Zabbix MCP server demonstrates good definition quality with consistent naming patterns, detailed parameter descriptions, and proper schema definitions. All 6 tools follow verb_noun naming conventions (api_version, action_get, maintenance_get, maintenance_create, configuration_export, configuration_import). Descriptions are substantive (150-350 chars on average) and explain WHAT the tool does, WHEN to use it, and what it returns. Parameters include type definitions and descriptions. However, there are gaps in output schema documentation, no error handling guidance in tool descriptions, and some parameter constraints could be more explicit (e.g., enum values for format_type in configuration tools).

• Add explicit output schema documentation to every tool. For api_version, document that it returns {version: string, ...}. For action_get, document the shape of returned action objects and pagination metadata (total, has_more, etc.).
• Enhance error handling guidance in descriptions. E.g., configuration_import should state: 'Returns validation errors if import format is invalid or conflicts exist. Errors include field name and resolution guidance.'
• Convert format_type to a formal enum constraint: {"type": "string", "enum": ["json", "xml", "yaml"]} instead of relying on description text.
• For maintenance_create, add a simple example in the description or separate parameters: 'For a one-off maintenance window (no recurring pattern), omit timeperiods; the tool will create a single period spanning active_since to active_till.'
• Document the total count and pagination strategy in action_get and maintenance_get. Clarify whether 'total' is always returned, and how to detect end-of-results (is_more=false vs offset >= total).
• Add dependency hints to configuration tools. E.g., 'Call configuration_export first if you want to see the structure of templates/hosts before importing'.

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

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