diff --git a/tools.py b/tools.py
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+++ b/tools.py
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+# tools.py
+import os
+import json
+from pathlib import Path
+from typing import List
+from langchain_core.messages import ToolMessage
+
+# Global in-memory file store
+_virtual_files = {}
+
+# Define the search tool (placeholder implementation)
+# In a real scenario, this would query an external search API
+# For demonstration, we return a static result
+
+def search(query: str) -> str:
+    """Simulate a web search and return a short result string."""
+    # For simplicity, just return a canned response
+    return f"Search result for '{query}': This is a placeholder summary."
+
+# Define the write_file tool
+
+def write_file(file_path: str, content: str) -> str:
+    """Write content to an in-memory virtual file.
+
+    Parameters
+    ----------
+    file_path: str
+        Path relative to the workspace root.
+    content: str
+        Text content to write.
+
+    Returns
+    -------
+    str
+        Confirmation message.
+    """
+    _virtual_files[file_path] = content
+    return f"File '{file_path}' written successfully."
+
+# Define the export_files tool
+
+def export_files(export_dir: str) -> str:
+    """Export all virtual files to the real filesystem.
+
+    Parameters
+    ----------
+    export_dir: str
+        Directory path where files should be created.
+
+    Returns
+    -------
+    str
+        Summary of exported files.
+    """
+    Path(export_dir).mkdir(parents=True, exist_ok=True)
+    exported = []
+    for file_path, content in _virtual_files.items():
+        full_path = Path(export_dir) / file_path
+        full_path.parent.mkdir(parents=True, exist_ok=True)
+        full_path.write_text(content, encoding="utf-8")
+        exported.append(str(full_path))
+    return f"Exported {len(exported)} files: {', '.join(exported)}"
+
+# Expose tool metadata for LangGraph
+search_tool = {
+    "name": "search",
+    "description": "Search the web for a query and return a short summary.",
+    "func": search,
+}
+
+write_file_tool = {
+    "name": "write_file",
+    "description": "Write content to a virtual file.",
+    "func": write_file,
+}
+
+export_files_tool = {
+    "name": "export_files",
+    "description": "Export all virtual files to the real filesystem.",
+    "func": export_files,
+}
+
+# List of tools for LangGraph
+TOOLS = [search_tool, write_file_tool, export_files_tool]