NewAgent platforms
The fx adapter now runs the harness on the host
Our short summary of Vercel’s engineering write-up. The full story, with all the detail, is on their blog.
Read the full write-up on vercel.com (opens in a new tab)Problem
Setting up sandboxed tool execution was complex and kept credentials insecure.
Solution
Moved the harness to run in the host process with libfx, isolating filesystem tools, adding tool filtering, mid‑turn steering, structured output, and session resume.
Want the architecture, code and numbers? They’re in the original post.
Read the full write-up on vercel.com (opens in a new tab)
Fly.io
AWS