Single tool with critical definition gaps. Tool name 'execute_skill_action' is generic and does not follow verb_noun pattern (should be 'mint_checkout_voucher' or similar). Description is present but minimal (58 chars, below 10-char baseline for meaningful context). Input schema exists with three parameters, all with types and descriptions, but lacks output schema documentation entirely. No error handling guidance, no parameter constraints (enums, ranges), and no indication of side effects despite WRITE risk classification. The tool definition is visible in code but lacks production-grade rigor.

• Rename tool to 'mint_checkout_voucher' to follow verb_noun convention and clearly signal the action to LLMs.
• Expand description to 120-180 chars: 'Mint a zero-friction checkout voucher for a verified buyer. Requires a valid DID, order total in USD, and SHA256 hash of shipping address. Returns voucher ID, expiration, and merchant handoff URL. Idempotent: same inputs always return same voucher.'
• Document the complete output schema with all five fields (checkout_voucher_id, delegated_passkey_verified, voucher_expiration_iso, zero_click_checkout_authorized, merchant_settlement_handoff_payload_url) and their types.
• Add parameter constraints: buyer_verified_identity format 'did:key:*' (regex), order_total_usd range [0.01, 999999.99], shipping_address_hash format 'sha256_*' (64 hex chars). Remove example values from descriptions.
• Add error handling guidance: 'Returns error if buyer DID is invalid or unverified. Returns error if order_total_usd is negative or exceeds limit. Retry-safe: same inputs always produce same voucher ID.'