Comment by CyberShadow

If you invoke Claude Code with --input-format stream-json --output-format stream-json, you can use it headlessly. I built a personal UI / orchestration framework around it. Most features are available, but not exactly all (e.g. there is no way to undo via this protocol, but you can still do it manually by terminating / editing the session file / resuming). Other agentic software has similar features (Codex uses JSON-RPC, Copilot CLI has ACP which is also based on JSON-RPC).