The shared home for background-task ids, owner isolation, reads, cancellation, waiting, and completion notices. Bash, subagents, and future long-running tools use one model-facing protocol. See the [background-task runtime Agent Note](../../.agents/notes/implemented/architecture/2026-06-20-generic-long-running-tool-runtime.md) and the [task-registry seam Agent Note](../../.agents/notes/implemented/architecture/2026-07-26-task-registry-seam.md).
| [`tool-tasks`](tool-tasks/README.md) (`@deepseek-ai/dsh-tool-tasks`) | — | The model-facing control surface: `task_output`, `task_list`, `task_kill`, the completion-notice injection, and the background-habit prompt section |
The registry owns state across producer or surface reloads; the tool package owns presentation. Producers register execution hooks through `ctx.tasks.start` and own whether their config exposes `run_in_background`.