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Implementing TypeScript features without regressions requires strict adherence to architectural plans and verification protocols, validating all changes through explicit surface-level testing and mandatory sub-agent review.

Vertical slice implementation builds features in complete, testable layers spanning data, API, logic, and UI rather than fragmented chunks, ensuring every architectural layer is functionally integrated and verified before completion.

Verifying feature correctness during software implementation involves applying a verification matrix that enforces real-world validation across all touched surfaces using explicit commands, alongside a mandatory sub-agent review.

To prevent redundant work when developing new features, establish a gate of pre-existence that checks existing documentation and feature status to confirm whether a feature already exists before writing any code.

Yes, this feature implementation workflow requires existing repository documentation, as it strictly follows architectural plans and verification protocols defined there to coordinate development and ensure type safety.

The limitations of test-driven feature implementation include strict dependency on pre-existing repository documentation and the overhead of mandatory sub-agent reviews, which may slow down rapid prototyping.