Transistor MCP demonstrates solid tool definition quality with 23 well-named, action-verb-prefixed tools covering podcast hosting operations. All tools have descriptions (avg ~120 chars) and input schemas with typed parameters. Strengths: consistent naming (get_*, list_*, create_*, update_*, delete_*), enum constraints on status/type fields, pagination support (page/per params), and parameter descriptions. Weaknesses: output schemas are not documented in the tool definitions; error handling lacks recovery guidance; descriptions could be more prescriptive about when to use each tool vs. alternatives; some parameter descriptions are generic ('ID of the X'). No tool annotations (readOnlyHint, destructiveHint) despite clear risk levels. Response trimming logic (trimEpisodeResponse) exists but is not exposed to the LLM.

• Add output schema documentation to every tool definition. Include example response structure and field types. E.g., list_shows returns {data: [{id: string, attributes: {title: string, ...}}], meta: {pagination: {...}}}.
• Implement tool annotations: add readOnlyHint=true to all READ_ONLY tools (get_*, list_*), destructiveHint=true to delete_subscriber, and idempotentHint=true to tools that are safe to retry (all except publish_episode which changes state).
• Enhance error messages with recovery guidance. When a show_id is invalid, return 'Show not found. Available shows: [list top 5]. Call list_shows() to see all.' When a subscriber email is invalid, suggest 'Did you mean: [similar emails]?'.
• Clarify parameter dependencies in descriptions. For delete_subscriber, state: 'Either provide subscriber_id alone, OR provide both show_id and email (not both methods).' Add validation to reject ambiguous calls.
• Add per-tool usage hints in descriptions. E.g., list_episodes: 'Use this to discover episodes before calling get_episode or update_episode. Use fields param to reduce response size for large shows.' This guides LLM tool selection.