Mixed quality across 9 tools. All tools have descriptions (above median length at 70-120 chars), and most have basic parameter schemas with types. However, several critical gaps limit effectiveness: (1) list_databases lacks any visible description or input schema, cannot verify its behavior; (2) parameter descriptions are minimal (6 - 15 chars for most), providing almost no context for LLM selection or usage; (3) no output schemas are documented, LLMs cannot predict return structure; (4) execute_query (a dangerous WRITE tool) lacks error guidance and timeout enforcement details; (5) complex tools like analyze_table_statistics and profile_semi_structured_columns have poorly described array parameters and nested objects, forcing LLMs to guess structure. Naming is clear (action verbs + nouns), but descriptions read like API docs rather than LLM-optimized prompts. Parameter constraints are loose, no enums, min/max bounds, or validation hints.

• Add description to list_databases: 'List all databases available in the connected Snowflake account. Use this to discover database names before calling list_schemas.'
• Document output schemas for all tools. Example for list_schemas: returns {databases: [{name: string, owner: string, created_at: string}], total_count: integer}
• Expand parameter descriptions to 40 - 80 chars with context and examples. Example: database param → 'The Snowflake database name (e.g., ANALYTICS, PRODUCTION). Must exist and you must have READ access.'
• For execute_query, add explicit guidance: 'This tool executes arbitrary SQL and may modify data. Returns results as structured objects. Timeout must be in format like "5m", "30s", or "2h".'
• For array parameters in analyze_table_statistics and profile_semi_structured_columns, document expected structure: 'columns_to_analyze: array of objects with {column_name: string, data_type: string, supported_stats: array<string>}'
• Add enum constraints where applicable. Example: for include_null_empty_profile, clarify it is boolean (not open-ended). Consider adding ordered parameter documentation (required vs optional).
• For execute_query, add dry-run or validation option: offer a separate 'validate_query' tool that checks syntax without execution, reducing risk of accidental destructive queries.
• Add pagination guidance to list_* tools. Specify: 'Returns up to 100 results by default. Use limit and offset parameters for pagination if not visible.'
• Document error scenarios for each tool. Example for execute_query: 'On SQL error, returns error message with line number. On timeout, returns "Query exceeded {timeout} limit; try with longer timeout or simpler query."'