This boilerplate demonstrates basic tool structure with 6 tools, all with descriptions and input schemas. However, definitions lack depth and specificity. Tool names are generic (add, calculate) without clear verb-noun patterns. Descriptions are minimal (10-50 chars) and lack context on when to use each tool or what distinguishes them. Parameter descriptions exist but are sparse. No output schemas documented. Error handling is absent from visible code. The payment-gated tools (onetime_add, subscription_add, metered_add) are poorly differentiated, their descriptions don't explain the business logic or when an agent should choose one over another. This is a boilerplate, not production-grade.

• Rename tools to follow verb_noun pattern: 'add_numbers', 'calculate_numbers', 'check_payment_status'. Move billing model to a parameter, not the tool name. This reduces cognitive load and makes tool selection clearer.
• Expand descriptions to 100-200 chars. Include WHAT the tool does, WHEN to use it (e.g., 'Use this after checking payment status to ensure the user has an active subscription'), and WHAT it returns. Example: 'Adds two numbers together. Requires an active subscription. Returns {result: number, timestamp: ISO8601}.'
• Document output schemas for all tools. Specify return type (number, object, array), required fields, and field types. This enables agents to chain tools and extract data reliably.
• Add error handling examples in tool descriptions. E.g., 'If user lacks subscription, returns {error: 'subscription_required', recovery: 'Call check_payment_status first'}'. This guides agent recovery.
• For check_payment_history, document the input context (how does it identify the user?) and output structure (list of subscriptions? boolean active flag?). If it uses the logged-in user's Stripe ID from OAuth context, state that explicitly.