OptionalbranchWorking directory the harness runs in: a checkout of the run branch.
OptionalresumeA prior harness session to continue (#181), set by the engine when this is
a retry of the same role+task+round and the previous attempt reported one.
The seam passes it only to an adapter whose manifest declares resume_args;
every other runner ignores it and starts fresh, as does a new round.
OptionalroundOptionalslugRun identity (optional): the engine always sets these; HeadlessDispatcher ignores them.
OptionaltaskTask/round identity (optional, task-scoped roles only): the engine always sets these from the dispatch intent (null for non-task-scoped roles); HeadlessDispatcher ignores them. RemoteDispatcher (runner-dispatcher.ts) keys its pending map directly from these fields, so a parallel same-role dispatch (e.g. two implementers on distinct tasks) correlates on the request itself rather than on dispatch or poll order (ADR-7).
Run-specific prompt body; the adapter's template wraps it.