarative pipeline that spawns sessions in response to events (schedule, push, comment, label, manual). Lives ABOVE the thread, deciding when work begins and what initial context it carries.

INDUSTRY TERMS: “workflow”, “hook”, “automation”, “trigger”.

WHEN TO USE: cross-session work where a stimulus (PR opened, file changed, time elapsed) needs to start an agent run with predefined inputs and an upstream-side filter.

KEY PROPERTY: it is the only primitive whose execution surface is fully declarative. It does not carry a context window itself; it dispatches others that do.

See also

Section titled “See also”
  • Module Entrypoint — substrate-invoked binding mode is what triggers dispatch.
  • Child-Thread Spawn — triggers spawn child threads, never carry their own.
  • A trigger surface example (gh-aw / GitHub Agentic Workflows) and its substrate fields (SANDBOXING / CAPABILITY_GATING / AUDIT_SURFACE) will be cross-linked from the Reference catalogue once published.