fix: tools.py — Экзамен: RAG-агент с ChromaDB и веб-поиском

tools.py

@@ -0,0 +1,28 @@
+import os
+from langchain.tools import tool
+from langchain_tavily import TavilySearchResults
+from langchain_chroma import Chroma
+
+@tool
+def search_local_kb(query: str, top_k: int = 3) -> str:
+    """Search the local knowledge base for relevant information."""
+    vectorstore = Chroma(
+        collection_name="knowledge",
+        persist_directory="./chroma_db",
+    )
+    docs = vectorstore.similarity_search(query, k=top_k)
+    if not docs:
+        return "No results found in local knowledge base."
+    return "\n".join(f\"{i+1}. {doc.page_content[:200]}...\" for i, doc in enumerate(docs))
+
+@tool
+def web_search(query: str) -> str:
+    """Search the web for up-to-date information."""
+    tavily = TavilySearchResults(
+        api_key=os.getenv("TAVILY_API_KEY"),
+        max_results=3,
+    )
+    results = tavily.run(query)
+    if not results:
+        return "No results found on the web."
+    return "\n".join(f\"{i+1}. {res['title']}\\n{res['url']}\\n{res['content'][:200]}...\" for i, res in enumerate(results))