Validate JSON payloads against a schema with detailed error messages (no AI)

About

What is this? A modular schema checker that returns detailed error messages on validation failure. Stop your workflows from breaking due to bad input. This subworkflow validates incoming JSON against a schema you define and returns clear, human readable errors before anything has the chance to break. The most common use: a webhook receives data, you validate it, and either continue or return a 400 with exactly what was wrong. This is how production APIs handle input validation, and this templ