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When using OpenRouter ↗ or Nous Portal as your LLM provider, Hermes Agent supports provider routing — fine-grained control over which underlying AI providers handle your requests and how they're prioritized.

OpenRouter routes requests to many providers (e.g., Anthropic, Google, AWS Bedrock, Together AI). Provider routing lets you optimize for cost, speed, quality, or enforce specific provider requirements.

Add a provider_routing section to your ~/.hermes/config.yaml:

provider_routing:
  sort: "price"           # How to rank providers
  only: []                # Whitelist: only use these providers
  ignore: []              # Blacklist: never use these providers
  order: []               # Explicit provider priority order
  require_parameters: false  # Only use providers that support all parameters
  data_collection: null   # Control data collection ("allow" or "deny")

sort

Controls how OpenRouter ranks available providers for your request.

provider_routing:
  sort: "price"

only

Whitelist of provider slugs. When set, only these providers will be used. All others are excluded. Use the lowercase slug shown by OpenRouter for each provider.

provider_routing:
  only:
    - "anthropic"
    - "google"

ignore

Blacklist of provider names. These providers will never be used, even if they offer the cheapest or fastest option.

provider_routing:
  ignore:
    - "together"
    - "deepinfra"

order

Explicit priority order. Providers listed first are preferred. Unlisted providers are used as fallbacks.

provider_routing:
  order:
    - "anthropic"
    - "google"
    - "amazon-bedrock"

requireparameters

When true, OpenRouter will only route to providers that support all parameters in your request (like temperature, top_p, tools, etc.). This avoids silent parameter drops.

provider_routing:
  require_parameters: true

datacollection

Controls whether providers can use your prompts for training. Options are "allow" or "deny".

provider_routing:
  data_collection: "deny"

Optimize for Cost

Route to the cheapest available provider. Good for high-volume usage and development:

provider_routing:
  sort: "price"

Optimize for Speed

Prioritize low-latency providers for interactive use:

provider_routing:
  sort: "latency"

Optimize for Throughput

Best for long-form generation where tokens-per-second matters:

provider_routing:
  sort: "throughput"

Lock to Specific Providers

Ensure all requests go through a specific provider for consistency:

provider_routing:
  only:
    - "anthropic"

Avoid Specific Providers

Exclude providers you don't want to use (e.g., for data privacy):

provider_routing:
  ignore:
    - "together"
    - "lepton"
  data_collection: "deny"

Preferred Order with Fallbacks

Try your preferred providers first, fall back to others if unavailable:

provider_routing:
  order:
    - "anthropic"
    - "google"
  require_parameters: true

Provider routing preferences are passed to OpenRouter or Nous Portal on agent chat requests and iteration-limit summaries via the extra_body.provider field. (extra_body is the OpenAI Python SDK argument; it becomes the top-level provider object in the JSON request.) Auxiliary tasks such as compression and title generation are configured independently under auxiliary.<task>.extra_body.

• CLI mode — configured in ~/.hermes/config.yaml, loaded at startup
• Gateway mode — same config file, loaded when the gateway starts

The routing config is read from config.yaml and passed as parameters when creating the AIAgent:

providers_allowed  ← from provider_routing.only
providers_ignored  ← from provider_routing.ignore
providers_order    ← from provider_routing.order
provider_sort      ← from provider_routing.sort
provider_require_parameters ← from provider_routing.require_parameters
provider_data_collection    ← from provider_routing.data_collection

When no provider_routing section is configured (the default), the aggregator uses its own default routing logic, which generally balances cost and availability automatically.