Sentinel MCP presents 15 tools with serious definition quality gaps. While tool names follow verb_noun conventions (authorize, trigger_kill_switch, resolve_approval, etc.) and descriptions exist, the definitions lack the rigor required for production agent use. Most tools have minimal parameter descriptions, fields like 'context' (tools 1, 2, 3, 11) are documented only as 'Additional context for the authorization decision' or 'Original authorization request to replay' without specifying structure, required keys, or format. No output schemas are documented anywhere in the provided code. Tools like `meta_protocols` and `meta_policy_bundle` have NO input schema visible and descriptions under 50 characters. Error handling guidance is absent, tools give no recovery hints or error categorization. Security-critical tools like `trigger_kill_switch` and `restore_kill_switch` lack rate-limiting hints or confirmation patterns. The server is HTTP-based (good for transport), but definition quality is well below production baseline (baseline avg 194 chars per tool description; these average ~80 chars, and many params are undescribed).

• Document output schemas for all 15 tools. Example: authorize should return {decision: string, reason?: string, evidence_id?: string}. Every response field must be described and typed.
• Expand tool descriptions from ~50 chars to 120-200 chars minimum. Include WHEN to use: 'Call authorize for generic access decisions, authorize_mcp for MCP-protocol-specific gates, authorize_a2a for service-to-service flows.' Add 'Returns:' section describing output fields.
• For 'context' parameter (tools 1, 2, 3, 11): define structure as JSON Schema object with documented properties (e.g., 'context: object with keys user_id (string), request_ip (string), timestamp (ISO8601 string)'). Or split into separate, named parameters.
• Add confirmation patterns to trigger_kill_switch and restore_kill_switch. Implement a dry_run parameter (bool, default false) or a separate preview tool that returns impact analysis before execution.
• Implement error handling with recovery guidance. Example: 'decision_id not found. Call list_decisions() to find valid IDs, then retry with the correct ID.' Categorize each error as retryable, user-fixable, or fatal.
• Add discovery tools: list_decisions(), list_approvals(), list_attestations() with pagination. These enable agents to find valid IDs before calling evidence, replay_decision, get_attestation.
• For request_approval: document ttl_seconds with typical range (e.g., '30-3600 seconds; 300 seconds = 5 minutes typical for high-risk decisions'). Explain what happens when TTL expires.