Virtual Library MCP has two tools with explicit schemas and descriptions. browse_catalog_app is well-structured with clear enum constraints and parameter bounds; regenerate_catalog lacks input parameters (empty schema) but has a detailed description explaining multi-stage progress. Naming follows verb_noun convention appropriately. However, output schemas are not documented anywhere in the source, descriptions could be more precise about what data is returned, and error handling patterns are not visible. The server demonstrates good intent but falls short of production-grade definition quality due to missing output documentation and incomplete error guidance.

• Add explicit output schema documentation for browse_catalog_app, specifying: title, author, ISBN, availability_status, copy_count, and any other fields returned by the catalog query.
• For regenerate_catalog, add output schema documenting: success (boolean), completion_percentage (integer 0-100), stage_name (string), message (string), total_records_processed (integer).
• Add error handling guidance to both tool descriptions: 'If no results found, try broadening the search query or removing filters.' and 'If regeneration fails, check database connectivity and retry.'
• Expand regenerate_catalog's input schema to include optional parameters like 'force_refresh' (boolean, defaults to false) and 'parallel_jobs' (integer 1-4, defaults to 1) to enable LLM control over the maintenance process.
• Document whether browse_catalog_app is idempotent (safe to call repeatedly with same params) and regenerate_catalog's impact on concurrent access (does it lock the database?).

Inferred effective spec: 2026-07-28+.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry