DonSeTch defines 4 tools with detailed parameter schemas and descriptions. Naming follows verb_noun convention (fetch, search, crawl, screenshot). Descriptions are substantive (100-300+ chars), explaining multi-tier escalation, intent classification, and crawl modes. However, output schemas are not documented, the source shows input parameters but no explicit return type definitions. Error handling guidance is absent; tools do not indicate what failures look like or how to recover. Parameter descriptions are strong but lack explicit constraints (e.g., tier values '1, 2, or 3' stated in description but not as enum). No tool annotations (readOnlyHint, destructiveHint) despite all being READ_ONLY. Overall solid parameter design but incomplete schema documentation and missing error recovery patterns.

• Document output schemas for all tools. Specify return types, field names, and structure. E.g., fetch returns {content: string, status: number, headers: object, ...}.
• Convert text-based constraints to formal schema enums. Change 'tier' description to enum: ['1', '2', '3'] and 'intent' to enum: ['web', 'code', 'paper', 'news', 'entity'].
• Add tool annotations: set readOnlyHint=true on all 4 tools to signal safety and enable agent retry logic.
• Document error scenarios and recovery paths. E.g., 'If fetch returns status 429 (rate limited), retry after deadline_ms. If status 404, URL may be invalid, try search() to find correct URL.'
• Clarify batch semantics for fetch and crawl. Specify: 'Returns array of results, one per input URL. If one URL fails, that result contains error details; others succeed independently.'