Single tool 'get_text_length' has a basic description in Japanese but lacks English documentation and proper schema structure. The tool is defined via FastMCP decorator with minimal metadata. Input schema is present (text: string) but lacks formal JSON Schema with type/description separation. No output schema documented. Description is 120 chars but mixes docstring format with parameter docs, not optimized for LLM selection. No error handling guidance, no parameter constraints, no recovery paths. Naming is acceptable (verb_noun) but description quality is below baseline (194 chars avg for A+ tools). Tool is READ_ONLY but lacks explicit annotation.

• Translate description to English and expand to 150-200 chars: 'Get the character count of a text string. Use this to measure text length before sending to APIs with character limits. Returns an integer count of characters after stripping whitespace.'
• Document output schema explicitly: 'Returns: int, the number of characters in the input text after whitespace normalization.'
• Add parameter constraint in description: 'text (str): The input text to measure. Must be a non-empty string; leading/trailing whitespace and quotes are stripped before counting.'
• Add error handling: Return structured error if text is empty or None, e.g. '{"error": "text cannot be empty", "suggestion": "provide a non-empty string"}'
• Add readOnlyHint annotation to tool schema to signal safety to clients: 'readOnlyHint: true'