xProof provides a single, well-designed tool with comprehensive parameter documentation and clear governance semantics. The tool name 'xproof_certify' is action-oriented and unambiguous. Input schema is complete with type definitions for all 11 parameters. Descriptions are detailed (50-150 chars per parameter) and explain the 4W metadata model, confidence levels, and reversibility classes. However, the tool lacks explicit output schema documentation, error handling guidance, and security annotations. The implementation targets blockchain certification workflows where proof of decision-making is the core value, but agent-facing error recovery paths are not documented.

• Document the complete output schema: specify that xproof_certify returns an object with {transaction_hash: string, proof_id: string, timestamp: string, policy_status: 'passed'|'failed'} (or similar). Include whether additional metadata like gas_used, block_number, or policy_details are returned.
• Add explicit error classification and recovery paths. For PolicyViolationError, document which policy was violated (confidence too low? reversibility mismatch?) and suggest remediation: 'Confidence 0.62 below 0.95 required for irreversible. Either increase confidence via additional analysis or choose a reversible alternative.'
• Introduce a dry_run parameter (boolean, default false) to support confirmation-before-execute. When dry_run=true, validate the decision against governance policies without writing to blockchain, returning a report of what would happen.
• Add tool annotations to the tool descriptor: {"readOnly": false, "destructive": true, "idempotent": true} to signal that this tool has side effects but is safe to retry with the same inputs.
• Clarify the 'author' parameter default behavior: 'Defaults to the server-configured author value. If not configured and author is not provided, an error is raised.' This prevents silent identity loss.
• Document parameter constraints as formal rules in parameter descriptions: (1) Either decision_text or file_hash must be provided (both optional but not both omitted). (2) If reversibility_class='irreversible', confidence_level must be >= 0.95. (3) threshold_stage must be one of the defined enum values.