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Public story · 2026-07-31 · high
Each agent gets its own Linux user and home directory, cutting the cost of spinning up one sandbox per agent.
Why now: The change is dated July 31 in Vercel's changelog, the day it's covered here.
Vercel now lets multiple agents share one Sandbox instance instead of spinning up a separate sandbox for each one, per the company's changelog. The @vercel/sandbox SDK adds support for multiple Linux users and groups. Each agent gets its own user account and a private home directory instead of one shared filesystem.
That kills a real cost for multi-agent pipelines built on Vercel. Isolating agents by filesystem used to mean paying for a full sandbox per agent, even for lightweight work.
Consolidating into one sandbox cuts both the compute cost and the cold-start delay of spinning up several instances at once.
The isolation isn't total by design. Vercel added a shared group alongside the per-agent users, so agents can pass files to each other on purpose. That's the right call for pipelines where one agent's output feeds directly into the next step.
It surfaced in coverage dated July 31, logged as a changelog entry on Vercel's site.
The isolation is Linux users and groups sharing one kernel, not separate virtual machines. That's a fine tradeoff for agents you control, less so for code you don't trust running in the same sandbox.
Each link below shares sources, entities, or timing with this story.
Claude Code supports Linux / Shared entity: Vercel Sandbox / Shared topic / Earlier coverage
Linked by a graph relationship (Claude Code supports Linux); both cover Vercel Sandbox; overlapping topics (agent, directory).
JAI uses Linux / Shared entity: Linux / Shared topic / Earlier coverage
Linked by a graph relationship (JAI uses Linux); both cover Linux; overlapping topics (agent, directory).
Shared entities / Shared topic / Earlier coverage
Both cover Direct, Linux, Vercel Sandbox; overlapping topics (agent, direct, isolated); earlier Direct coverage from 2026-03-14.
Vercel released Vercel Sandbox / Shared entity: Vercel Sandbox / Same source domain / Shared topic / Earlier coverage
Linked by a graph relationship (Vercel released Vercel Sandbox); both cover Vercel Sandbox; reported by the same outlet (vercel.com).
Linked by a graph relationship (Vercel released Vercel Sandbox); both cover Vercel Sandbox; reported by the same outlet (vercel.com).
Together AI uses Linux
Linked by a graph relationship (Together AI uses Linux).
Claude Code supports Linux / Shared entity: SDK / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Claude Code supports Linux); both cover SDK; overlapping topics (agent, direct).
Claude Code supports Linux / Shared topic
Linked by a graph relationship (Claude Code supports Linux); overlapping topics (agent, directory, each, filesystem, isolation).