Three well-named, read-only tools with clear descriptions and proper input schemas. Naming follows verb_noun convention (list_tables, describe_table, read_query). All tools have descriptions (34 - 194 chars, within baseline 34 - 392 range). Input schemas present with type definitions and parameter descriptions. Output formats documented in descriptions (Markdown table, schema text, list). Main gaps: no output schema formally documented in JSON Schema; no error handling guidance (e.g., 'table not found' should suggest alternatives); no pagination for read_query results despite MAX_ROWS cap; missing tool annotations (readOnlyHint). Security is strong (read-only by construction, input validation via _ensure_read_only regex), but error messages could guide recovery better.

• Add formal JSON Schema output definitions for each tool. E.g., list_tables returns {type: 'array', items: {type: 'string'}}; read_query returns {type: 'object', properties: {table: string, truncated: boolean, row_count: integer}}.
• Enhance error messages with recovery hints. E.g., ValueError in describe_table should catch and return 'Unknown table "X". Available tables: [list]. Call list_tables() to discover all tables.'
• Add readOnlyHint: true to all three tools in their MCP registration to signal safety to clients.
• Document the actual MAX_ROWS value in read_query description: 'Max rows to return (capped at 100 by default; set SQLITE_MAX_ROWS env var to override).'
• Consider adding a query_explain tool that returns EXPLAIN QUERY PLAN output, helping LLMs understand performance implications before running expensive queries.