Three tools with clear verb-noun naming (search_flights, get_offer, search_stays) and solid descriptions (150-180 chars each). All parameters have type definitions and descriptions. Schemas use Zod with proper enums and optional markers. Output structure is JSON-formatted but not formally documented in the tool definitions. Error handling returns actionable messages ('search_flights failed: <message>'). Main gaps: no output schema documentation, no pagination support despite potentially large result sets, no parameter constraints (min/max for numeric fields), and no idempotency hints for read-only operations.

• Document output schemas formally. Add a 'returns' section to each tool description or create a separate schema document specifying: search_flights returns {offers: [{id, price, airline, slices: [{stops, duration}]}]}, get_offer returns {offer: {...}}, search_stays returns {stays: [{id, name, rating, cheapest_rate}]}.
• Add numeric constraints to Zod schemas: z.number().min(1).max(9) for adults, z.number().min(1).max(100) for limit, z.number().min(0.1).max(50) for radius_km. Update descriptions to state these bounds.
• Add date format validation: z.string().regex(/^\d{4}-\d{2}-\d{2}$/) for all date parameters, with description: 'ISO 8601 date (YYYY-MM-DD), e.g., 2026-09-15'.
• Declare tool annotations in server.tool() calls: add readOnlyHint: true and idempotentHint: true to all three tools to signal safety to clients.
• Document default pagination behavior: state that limit defaults to 10 and max is 100; if results exceed limit, document whether a next_cursor or offset is returned for pagination.