This MCP server has critical definition gaps. Tool descriptions are minimal (10-30 chars), far below the 194-char baseline for production tools. Input schemas are present but lack parameter descriptions entirely, the execute_query tool accepts a 'query' string with no guidance on format, constraints, or SQL dialect. No output schemas are documented. The server exposes a WRITE-risk tool (execute_query) with no error handling guidance, confirmation patterns, or permission checks. Tool naming is acceptable (verb_noun pattern), but the lack of descriptive metadata makes these tools unsafe for autonomous agent use. No tool annotations (readOnlyHint, destructiveHint) are present despite clear risk differentiation.

• Expand execute_query description to 150 - 250 chars: 'Execute a SQL query against the PostgreSQL database. Returns structured results as an array of objects. Supports SELECT, INSERT, UPDATE, DELETE. Requires valid SQL syntax. Use get_schema first to discover available tables. Dry-run not supported, verify queries carefully before execution.'
• Add parameter descriptions: 'query' → 'SQL query string (SELECT, INSERT, UPDATE, DELETE). Must be valid PostgreSQL syntax. Avoid DROP, TRUNCATE, ALTER. Max 10,000 chars.'
• Document output schemas for all tools. E.g., execute_query returns {results: [{column_name: value, ...}], row_count: number, execution_time_ms: number}.
• Add destructiveHint annotation to execute_query and implement a dry_run parameter or confirmation pattern (e.g., 'confirm_before_execute': true) to prevent accidental data loss.
• Add permission checks: verify the calling agent has 'write:database' scope before allowing execute_query. Log all WRITE operations with timestamp, query, and agent ID for audit trails.