Overview / Description
Fixy Code is a multi-agent terminal tool that orchestrates Claude Code, Codex, and Gemini inside a single persistent terminal thread for software developers. Instead of switching between AI coding assistants manually, developers install one npm package and can invoke all three agents simultaneously or individually using @mention syntax. When using the /all command, agents hold up to five discussion rounds to agree on an approach before writing any code — then work in parallel, each in its own isolated git worktree to avoid merge conflicts. Red Room Mode takes this further with adversarial testing: one agent writes code while another deliberately hunts for bugs, edge cases, and security vulnerabilities before anything is committed. Fixy Code runs entirely locally — it never stores source code or intercepts API calls. It uses the Claude Code, Codex CLI, and Gemini CLI subscriptions already installed on a developer's machine; no new AI API keys are required. Worker Mode lets developers set a default agent per project so routine questions go directly there without typing @mentions every time. Sessions are persistent across restarts via fixy --thread, and multiple sessions can run concurrently. The tool is open source under the MIT license and available on GitHub. It is particularly suited to code review workflows, security auditing, and complex refactoring tasks where getting a second or third AI opinion before committing changes reduces risk.
Used For
Multi-agent code review, adversarial security auditing of code before commit, coordinating Claude Code and Codex on the same codebase, parallel AI-assisted refactoring with worktree isolation, running group AI planning sessions before implementation, switching between AI coding agents per project with Worker Mode, persistent multi-session terminal-based development, open-source developer tooling, automated bug and edge-case discovery via Red Room Mode
Pricing
Pros & Cons
Pros
- Runs Claude Code, Codex, and Gemini together in one terminal thread using a single npm install command, with no new API keys required
- Red Room Mode enables adversarial code review where one agent attacks another's output for bugs, edge cases, and security issues before committing
- Worktree Isolation gives each agent its own git worktree, eliminating merge conflicts and allowing independent review of each agent's changes
- Multi-agent /all discussions run up to 5 planning rounds before writing code, reducing the chance of agents diverging mid-implementation
- MIT-licensed open source project — code is publicly auditable and forkable on GitHub
Cons
- Requires at least one of Claude Code, Codex CLI, or Gemini CLI to already be installed and authenticated separately — Fixy does not supply models
- Free tier limits users to 3 active threads and 1 project, which may be restrictive for teams or developers working across multiple repos
- Background automations are only available on paid plans (Pro and above)
- Team collaboration features such as shared workspaces and audit logs require the Team plan at $20/month or higher
Alternatives
Aider, Cursor, GitHub Copilot, Cline, Continue