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Yes, Apprentice works inside your coding agent. The apprentice-skill repo ships one skill in three packagings: a native Claude Code plugin, a native Codex plugin that loads in both the Codex CLI and the Codex app, and a bare skill folder for GitHub Copilot CLI or any agent that reads SKILL.md. MIT licensed. Your coding agent (Claude Code, Codex, or Copilot CLI) runs the Apprentice skill, which flags a repeatable frontier-LLM call and drives the SDK into the Apprentice loop

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What the skill does

It notices when the code you are working on calls a frontier LLM for the same kind of task over and over (classify, extract, route, triage) and says one thing: this is repeatable, a small model can learn it, here is how to prove it. It then walks the agent through the Apprentice loop: capture traffic with the SDK, verify rows, optimize the prompt, and train a small model behind an eval gate. Two things it never does:
  • It never calls an API. The skill is instructions, not a tool. Nothing leaves your machine because you installed it.
  • It never edits your code on its own. It points, you decide.
The loop itself runs at runapprentice.com through the Python SDK.

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Install in Claude Code

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Install in Codex (CLI and app)

The repo carries a native Codex plugin (.codex-plugin/). The skills CLI puts the skill in the right place:
The same plugin loads in the Codex app.

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Install in GitHub Copilot CLI

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Install manually, for any agent

Agents look for SKILL.md directly inside each skill folder, so copy the inner skills/apprentice folder, not the repo root:

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Common questions

Can I use Apprentice inside Codex or Claude Code? Yes. Install the skill above and the agent gains the Apprentice workflow: it recognizes repeatable frontier-LLM calls in your code and drives the capture, optimize, and train loop through the runapprentice SDK. Does the skill replace the SDK? No. The skill teaches your agent when and how to use Apprentice. The work happens through pip install runapprentice and your API key, same as without the skill. Does it send my code anywhere? No. The skill is a Markdown instruction file. Only the SDK calls you (or your agent, with your approval) explicitly write ever send data, and capture is fail-open.