E2B tool - Improve description wuth uploaded files info (langchain-ai…

…#12355)

libs/langchain/langchain/tools/e2b_data_analysis/tool.py

@@ -11,7 +11,7 @@
     AsyncCallbackManagerForToolRun,
     CallbackManagerForToolRun,
 )
-from langchain.pydantic_v1 import BaseModel, Field
+from langchain.pydantic_v1 import BaseModel, Field, PrivateAttr
 from langchain.tools import BaseTool, Tool
 from langchain.tools.e2b_data_analysis.unparse import Unparser
 
@@ -97,7 +97,7 @@ class E2BDataAnalysisTool(BaseTool):
     name = "e2b_data_analysis"
     args_schema: Type[BaseModel] = E2BDataAnalysisToolArguments
     session: Any
-    uploaded_files: List[UploadedFile] = Field(default_factory=list)
+    _uploaded_files: List[UploadedFile] = PrivateAttr(default_factory=list)
 
     def __init__(
         self,
@@ -119,7 +119,8 @@ def __init__(
 
         # If no API key is provided, E2B will try to read it from the environment
         # variable E2B_API_KEY
-        session = DataAnalysis(
+        super().__init__(description=base_description, **kwargs)
+        self.session = DataAnalysis(
             api_key=api_key,
             cwd=cwd,
             env_vars=env_vars,
@@ -128,21 +129,19 @@ def __init__(
             on_exit=on_exit,
             on_artifact=on_artifact,
         )
-        super().__init__(session=session, description=base_description, **kwargs)
-        self.uploaded_files = []
 
     def close(self) -> None:
         """Close the cloud sandbox."""
-        self.uploaded_files = []
+        self._uploaded_files = []
         self.session.close()
 
     @property
     def uploaded_files_description(self) -> str:
-        if len(self.uploaded_files) == 0:
+        if len(self._uploaded_files) == 0:
             return ""
         lines = ["The following files available in the sandbox:"]
 
-        for f in self.uploaded_files:
+        for f in self._uploaded_files:
             if f.description == "":
                 lines.append(f"- path: `{f.remote_path}`")
             else:
@@ -206,15 +205,19 @@ def upload_file(self, file: IO, description: str) -> UploadedFile:
             remote_path=remote_path,
             description=description,
         )
-        self.uploaded_files.append(f)
+        self._uploaded_files.append(f)
+        self.description = self.description + "\n" + self.uploaded_files_description
         return f
 
     def remove_uploaded_file(self, uploaded_file: UploadedFile) -> None:
         """Remove uploaded file from the sandbox."""
         self.session.filesystem.remove(uploaded_file.remote_path)
-        self.uploaded_files = [
-            f for f in self.uploaded_files if f.remote_path != uploaded_file.remote_path
+        self._uploaded_files = [
+            f
+            for f in self._uploaded_files
+            if f.remote_path != uploaded_file.remote_path
         ]
+        self.description = self.description + "\n" + self.uploaded_files_description
 
     def as_tool(self) -> Tool:
         return Tool.from_function(