Context Bridge is an open-source CLI agent harness and context orchestration utility developed by serdardb. It is built to facilitate seamless context switching and conversation state portability across different terminal-based AI coding agents. Operating as a lightweight Node.js command-line tool, Context Bridge manages session transitions between supported developer agents, including Claude, OpenAI Codex, and OpenCode. It tracks active session threads, captures transcript deltas, and delivers state updates across agent boundaries using runtime hooks like SessionStart. What sets Context Bridge apart is its multi-route adopt architecture. Instead of locking developers into a single proprietary assistant interface, it allows users to switch between disparate AI tools on the fly, auto-adopting external sessions via process environment indicators such as CODEX_THREAD_ID or working directory rollout discovery. The project is available as an open-source tool with zero external runtime dependencies, supporting Node.js environments (v18, v20, and v22).
Tags: agent harness, ai agent, cli, coding agent, developer tools, OpenSource