Tianyi Cui
9a4006cb2b
Add the agent-creation factory seam on ctx.agents (AgentRegistry):
setFactory/create/resume plus the AgentFactory interface and
CreateAgentOptions/ResumeAgentOptions. AgentLoop implements AgentFactory
and registers itself via ctx.agents.setFactory(this), so plugins
create/resume agents through the interface without depending on the
concrete loop package.
- create({ agentId, sessionId, meta?, agentOptions? }) — programmatic
create on a caller-supplied session id (e.g. an ACP-generated id).
- resume({ agentId, resumeSessionId, agentOptions? }) — load a persisted
session via ctx.sessionPersistence (RFC 009) and resume an agent on it;
the live session id is the resumed id, turn numbering and derived
history continue from the loaded log. sessionPersistence is NOT
hard-injected (non-persistent demos still work); resume rejects with a
typed error when it is absent. assertAgentIdFree runs before any
session is created (and again after the load await) so a duplicate id
never leaves an orphaned live session.
Adds the runtime dsh-session-persistence dependency to agent-loop.
78 lines
3.7 KiB
Markdown
78 lines
3.7 KiB
Markdown
# dsh-agent-loop
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THE concrete agent plugin: `LoopAgent` and the loop driver. Implements the `Agent` interface and drives the session/turn/step lifecycle.
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This is the only package in the harness that contains concrete loop logic. Everything else is an abstract service or a plugin against extension seams — new behavior goes into plugins, not here.
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## Service: `AgentLoop` (ctx key: `agentLoop`)
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### Public API
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- `ctx.agentLoop.create(id: string, options?: AgentOptions): LoopAgent` — config-driven create: an agent on a fresh per-run session id `${id}-session-<uuid>` (no cwd). Used for `cordis.yml`-configured agents. The per-run uuid avoids colliding with the on-disk log a prior run materialized once a durable persistence backend is loaded; each run is a new session (a deliberate demo simplification — a real resume-or-create policy is a TODO). Disposed with the calling fiber.
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`AgentLoop` also implements the `AgentFactory` seam and registers itself via `ctx.agents.setFactory(this)`, so plugins create/resume agents through `ctx.agents` (the interface):
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- `ctx.agents.create({ agentId, sessionId, meta?, agentOptions? })` — programmatic create on a caller-supplied `sessionId` (e.g. an ACP-generated id), NOT `${id}-session`.
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- `ctx.agents.resume({ agentId, resumeSessionId, agentOptions? })` — load a persisted session via `ctx.sessionPersistence` (RFC 009) and resume an agent on it. The live session id is the resumed id; turn numbering and derived history continue from the loaded log. Requires a session-persistence backend (NOT hard-injected — non-persistent demos still work; `resume` rejects with a typed error when persistence is absent).
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### Injected services
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`agents`, `sessions`, `llm`, `tools`, `systemPrompt` — all five interface services.
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### Configuration (schemastery)
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```ts
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interface Config {
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agents: Array<{
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id: string // required
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model?: string
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systemPrompt?: string
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}>
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}
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```
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Agents listed in config are auto-created at startup.
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### Classes
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- `LoopAgent` — the concrete `Agent` implementation. Owns the inbox (`Inbox`), the per-step `AbortController`, and the loop driver. Everything observable happens through session events and the `agent/*` event taxonomy.
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- `Inbox` — per-agent queued + steering FIFOs (`enqueue`, `steer`, `drainQueued`, `drainSteering`, `waitForQueued`).
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### Loop lifecycle (`loop.ts`)
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One invocation of `runLoop()` drives one agent for its whole lifetime:
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```
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forever:
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wait for queued messages (idle)
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TURN (error-contained):
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drain queued → 'turn/start' → session('user/message')
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STEP loop:
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drain steering
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assembly = systemPrompt.assemble()
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request = waterfall agent/request
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stream llm.stream(request) → session('assistant/chunk')
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message = waterfall agent/step-result
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session('assistant/message')
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each tool-call: session('tool/call') → tools.execute() → session('tool/result')
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drain steering → session('steering/message')
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cont = waterfall agent/turn-continuation
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if !cont: break
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session('turn/end')
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await session/flush
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re-enqueue leftover steering as queued
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idle unless more queued
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```
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Error containment: a throwing plugin ends the **turn**, never the loop. Dispose mid-turn emits `agent/status('disposed')` and ends with reason `disposed`.
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### What is NOT here
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Everything that goes beyond "call the model, run the tools, repeat" belongs to plugins listening on the event taxonomy:
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- Hooks: `agent/request`, `agent/step-result`, `tools/execute`, `agent/turn-continuation`
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- Compaction: `agent/request`
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- Sandbox, permission, plan mode: `tools/execute`
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- Sub-agents: TODO seam on `AgentLoop.create()`
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- Persistence: `session/event` + `session/flush`
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- UI: `agent/stream-chunk` + `agent/*` events
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