Answer five questions about the task — how many steps, what tools it needs, whether it needs lookup, whether actions need approval, whether it splits into independent subtasks — and get one recommended pattern from an authored decision tree, with the failure modes and guardrails it needs and why the other five don't fit as well. Free.
Answer what's true of the task itself, not the model you plan to use.
The recommendation, the reasons and the guardrails are free and stay free. Builder's Notes adds what a decision alone can't: how to actually shape the pattern, and when you'll outgrow it.
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Unlocks Builder's Notes on this device and survives reloads. No account, nothing transmitted.