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Before you begin

Install Hermes Agent CLI, create a key on the API Keys page, and choose a model on the Models page.
1

Set your API key

Add your key to ~/.hermes/.env:
~/.hermes/.env
2

Configure LithosAI

The configuration uses deepseek-ai/DeepSeek-V4.1-Flash as an example.Merge into ~/.hermes/config.yaml, keeping existing providers. Set context_length to match your model, with a minimum of 64,000 tokens.
~/.hermes/config.yaml
To add another model or tier, copy the entry under providers.lithosai.models. Use its ID from the model catalog as the new key, and set context_length to match the model. Reopen Hermes to load the changes.
3

Start a conversation

Run hermes to start a conversation.

Model and reasoning effort

  • Model and tier: Use /model to switch in the current conversation.
  • Reasoning effort: Use /reasoning to select low, high, or max. The default is high.
Issues common to every agent are listed under Common issues.

Resources