This server has 6 tools with explicit schemas and descriptions visible in src/tools.py. However, significant quality issues prevent a higher score: (1) parameter descriptions are largely missing or minimal, most parameters lack context for LLM selection; (2) output schemas are not documented anywhere; (3) descriptions are short but adequate (mostly 20-60 chars, above the 20-char floor but below production baseline of 194 chars); (4) no error handling guidance visible; (5) no tool annotations or risk metadata exposed via the MCP protocol; (6) field-naming inconsistencies (e.g., customer_id vs customer) may force LLM reasoning. Tools are well-named with clear verbs (customer_create, payment_intent_create, refund_create), and schemas include type information, but parameter descriptions are sparse and output structures are completely undocumented. This is typical of a functional but not production-ready MCP server.

• Add comprehensive output schemas to each tool. E.g., customer_create should document: {customer_id: string, email: string, name: string, created_at: ISO8601, metadata: object}. This allows agents to chain calls (e.g., capture customer_id, pass to customer_update).
• Expand parameter descriptions to 50-100 chars each. For 'currency', write: 'ISO 4217 currency code (e.g., usd, eur). Defaults to usd.' For 'customer_id', write: 'Stripe customer identifier (e.g., cus_Abc123). Required to fetch or update a customer.'
• Expand tool descriptions to 100-150 chars. Current descriptions are under 50 chars. Include WHEN to use the tool and what data it returns. E.g., 'Create a new customer record in Stripe with email and optional metadata. Returns customer_id for use in payment operations.'
• Constrain update_fields in customer_update. Instead of accepting arbitrary object, either enumerate allowed fields {email, name, metadata} with types and descriptions, or split into customer_update_email, customer_update_name, etc.
• Add a search_customers tool accepting name or email, returning a list of matching customers with customer_id, email, name, and created_at. This enables agents to resolve human-friendly identifiers to system IDs without manual lookup loops.
• Document pagination for charge_list. Add: 'Returns up to limit charges (max 100). For large result sets, make multiple calls with increasing offset or last_charge_id. Total charge count not provided; stop when returned set is smaller than limit.'

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry