The server defines 4 tools with clear, action-verb names (get_coordinates, get_weather, get_place_info, get_currency_rate) and complete input schemas visible in the source. Descriptions are present and reasonably detailed (ranging 120 - 250 chars). However, several tools have minimal parameter descriptions, output schemas are not formally documented, and error handling lacks guidance for the LLM on recovery paths. No tool annotations (readOnlyHint, idempotentHint) are present. The tools are well-scoped and single-responsibility, which is a strength. Parameter constraints (ISO codes for currency) are documented in descriptions rather than enums, which weakens self-documentation.

• Document output schemas formally. Add a 'returns' section to each tool docstring specifying the dict structure and field types: get_coordinates returns {lat: float, lon: float, name: str, country: str, timezone: str}
• Expand parameter descriptions to include format, constraints, and error cases. For 'city', add: 'Name of the city (free-form text, e.g. "Paris", "New York"). Matches against geocoding database; ambiguous names return the top result. If no match found, an error is raised.'
• Add enum constraints or pattern validation for base_currency and target_currency. Either declare supported codes as an enum in the schema, or validate inside the tool and return a helpful error: 'Invalid currency code "XXX". Must be ISO 4217, e.g. USD, EUR, GBP, JPY'
• Document error cases and recovery guidance in tool descriptions. E.g., get_weather: 'If the city is not found, returns an error. Try with the official city name or a nearby major city.'
• Add tool annotations to the FastMCP registration if the framework supports it (e.g., @mcp.tool(readOnly=True) or a decorator). This signals to the LLM that these tools are safe to retry.
• For get_place_info, document the 404 fallback: 'If no Wikipedia article is found, returns {city, summary: "No Wikipedia article found.", url: ""}. The LLM should gracefully degrade to other tools for context.'
• Add input validation with actionable error messages. E.g., if get_currency_rate receives an invalid code, catch it and return: '{"error": "Invalid base_currency. Must be ISO 4217 code like USD, EUR, GBP. Received: XXX"}' instead of a raw httpx exception.