The server defines 4 tools with basic functionality for NVD vulnerability queries. Tool naming follows verb_noun convention consistently (nvd_get_cve, nvd_search_cves, nvd_search_cpes, nvd_get_cve_history). All tools have descriptions present and input parameters are typed with descriptions. However, several significant quality gaps exist: (1) Output schemas are not documented in the source code, we can see async functions return 'dict' but no actual response structure is visible; (2) Parameter descriptions are present but minimal (1-10 words), lacking detail on formats, ranges, constraints, and when to use one tool vs another; (3) No error handling guidance visible, tools call service methods that may fail but no recovery instructions are documented; (4) Missing parameter constraints, date parameters accept 'ISO format' strings but no regex, min/max, or validation guidance; (5) No pagination documentation despite search tools accepting 'limit' parameters, and no indication of result structure (is it a list? paginated object?); (6) Services are called but their implementations are not visible in the provided code, preventing full schema verification. The tool definitions work but are barebones and would require LLM reasoning to infer correct usage patterns.

• Document output schemas for all 4 tools. Example: nvd_get_cve returns {cve_id: string, description: string, cvss_v3_score: number, published_date: string, references: [string], ...}. Update tool docstrings or add JSON Schema examples in descriptions.
• Expand all parameter descriptions to 20-100 characters with explicit constraints. Example: 'pub_start_date: Publication start date (ISO 8601 format, e.g. 2024-01-15). Inclusive. Use with pub_end_date to filter a date range.' instead of just 'Publication start date in ISO format'.
• Add min/max bounds to numeric parameters. Example: 'limit: Maximum number of results to return (1-1000, default 10). Larger limits may increase API latency.'
• Document pagination/result limits. Specify: 'Results are limited to {N} items per call. Use offset/cursor parameters (if applicable) to iterate through large result sets. Returns total_count for planning.'
• Add recovery hints to tool descriptions. Example: 'nvd_get_cve: If CVE ID is not found, try nvd_search_cves with keywords instead to discover related CVEs.'
• Clarify filter relationships. Add to nvd_search_cves description: 'Filters are AND-ed together. Omit filters you don't need, searching with all parameters may return zero results. Common patterns: search by keyword alone, or by cpe_name + severity, or by date range.'
• Implement tool annotations (readOnlyHint) to signal these are query-only tools. Add @mcp.tool() decorator metadata or MCP schema hints indicating risk=READ_ONLY (already present in summary but should be in schema).