diff --git a/cli.py b/cli.py
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--- /dev/null
+++ b/cli.py
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+"""Interactive CLI for the RAG agent.
+
+The CLI supports the following commands:
+
+* ``/add <dir>`` – Load all .txt/.md files from *dir* into Qdrant.
+* ``/search <query>`` – Run the agent on *query* and print the answer.
+* ``/quit`` – Exit the program.
+
+The vector store is created on first use and persisted in
+``./qdrant_db``.
+"""
+
+import os
+from pathlib import Path
+
+# Load environment variables (e.g., TAVILY_API_KEY)
+from dotenv import load_dotenv
+load_dotenv()
+
+# Local modules
+from .vector_store import create_vectorstore, load_documents
+from .agent import create_agent
+from . import tools
+
+# ---------------------------------------------------------------------------
+# Global state
+# ---------------------------------------------------------------------------
+VECTORSTORE = None
+AGENT = None
+
+# ---------------------------------------------------------------------------
+# Helper functions
+# ---------------------------------------------------------------------------
+
+def init_vectorstore() -> None:
+    global VECTORSTORE
+    if VECTORSTORE is None:
+        VECTORSTORE = create_vectorstore()
+        # Expose the store to the tools module so that the decorated
+        # functions can access it via the global name ``vectorstore``.
+        tools.vectorstore = VECTORSTORE
+
+def init_agent() -> None:
+    global AGENT
+    if AGENT is None:
+        AGENT = create_agent()
+
+def add_documents(directory: str) -> None:
+    init_vectorstore()
+    load_documents(directory, VECTORSTORE)
+
+def run_query(query: str) -> None:
+    init_agent()
+    # The agent expects a dictionary with the key ``input``.
+    result = AGENT.invoke({"input": query})
+    print("\nAnswer:\n", result)
+
+# ---------------------------------------------------------------------------
+# CLI loop
+# ---------------------------------------------------------------------------
+
+def main() -> None:
+    print("RAG Agent CLI.  Type '/quit' to exit.")
+    while True:
+        try:
+            line = input("> ")
+        except (EOFError, KeyboardInterrupt):
+            print("\nBye!")
+            break
+        if not line:
+            continue
+        if line.strip() == "/quit":
+            print("Bye!")
+            break
+        if line.startswith("/add "):
+            _, dir_path = line.split(" ", 1)
+            dir_path = dir_path.strip()
+            if not os.path.isdir(dir_path):
+                print(f"{dir_path} is not a directory.")
+                continue
+            add_documents(dir_path)
+            print("Documents added.")
+        elif line.startswith("/search "):
+            _, query = line.split(" ", 1)
+            run_query(query.strip())
+        else:
+            print("Unknown command. Use /add, /search, or /quit.")
+
+if __name__ == "__main__":
+    main()
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