Hermes on MiMo-V2.5: a 1M-context agent for pennies

The Stack

Steps

1. 1

   Point Hermes at MiMo-V2.5 and validate the config

   Write ~/.hermes/config.yaml so model.provider is openrouter and model.model is the xiaomi/mimo-v2.5 slug. MiMo is not on Hermes' tool-use auto-enforce list (gpt/codex/gemini/gemma/grok), so turn tool_use_enforcement on if it narrates instead of calling tools. CI loads this exact YAML with a real parser and asserts the slug, no key.

   cat > config.yaml <<'YAML'
   model:
     provider: openrouter
     model: xiaomi/mimo-v2.5
   agent:
     tool_use_enforcement: true
   YAML
   ruby -ryaml -e '
   c = YAML.load_file("config.yaml")
   m = c["model"] || {}
   abort "BAD: provider not openrouter" unless m["provider"] == "openrouter"
   abort "BAD: model not xiaomi/mimo-v2.5" unless m["model"] == "xiaomi/mimo-v2.5"
   puts "config OK: openrouter -> xiaomi/mimo-v2.5 (config.yaml parses)"
   '

2. 2

   Run the agent (the model step, not checked by CI)

   Set OPENROUTER_API_KEY in ~/.hermes/.env and start Hermes. The conversation itself runs MiMo and costs per-token, so CI never claims it.