BytePro MCP Core demonstrates solid naming conventions and comprehensive security-focused descriptions, but suffers from incomplete schema visibility, missing parameter descriptions on some tools, and lack of explicit output schema documentation. Of 4 tools evaluated: list_tables and describe_table have minimal input requirements but lack documented output schemas; query_read has good parameter descriptions but no output schema defined; add_customer has the most detailed parameter schemas with validation constraints. The codebase shows strong security architecture (auditLog, capability enforcement, quota management) but this is implementation-level, tool definitions themselves lack the clarity expected for production LLM agents. No tool annotations (readOnlyHint, destructiveHint, idempotentHint) are present despite risk classifications being tracked internally.

• Document the exact output schema for each tool. Example for list_tables: 'Returns { tables: string[], total: number }' so LLMs know what fields to expect.
• Add tool annotations to all tools: list_tables, describe_table, query_read with readOnlyHint=true; add_customer with destructiveHint=true. Map internal Risk classification to standard annotations.
• Enhance describe_table description to include discovery guidance: 'Call list_tables first to see available tables, then call this to examine schema for a specific table.'
• Add parameter constraints to describe_table.table: enum of valid table names (fetched at server init), or regex pattern matching your table naming convention (e.g., '^[a-z_]+$').
• Expand query_read description to clarify parameterization: 'SQL SELECT query with ? placeholders (MySQL/MSSQL) or $1, $2 (PostgreSQL). Params array passed in order and bound at execution.'
• Add error recovery hints to all tool descriptions. Example: 'If table not found, call list_tables to see available tables. If query fails due to syntax, ensure all column names and table references are quoted properly.'
• For add_customer, document dry-run / confirmation flow if available, or clearly state: 'This operation is irreversible. Verify address_id exists before calling. No undo capability.' Add example foreign key error response.
• Document pagination for list_tables if supported (limit, offset, next_cursor). If not paginated, state maximum result count to prevent context window overflow.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry