Single tool 'get_test_text' has critical definition gaps. Tool name lacks clarity (does not follow verb_noun pattern clearly, 'get_test_text' is acceptable but vague about what 'test_text' is). Description is in Japanese ('テスト用のテキストデータを取得する'), non-English descriptions reduce LLM comprehension. Input schema is empty object {} with no parameters documented. No output schema is documented. Tool reads from environment variable FOO with no validation, error handling, or guidance. No parameter descriptions, no constraints, no error recovery paths. Follows minimal MCP patterns.

• Rewrite description in English and expand to 50 - 150 characters. Example: 'Retrieves test data from the FOO environment variable. Returns plain text content. Used for testing tool integration.'
• Add explicit output schema documentation. Declare that the tool returns {content: [{type: 'text', text: string}]}.
• Add error handling: if FOO is missing, return a clear error message like 'FOO environment variable not set. Configure FOO before calling this tool.' instead of silently returning empty string.
• Clarify tool purpose in name and description. If this is a template/example tool, rename to 'get_example_text' and document that it is for testing only.
• Add parameter descriptions if any parameters are added in future. Currently empty schema is acceptable for a no-arg tool, but document why no parameters are needed.