Five tools with reasonable naming conventions (all verb_noun pattern) and functional schemas. However, descriptions are minimal (15 - 28 characters), falling well below the 50 - 200 char optimum for LLM-driven tool selection. No parameter descriptions provided across any tool, violating the 100% baseline for A+ tools. Schemas are present but sparse, only required fields declared, no constraints, enums, or ranges. No documented error handling or output schemas. No tool annotations (readOnlyHint, destructiveHint, idempotentHint) despite clear semantic differences (list/get are read-only; delete is destructive).

• Expand tool descriptions to 50 - 150 characters. Example for create_todo: 'Create a new todo item with a title. Returns the created todo with its ID. Use this when the user wants to add a task to their list.' This answers WHAT, WHEN, and returns.
• Add descriptions to every parameter. Example for update_todo 'todo_id': 'The unique identifier of the todo to update (positive integer, required).' For 'title': 'The new title for the todo (1-200 characters, optional, if omitted, title is not changed).'
• Add tool annotations via the MCP spec. For list_todos and get_todo, set 'readOnlyHint: true'. For delete_todo, set 'destructiveHint: true'. For create_todo and update_todo, set 'idempotentHint: false' to signal they have side effects.
• Document output schema for each tool. Example for create_todo: 'Returns {todo_id: integer, title: string, completed: boolean, created_at: ISO-8601 timestamp}.' Include this in tool description or as a schema annotation.
• Add per-parameter constraints. Set maxLength: 200 on 'title'. Set minimum: 1 on 'todo_id'. Add enum or pattern where applicable (e.g., completed is boolean).
• Implement error recovery guidance. For duplicate title errors, suggest: 'A todo with this title already exists. Try list_todos() to view existing todos or use a different title.' For invalid IDs, return: 'Todo ID {todo_id} not found. Use list_todos() to see available IDs.'
• Add optional confirmation step to delete_todo. Require an 'are_you_sure' boolean parameter or implement a two-phase delete (mark_deleted → confirm_delete) to prevent accidental data loss by agents.