Open-source, desktop client/UI build to harness Claude Code, Codex and any other Agent accepting Agent Client Protocol. Run multiple AI coding agents side by side with rich tool visualization, MCP integrations, built-in terminal, git, browser and just about anything else you may need.
Latest release v0.21.5 — 0.21.5 · 19 Mar 2026
11 files for Claude Code, Codex and OpenCode: release, vercel-react-best-practices, clean-code-refactor, code-quality-reviewer and 7 more — 16,927 tokens loaded in every session.
AGENTS.md A 4 tok CLAUDE.md A 16,923 tok .agents/skills/release/SKILL.md A 54 tok .agents/skills/vercel-react-best-practices/SKILL.md A 67 tok .claude/agents/clean-code-refactor.md A 369 tok .claude/agents/code-quality-reviewer.md A 328 tok .claude/agents/docs-researcher.md A 366 tok .claude/agents/perf-deep-audit.md A 299 tok .claude/agents/refactor-analyst.md A 437 tok .claude/agents/refactor-validator.md A 398 tok .claude/agents/typescript-type-reviewer.md A 324 tok These files are OpenSource03/harnss's own configuration — they tell Claude Code, Codex and OpenCode how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.