Single tool with severely limited documentation and schema definition. The compare_products tool has a reasonable description (88 chars, within baseline 34-392 range), but input parameters lack individual descriptions, they only have type and high-level summary. No output schema is documented, violating the 'Document the output schema' critical check. The tool definition is visible in client.py, so not inferred, but the absence of parameter-level descriptions and output schema documentation places this well below production standards.

• Add full parameter descriptions: 'records: List of product record dictionaries. Each dict should contain string values (title, body, description, etc.) that will be searched. Example: [{"title": "Product A", "body": "..."}, ...]' and 'query: Search query string; terms are split on whitespace and matched case-insensitively against concatenated record values.'
• Document output schema explicitly: '{"status": "ok"|"error", "query": string, "matches": [{"rank": integer (1-indexed), "record_index": integer (position in input records list), "score": number (0-1, hits/max(1,len(terms))), "evidence": string (first 300 chars of matched record text)}], "count": integer (number of matches)}'
• Add result limit enforcement and document it: 'Returns up to 100 top-ranked matches sorted by relevance score (descending). Use record_index to fetch full details from your original data.'
• Improve error messages to include guidance: instead of 'records must be a list', return '{"status": "error", "error": "records parameter must be a list of dictionaries. Got: <type>. Example: [{"title": "...", "body": "..."}]"}'
• Consider renaming to 'search_products' or 'rank_products_by_query' to make the ranking/matching operation more explicit in the tool name.
• Add description of scoring algorithm in tool description: clarify that score = (number of query terms found in record) / (total number of unique query terms), providing the LLM visibility into relevance interpretation.
• Add parameter constraints: specify that query must be non-empty, records list must not be empty, and each record should contain at least one string value.