Two tools with basic schemas and descriptions, but significant gaps in parameter documentation and output structure. Tool names follow verb_noun convention (get_document_list, get_document). Descriptions exist but are brief (Japanese text, 20-60 chars when translated). Input schemas use Zod with enums and regex validation, but lack comprehensive parameter descriptions in the schema itself. No documented output schemas. Error handling returns isError flag but lacks recovery guidance. Parameters like 'type' are enums but descriptions are minimal. Overall: functional but below production baseline (194 char avg description, 100% param coverage expected).

• Expand parameter descriptions to 50 - 150 chars each. For 'type' enum, replace numeric codes with human-readable labels: type: enum(['full_text_audit_zip', 'pdf', 'alternative_docs_zip', 'english_zip', 'csv_zip']) with descriptions for each.
• Document output schemas explicitly. E.g., 'Returns: { status: number, message: string, results: Array<{ docID: string, date: string, ... }>, total: number }'. Include pagination fields if applicable.
• Add error classification to error responses. E.g., 'EDINET API Error (retryable): Rate limit exceeded. Retry after 60 seconds.' or 'Invalid docID format (user-fixable): Must be 8 digits.'
• Expand tool descriptions to 100 - 200 chars in English. Include WHEN to use (e.g., 'Call this to retrieve a list of all EDINET filings submitted on a specific date') and WHAT IT RETURNS (e.g., 'Returns metadata and optional document list').
• Add idempotentHint or destructiveHint annotations to tools. Mark get_document as destructive (downloads/overwrites files) and get_document_list as read-only. This guides agent retry logic.