hermes-config-yaml

Hermes reports unknown providers because hermes config set can mangle nested YAML structures, converting custom_providers lists into broken index-style keys like custom_providers[1]. Directly patching the config.yaml file preserves the valid list syntax and fixes the provider resolution errors.

To safely edit custom_providers in a Hermes config.yaml file, apply direct patch-style edits to preserve the nested YAML list and mapping structure. This prevents destructive command outputs from corrupting complex provider entries with multiple model backends and API keys.

The best way to fix malformed YAML updates in a Hermes configuration is to bypass destructive commands and rewrite the nested custom_providers structure directly. This ensures the standard list syntax is preserved for safe validation and gateway restart.

Yes, you need to validate Hermes config.yaml after patching custom_providers entries to ensure syntax correctness. Running Hermes diagnostics and restarting the gateway confirms the YAML is properly structured and prevents unknown provider errors.

Using standard config commands for complex provider aliases in Hermes is not recommended because they can destructively overwrite nested YAML. Direct file patching is required to maintain multiple model backends, API keys, and provider flags without breaking the config.