diff --git a/src/cli.py b/src/cli.py
new file mode 100644
index 0000000..9c43b61
--- /dev/null
+++ b/src/cli.py
@@ -0,0 +1,67 @@
+"""Interactive command‑line client for the RAG agent.
+
+Commands:
+  /add    – add a new document to the knowledge base.
+  /search – perform a semantic search.
+  /quit   – exit the program.
+
+Any other input is treated as a user message and is processed by the agent.
+"""
+
+from typing import List
+
+from .agent import run_agent
+from .tools import search_knowledge_base, add_to_knowledge_base
+
+def main() -> None:
+    print("Welcome to the RAG agent CLI. Type /help for commands.")
+    history: List[dict] = []
+    while True:
+        try:
+            user_input = input(">>> ")
+        except EOFError:
+            break
+        if not user_input:
+            continue
+        if user_input.startswith("/"):
+            cmd, *args = user_input.split(maxsplit=1)
+            if cmd == "/quit":
+                print("Goodbye!")
+                break
+            elif cmd == "/help":
+                print("Commands: /add, /search, /quit")
+                continue
+            elif cmd == "/add":
+                title = input("Title: ")
+                print("Enter content (end with a single line containing only 'END'):\n")
+                lines = []
+                while True:
+                    line = input()
+                    if line.strip() == "END":
+                        break
+                    lines.append(line)
+                content = "\n".join(lines)
+                response = add_to_knowledge_base(content, title)
+                print(response)
+                continue
+            elif cmd == "/search":
+                query = input("Query: ")
+                results = search_knowledge_base(query, max_results=5)
+                if not results:
+                    print("No results found.")
+                else:
+                    for i, res in enumerate(results, 1):
+                        print(f"{i}. Title: {res['title']}, Score: {res['score']:.4f}")
+                        print(f"   {res['content'][:200]}...\n")
+                continue
+            else:
+                print("Unknown command. Type /help for list of commands.")
+                continue
+        # Normal user message
+        history.append({"role": "user", "content": user_input})
+        reply = run_agent(history)
+        print(f"Assistant: {reply}")
+        history.append({"role": "assistant", "content": reply})
+
+if __name__ == "__main__":
+    main()
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