# The same order assistant in Spring AI and in LangChain4j, one question: "Where is ORD-1001?"

Spring AI : ChatClient.builder(model).defaultSystem(..).defaultTools(new SpringAiTools(orders))
LangChain4j: AiServices.builder(Support.class).chatModel(model).tools(new Lc4jTools(orders))

Spring AI answer    : Done: "Order ORD-1001: Status=SHIPPED, ETA=2026-10-14"
LangChain4j answer  : Done: Order ORD-1001: Status=SHIPPED, ETA=2026-10-14
HTTP requests sent  : Spring AI 2, LangChain4j 2.   Tool body executed: Spring AI 1, LangChain4j 1.

What differs on the wire (computed from the four bodies below):
  top-level fields   : Spring AI [messages, model, tools], LangChain4j [messages, model, stream, tools]
  tool schema        : Spring AI has $schema=true additionalProperties=true; LangChain4j has $schema=false additionalProperties=false
  tool result message: Spring AI sent "\"Order ORD-1001: Status=SHIPPED, ETA=2026-10-14\"", LangChain4j sent "Order ORD-1001: Status=SHIPPED, ETA=2026-10-14"

--- Spring AI, request 1
fields: [messages, model, tools]
  system: "You are a customer support agent. Use the tools for order questions. Be concise."
  user: "Where is ORD-1001?"
  tool getOrderStatus - Get current order status by order ID params {"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"orderId":{"type":"string","description":"The unique identifier of the order"}},"required":["orderId"],"additionalProperties":false}

--- Spring AI, request 2
fields: [messages, model, tools]
  system: "You are a customer support agent. Use the tools for order questions. Be concise."
  user: "Where is ORD-1001?"
  assistant: tool_call getOrderStatus {"orderId":"ORD-1001"}
  tool: ""Order ORD-1001: Status=SHIPPED, ETA=2026-10-14""
  tool getOrderStatus - Get current order status by order ID params {"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"orderId":{"type":"string","description":"The unique identifier of the order"}},"required":["orderId"],"additionalProperties":false}

--- LangChain4j, request 1
fields: [messages, model, stream, tools]
  system: "You are a customer support agent. Use the tools for order questions. Be concise."
  user: "Where is ORD-1001?"
  tool getOrderStatus - Get current order status by order ID params {"type":"object","properties":{"orderId":{"type":"string","description":"The unique identifier of the order"}},"required":["orderId"]}

--- LangChain4j, request 2
fields: [messages, model, stream, tools]
  system: "You are a customer support agent. Use the tools for order questions. Be concise."
  user: "Where is ORD-1001?"
  assistant: tool_call getOrderStatus {"orderId":"ORD-1001"}
  tool: "Order ORD-1001: Status=SHIPPED, ETA=2026-10-14"
  tool getOrderStatus - Get current order status by order ID params {"type":"object","properties":{"orderId":{"type":"string","description":"The unique identifier of the order"}},"required":["orderId"]}