OSINT MCP server has moderate definition quality with mixed execution. All 11 tools have descriptions and input schemas present, but descriptions are formulaic and vary widely in actionability. Parameter documentation is inconsistent, most lack depth about constraints and expected formats. No output schemas are documented, making it unclear what fields agents should extract from responses. Error handling is minimal, tools return generic errors without recovery guidance. The tool set is well-composed (each does one thing) but naming could be more descriptive (e.g., 'get_ip_info' is vague about what 'info' includes). Security-wise, the server accepts API keys as environment variables (good), but tool descriptions don't clarify permission requirements or destructive vs. read-only boundaries. Overall, this is a C-grade server, serviceable but requiring significant documentation and error-handling improvements.

• Document output schemas for all 11 tools. E.g., dns_lookup should specify: Returns {records: [{type: string, value: string, ttl: int}], query_time_ms: int}. This allows LLMs to extract IPs, hostnames, or MX servers correctly.
• Rename 'get_ip_info' to 'get_ip_geolocation' to distinguish from 'check_ip_reputation'. Use consistent verb-noun pairings: all GET tools for read-only lookups, all CHECK tools for validation/threat assessment.
• Expand parameter descriptions to include constraints. E.g., domain parameter: 'Domain name (e.g., example.com). Must be valid DNS name (2-63 chars per label, alphanumeric + hyphens, no leading/trailing hyphens).'
• Add error recovery hints to tool descriptions. E.g., dns_lookup: 'If domain is not found, it may be invalid or offline. Suggest user verify spelling or try a known-good domain like google.com.'
• Clarify API key requirements for check_ip_reputation. Update description: 'Check IP reputation using VirusTotal API (requires VIRUSTOTAL_API_KEY environment variable). Returns threat score 0 - 100 and known malware associations.'
• Add pagination to domain_recon. If include_ct_logs=true returns >100 certs, return {certs: [...first 100...], has_more: true, next_cursor: '...'} to prevent context bloat.
• Implement input validation with actionable error messages. E.g., if domain is empty or too long, return: 'Invalid domain: must be 1-255 chars. Got: "" (empty string).'
• Add idempotent/read-only hints to all tools. Since all are marked READ_ONLY, confirm this in tool descriptions and ensure they log properly for audit trails.

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

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