Purple MCP has 33 tools across security domains (alerts, vulnerabilities, misconfigurations, inventory, threat intel, CVE). Tool naming follows verb_noun conventions consistently (get_*, list_*, search_*). Descriptions are present for all tools but vary significantly in quality and completeness. Critical gap: parameter schemas are not visible in provided source, only tool names and basic descriptions are evident. Without access to actual parameter definitions, schema validation cannot be confirmed. Risk assessment shows all tools are READ_ONLY, which is appropriate for a security analytics platform. The server imports tool definitions from separate modules (alerts.py, sdl.py, etc.) but the actual parameter schemas, types, and constraints are not shown in the excerpt provided, making it impossible to verify JSON Schema compliance for input validation or output structure documentation.

• Expand all tool descriptions to 150-250 characters. Include: what the tool does, when to call it (vs similar tools), and what it returns. Example: 'Retrieve a specific alert by ID. Use this after list_alerts or search_alerts returns an alert_id. Returns full alert details including status, severity, and timestamp.'
• Document input parameter schemas explicitly in tool registration. For each parameter, specify: name, type (string/integer/boolean/array/object), description (20+ chars), constraints (min/max, enum values, regex patterns), and whether required. Validate inputs server-side and return actionable error messages on constraint violation.
• Document output schemas. For list_* and search_* tools, document: field names, types, pagination mechanism (limit/offset/cursor), total count if available, and required IDs for chaining to other tools. Example: 'Returns array of alert objects with fields: alert_id (string), status (enum: open|in_progress|closed), severity (enum: critical|high|medium|low), timestamp (ISO 8601), investigation_report_id (string for get_alert_investigation_report).'
• Clarify get_* vs list_* vs search_* intent. If list_alerts returns all/filtered alerts and search_alerts also filters by criteria, merge them into one search_alerts tool with optional filters. Or explain in descriptions: 'list_alerts returns alerts in default order with optional status filter; search_alerts enables full-text query and advanced criteria.' Currently too similar.
• Add error handling documentation. For each tool, document common failure modes: invalid ID (return 'Alert ID not found. Try search_alerts to find the ID.'), permission denied, rate limited, backend timeout. This guides LLM recovery.