diff --git a/cli.py b/cli.py
new file mode 100644
index 0000000..9fa2872
--- /dev/null
+++ b/cli.py
@@ -0,0 +1,43 @@
+"""
+Command‑line interface for the RAG agent.
+
+Commands:
+  add <file>   – add document from file to knowledge base
+  search <q>   – search query in knowledge base
+  quit         – exit
+"""
+
+import argparse
+import asyncio
+from pathlib import Path
+from langchain_core.messages import HumanMessage
+from agent import agent
+
+async def run_cli():
+    parser = argparse.ArgumentParser(description="RAG Agent CLI")
+    subparsers = parser.add_subparsers(dest="cmd", required=True)
+
+    add_parser = subparsers.add_parser("add", help="Add document from file")
+    add_parser.add_argument("file", type=Path, help="Path to text file")
+
+    search_parser = subparsers.add_parser("search", help="Search query in knowledge base")
+    search_parser.add_argument("query", type=str, help="Search string")
+
+    args = parser.parse_args()
+
+    if args.cmd == "add":
+        content = args.file.read_text(encoding="utf-8")
+        title = args.file.stem
+        await agent.ainvoke(
+            {"messages": [HumanMessage(content=f"Add document: {title}")]},
+            {"configurable": {"thread_id": "cli-add"}},
+        )
+    elif args.cmd == "search":
+        result = await agent.ainvoke(
+            {"messages": [HumanMessage(content=args.query)]},
+            {"configurable": {"thread_id": "cli-search"}},
+        )
+        print(result["messages"][-1].content)
+
+if __name__ == "__main__":  # pragma: no cover
+    asyncio.run(run_cli())