Module spawn 

Sub-session spawn scheduler.

Provides a background queue for spawning child sessions. Spawn is async (tool returns immediately), but the UI can observe child progress via events forwarded to the parent session stream.

Structs

ChildLaunchGuard

QueueCapacityReservation

One in-memory queue slot, not an execution grant. Dropping it releases capacity without publishing a job or Start. The original cancellation gate stays bound to the reservation and cannot be replaced before commit.

SessionInboxRuntimeBinding

Runtime-scoped durable inbox resources used by external actor drivers.

SpawnContext

SpawnJob

SpawnScheduler

Traits

ChildRunLaunchHook

Optional application-layer preparation for a child run launched through the canonical scheduler.

ExternalChildRunner

Trait for external child session runtimes (e.g. A2A, CLI adapters).

Type Aliases

QueueAdmissionCheck

A process-local Host admission check, evaluated at the synchronous queue commit after capacity waits. It must not block or perform I/O and cannot reconstruct authority from a persisted job.