templates: Ionic Shopping Assistant (#16648)

- **Description:** This is a template for creating shopping assistant
chat bots
- **Issue:** Example for creating a shopping assistant with OpenAI Tools
Agent
- **Dependencies:** Ionic
https://github.com/ioniccommerce/ionic_langchain
  - **Twitter handle:** @ioniccommerce

---------

Co-authored-by: Erick Friis <erick@langchain.dev>

templates/shopping-assistant/shopping_assistant/agent.py

@@ -0,0 +1,47 @@
+from typing import List, Tuple
+
+from ionic_langchain.tool import IonicTool
+from langchain.agents import AgentExecutor, create_openai_tools_agent
+from langchain_core.messages import AIMessage, SystemMessage
+from langchain_core.prompts import (
+    ChatPromptTemplate,
+    HumanMessagePromptTemplate,
+    MessagesPlaceholder,
+)
+from langchain_core.pydantic_v1 import BaseModel, Field
+from langchain_openai import ChatOpenAI
+
+tools = [IonicTool().tool()]
+
+llm = ChatOpenAI(temperature=0.5, model_name="gpt-3.5-turbo-1106", streaming=True)
+
+# You can modify these!
+AI_CONTENT = """
+I should use the full pdp url that the tool provides me. 
+Always include query parameters
+"""
+SYSTEM_CONTENT = """
+You are a shopping assistant. 
+You help humans find the best product given their {input}. 
+"""
+messages = [
+    SystemMessage(content=SYSTEM_CONTENT),
+    HumanMessagePromptTemplate.from_template("{input}"),
+    AIMessage(content=AI_CONTENT),
+    MessagesPlaceholder(variable_name="agent_scratchpad"),
+]
+
+prompt = ChatPromptTemplate.from_messages(messages)
+agent = create_openai_tools_agent(llm, tools, prompt)
+
+
+class AgentInput(BaseModel):
+    input: str
+    chat_history: List[Tuple[str, str]] = Field(
+        ..., extra={"widget": {"type": "chat", "input": "input", "output": "output"}}
+    )
+
+
+agent_executor = AgentExecutor(agent=agent, tools=tools, verbose=True).with_types(
+    input_type=AgentInput
+)