AniList MCP has well-structured tool definitions with clear naming (search_anime, get_anime, trending_anime) and complete input schemas. All three tools have descriptions (194 - 234 chars, within baseline 34 - 392 range) and typed parameters. However, output schemas are not documented, LLMs cannot predict response structure. Parameter descriptions lack constraints (e.g., limit 1 - 25 is stated in description but not enforced in schema). Error handling is minimal; no recovery guidance or actionable error messages. No tool annotations (readOnlyHint, idempotentHint). Composition is sound: each tool has one responsibility, and search_anime returns results that could chain to get_anime via ID.

• Document output schema for each tool. Example: search_anime returns {count: number, results: [{id, title_romaji, title_english, title_native, description, episodes, duration_minutes, status, format, source, season, season_year, average_score, mean_score, popularity, favourites, genres, cover_image, site_url, studios}]}.
• Add minimum/maximum constraints to JSON Schema for limit parameters: {type: 'number', minimum: 1, maximum: 25, default: 10}.
• Wrap API calls in try-catch with actionable error messages. Example: 'AniList API unavailable (status 503). Retry in 30 seconds.' or 'Invalid anime ID. Try search_anime() to find the correct ID.'
• Add tool annotations to tool definitions: readOnlyHint: true and idempotentHint: true for all three tools, signaling to agents that these are safe to retry.
• Align description field names with response field names. Change search_anime description from 'synopsis' to 'description' to match formatMedia() output.