**DESCRIPTION**:
1. Create and activate a task-specific workflow when no workflow in `<workflow_activation_options>` fits the user's task.
2. A created workflow cannot be activated again after it is replaced or exits.

**RULES**:
1. Submit a complete workflow definition in one call. Use an ID that differs from each ID in `<workflow_activation_options>` and in `<workflow_chain>`.
2. Define exactly one initial stage and at least one final stage.
3. Each stage is reachable through an acyclic `advance` graph.
4. A final stage has no outgoing `advance` transition, and each other stage has at least one.
5. A final stage has at least one outgoing `rework` transition, because the final stage stays active until exit, and a requested change of its result can need an earlier stage.
6. A `rework` transition targets only a strict `advance` ancestor.
7. When completion of a stage may require a change of output of an `advance` ancestor, a path of `rework` transitions leads from this stage to this ancestor.
8. Completion criteria of a stage use only outputs of this stage and of its `advance` ancestors, because outputs of its `advance` descendants do not exist yet.
9. Set one model and one `thinking` level for the whole workflow; set them per stage only when the user explicitly asks, because a change of model or thinking level within a session invalidates the cache of most providers.
10. General prompt holds only rules that two or more stages apply. A rule of one stage goes to the prompt of this stage.