Single tool with basic schema and Chinese-language description. Tool name 'read_excel' follows verb_noun convention (+). Input schema present with Zod types and descriptions (+). However, description is in Chinese, limiting LLM comprehension in English-first systems. No output schema documented. Error handling returns text blobs without structured guidance. No parameter constraints (enums, ranges). Missing critical patterns: no pagination support despite potentially large files, no idempotent hints, no security/permission declarations. Tool is read-only but lacks explicit annotation. Overall definition quality is below median for production tools.

• Add English description (50-150 chars): 'Read and preview an Excel or CSV file, returning column headers and first 10 rows. Specify sheetName for multi-sheet workbooks. Returns structured table data suitable for analysis or further processing.'
• Document output schema: {type: 'object', properties: {fileName: string, sheetName: string, headers: string[], rows: (string|number)[][], rowCount: number, isTruncated: boolean}}
• Add limit parameter (default 10, max 100) and return rowCount + isTruncated flag so agent knows if data was truncated and can request more rows.
• Replace error text responses with structured errors: {error: 'FILE_NOT_FOUND', message: 'File not found at path...', suggestion: 'Verify file path and permissions'}
• Add path validation: document that filePath must be absolute or relative to working directory; reject paths containing '..' to prevent traversal attacks.