Single tool 'render' has a clear, concise description (95 chars) and explicit input schema with proper JSON Schema structure. However, critical gaps limit production readiness: (1) no output schema documented, LLMs cannot predict return structure; (2) parameter descriptions are minimal (align param lacks detail on valid values); (3) no error handling guidance, what happens with invalid rows or malformed objects?; (4) no parameter validation rules stated (e.g., max rows, max columns). The tool itself is well-named (verb_noun pattern) and the implementation is sound, but the definition lacks the rigor expected for A-grade tools.

• Add explicit output schema: { type: 'string', description: 'GitHub-flavored Markdown table with escaped pipes and trimmed cells' }
• Expand 'align' parameter description: 'Optional object mapping column names to alignment. Valid values: "left", "center", "right". Columns not in this map default to left-aligned. Invalid alignment values are ignored.'
• Add validation constraints to 'rows' description: 'Non-empty array of objects. Each object's values are converted to strings and pipe-escaped. Null/undefined values render as empty cells.'
• Clarify 'columns' behavior: 'If omitted, column order is the union of all keys across rows. If provided, only these columns appear in the table; missing keys render as empty cells.'
• Add error recovery guidance: 'If the tool fails, ensure rows is a non-empty array and each element is an object. Verify align keys match column names.'