Ponytail is an always-on ruleset and plugin for AI coding agents (Claude, Codex, Gemini, Copilot, etc.) that enforces a step-by-step “ladder” to include only necessary code. Benchmarks show 80–94% less code, 3–6× faster responses, and 42–75% lower cost by preferring built-ins and one-liner solutions before adding dependencies.

• Ponytail cuts AI-generated code by 80–94% while running 3–6× faster and costing 42–75% less, per Claude API benchmarks across Haiku, Sonnet, and Opus.
• It enforces a strict ladder—skip via YAGNI, use stdlib/native features, add dependencies only if essential, then compress to one-liners—without trimming validation, error handling, security, or accessibility.
• It installs as a plugin (e.g. via Claude Code or Codex commands) and works across Copilot CLI, OpenCode, Gemini/Antigravity, Cursor, Windsurf, Cline, and other agent hosts by copying matching rule files into each tool's config.
• Modes range from lite to full to ultra, adjustable via slash commands or an environment variable, giving control over how aggressively code gets minimized.

Ponytail is a plugin and ruleset for AI coding agents that enforces a six-step minimal-code ladder—skip unnecessary code, prefer stdlib or native features, then one-liners—to produce only what each task needs. Benchmarks on Claude models show 80–94% less code, 3–6× faster runs, and 42–75% lower cost. Installation covers Claude Code, Codex, OpenCode, Gemini/Antigravity CLI, Copilot, ClawHub, and more.

• Ponytail enforces a six-step "minimal code" decision ladder before an AI agent writes anything, starting with "does this need to exist" and falling back to stdlib/native features before custom code.
• Benchmarks on five tasks (run 30x for cost, 10x for code/latency) show 80–94% less code, 3–6x faster responses, and 42–75% lower cost versus a vanilla agent.
• It tags every shortcut with a "ponytail" comment for traceability, and preserves validation, error handling, security, and accessibility rather than golfing code.
• Installation is two small Node.js hooks across Claude Code, Codex, Copilot, Gemini/Antigravity, and others, adding slash commands (/ponytail lite|full|ultra|off, /ponytail-review, /ponytail-audit, /ponytail-debt) to control and audit the shortcuts.