Codex Engine

The Codex engine integrates OpenAI's Codex via a JSON-RPC child process. It provides an alternative agent experience with full MCP tool access.

Requirements

Requires the Codex CLI installed and authenticated. Conduit detects availability and shows status in the engine selector.

Communication

Uses JSON-RPC over stdin/stdout with a child process (App Server mode). Messages are exchanged in structured format for reliable tool call handling.

Features

• Full access to MCP tools
• Rich message blocks similar to Claude Code
• Approval flow for operations
• Session persistence across restarts

Edit & Retry

Edit user messages or regenerate responses. Codex uses thread/rollback to preserve context before the edit point, maintaining conversation coherence.

Session Management

Sessions persist in SQLite. Browse and resume past sessions from the history panel. Read-only mode for expired sessions.