Orch Frontier

Require: a run's ticket directory forming a finite acyclic dependency graph, and the run's bound — from the spec, or named by the caller for an ad-hoc set.

Open by dispatching the whole ready frontier — every ticket whose depends_on are all complete — in parallel through orch-task, one dispatch per ticket, no two sharing a write scope; a ticket waiting on a dependency stays pending. Then recompute on every event — a result landing, a suspension parking its item, a claim's lease expiring — never on a schedule of rounds: record what landed in the worklog — the tickets alone are the record when the run keeps none; reclaim stale claims per [rules/delegation.md](../../../rules/delegation.md) §11 (a parked item's claim never goes stale); promote each pending ticket whose depends_on are now all complete to ready; set each pending ticket depending on a failed, blocked, or limited ticket to blocked, naming its blocker — a failure blocks exactly its dependents, the rest of the graph rolls on; dispatch everything newly ready immediately. A suspension parks its item at the event step — neither complete nor failed, its dependents wait: the caller satisfies the excluded action at that step and re-readies the ticket; a caller that cannot satisfy it exits with the parked remainder — resume is its own caller's re-dispatch, never this engine's. The engine exits when no ticket is ready or pending and no live dispatch remains — parked items return in the open remainder — and exits limited when the run bound is spent with tickets still open; bounds inherit downward.

Never: start a dependent before its dependencies are complete; hold a ready ticket back to batch it with others; hide a blocked subtree in a summary of the successes; re-order the graph to dodge a failure.

Return: per-ticket results, the graph's terminal state, and the open remainder with what blocks it.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: DanMcInerney
• Source: DanMcInerney/orchflows
• License: MIT

Install and usage instructions live in the source repository linked above.