Rules Health Check by Handoff

Paste a rules file and it scores length, hierarchy, wording, sectioning, duplication and the risk of the file being compacted away, then lists concrete fixes. For anyone whose coding agent ignores half its instructions, that is a useful diagnosis, because the usual cause is a rules file that is too long or too vague rather than a model that will not listen.

Everything runs in the browser and nothing is uploaded, which matters because a rules file usually describes a private codebase in some detail. There is no account and no payment.

It is a lead magnet for Handoff, the commercial product behind it, and the page says so - expect prompts toward the paid offering. The scoring is one team's opinion of what good rules look like rather than a standard, so treat a low score as a prompt to reread your file, not as a defect report.