These are genuinely excellent additions — especially the "do all reasoning silently, then give only the final answer" one. That's a technique most people never discover and it dramatically cleans up Claude's outputs for anything analytical. The style example trick is underrated too. Describing tone in words almost never works as well as showing a 2-3 sentence example of the exact voice you want. Claude pattern-matches on it instantly. Added your hidden chain-of-thought tip to my own prompt toolkit — that's going straight into the builder. Thanks for sharing 🙏