Sentinel MCP provides clear, safety-focused tool definitions with explicit allowlisting and rate limiting. All 7 tools have descriptions (avg ~80 chars) and input schemas with type definitions. However, schemas lack depth: no enums for constrained inputs (e.g., record_type, HTTP method), minimal parameter descriptions, and no documented output schemas. Error handling is present but generic. Tool names are action-verb based (get_, run_, echo_) and follow verb_noun convention. The server prioritizes security (input sanitization, allowlists, audit logging) over LLM-friendly composition. Missing: pagination guidance, output field documentation, and recovery hints in error messages.

• Add enum constraints to 'record_type' (A, AAAA, MX, TXT, NS, SOA, CNAME, etc.) and 'method' (GET, POST, HEAD, PUT, DELETE, PATCH) parameters. Replace free-form strings with JSON Schema enum arrays.
• Document output schemas for all tools. E.g., run_dig returns {"records": [{"type": string, "value": string}], "query_time_ms": int}. Include field types and meanings so LLMs can extract and chain results.
• Expand parameter descriptions to 50-100 chars with format guidance. E.g., 'headers: JSON object with HTTP header names (e.g., Content-Type, Authorization) and string values. Max 10 headers, max 256 chars per value.'
• Add recovery hints to error messages. E.g., 'Target not allowlisted. Update ALLOWED_TARGETS env var or contact admin.' instead of bare PermissionError.
• Declare idempotency and side effects. Add to run_curl description: 'POST/PUT/PATCH may modify remote state. Retries could cause duplicate operations. Consider idempotent keys or dry-run first.'

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

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