Herdr Provides Vercel Sandbox for All Agents

The Herdr plugin runs terminal coding agents such as Claude Code, Codex, and OpenCode in isolated Vercel Sandbox environments. It uploads project files to a new Sandbox, installs the agent, and allows you to proceed with tasks through side-by-side panes similar to tmux.

Actions executed or modified by the agents do not directly affect the local machine. Multiple agents can run simultaneously, and the work performed in each pane is returned as JSON, enabling control from scripts or other agents.

Key safety features include:

• Displaying all files to be transmitted before the initial upload.
• Returning remote changes as a Git patch for the user to apply selectively.
• Requiring manual input of DELETE to permanently remove a Sandbox.

Claude Code 2.1.220, Codex 0.146.0, and OpenCode 1.18.9 are supported by default. Install the plugin using herdr plugin install vercel-labs/herdr-vercel-sandbox-plugin, run vercel link in the repository you want to work on, and then start the agent from Herdr's action menu.

Agent startup occurs in two calls. The first is a dry run showing the files to be uploaded, and the second call creates the Sandbox and opens the pane. Work results can be brought back to the local environment as a Git patch via the apply action, and standard Vercel Sandbox fees apply to usage.