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deepseek-harness/packages/mode/README.md
2026-07-20 23:28:07 +08:00

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# mode/ — session-mode policy family
Session modes: named, logged, per-agent collaboration states, with **plan mode** as the first shipped definition. A single **product** package — there is no interface/implementation seam here, because a mode's variable part is a config value (the section text), not a swappable implementation.
| Package | Role | ctx key |
|---|---|---|
| `mode/` | `mode/set` vocabulary + fold, the `ctx.modes` service (list/get/set with the turn-boundary flush), the `mode:policy` guidance section, and the model-facing `exit_plan_mode` review tool | `ctx.modes` |
The mode in force is a pure function of the session log (`SessionEventMap['mode/set']`, last one wins), so resume and fork restore it with no extra machinery; the default mode is the absence of policy, keeping the plugin invisible until a mode is set. UIs read flips off `session/event`; the [ACP bridge](../ui/acp) maps the vocabulary to the session-mode picker. Design: [plan-mode Agent Note](../../.agents/notes/implemented/feature/2026-07-07-plan-mode.md).