Server has 8 tools with basic schemas and descriptions, but significant quality gaps. All tools have descriptions (10-80 chars, mostly under 100), which is positive. However, parameter descriptions are minimal or missing context. Input schemas are present but lack detail: no enums for constrained values (e.g., staff_role, transfer_window, debut_type), no min/max for numeric params, no format specs. Output schemas are completely undocumented, tools return stringified R results or file paths, not structured data. Error handling is absent; execute_r_function() catches exceptions but returns raw tracebacks to the LLM. No guidance on retryability, user-fixable errors, or recovery paths. Tool names follow verb_noun pattern (good), but parameter naming is inconsistent: 'country_name' vs 'league_url', 'start_year' vs 'debut_start_year'. No pagination support despite tools returning lists. Security: R code is constructed via string interpolation, vulnerable to injection if user-controlled inputs are not sanitized.

• Add output schemas to all tools. Document the structure returned (e.g., 'Returns: {type: "list", items: [{url: string, team_name: string}], total: integer}'). Replace stringified results with structured JSON.
• Convert constrained parameters to enums. Define staff_role as enum: ['Manager', 'Assistant Manager', 'Goalkeeping Coach', 'Fitness Coach', 'Conditioning Coach']. Define transfer_window as enum: ['summer', 'winter', 'all']. Define debut_type as enum: ['league', 'pro'].
• Implement input sanitization. Escape quotes and special characters in R string parameters. Use parameterized R calls or a templating library to prevent injection.
• Add error classification. Return structured errors: {type: 'error', category: 'retryable|user_fixable|fatal', message: '<actionable message>', suggestion: '<recovery hint>'}. E.g., 'Invalid country: got "Englan", did you mean "England"?'
• Add pagination. Accept limit (default 20, max 100) and offset parameters. Return {items: [...], total: N, has_more: boolean, next_offset: N}. Document in tool descriptions.