Twitch MCP has 12 tools with consistent naming (verb_noun pattern: get-, create-, update-, send-, search-) and complete input schemas using Zod. However, descriptions are generic and lack LLM-optimization guidance. Most tool descriptions are 30-60 chars, below the 50-200 char baseline for A+ tools. Parameter descriptions exist but are minimal (e.g., 'The ID of the broadcaster' without context on when/why to use). Output schemas are not documented, responses are formatted as text blobs rather than structured objects, forcing LLMs to parse unstructured output. Error handling is minimal (generic 'Failed to retrieve' messages). No tool annotations (readOnlyHint/destructiveHint) despite clear WRITE vs READ_ONLY risk levels. Missing idempotency guidance for write operations.

• Add tool annotations: mark update-channel, send-chat-message, create-poll, end-poll with destructiveHint=true; mark all read tools with readOnlyHint=true.
• Expand tool descriptions to 80-150 chars. E.g., 'Get current authenticated user info (name, ID, email). Call after authenticate() succeeds. Returns user profile with broadcaster status.'
• Document output schemas as structured objects. E.g., get-user returns {user_id, login, display_name, created_at, is_broadcaster}. Include these in tool description or a separate schema field.
• Enhance error messages with recovery guidance. E.g., 'User login not found. Try search_channels(query=partial_name) to find similar channels.' or 'Invalid broadcaster_id format, must be numeric Twitch ID.'
• Add parameter constraints in descriptions. E.g., 'broadcaster_id: numeric Twitch broadcaster ID (e.g., 123456789)' and 'tags: array of 1-10 strings, max 25 chars each'.