Agents and harnesses

Choose which agent CLI runs a task, and give it what it needs to run headless.

Added in 2.1

Each guide takes one task from start to finish.

In this section

Switch a task to another harness: run agent tasks on Codex or another CLI instead of Claude Code.
Add or override a harness: add an agent CLI with a YAML file.
Build a worker Kit: build a Docker Sandbox Kit for Claude workers and run a repository's sandbox from it.
Give a worker its login: give the agent CLI a worker runs on a login it can use headless, and check that it works.

Publish an add-on

Lay out a collection, write an add-on's chains and skills, validate it, and publish it for other instances to install.

Switch a task to another harness

Run some or all of a chain's agent tasks on Codex, Cursor, OpenCode, Gemini, Antigravity or Amp instead of Claude Code, and what changes when you do.