diff --git a/tools.py b/tools.py
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--- /dev/null
+++ b/tools.py
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+"""
+Agent tools for local KB search and web search via Tavily.
+"""
+
+from typing import List, Dict
+
+from langchain.agents import tool
+from langchain_tavily import TavilySearch
+from langchain.schema.document import Document
+
+# Local KB search tool
+@tool("search_local_kb")
+def search_local_kb(query: str, top_k: int = 3) -> List[Dict]:
+    """Semantic search in the local ChromaDB collection.
+
+    Returns a list of dicts with keys ``text`` and ``source``.
+    """
+    from vectorstore import create_vectorstore
+
+    # Assume the collection is already created and persisted
+    store = create_vectorstore()
+    results = store.query(query, top_k=top_k)
+    return [
+        {"text": doc.page_content, "source": doc.metadata.get("source", "unknown")}
+        for doc in results
+    ]
+
+# Web search tool using Tavily.
+@tool("web_search")
+def web_search(query: str) -> List[Dict]:
+    """Search the web with Tavily and return a list of result snippets.
+
+    Requires environment variable TAVILY_API_KEY.
+    """
+    tav = TavilySearch()
+    results = tav.search(query, max_results=5)
+    return [
+        {"text": r["title"] + ": " + r["snippet"] if isinstance(r, dict) else str(r)}
+        for r in
+        (results if isinstance(results, list) else [])
+    ]