The server defines 6 tools with explicit JSON schemas and basic descriptions. All tools follow verb-noun naming conventions and accept well-typed parameters with constraints (enums, min/max). However, parameter descriptions are entirely absent, none of the 6 tools provide descriptions for their input parameters. Tool descriptions themselves are brief but adequate (10-50 chars). Output schemas are not documented anywhere in the visible codebase. Error handling is not visible in the tool definitions. No tool annotations (readOnlyHint, destructiveHint, idempotentHint) are present. All tools are read-only (low risk), but this should be declared explicitly.

• Add descriptions to every input parameter. For example: 'updated_since: ISO 8601 datetime string (e.g., 2024-01-15T10:30:00Z). Return only accounts updated on or after this timestamp.' This guides LLMs to pass valid values.
• Document the output schema for each tool in a comment block or extended description. Specify the structure, field names, types, and any nested objects. E.g., 'Returns an array of objects with fields: { account_id: string, account_name: string, current_balance: number, currency: string }'.
• Add tool annotations to the Tool struct: readOnlyHint for all tools (since they are all safe, read-only queries). This aligns with current MCP spec patterns and signals intent to clients.
• Expand error handling in the handler layer (not visible but assumed present) to return recovery guidance. E.g., if account_id is invalid, return 'Account not found. Call get_accounts() to list available accounts.' instead of a generic 404.
• Clarify pagination support. If results can exceed a reasonable limit (e.g., 50 items), add offset/cursor and total_count to the response. Document in the tool description: 'Returns up to 50 results. Use offset to paginate through large result sets.'
• Add parameter constraints to descriptions. E.g., 'range: Time period (30d, 90d, or 1y). Defaults to 90d if omitted.' This prevents LLMs from hallucinating invalid values like '60d'.
• Consider grouping the two transaction tools (get_transactions + search_transactions) documentation to explain their difference: get_transactions is for time-bounded queries; search_transactions is for keyword-based discovery. Prevents LLM confusion.

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

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