alko-mcp is a domain-specific service for Finnish alcohol products. Tool definitions are present with descriptions and schemas, but quality is inconsistent. Most tools have reasonable descriptions (100-200 chars) and structured input parameters with type hints. However, several critical gaps exist: (1) output schemas are not explicitly documented, responses are inferred from code structure rather than declared in tool registration; (2) error handling descriptions are absent, tools do not explain failure modes or recovery paths; (3) parameter relationships and constraints are incompletely documented; (4) some parameter descriptions lack actionable detail (e.g., 'City filter' vs 'City name (e.g., Helsinki, Turku, Tampere)')). The server leverages Zod validation and Firestore/Playwright integration, suggesting robust backend logic, but the tool interface itself needs polish for LLM reliability. Scoring reflects solid foundational structure with notable gaps in completeness.

• Declare explicit output schemas for all 9 tools. For example: search_products returns {total: number, products: [{id, name, price, type, country, alcoholPercentage, producer}]}. Document pagination semantics (does limit cap results, or does total_count indicate more available?).
• Add error recovery guidance to all tools that perform external actions (scraping, syncing). E.g., 'If Vivino rating not found, try a simpler wine name or exact winery. If timeout, retry after 30s.' Pattern: recovery-guide.
• Convert 'preferences' (array) in get_recommendations to an enum or union type with documented valid values. Same for 'occasion' and 'foodPairing', enumerate the '33 food categories' explicitly.
• Clarify parameter relationships. For get_store_hours: 'If both storeName and city are provided, filters are combined (AND). If only city is provided, returns all stores in that city.' Explicitly document mutual exclusivity where it exists.
• Add pagination guardrails. State default limits for search_products, list_stores, get_recommendations (e.g., default limit=20, max limit=100). Explain total_count meaning (total matching items, or items in current page?).
• Document permission checks for sync_products. Return actionable error: 'Permission denied: only admin-role agents can call sync_products. Contact your server administrator.'
• Standardize data formats in descriptions. E.g., 'Price in EUR (decimal, e.g., 19.99)', 'Timestamp in ISO 8601 UTC (e.g., 2024-01-15T14:30:00Z)', 'Alcohol percentage as decimal 0 - 100 (e.g., 12.5 for 12.5% ABV)'.

Inferred effective spec: <=2025-11-25.

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