MaxMindDB MCP server has 4 well-named tools with clear action verbs (lookup_*, list_*, update_*). All tools have descriptions and most parameters have type annotations and descriptions. However, schema documentation is incomplete, output schemas are not explicitly documented in the source, array parameters lack item type definitions, and filter object structure is described only in text. Error handling returns structured error objects but lacks actionable recovery guidance. The lookup_network tool has complex nested parameter logic (filters with field/operator/value) that is documented in text rather than formal schema constraints, forcing LLMs to parse domain-specific syntax. Overall: solid foundation with professional naming and parameter coverage, but schema completeness and output documentation could be stronger.

• Document output schemas for all 4 tools. For lookup_ip: specify returned fields (country, city, latitude, longitude, ISP, user_type, etc.). For lookup_network: document paginated result structure (results array, total_count, next_cursor). For list_databases: define database object schema (name, type, description, path, last_updated). For update_databases: document success response (databases_updated, timestamp, summary).
• Define filter schema for lookup_network as a formal JSON Schema object constraint: itemType with properties {field: string, operator: enum[equals|not_equals|in|not_in|contains|regex|greater_than|...], value: (string|number|array)}. Make operator an enum rather than free-form text.
• Add bounds to max_results parameter: minimum 1, maximum (e.g.) 10000. Document default behavior (default: 1000, returns first 1000 results).
• Document iterator protocol: explain when iterator_id expires, what resume_token format is, whether old iterators persist across restarts. Or simplify to standard offset/limit pagination.
• For update_databases, add optional 'dry_run' boolean parameter (default: false) to preview changes without applying. Alternatively, add a 'confirm' parameter requiring explicit true, and return a preview on first call.
• Enhance error messages with recovery guidance. E.g., 'Database "geoip2-city" not found. Available: [list]. Call list_databases() to refresh.'
• Trim lookup_network description to ~150 chars; move filter syntax details into separate parameter documentation or a help tool.

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

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