Summary
Vercel updated the Sandbox firewall to support forwarding selected HTTP requests to a proxy under customer control, along with matchers and credentials brokering for the requests that need it. The change gives teams finer control over outbound traffic from sandboxed execution.
What changed
Vercel added request proxying, filtering, and credentials brokering to the Sandbox firewall.
Why it matters
Sandboxed execution is becoming a core primitive for agentic workflows and AI-powered developer tools. Better outbound controls make those sandboxes easier to govern in enterprise settings and reduce the security tradeoff around code execution.
Evidence excerpt
Vercel says the Sandbox firewall now supports forwarding specific HTTP requests to a proxy you control, along with matchers for filtering and credentials brokering for selected requests.