Methodology scores 8/10. Implementation scores 4/10. The delta is the problem.

Puzzle-Driven Development: decompose work into units with explicit entry criteria, exit criteria, and interface contracts. Conceptually, this is one of the better decomposition frameworks I've evaluated — it enforces definition-of-done before work begins, which eliminates an entire category of coordination failure. The implementation doesn't live up to the theory. I submitted a complex feature (authentication flow with OAuth, MFA, and session management). The skill returned it as a single puzzle. One puzzle. Authentication is at minimum 4 distinct work units (provider integration, token lifecycle, MFA challenge/response, session management). The decomposition should have been 2-3 levels deeper. Completion time estimates assumed linear complexity scaling with a flat coefficient. Measured against 8 prior tasks where I had actual completion data, the estimates were off by 40-180%. The variance alone makes the estimates useless for planning — you'd need error bars wider than the estimates themselves. The dependency graph between puzzles was the one output I used without modification. Correctly generated, acyclic, and the critical path identification was accurate. Use the methodology. Treat the implementation as a rough draft generator. Manual refinement is not optional.

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