Apr 23, 2026

The Composio SDKs add defense-in-depth for automatic file uploads (when a tool input is marked file_uploadable and the SDK reads a local path and sends the file to Composio storage). The goal is to reduce the risk of agent or app code accidentally exfiltrating secrets, SSH keys, or project env files that sit under well-known paths on disk.

URLs and File objects are not subject to the path-based denylist in the same way as string paths; the checks apply to resolved local filesystem paths used for auto-upload and the programmatic upload helpers that accept paths.

SDK versions

What changed

• Default sensitive path protection — Before reading and uploading, the SDK checks the resolved local path against a built-in list of path segments (for example .ssh, .aws, .claude, .kube) and file-name patterns (for example .env, default SSH private key names, credentials). If the path matches, the upload is refused unless you change configuration.
• Extra denylist segments — You can add path component names to merge with the built-in list (for example a proprietary secrets directory name).
• beforeFileUpload / before_file_upload hook — Optional hook for each file upload: return a different path, return false to abort, or throw. TypeScript: pass beforeFileUpload on the third argument to tools.execute. Python: use @before_file_upload in the modifiers list (same as other Python modifiers), not a separate keyword. Use this to enforce app-specific policies, audit logging, or copy-on-write to a safe temp file before upload. See Before file upload (Python).
• New errors — ComposioSensitiveFilePathBlockedError / SensitiveFilePathBlockedError when a path is blocked, and ComposioFileUploadAbortedError / FileUploadAbortedError when the hook returns false or a hook throws in an aborting way.
• Python: modifier order — substitute_file_uploads runs before before_execute modifiers, matching TypeScript behavior (including Tool Router execute_meta).

Examples

Configure the client (defaults + extra denylist segments)

Keep the built-in blocklist enabled and add path component names (anywhere in the resolved path) that your app treats as secret:

import { Composio } from '@composio/core';

const composio = new Composio({
  apiKey: process.env.COMPOSIO_API_KEY!,
  sensitiveFileUploadProtection: true,
  fileUploadPathDenySegments: ['company-secrets', 'private-keys'],
});

from composio import Composio

composio = Composio(
    api_key="your_composio_key",
    sensitive_file_upload_protection=True,
    file_upload_path_deny_segments=("company-secrets", "private-keys"),
)

Run a hook before each automatic file read

Return a new path, return false / False to abort, or throw. TypeScript passes beforeFileUpload in the third argument to tools.execute. In Python, use @before_file_upload in modifiers:

import { Composio, type beforeFileUploadModifier } from '@composio/core';
import path from 'node:path';

const composio = new Composio({ apiKey: process.env.COMPOSIO_API_KEY! });

const beforeFileUpload: beforeFileUploadModifier = async ctx => {
  // e.g. log, rewrite path, or return false to block
  return ctx.path;
};

await composio.tools.execute(
  'GOOGLEDRIVE_UPLOAD_FILE',
  {
    userId: 'user-123',
    arguments: { file_to_upload: path.join(__dirname, 'document.pdf') },
    dangerouslySkipVersionCheck: true,
  },
  { beforeFileUpload },
);

import os

from composio import Composio, before_file_upload


@before_file_upload(tools=["GOOGLEDRIVE_UPLOAD_FILE"])
def before_upload(path: str, tool: str, toolkit: str) -> "str | bool":
    return path


composio = Composio()

composio.tools.execute(
    "GOOGLEDRIVE_UPLOAD_FILE",
    {"file_to_upload": os.path.join(os.getcwd(), "document.pdf")},
    user_id="user-123",
    modifiers=[before_upload],
)

Opting out

Set sensitiveFileUploadProtection: false (TypeScript) or sensitive_file_upload_protection=False (Python) only if you have a clear reason and accept the security tradeoff. Prefer copying files to a non-sensitive path or using the hook to gate uploads.

import { Composio } from '@composio/core';

const composio = new Composio({
  apiKey: process.env.COMPOSIO_API_KEY!,
  sensitiveFileUploadProtection: false,
});

from composio import Composio

composio = Composio(
    api_key="your_composio_key",
    sensitive_file_upload_protection=False,
)

Where to read more

• Executing tools: automatic file handling and security options — configuration and code patterns.
• TypeScript Composio client — related constructor options in the reference.
• TypeScript SDK (repository): ts/docs/advanced/auto-upload-download.md — extended guide with error types and edge cases.