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fix(subagent): make strict steering atomic

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This commit is contained in:
Dudu-0223
2026-07-24 11:27:57 +08:00
committed by imccyu
parent 9e5ae0d12e
commit bb8ea2be51
24 changed files with 436 additions and 92 deletions
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24
packages/subagent/subagent-inprocess/src/index.ts
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@@ -276,10 +276,10 @@ function driveTurn(
if (lastBoundary?.type !== 'turn/start') {
throw new Error(`subagent child "${childId}" turn has already closed; the message was not delivered`)
}
// Terminal turn-stops only run between steps: with no step open, the
// loop may be awaiting its continuation/turn-stop checkpoints, where
// pending steering was already folded and a terminal decision discards
// a later arrival. A message accepted during an OPEN step is instead
// Turn settlement only runs between steps: with no step open, the loop
// may be awaiting its continuation/turn-stopping checkpoint, where
// pending steering was already folded and a later arrival would miss
// this turn. A message accepted during an OPEN step is instead
// drained and recorded at that step's settlement checkpoint before any
// terminal decision (cancellation remains the documented shared-outcome
// race).
@@ -289,14 +289,20 @@ function driveTurn(
if (lastStep?.type !== 'step/start') {
throw new Error(`subagent child "${childId}" is between steps; the message was not delivered`)
}
// A committed structured capture makes the pending `agent/turn-stop`
// checkpoint terminal, and the loop then discards late steering. The
// capture is synchronously observable, so reject rather than
// acknowledge a message the run is about to drop.
// A committed structured capture makes the pending step conclusion
// terminal. The capture is synchronously observable, so reject rather
// than acknowledge a message the run is about to drop.
if (structured?.captured() !== undefined) {
throw new Error(`subagent child "${childId}" already reported its structured result; the message was not delivered`)
}
child.steer(createUserMessage({ content, source: { kind: 'user' } }))
// The atomic Agent operation closes before the final drain, so this
// cannot acknowledge content that the current step will not record.
if (child.trySteer === undefined) {
throw new Error(`subagent child "${childId}" agent does not support strict steering; the message was not delivered`)
}
if (!child.trySteer(createUserMessage({ content, source: { kind: 'user' } }))) {
throw new Error(`subagent child "${childId}" passed its steering checkpoint; the message was not delivered`)
}
},
}
}