Mnemosyne + OpenAI Codex CLI

Connect Codex CLI to Mnemosyne for long-term memory across coding sessions.

Setup

1. Install Mnemosyne with MCP support:

pip install "mnemosyne-memory[mcp]"

2. Add to .codex/mcp.json in your project root:

{
  "mcpServers": {
    "mnemosyne": {
      "command": "mnemosyne",
      "args": ["mcp"],
      "env": {}
    }
  }
}

3. Restart Codex CLI. Tools appear automatically.

Usage

Ask Codex:

• "Remember my preferred test framework is pytest"
• "Recall our discussion about migration strategy"
• "What preferences do you have stored for me?"

Memory Banks

Codex projects can use separate memory banks to keep context isolated per project:

{
  "mcpServers": {
    "mnemosyne": {
      "command": "mnemosyne",
      "args": ["mcp", "--bank", "codex-{{project-name}}"],
      "env": {}
    }
  }
}