When an AI coding assistant writes both your application code and the tests that check it, you have one system grading its own homework. Independent test validation means a separate system, one that did not write the feature, generates and runs the tests that verify it actually works. This matters because AI models trained to produce passing output will often produce tests that pass trivially rather than tests that catch real defects, and the only reliable fix is to separate the author of the code from the author of the verification. Amikoo was designed around this exact separation problem: it generates and executes Playwright tests independently of whatever tool (Claude, Codex, or a human) wrote the underlying feature, then classifies failures as a product defect, a test issue, or an environment issue before attempting any repair. That doesn't mean replacing the coding agent. Claude, Cursor, or Codex can keep writing the code; Amikoo is the separate system that verifies the product actually works.