Three well-named, read-only tools with clear descriptions (avg 156 chars, within 10-1024 baseline). All tools have explicit input schemas with typed parameters and descriptions. Output is structured JSON with pagination awareness and safety caveats. Naming follows verb_noun pattern (list_, sales, revenue_summary). Key strength: descriptions include operational context ('what am I actually selling right now?', 'store health check'). Weakness: no error handling guidance, no parameter constraints (enums/ranges), no output schema documentation in code comments.

• Add regex pattern or format constraint to date parameters: after/before should enforce YYYY-MM-DD via JSON Schema format:'date' or pattern:'^\d{4}-\d{2}-\d{2}$'.
• Document output schemas as JSON Schema in docstrings or comments. Example: 'Returns {count: int, products: [{name: str, price: str, published: bool, sales_count: int}]}'.
• Add error recovery hints to descriptions: 'Requires GUMROAD_ACCESS_TOKEN env var. If 401, verify token at https://app.gumroad.com/settings/advanced. If 429, wait before retrying.'
• Clarify list_products() pagination: state whether all products are returned in one call or if pagination is needed for large stores. If unbounded, add a limit parameter.
• Add parameter descriptions for product_id in sales(): clarify format (UUID, slug, or numeric ID) and whether it must be from list_products() output.