---
title: "Sandboxes of one user share /tmp/claude"
description: "On Linux, sandbox-runtime makes /tmp/claude writable in every sandbox a user starts, so agents that run side by side, each with its own filesystem grant, can read each other's temporary files."
url: "https://mko.run/notes/2026-10-05-sandbox-tmp/"
language: "en"
published: 2026-10-05
tags: ["sandbox", "linux", "upstream"]
---
# Sandboxes of one user share /tmp/claude

On Linux, sandbox-runtime makes `/tmp/claude` writable in every sandbox a user starts, so agents that run side by side, each with its own filesystem grant, can read each other's temporary files.