NestJS MCP framework provides decorator-based tool registration with TypeScript/Zod schema support. However, critical inspection reveals multiple definition quality issues: (1) Tool descriptions are often below 20 characters or lack clarity ('Dynamic prompt', 'Dynamic resource'). (2) Missing descriptions entirely for get_temperature. (3) Parameter descriptions present but tool-level intent is unclear. (4) No visible output schema documentation across all 6 tools despite inputSchema declarations. (5) Typos in descriptions ('sand' instead of 'send', 'fiendly' instead of 'friendly', 'teegram' instead of 'telegram') suggest lack of review. (6) Error handling patterns not visible in source. (7) Security patterns not evident, no permission gates or audit trails shown. The framework supports Zod schema validation, which is positive, but actual tool implementations show gaps in production-readiness patterns.

• Add comprehensive descriptions (50-200 characters) to all tools explaining WHAT they do, WHEN to use them, and any prerequisites. Example: 'Send a message to a Telegram user. Use when you need to notify a specific user (provide chatId) of information or request. Returns success status.'
• Document outputSchema for all tools using the same Zod pattern as inputSchema. Example: 'outputSchema = { success: z.boolean(), messageId: z.string() }'.
• Fix spelling/grammar errors: 'sand' → 'send', 'fiendly' → 'friendly', 'teegram' → 'telegram'.
• Provide explicit input schema for users.find tool. Specify parameters (filter field names, values, pagination) and types.
• Implement error handling with actionable guidance. Example: 'catch (e) { return { isError: true, messages: [{ type: 'text', text: 'Chat not found. Verify chatId is numeric and user exists.' }] }}'.
• Add per-tool audit logging showing who (agent/user ID), what (tool name), when (timestamp), and result. Use NestJS LoggerService with structured format.
• Declare tool permissions/scopes explicitly in IMcpTool interface. Example: 'scope = ["write:telegram"]'. Use @UseGuards(PermissionGuard) to enforce.
• For dynamic tools (dynamic_prompt, dynamic_resource, get_temperature), add parameter descriptions explaining what chatId/testId values are expected and how to discover valid IDs.
• Implement idempotency for telegram.sendMessage if possible (e.g., accept optional messageId to prevent duplicate sends on retry).
• Add tool annotations (readOnlyHint, destructiveHint) to indicate side effects. Example: '@McpTool() class ExampleTool { annotations = { destructiveHint: false } }'.