Optimizing ToolUniverse Skills Best practices for high-quality research skills with evidence grading and source attribution. Tool Quality Standards 1. Error messages must be actionable — tell the user what went wrong AND what to do 2. Schema must match API reality — run to verify 3. Coverage transparency — state what data is NOT included 4. Input validation before API calls — don't silently send invalid values 5. Cross-tool routing — name the correct tool when query is out-of-scope 6. No silent parameter dropping — if a parameter is ignored, say so Core Principles (13 Patterns) Full details:…