Ponytail

Ask an agent to add a date picker to your site and it will happily pull in a new library or build a calendar from scratch in hundreds of lines. Ponytail changes that habit: before writing anything, the agent climbs a ladder of seven questions. Is this needed at all, is there something ready in the project, in the standard library, in the browser itself, in a dependency that is already installed, can it fit in one line. It only starts writing its own code on the last rung. The skill does not let it cut input validation, error handling, security or accessibility.

What sets it apart from caveman, its neighbour in this catalogue, is that it saves on the code itself rather than on reading: caveman trims what the agent reads from the project, Ponytail trims what the agent writes. The whole skill is a single prompt; the rest of the repository plugs it into different agents. Version 5 added senior-style code review and audit, plus a panel in Claude Code that shows what the current task costs.