IPInfo Geolocation demonstrates solid tool definition quality with comprehensive schemas, clear descriptions, and thoughtful parameter design. All 5 tools are explicitly registered with JSON Schema input definitions and meaningful descriptions (100-250 chars). Tool naming follows verb_noun convention (lookup, check, generate, summarize). Parameters include proper type constraints (enums, format:ip) and descriptions. Output schemas are documented in the source. Key strengths: batch operation support, enum constraints on detail levels, clear risk classifications. Main gap: tool annotations (readOnlyHint) are missing from definitions despite risk levels being declared in metadata. Error handling is present but recovery guidance could be more specific in descriptions. No security red flags, all tool parameters are user-supplied IPs or configuration flags; no credentials exposed.

• Add readOnlyHint: true to all tool definitions in FastMCP registration (@mcp.tool decorator) to surface risk classification in the protocol.
• Expand ipinfo_lookup_ips description to include recovery steps: 'If auth_insufficient_scope error occurs, the API token tier lacks /batch access, try looking up IPs individually with ipinfo_lookup_my_ip or upgrade to Core+ plan.'
• Add minItems and maxItems constraints to array parameters in schemas, or at minimum include bounds in parameter descriptions: 'ips (array, 1-1000 items)' and for map_url 'ips (array, up to 500,000)'.
• Document the output schema structure in ipinfo_summarize_ips description: 'Returns a SummaryResult with groups[] containing {dimension, values[{value, count, percentage}]}, use this to analyze IP distributions by country, continent, ASN, or privacy classification.'
• Add explicit parameter dependency note to ipinfo_summarize_ips: 'The detail parameter from ipinfo_lookup_ips is not available here, summarization always uses full server-side data regardless of plan tier.'