Ponytail

Ponytail is not an agent itself -- it's a skill/plugin that attaches to an existing coding agent (Claude Code, Cursor, Codex, GitHub Copilot CLI, and others) and changes how it writes code. Before generating anything, it forces the agent through a decision ladder: does this need to exist at all, is it already in the codebase, is it in the standard library, is there a native platform feature, is it an already-installed dependency, can it be one line -- and only then writes the minimum necessary.

Ponytail is a fit for teams who find coding agents tend to over-engineer (unnecessary abstractions, extra dependencies, speculative flexibility) and want a lightweight, installable correction rather than prompting for it every time. It's a genuinely different category from full agent frameworks (also in this catalog) -- it doesn't build agents, it modifies the behavior of agents you already use.