harnss

About

harnss is a desktop application for running several AI coding agents side by side without losing context between them. It embeds Claude Code through the Anthropic Agent SDK, Codex through its JSON-RPC app-server, and any Agent Client Protocol-compatible agent such as Gemini CLI, Goose, or Docker cagent, keeping each session's state independent while allowing instant switching. The interface renders tool calls in detail — word-level diffs, syntax-highlighted code, inline command output, nested subagent trees — and layers on MCP server management per project, git operations with AI-generated commit messages, built-in terminal tabs, and a browser panel. Permission handling offers three levels from ask-first to full autonomy, with plan mode and background task agents for longer work. The project is early-stage and open about a pending rewrite, distributing unsigned binaries for macOS, Windows, and Linux.