Single tool 'execute_skill_action' has critical definition gaps. Description is generic (89 chars, below 10-char minimum for clarity) and does not explain WHAT the tool does, WHEN to use it, or what it returns. Input schema exists but parameter 'query_payload' lacks actionable description, it is a free-form string with no format guidance, constraints, or examples of valid payloads. No output schema is documented; the response is hardcoded JSON text, not structured. Tool name uses generic verb 'execute' rather than domain-specific action (e.g., 'optimize_warehouse_routing'). No error handling, no recovery guidance, no idempotency declaration. Naming does not reflect the actual domain (split shipment warehouse distance minimization).

• Rename tool to 'optimize_warehouse_routing' or 'minimize_split_shipment_distance' to clearly signal domain intent and help LLMs select the correct tool.
• Replace 'query_payload' with explicit, typed parameters: 'destination_zip' (string, format: /^\d{5}$/), 'order_skus' (array of strings), 'optimization_strategy' (enum: SINGLE_ORIGIN_OPTIMAL_HUB, MULTI_ORIGIN_COST_OPTIMIZED). Document each parameter's purpose and constraints.
• Expand tool description to 100-150 chars: 'Optimize warehouse routing for split shipments. Minimizes distance and cost by selecting the best origin warehouse(s) for a given destination and order SKUs. Returns routing plan with assigned warehouse, transit distance, and carrier cost.'
• Document output schema with typed fields: routing_plan_id (string), assigned_warehouse (string), transit_distance_miles (number), split_shipments_count (integer), estimated_carrier_cost_usd (number), carbon_emission_grams (number), manifest_dispatch_url (string). Include descriptions for each field.
• Add error handling: return structured errors for invalid ZIP codes, unknown SKUs, or no available warehouses. Include recovery guidance: 'Invalid ZIP code. Use format XXXXX (5 digits).' or 'SKU not found in inventory. Available SKUs: [...]'.