Single tool with minimal definition quality. Tool name 'hello_world' lacks action verb (should be 'greet_user' or similar). Description is adequate (47 chars) but generic. Input schema present with type and description for 'name' parameter. No output schema documented. No error handling guidance. Tool is READ_ONLY but lacks explicit annotation. Overall definition follows basic structure but falls short of production patterns.

• Rename tool from 'hello_world' to 'greet_user' to follow verb_noun convention and signal action intent to LLMs.
• Document output schema explicitly: 'Returns: {greeting: string}' so LLMs know what to expect.
• Expand description to 50-150 chars explaining purpose and use case: 'Generate a personalized greeting message. Use when you need to welcome a user or create a friendly introduction.'
• Add readOnlyHint annotation to tool schema to explicitly mark it as safe/non-destructive.
• Add parameter validation and error handling: validate name length, return actionable error messages if input is invalid.