llm-router

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The llm-router plugin handles LLM API requests with provider resolution, model mapping, retries, and circuit breaker.

Overview

Phase: Access
Purpose: Route LLM requests to configured providers
Behavior: Normalizes requests, resolves models, handles retries

Configuration

{
  "pluginName": "llm-router",
  "config": {
    "clientProfile": "auto",
    "requestTimeoutMs": 60000,
    "maxRetries": 2,
    "retryOnStatus": [429, 500, 502, 503],
    "circuitBreaker": {
      "failureThreshold": 5,
      "successThreshold": 3,
      "openTimeoutMs": 30000,
      "minimumRequests": 10,
      "errorRateThreshold": 0.5
    },
    "logging": {
      "enabled": true,
      "storeBodies": false
    }
  }
}

Option	Type	Default	Description
`clientProfile`	string	`auto`	Client type: auto, openai, claude
`requestTimeoutMs`	number	`60000`	Request timeout (ms)
`maxRetries`	number	`0`	Additional retry attempts
`retryOnStatus`	number[]	`[429,500,502,503]`	Status codes to retry
`circuitBreaker`	object	See below	Circuit breaker settings
`logging`	object	See below	Request logging settings

Client Profiles

Circuit Breaker

Prevent cascading failures by temporarily blocking failing providers:

{
  "circuitBreaker": {
    "failureThreshold": 5, // Failures to open circuit
    "successThreshold": 3, // Successes to close circuit
    "openTimeoutMs": 30000, // Time before retry (half-open)
    "minimumRequests": 10, // Min requests before error rate
    "errorRateThreshold": 0.5 // Error rate to open circuit
  }
}

Retry Configuration

Retry on specific status codes:

{
  "maxRetries": 2,
  "retryOnStatus": [429, 500, 502, 503]
}

Request Logging

Track all LLM requests:

{
  "logging": {
    "enabled": true,
    "storeBodies": false
  }
}

Option	Description
`enabled`	Persist attempt logs to database
`storeBodies`	Store request and response bodies

Model Reference Format

Requests use provider/model format:

provider-name/model-name

Examples:

openai/gpt-4 → OpenAI provider, gpt-4 model
anthropic/claude-3-opus → Anthropic provider, claude-3-opus model

Setup Example

Provider Authentication

Configure provider auth in LLM Provider entity:

Request Timeout

Set timeout for upstream LLM requests:

{
  "requestTimeoutMs": 120000 // 2 minutes
}

LLM requests can be slow. Set appropriate timeout.

Error Responses

Provider Not Found (400)

{
  "error": "Bad Request",
  "message": "Unknown LLM provider \"unknown-provider\""
}

Model Not Found (400)

{
  "error": "Bad Request",
  "message": "Unknown LLM model \"unknown-model\" for provider \"openai\""
}

Provider Disabled (503)

{
  "error": "Provider Unavailable",
  "message": "LLM provider \"openai\" is disabled"
}

Circuit Open (503)

{
  "error": "Provider Unavailable",
  "message": "LLM provider \"openai\" circuit is open"
}