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• Add explicit input schema to refresh_member_data with type definitions (even if empty, declare {} with description 'No parameters required')
• Add an output schema definition for both tools documenting the structure of returned dicts/lists and their field types
• Document the query_members_sql 'sql' parameter with explicit constraints: length limit (e.g., 5000 chars), forbidden keywords (INSERT, UPDATE, DELETE, DROP), and result limit (e.g., 'Limited to 100 rows per query')
• Enhance error responses with actionable guidance: instead of 'SQL 执行错误: <error>' return 'SQL syntax error: <detail>. Ensure query uses valid SQLite syntax and only SELECT statements. Available tables: members.'
• Add a LIMIT clause enforcement or result cap to query_members_sql (suggest LIMIT 100) to prevent context window exhaustion
• Refactor the database schema documentation: move exhaustive field list to a separate /data/SCHEMA.md file and summarize in tool description to under 300 characters
• Add examples of safe vs unsafe queries in the docstring to clarify SQL injection prevention
• Document the cache TTL behavior and auto-refresh logic in the refresh_member_data description so LLMs understand when data becomes stale