Ralph Orchestrator is an open-source, Rust-based harness created by Mikey O'Brien that implements the Ralph Wiggum technique for autonomous AI agent execution. Instead of terminating after a single response, Ralph executes underlying AI agents inside continuous feedback loops, repeating cycles until tasks meet validation criteria or emit a completion signal. In daily development, users operate Ralph through the CLI, an alpha web UI, or an MCP server interface. Workflows can start with prompt-driven development (PDD) planning to generate requirements, design specifications, and implementation steps in the `.ralph/specs/` directory. Ralph then drives tasks across multiple CLI backends—including Claude Code, Kiro, Gemini CLI, Codex, Copilot CLI, and OpenCode—managing state and context between iterations. What differentiates Ralph from standard single-agent runners is its hat-based architecture and backpressure enforcement. Hats act as specialized personas that coordinate through event emission, while backpressure gates automatically execute tests, linter passes, and typechecks to reject incomplete or broken agent outputs. It also includes RObot, an optional Telegram integration for human-in-the-loop blocking questions and mid-flight steering. Ralph Orchestrator is free, open-source software released under the MIT license. It is distributed via npm, Cargo, and pre-built shell installers.
Tags: agent harness, ai agent, cli, coding agent, OpenSource