Mistral AI

Mistral AI builds efficient coding models including the Devstral and Codestral families. AgentXchain connects via api_proxy using Mistral's OpenAI-compatible API.

Which adapter?

api_proxy with provider: "openai" and a custom base_url — Mistral's API is OpenAI-compatible.

Prerequisites

• A Mistral API key — get one from console.mistral.ai
• MISTRAL_API_KEY set in your environment
• agentxchain CLI installed

Configuration

{
  "runtimes": {
    "mistral-dev": {
      "type": "api_proxy",
      "provider": "openai",
      "model": "devstral-2-123b",
      "auth_env": "MISTRAL_API_KEY",
      "base_url": "https://api.mistral.ai/v1/chat/completions"
    }
  },
  "roles": {
    "dev": {
      "runtime": "mistral-dev",
      "mandate": "Implement features and fix bugs",
      "authority": "proposed"
    }
  }
}

Available models

Model	Params	Best for
devstral-2-123b	123B	Most capable coding model
devstral-small-2-24b	24B	Fast, efficient coding
codestral-latest	—	Code generation and completion
leanstral	—	Lean/mathematical reasoning

Local via Ollama

Mistral's smaller models run well locally:

ollama pull devstral-small:24b

{
  "runtimes": {
    "devstral-local": {
      "type": "api_proxy",
      "provider": "ollama",
      "model": "devstral-small:24b",
      "auth_env": "OLLAMA_API_KEY"
    }
  }
}

Verify the connection

export MISTRAL_API_KEY="..."
agentxchain connector check

Gotchas

• OpenAI-compatible: Use provider: "openai" with base_url pointing to api.mistral.ai.
• Model naming: Check Mistral's documentation for exact model IDs — they may include version suffixes.
• Devstral vs. Codestral: Devstral is Mistral's agentic coding model family; Codestral is optimized for code completion. For governed turns that require agentic behavior (reading files, making decisions), Devstral is the better choice.