Single tool 'execute_skill_action' has a minimal description (89 chars, below 194-char baseline) that lacks WHAT, WHEN, and actionable context. Input schema is present but parameter 'query_payload' has only a generic description ('Input execution payload for this skill') with no format, constraints, or examples. No output schema is documented, the tool returns a hardcoded JSON string with no field descriptions. No error handling guidance, no idempotency declaration, no security context. The tool name 'execute_skill_action' is vague (does not start with a clear verb like 'run_', 'invoke_', or 'execute_guardrail_'); 'action' is ambiguous. No parameter validation, no recovery guidance. This is a stub implementation masquerading as a production tool.

• Expand tool description to 150 - 250 chars. Example: 'Evaluate a delegated agentic checkout guardrail. Accepts a JSON payload with merchant_domain, purchase_amount_usd, and max_budget_usd. Returns guardrail_verdict (APPROVED_FOR_SETTLEMENT or REJECTED_VELOCITY_OVERFLOW), remaining_velocity_budget_usd, and audit_receipt_url. Use this to verify purchase eligibility before settlement.'
• Rename tool to 'evaluate_checkout_guardrail' to match the actual domain (checkout guardrail evaluation) and start with a clear verb.
• Replace 'query_payload' parameter with explicit, typed parameters: merchant_domain (string, required), purchase_amount_usd (number, required, >0), max_budget_usd (number, required, >0). Add descriptions for each.
• Document the output schema with field types and descriptions: {status: string, message: string, guardrail_id: string, guardrail_verdict: enum[APPROVED_FOR_SETTLEMENT, REJECTED_VELOCITY_OVERFLOW], remaining_velocity_budget_usd: number, audit_receipt_url: string}.
• Add error handling: return distinct error responses for invalid inputs (e.g., 'purchase_amount_usd must be > 0'), missing parameters, and service failures. Include recovery guidance (e.g., 'Check that max_budget_usd >= purchase_amount_usd').