Five tools with complete JSON Schema input definitions and detailed descriptions (avg 180 chars). All parameters are typed and described. Tool names use clear verb_noun patterns (check_, fetch_, compare_, validate_, explain_). Schemas include proper constraints (enums for 'source' parameter). Output structures are well-defined via Rust serde types. No security issues detected (all READ_ONLY, no secrets in params). Main gaps: no error handling guidance in descriptions, no pagination support documented, and output schemas not explicitly documented in tool descriptions for LLM consumption.

• Add explicit output schema documentation to each tool description. Example: 'Returns a LinkCheck object with fields: domain (string), url (string), hosting (Hosting), diagnostics (array), decision (string|null), explanation (string|null), services (array|null), apps (array of AppVerdict), notes (array).'
• Enhance error descriptions with recovery guidance. Example for fetch_association_file: 'If the domain is unreachable, verify it is a valid domain (not a URL or IP). If HTTP status is 404, the file may not exist at /.well-known/apple-app-site-association.'
• Add readOnlyHint: true to all tool schemas to explicitly signal to LLMs that these tools are safe to call without side effects and can be retried.
• Document domain format constraints more precisely: 'Must be a bare domain (e.g., example.com), not a URL (https://example.com), not an IP address, and must be a valid DNS name.'
• Consider adding a batch variant or pagination support if tools are expected to process multiple domains in sequence. Document limits on result sizes (e.g., max 100 apps per file).