lotw-mcp presents a domain-specific, focused tool set for amateur radio QSO (contact) queries and log management. All 6 tools are explicitly registered with descriptions and input schemas visible in server.py. Naming is verb-noun consistent (get_version_info, lotw_confirmations, lotw_qsos, etc.), and all tools have meaningful descriptions (100-250 chars). However, several definition quality gaps prevent a higher score: (1) error handling is minimal, all tools catch exceptions and return `{"error": str(e)}`, which provides no recovery guidance; (2) output schemas are not formally documented (no return type hints beyond `dict[str, Any]`); (3) parameters like 'since' and date range filters lack explicit format validation hints; (4) no pagination pattern documented for list-returning tools (lotw_confirmations, lotw_qsos likely return lists); (5) no tool annotations (readOnlyHint/destructiveHint/idempotentHint) despite all tools being read-only. The server is well-named and domain-appropriate but falls short of production polish.

• Document output schema for each tool. Example for lotw_confirmations: 'Returns: {"total_count": int, "confirmations": [{"callsign": str, "qso_date": str, "band": str, "mode": str, "dxcc_code": int, ...}], "error": str|null}'
• Replace generic exception handling with categorized errors. Example: 'persona not found: call get_persona_list() first' or 'LoTW API timeout: retry in 30 seconds' or 'invalid date format: use YYYY-MM-DD'
• Add pagination to lotw_confirmations and lotw_qsos: 'limit (1-100, default 20): maximum records per call' and 'offset (default 0): starting position'. Document that results are truncated and recommend pagination.
• Add explicit date range constraints to parameter descriptions. Example: 'since (YYYY-MM-DD, default last 30 days): QSLs received on or after this date. Max lookback: 10 years.'
• Add readOnlyHint annotation to all tool definitions. In fastmcp, use @mcp.tool(metadata={"readOnly": true}). This signals LLMs that calls are idempotent and safe to retry.
• Document the relationship between 'qsl_only' and result content in lotw_download. If qsl_only=True, confirm that unconfirmed QSOs are excluded from returned ADIF.
• For lotw_user_activity, clarify the freshness of the cached user activity CSV. 'Uses a locally cached copy refreshed weekly', document the last update time and suggest fallback if data is stale.