X-MCP provides 10 Twitter tools with consistent Zod schema definitions and basic descriptions. All tools have input schemas and descriptions present. However, descriptions are generic (avg ~60 chars, well below the 194-char baseline for A+ tools) and lack actionable context for LLM selection. Parameter descriptions are minimal or absent. No output schemas documented. Error handling is absent, no recovery guidance, retryability classification, or actionable error messages. Tool composition is reasonable (single responsibility), but descriptions do not explain WHEN to use each tool vs. alternatives (e.g., search_tweets vs. get_user_tweets). No pagination guidance despite tools returning lists. Security: credentials injected via environment variables (correct), but no audit logging or permission gates visible.

• Expand tool descriptions to 100 - 200 chars. Include WHEN to use (e.g., 'Use search_tweets to find tweets by keyword. Use get_user_tweets to retrieve a specific user's recent posts.'). Reference pattern:tool-description.
• Document output schemas for all tools. Specify fields returned (e.g., post_tweet returns {tweet_id, text, created_at, author_id}). Enable LLM tool chaining. Reference pattern:response-shaper.
• Add error handling with recovery guidance. E.g., 'User not found. Try search_users() with a partial name.' Classify errors as retryable vs. fatal. Reference pattern:recovery-guide.
• Add pagination constraints to list tools. Document maxResults range (e.g., 1 - 100, default 20). Return total_count or next_cursor. Reference pattern:paginated-result.
• Add tool annotations (destructiveHint, idempotentHint) to post_tweet, like_tweet, retweet, reply_to_tweet. Consider dry-run parameter for post_tweet. Reference pattern:tool-annotations.