I am encountering a silent failure when calling the DROPBOX_READ_FILE tool from within the COMPOSIO_REMOTE_WORKBENCH Python sandbox. While the tool works perfectly when called from the general execution surface (returning a valid pre-signed S3 URL), it consistently fails when executed via run_composio_tool inside the Python workbench. The response indicates the tool was called, but it returns successful: false with an error field of None. Environment: • Tool: DROPBOX_READ_FILE • Execution Surface: COMPOSIO_REMOTE_WORKBENCH (Python Sandbox) • Behavior: "Silent Failure" (Success=False, Error=None) Code Example of Failure: We are attempting to implement a "Read-Modify-Write" loop to update a file in Dropbox. The following code fails at the first step: def main(): try: # This call fails inside COMPOSIO_REMOTE_WORKBENCH # Response is: {"successful": false, "error": None, ...} raw_read = run_composio_tool("DROPBOX_READ_FILE", {"path": "/Working/Ai Image Prompts.md"}) if not raw_read or not raw_read.get("successful"): print(f"Read failed: {raw_read.get('error')}") # Output: "Read failed: None" return # Logic that would follow if Read succeeded: s3_url = raw_read["data"]["content"]["s3url"] # ... fetch, modify, and upload using upload_local_file ... except Exception as e: print(f"Exception: {e}") Request: Can you help me understand why run_composio_tool("DROPBOX_READ_FILE", ...) is returning a null error response within the COMPOSIO_REMOTE_WORKBENCH environment?

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Here is the Log ID of the latest

DROPBOX_READ_FILE

attempt: log_3FoNPxDCceJT

Thanks for the Log ID, that helped. That call actually succeeded on our side: Dropbox returned the file and no error was recorded. The issue is how the result is read inside the workbench. There, run_composio_tool returns a tuple (result, error), and result has no successful field (it has data, error and log_id). So .get("successful") is always None, and your check reports a failure with error=None even when the read worked. Try this code:

py

result, error = run_composio_tool("DROPBOX_READ_FILE", {"path": "/Working/Ai Image [Prompts.md](http://Prompts.md)"})

if error:

print(f"Read failed: {error}") return

s3_url = result["data"]["content"]["s3url"]

If s3_url isn't at that path, print(result) once and send me the key names (not the contents), and I'll point you to the right field.