Your AI coding agents, at full speed.
IXEL Harness is a terminal and web workspace that drives Claude Code and Codex across all of your accounts, with one shared tool set and everything you need to let agents do real work safely.
Built for long, real-world agent work.
Every model, one tool set
Drive the official Claude Code and Codex CLIs with the same tools, so switching models never means relearning your workflow.
All your accounts
Use several subscription accounts side by side. IXEL Harness balances work across them and fails over when one hits a limit.
Routing
Send each task to the right model automatically, or pick one yourself.
Goals and plans
Give the agent a goal and let it keep working until it is done, or review and approve a plan before it starts.
Subagents
Spread work across parallel agents, each in its own isolated copy of your repository, and merge the results.
Rewind
Step back to any earlier point in a conversation, with your files restored to match.
Permissions and sandbox
Approve what the agent does, set rules for what it may do on its own, and run commands in a sandbox.
Terminal, web and headless
Work in a fast terminal UI, in the browser, or script it in CI with a single command.
MCP, hooks and skills
Bring your MCP servers, Claude Code-compatible hooks and skills, and extend it from a marketplace.
Install it in one line.
IXEL Harness runs on macOS, Linux and Windows with Node.js 22 or newer and uses your existing Claude Code and Codex sign-ins. It is published as rein-harness while it moves to the IXEL name.
npm install -g rein-harness rein
Accelerate what AI can do for you.
We're building IXEL now. Leave your email and we'll tell you when Mesh, Remote and Compute open up.