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The Plugin adds Helix to a coding agent you already have. It installs through the mutagent CLI, which pulls the Helix skills into your editor.
Before you start: a working Claude Code or Codex, and Node (for the CLI). The Plugin upgrades a coding agent you already have — it doesn’t give you one.
1

Install the CLI

See CLI installation for pnpm / bun and details.
2

Sign in

Opens a browser to authorize the CLI. Set MUTAGENT_API_KEY to skip the browser in CI.
3

Install Helix

Installs the Helix orchestrator and the lifecycle skills into your coding agent’s .claude/, and links CLAUDE.md / AGENTS.md so the agent boots the orchestrator. Add other skills the same way — for example mutagent install diagnostics.
4

Open your coding agent

Helix runs inside the coding agent you installed it into — Claude Code or Codex. Open it in your project directory. (Helix isn’t a shell command; the next step is typed into the agent, not your terminal.)
5

Boot the orchestrator

In the agent, invoke the Helix skill:
Typing *mutagent works too. From there you drive Helix in plain English.
Nothing happened? Boot-on-load is a request to the host agent, not a guarantee. Type boot the orchestrator to force it.

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Update

Re-run mutagent install helix to refresh the orchestrator and skills.

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Remove it

Delete the skill directories the install wrote under .claude/, then remove the Helix section from your CLAUDE.md / AGENTS.md.

Next: your first loop

Run a spec → build → evaluate pass end to end.