diff --git a/rag_tools.py b/rag_tools.py
new file mode 100644
index 0000000..045dece
--- /dev/null
+++ b/rag_tools.py
@@ -0,0 +1,41 @@
+from langchain.tools import tool
+from .vector_store import VectorStore
+from .splitter import chunk_text
+
+# Shared store instance
+_store: VectorStore | None = None
+
+@tool
+def add_to_knowledge_base(content: str, title: str = "Document") -> str:
+    """Add content to the knowledge base.
+
+    Parameters
+    ----------
+    content: str
+        Text content to add.
+    title: str
+        Optional title for the document.
+    """
+    global _store
+    if _store is None:
+        _store = VectorStore()
+    chunks = chunk_text(content)
+    _store.add_documents(chunks)
+    return f"Added {len(chunks)} chunks to the knowledge base under title '{title}'."
+
+@tool
+def search_knowledge_base(query: str, max_results: int = 5) -> list[tuple[str, float]]:
+    """Search the knowledge base for relevant chunks.
+
+    Parameters
+    ----------
+    query: str
+        Search query.
+    max_results: int
+        Number of top results to return.
+    """
+    global _store
+    if _store is None:
+        _store = VectorStore()
+    results = _store.search(query, max_results=max_results)
+    return results