RAWG MCP has clear, well-structured tool definitions with good naming conventions (all start with action verbs: search_, get_, list_). Descriptions are present and reasonably detailed (avg ~150 chars). Input schemas are properly typed with JSON Schema. However, critical gaps exist: (1) output schemas are NOT documented, LLMs cannot predict response structure; (2) parameter descriptions contain example values (e.g., 'e.g. "elden ring", "mario"') which LLMs tend to reuse literally; (3) no error handling guidance, rawgGet returns {error, message} but tools don't document recovery paths; (4) _apiKey parameter exposed in tool inputs violates secret-injection pattern; (5) no pagination guidance despite search_games returning potentially large result sets. search_games lacks 'required' array, making query optional when it should be required.

• Add explicit output schema documentation to each tool. E.g., search_games returns {count: number, games: [{id, slug, name, released, rating, metacritic, platforms: string[], genres: string[], background_image}]}. This enables LLMs to plan downstream calls and extract fields correctly.
• Remove _apiKey from tool parameters. Inject the API key server-side via environment variable or gateway configuration. If per-user keys are needed, use a separate authentication mechanism (e.g., OAuth token in request headers), not tool parameters.
• Replace example values in descriptions with formal constraints. E.g., instead of 'e.g. "action", "role-playing-games-rpg"', add an enum or link to RAWG's genre list. For ordering, define enum: ["-rating", "-released", "-metacritic", "rating", "released", "metacritic"].
• Add error handling guidance to tool descriptions. E.g., 'If the API returns 401, the RAWG key is invalid or expired. If 429, rate limit reached, retry after 60 seconds. If 404, the game ID does not exist, try search_games() first.'
• Mark search_games.query as required in inputSchema.required array. Add pagination guidance: 'Results are limited to page_size (max 40). Use multiple calls with different page offsets if needed.' Document the response structure inline or via a separate schema reference.