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How to add Ponytail rules to any coding agent with Ponytail

Copy the compact AGENTS.md rules file into a project so a non-Claude agent follows them.

Who it is forA developer using an agent other than Claude Code or Codex who wants the same lean coding rules.

The problemEach agent reads project rules differently, and most agents have no plugin to install.

The outcomeA project where the agent reads the Ponytail rules on every session, without the review or audit commands.

What you need first

  • Claude Code or Codex installed
  • A git repository with a project to work on
  • Permission to install a plugin into your agent

Steps

  1. Open the Ponytail repo at https://github.com/DietrichGebert/ponytail.
  2. Copy AGENTS.md into the root of your project.
  3. Start a new session with your agent in that project.
  4. Check the agent's first reply for the rules taking effect.
  5. Read INSTALL.md in the repo if your agent needs a different install path.

Prompt for your agent

Copy AGENTS.md from DietrichGebert/ponytail into the root of <project-path>, then start a session and ask the agent to add a small helper function. Expected output: a short helper that follows the Ponytail rules. Verify that the agent did not add extra abstraction or unused code.

Caveat. Without a skill-capable host, the README says the commands are not available, so you only get the always-on rules.

Use this in your AI agent

Ask your agent

Using the Deduped MCP, get the setup steps for DietrichGebert/ponytail and "Add Ponytail rules to any coding agent"

Add Deduped to Claude Code once

claude mcp add --transport http deduped https://dedupedai.com/mcp

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