GuildBridge demonstrates solid tool definition quality with consistent naming patterns, complete parameter schemas, and good descriptions. All 8 tools are properly registered with the MCP SDK using Zod schemas. Naming follows verb_noun convention (list_*, get_*, send_*, reply_*, search_*). Parameters are well-described with type constraints (enums for channel types, numeric bounds for limits). However, there are gaps in output schema documentation (responses are JSON stringified text, not structured objects), and error handling lacks recovery guidance. The server implements permission checks and audit logging, which are strong security practices. Most tools follow single-responsibility principle, though some descriptions could be more prescriptive about when to use them vs similar tools.

• Convert all tool responses from JSON-stringified text to structured MCP response objects with typed fields. For example, list_guilds should return {guilds: [{id, name, icon}]}, list_channels should return {channels: [{id, name, type}]}, etc. This eliminates LLM parsing overhead.
• Document explicit output schemas for each tool. Add a 'Returns' or 'Response' field to each tool description stating the field names, types, and meanings. Example: 'Returns: {id: string, name: string, icon: string | null}'.
• Add recovery guidance to all error messages. Instead of 'Access denied: you are not a member of guild <guildId>', return 'Access denied: you are not a member of guild <guildId>. Try list_guilds to see servers you can access, or contact your guild administrator.'
• Add tool annotation hints to send_message and reply_to_message: mark them with destructiveHint=true so LLMs avoid unintended posts. Mark all list_* and get_* with readOnlyHint=true.
• Convert sort_by parameter in search_messages to use a Zod enum: z.enum(['relevance', 'recent']).optional() instead of z.string(). This makes valid options machine-parseable.
• Make embed parameter behavior explicit: either require content XOR embed via a union type, or document clearly in description which takes precedence if both are provided.
• Enhance get_user description to list returned fields: 'Returns user profile including id, username, display name, avatar URL, and bot status.'
• Add pagination support to list_channels and search_messages. Currently search_messages has a limit param (good) but no offset/cursor for continuation. Add total_results or next_cursor to responses.