Open-source ruleset plugin that makes AI coding agents write the least code that works, cutting diffs and token spend without losing safety.

Ponytail works by combining The Decision Ladder: Forces the agent through six escalating checks — skip it, reuse existing code, use the standard library, use a native platform feature, use an installed dependency, write one line — before it is allowed to write new code., Three Intensity Levels: 'lite' builds what you asked and names the lazier alternative for you to choose, 'full' enforces the ladder with the shortest diff and explanation, and 'ultra' ships the one-liner and challenges the requirement itself., Over-Engineering Review Command: /ponytail-review scans the current diff and points out code that could have been avoided or collapsed., Whole-Repo Bloat Audit: /ponytail-audit scans an entire repository for accumulated over-engineering rather than only the working diff., Technical Debt Ledger: /ponytail-debt collects the shortcuts the agent deliberately deferred into one tracked list so nothing is silently lost. to help users with Controlling Agent Code Bloat: Stop a coding agent from generating a fifty-line class where a standard-library one-liner has the same behavior and none of the maintenance cost., Lowering Token and API Spend: Cut the cost of agent-driven development by reducing how much code the model writes and re-reads on each task., Reviewing an Agent-Written Diff: Run a targeted over-engineering pass on a pull request before merging code an agent produced., Auditing an Existing Codebase: Scan a repository that has accumulated agent-generated code to find abstractions and helpers that duplicate what already exists., Enforcing Reuse Over Reinvention: Push an agent to find and use the helper, util or pattern already living in the codebase instead of writing a parallel one..

Key features include The Decision Ladder: Forces the agent through six escalating checks — skip it, reuse existing code, use the standard library, use a native platform feature, use an installed dependency, write one line — before it is allowed to write new code., Three Intensity Levels: 'lite' builds what you asked and names the lazier alternative for you to choose, 'full' enforces the ladder with the shortest diff and explanation, and 'ultra' ships the one-liner and challenges the requirement itself., Over-Engineering Review Command: /ponytail-review scans the current diff and points out code that could have been avoided or collapsed., Whole-Repo Bloat Audit: /ponytail-audit scans an entire repository for accumulated over-engineering rather than only the working diff., Technical Debt Ledger: /ponytail-debt collects the shortcuts the agent deliberately deferred into one tracked list so nothing is silently lost..

Ponytail is useful for anyone interested in Controlling Agent Code Bloat: Stop a coding agent from generating a fifty-line class where a standard-library one-liner has the same behavior and none of the maintenance cost., Lowering Token and API Spend: Cut the cost of agent-driven development by reducing how much code the model writes and re-reads on each task., Reviewing an Agent-Written Diff: Run a targeted over-engineering pass on a pull request before merging code an agent produced., Auditing an Existing Codebase: Scan a repository that has accumulated agent-generated code to find abstractions and helpers that duplicate what already exists., Enforcing Reuse Over Reinvention: Push an agent to find and use the helper, util or pattern already living in the codebase instead of writing a parallel one..

Ponytail is free to use.

Visit https://ponytail.dev/ to sign up and explore Ponytail.