MailGuard is a specialized security plugin for Gmail-origin session control. It defines 2 tools with partial schema visibility. Tool naming follows verb_noun conventions (policy_check, generate_report), but descriptions are minimal and lack actionable guidance. Parameter schemas are present but incomplete, missing type constraints, enums, and detailed descriptions. The generate_report tool lacks a documented output schema. Error handling is not visible in the provided code excerpt. Overall, this is a domain-specific tool set that addresses a real security need, but falls short of production-grade definition quality due to sparse documentation and incomplete schemas.

• Expand tool descriptions to 100-200 characters. For policy_check: 'Evaluates whether a requested tool or action is permitted under the current Gmail-origin session policy. Returns approval status and reason. Call this BEFORE attempting risky operations (send, delete, modify).'
• For generate_report, document output schema explicitly: 'Returns an object with fields: {sessionId (string), source (string: gmail|direct), riskScore (number 0-100), deniedTools (array of strings), pendingApprovals (array of {toolName, timestamp, reason}), report_generated_at (ISO 8601)}.'
• Convert generic 'parameters' object to either: (a) named properties with specific types (e.g. target_recipient, email_subject, attachment_count) with descriptions and constraints, or (b) document valid keys as an enum if parameters must remain flexible.
• Add parameter descriptions for 'action': 'The tool or action name to authorize, in snake_case format (e.g. send_email, delete_email, create_draft). Case-sensitive. Maximum 100 characters.'
• Add parameter description for 'includeApprovals': 'Whether to include pending approval requests in the report. Defaults to true. Set to false for a clean policy summary without pending actions.'
• Add error handling to responses: on sessionId not found, return 'Session "<id>" not found. Initialize with mailguard.initialize_session() first.' On invalid action name, return 'Invalid action: "<action>". Must match an action in the hardDeniedTools, approvalRequiredTools, or safeTols lists.'
• Document idempotency. policy_check is read-only and idempotent; generate_report is read-only but may return different results over time as approvals change. Include idempotentHint in tool annotations if adopting current spec.

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

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