Struct SubprocessProcessSpawnerFactory 

pub struct SubprocessProcessSpawnerFactory;

Factory for AgentKind::Subprocess. Turns the spec into a ProcessSpawner.

Naming convention: <WorkerIMPL><AdapterType>SpawnerFactory. Factory names carry both the worker implementation and the host adapter so they are not confused with each other; the old ShellSpawnerFactory was renamed to this.

Spec shape:

{ "program": "agent-block", "args": ["-s","s.lua"],
  "use_stdin": true,                       // optional, default = true
  "stream_mode": "ndjson_lines" | "sse_events" | "length_prefixed" | null  // optional, default = null (plain)
}

GH #83 — EmbedAgent template mode

When the build hint carries a subprocess_template key (synthesized by Compiler::compile from a resolved Runner::Subprocess — see [resolve_subprocess_template_hint]), the factory switches to the EmbedAgent path instead: it bakes agent_def.profile (system_prompt / model / tools, same compile-time bake shape as OperatorSpawnerFactory), validates the template’s placeholder tokens against the closed set, and returns a ProcessSpawner whose embed field drives the render → exec → normalize spawn. The spec-based shape above stays byte-for-byte untouched when no such hint is present.

Trait Implementations

impl SpawnerFactory for SubprocessProcessSpawnerFactory

fn build( &self, agent_def: &AgentDef, hint: Option<&Value>, ) -> Result<Arc<dyn SpawnerAdapter>, CompileError>

Build the concrete SpawnerAdapter for one AgentDef. hint is the matching entry (if any) from Blueprint.hints.per_agent.

impl SpawnerFactoryKind for SubprocessProcessSpawnerFactory

const KIND: AgentKind = AgentKind::Subprocess

The AgentKind this factory handles — used as the HashMap key by SpawnerRegistry::register.

type Worker = ProcessWorker

The concrete Worker type produced by this AgentKind — this binds the type chain all the way from AgentKind down to Worker. Every factory declares it so the AgentKind → Worker mapping is explicit across all four layers. It is the source of truth for preserving the concrete type right up until SpawnerAdapter::spawn erases it into Box<dyn Worker>.