This MCP server exposes a single tool 'get_public_ip_info' with critical definition quality gaps. The tool has a description in Chinese (获取当前主机公网 IP 地址及相关信息，自动处理 API 错误和限流), but the input schema is completely empty ({}), meaning it accepts no parameters. While the tool name follows verb-noun convention ('get_public_ip_info'), the schema definition is absent entirely per the hard scoring rule. The server returns structured output (IP, network, city, region, country, latitude, longitude) but does not document this output schema in the tool definition. Error handling returns labeled fields (error, message, reason, status) but lacks guidance for the LLM on recovery actions. The tool is genuinely read-only and stateless, but parameter descriptions are moot since no parameters exist.

• Add English translation of tool description. Current: '获取当前主机公网 IP 地址及相关信息，自动处理 API 错误和限流'. Better: 'Fetch the public IP address and geolocation information (city, region, country, coordinates) for the current host. Handles rate-limiting and API errors automatically.' (~130 chars, within 10-1024 baseline).
• Document output schema explicitly. Example: Define an output schema object with fields {ip: string, network?: string, version?: string, city?: string, region?: string, country?: string, latitude?: number, longitude?: number}. This enables LLM planning.
• Enhance error messages with recovery guidance. Instead of returning bare error objects, include actionable next steps: 'Rate limited by ipapi.co (HTTP 429). Wait 60 seconds and retry.' or 'ipapi.co unreachable (HTTP 503). Fall back to alternative IP service or try again in 5 minutes.'
• Add tool annotations: set readOnlyHint to true (tool does not mutate state) and idempotentHint to true (repeated calls with same context produce same result). This clarifies intent for LLM task planning.
• Implement exponential backoff for retryable errors (429, 503, 504) internally. Return a clear message indicating the LLM should retry later, rather than exposing raw HTTP status codes.
• Consider adding optional timeout_seconds parameter (with default ~10, max ~30) if the tool should support customizable request deadlines. Currently timeout is hardcoded and not tunable.