Single tool with critical definition gaps. Tool name 'read_memo' lacks action verb clarity (should be 'get_memo' or 'read_file'). Description is in Japanese only, non-standard for LLM consumption. Parameter 'relative_path' has minimal description (18 chars, below 20-char threshold). No output schema documented. No error recovery guidance. No parameter constraints (format, length, allowed patterns). Violates multiple baseline patterns for production-grade tools.

• Translate tool description to English: 'Read the contents of a memo file from the Obsidian vault by relative path. Returns the full file content as plain text. Use this to retrieve note content for analysis or display.'
• Expand parameter description: 'relative_path (string, required): Path to the memo file relative to the vault root. Must be a valid file path (e.g., 'folder/note.md'). No absolute paths or '..' sequences allowed. Max 255 characters.'
• Add input validation: reject paths containing '..' or starting with '/', validate against filepath.IsAbs(), use filepath.Clean() and verify result stays within vault directory.
• Document output schema: 'Returns: {content: string (file contents as UTF-8 text), path: string (normalized path), size_bytes: number}'
• Enhance error messages with recovery guidance: 'File not found: <path>. Verify the file exists in your vault. Call list_memos() to see available files.' Return structured error with error_code and suggested_action fields.