Mistake 1: Vague objectives
Bad: "Analyze this"
Fix: specify desired outcome and decision context.
Mistake 2: Mixed instructions and context
When instruction and source text are mixed, outputs drift.
Fix: keep instruction in prompt body, move dynamic content into fields.
Mistake 3: No output format
Unstructured output is harder to review and reuse.
Fix: require numbered sections or a known schema.
Mistake 4: One prompt for everything
Overloaded prompts produce inconsistent quality.
Fix: split workflows into specialized templates.
Tip
Use PromptPlan run history to diagnose mistakes with real examples, not assumptions.