Critical failures across all dimensions. Tool definitions lack parameter descriptions entirely (null values visible in schema). Descriptions are generic and under 20 chars for most tools. Duplicate tool registrations (add, calculate, test_pagination_cursor appear twice) indicate incomplete or broken implementation. No error handling guidance. Schema validation present via Zod but descriptions missing from parameter definitions.

• Add non-empty descriptions to every parameter. Example: 'a': {'type': 'number', 'description': 'First operand (any real number)'}, 'b': {'type': 'number', 'description': 'Second operand (any real number)'}. Target 50-100 chars per parameter description.
• Expand tool descriptions to 50-200 characters with WHAT, WHEN, WHY context. Example for 'add': 'Adds two numbers and returns the sum. Use when you need basic arithmetic. Returns a numeric result.'
• Rename 'test_pagination_cursor' to 'list_paginated_items' or 'get_paginated_results' to clarify the action. Add description: 'Retrieves paginated items with cursor-based navigation. Supports limit (1-100) and total count filtering. Returns items array and next_cursor for continuation.'
• Remove duplicate tool registrations. Consolidate test/src/index.ts and test-oauth/src/index.ts to register each tool exactly once, or clearly document why duplicates exist.
• Add error handling guidance. For divide-by-zero, return: {'content': [{'type': 'text', 'text': 'Error: Cannot divide by zero. Ensure divisor (b) is non-zero.'}], 'isError': true}. Document which errors are retryable.