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89 lines
2.9 KiB
Markdown
89 lines
2.9 KiB
Markdown
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---
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title: Register All Sub-Agents in Both `agents` and `listeners.agents`
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impact: CRITICAL
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impactDescription: An agent registered only in `agents` but not referenced in a listener's agent list is unreachable; an agent listed in a listener but missing from `agents` causes a startup error
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tags: agent, orchestration, config, multi-agent
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---
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## Register All Sub-Agents in Both `agents` and `listeners.agents`
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Plano's agent system has two separate concepts: the global `agents` array (defines the agent's ID and backend URL) and the `listeners[].agents` array (controls which agents are available to an orchestrator and provides their routing descriptions). Both must reference the same agent ID.
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**Incorrect (agent defined globally but not referenced in listener):**
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```yaml
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version: v0.3.0
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agents:
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- id: weather_agent
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url: http://host.docker.internal:8001
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- id: news_agent # Defined but never referenced in any listener
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url: http://host.docker.internal:8002
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listeners:
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- type: agent
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name: orchestrator
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port: 8000
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router: plano_orchestrator_v1
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agents:
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- id: weather_agent
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description: Provides weather forecasts and current conditions.
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# news_agent is missing here — the orchestrator cannot route to it
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```
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**Incorrect (listener references an agent ID not in the global agents list):**
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```yaml
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agents:
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- id: weather_agent
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url: http://host.docker.internal:8001
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listeners:
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- type: agent
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name: orchestrator
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port: 8000
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router: plano_orchestrator_v1
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agents:
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- id: weather_agent
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description: Provides weather forecasts.
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- id: flights_agent # ID not in global agents[] — startup error
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description: Provides flight status information.
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```
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**Correct (every agent ID appears in both places):**
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```yaml
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version: v0.3.0
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agents:
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- id: weather_agent
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url: http://host.docker.internal:8001
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- id: flights_agent
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url: http://host.docker.internal:8002
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- id: hotels_agent
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url: http://host.docker.internal:8003
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model_providers:
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- model: openai/gpt-4o
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access_key: $OPENAI_API_KEY
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default: true
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listeners:
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- type: agent
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name: travel_orchestrator
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port: 8000
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router: plano_orchestrator_v1
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agents:
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- id: weather_agent
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description: Real-time weather, forecasts, and climate data for any city.
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- id: flights_agent
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description: Live flight status, schedules, gates, and delays.
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- id: hotels_agent
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description: Hotel search, availability, pricing, and booking.
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default: true # Fallback if no other agent matches
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```
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Set `default: true` on one agent in each listener's agents list to handle unmatched requests. The agent's URL in the global `agents` array is the HTTP endpoint Plano forwards matching requests to — it must be reachable from within the Docker container (use `host.docker.internal` for services on the host).
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Reference: https://github.com/katanemo/archgw
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