Send PDF File as a ToolMessage

Product Help LangChain
1

I need to create a tool that retrieves a PDF and returns it to the LLM.

Configuration

  • LLM Provider: ChatBedrock
  • Model: Anthropic Claude Sonnet 3.5 v2
  • Agent Type: React Agent

Currently, my tool looks like this:

import base64
from langchain_core.tools import tool


@tool
def get_pdf():
    """
    Search on PDF information
    """
    pdf_path = "/sample/sample"

    with open(pdf_path, "rb") as pdf_file:
        pdf_data = base64.b64encode(pdf_file.read()).decode("utf-8")

    return [
        {
            "type": "file",
            "source_type": "base64",
            "data": pdf_data,
            "mime_type": "application/pdf",
        },
    ]

Problem

When running this, I get the following error:

{"error":"An error occurred (ValidationException) when calling the InvokeModel operation: Input is too long for requested model."}

This makes me think that toolMessage is passing the PDF as plain text instead of sending it as a proper file.