ponytail

Ponytail is a prompt—instructions loaded into an AI coding agent—that tells the agent to write only the code a task needs. ^[1a][1b] It helps the agent look for existing code or built-in features before adding new code, such as reusing an existing Input component and the browser's date picker for a date-picker request. ^[2] It also provides review and audit commands that check changed code or a whole repository for bugs, security issues, missing tests, and code to cut. ^[3]