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docs(agent): document next-step acceptance window

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_Kerman
2026-07-27 18:07:51 +08:00
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packages/core/agent-loop/README.md
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@@ -54,7 +54,7 @@ Configured agents start automatically. A model call requires both `provider` and
The concrete `ReactLoopAgent`, its queued input, outbox, and run controls are package-internal. The package root exports only the plugin/service/config contract, and the package exports map exposes no `./src/*` escape hatch; lifecycle owners create agents through `ctx.agents` rather than naming, constructing, or starting driver internals. One prepared session can be claimed by only one concrete driver, and everything observable happens through session events and the `agent/*` event taxonomy.
The unified `send()` primitive routes content and source by (`target` × `wakeup`); `followup`/`steer`/`inject` are its fixed-preset aliases. A `next-turn` item joins the queued FIFO, waking the driver unless `wakeup: false`; admission happens before any turn opens. An allowed prompt and the prompt waterfall's `additionalContexts` enter the outbox as separate messages, then `run()` opens the turn and drains them together. A running `next-step`/wakeup `steer()` enters the same outbox without prompt admission and normally causes another step. A `next-step`/no-wakeup `inject()` waits there only while a turn is open; while idle it appends a `user/message` immediately without opening a turn or running the model. Persistence owns the resulting eager drain. Every inbox enqueue publishes `agent/inbox/enqueue`; taking it publishes `agent/inbox/dequeue`, and `cancel()` without `keepInbox` publishes `agent/inbox/discard`.
The unified `send()` primitive routes content and source by (`target` × `wakeup`); `followup`/`steer`/`inject` are its fixed-preset aliases. A `next-turn` item joins the queued FIFO, waking the driver unless `wakeup: false`; admission happens before any turn opens. The loop opens a private next-step acceptance window before `agent/prompt-submit` and closes it before `turn/end`. During that window, `steer()` and `inject()` stage in one outbox; an allowed admission opens the turn, records the prompt and returned `additionalContexts`, then drains the staged input before the first request. A blocked or failed admission writes no prompt or hook-produced context and leaves caller-staged input for retry or a later admitted prompt. Outside the window, steering becomes a waking queued prompt and injection immediately appends `user/message` without opening a turn or running the model. Every inbox enqueue publishes `agent/inbox/enqueue` with the resolved queued-or-steering placement; taking it publishes `agent/inbox/dequeue`, and `cancel()` without `keepInbox` publishes `agent/inbox/discard`.
### Loop lifecycle (`agent.ts`)