Create app.py

app.py

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+import streamlit as st
+from dotenv import load_dotenv
+import os
+from langchain.chat_models import ChatOpenAI
+from langchain.agents import initialize_agent, Tool
+from langchain.agents import AgentType
+
+# Load API key from .env
+load_dotenv()
+api_key = os.getenv("OPENAI_API_KEY")
+
+# Streamlit UI
+st.set_page_config(page_title="🤖 Agentic AI Assistant", layout="wide")
+st.title("🤖 Agentic AI Application")
+st.write("Ask me anything or give me a task — I can reason and use tools!")
+
+# Create input box
+user_query = st.text_input("🧩 Your question or task:", placeholder="e.g., Calculate 45 * 23, or summarize a topic...")
+
+# Setup AI agent
+if api_key:
+    llm = ChatOpenAI(openai_api_key=api_key, model="gpt-4o-mini", temperature=0)
+
+    # Define tools
+    tools = [
+        Tool(
+            name="Calculator",
+            func=lambda x: str(eval(x)),
+            description="Useful for solving math problems."
+        ),
+    ]
+
+    agent = initialize_agent(
+        tools=tools,
+        llm=llm,
+        agent_type=AgentType.ZERO_SHOT_REACT_DESCRIPTION,
+        verbose=True
+    )
+
+    # Run agent on user query
+    if st.button("🚀 Run Agent") and user_query:
+        with st.spinner("🤔 Thinking..."):
+            result = agent.run(user_query)
+            st.success(result)
+
+else:
+    st.error("❌ Missing OpenAI API key. Please add it to your .env file.")