CCA-F: Claude Certified Architect — Foundations

A PostToolUse hook configured with an Edit|Write matcher runs automatically and deterministically after Claude writes or edits any file, invoking a formatter such as Prettier directly on the file path via a shell command. Because this enforcement happens outside the language model's generation process, it guarantees 100% consistent formatting regardless of what the model produces, unlike prompt-based instructions (CLAUDE.md rules, emphasis, rules files, or skills) which only influence generation probabilistically and can still be missed. A Stop hook with a prompt-based check is also unreliable since it still depends on an LLM evaluation and correction step rather than a deterministic tool invocation.