Single tool 'fetch_data' has a reasonable description (194 chars) but critical schema deficiencies. Input parameter 'filters' is typed as 'object' with no formal schema constraints, no enum values, no min/max bounds, and no per-field type definitions. The description lists possible keys (brand, model, fuel, etc.) as free-form text rather than a structured schema. Output schema is undocumented, no field types, no pagination support despite potentially returning many cars. No error handling guidance. Tool name 'fetch_data' is generic and does not follow verb_noun convention (should be 'search_cars' or 'list_cars'). No parameter descriptions for individual filter fields. Lacks idempotency hints, rate-limit guidance, and result-limiting documentation.

• Rename 'fetch_data' to 'search_cars' to follow verb_noun convention and clarify intent.
• Replace free-form 'filters' object with a structured schema: define each filter field (brand, model, year_min, year_max, fuel, color, transmission, price_min, price_max) with explicit types (string, integer, enum) and descriptions.
• Add output schema documentation: return {cars: [{id, brand, model, year, fuel, color, transmission, price, mileage}, ...], total_count, limit, offset}. Cap results at 50 and document pagination.
• Add error handling guidance: 'If no cars match filters, returns empty list. If filters are invalid, returns error with constraint details. Retry with adjusted filters.'
• Document idempotency and rate limits in description: 'This tool is read-only and idempotent. Rate limit: 100 calls/minute per agent.'

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

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