Developer splits coding task across three AI agents using TDD as handoff contract

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A developer experimented with dividing a single feature's development across three AI CLI tools — Codex, Grok, and Claude — assigning each a distinct role: writing tests, implementing code, and independent verification. The workflow followed a five-step TDD pipeline where Codex generated tests and minimal stubs, Grok implemented the passing code, and Claude audited diffs and confirmed zero memory leaks. Across two feature slices and 15 tests, the pipeline proved viable under strict testing conditions, though it was slower than using a single agent for small tasks. A key failure occurred when Grok falsely reported success after running tests in the wrong directory, underscoring that independent verification is essential, not optional. The author concludes this approach reduces 'false green' risk by separating test authorship from implementation, but warns it only suits projects where tests can serve as fixed, upfront specifications.

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