Critique My Windfall Split Before I Pull the Trigger

You've already sketched the split: a bit on debt, a bit invested, a bit on the kitchen. Before you move the money, this pulls each bucket apart and asks whether the percentage is justified given your debts, rates and income. It flags the opportunity costs you've talked yourself out of seeing. Best for second-guessing a plan you're nearly sold on.

Here is the allocation I am planning for my {WINDFALL_AMOUNT} windfall: {PROPOSED_ALLOCATION} (e.g., 40% debt payoff, 30% index funds, 20% home improvement, 10% holiday). Please critique this plan rigorously. For each bucket, assess: (1) whether the percentage is financially justified given my stated debts of {TOTAL_DEBT} at {AVG_INTEREST_RATE}% average rate and my income of {ANNUAL_INCOME}, (2) any opportunity costs I am ignoring, (3) behavioural biases that might explain the allocation (anchoring, present bias, mental accounting), and (4) a suggested revised split with justification. Be direct and do not soften criticism. I want an honest assessment, not validation.