Codex · macOS · Microsoft · OpenAI · OpenAI
The coding model may tell the harness to run commands locally
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To achieve this automatic constraint of writing files and accessing the network within safe bounds, Codex needs a sandbox environment that enforces these constraints.
Key facts
- For example, a current logged-in session might have a SID like S-1-5-5-X-Y
- Codex, their coding agent, runs on developer laptops—whether that's through the CLI, the IDE extension, or the desktop app
- On top of that, they prepended a small denybin directory to PATH and reordered PATHEXT so stub SSH and SCP scripts would resolve before the real binaries
- When the reporter joined the Codex engineering team in September 2025, Codex for Windows didn’t have a sandbox implementation meaning that Windows users were forced to choose between two subpar options
Summary
By David Wiesen, Member of Technical Staff. When the reporter joined the Codex engineering team in September 2025, Codex for Windows didn’t have a sandbox implementation meaning that Windows users were forced to choose between two subpar options when using OpenAI's coding agents:. Approving nearly every command (even reads) that a coding agent wanted to run, which is inefficient and pesky. Enabling Full Access mode: letting Codex run all commands without approval or restrictions, which removes friction at the expense of oversight. Codex , their coding agent, runs on developer laptops—whether that's through the CLI, the IDE extension, or the desktop app.