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1919 The sandbox virtual machine runs the shell commands and model-written code of Cowork sessions and of the file-analysis steps in Chat. The agent loop, built-in file tools, web fetch, and the connector client run in the Claude Desktop application on the user's device and are governed by separate controls: per-action approval prompts, administrator-set per-tool policies, and the network egress allowlist applied when each tool runs. Code sessions also run outside the virtual machine, as described under [Code in Claude Desktop](#code-in-claude-desktop). For a deeper description of the layered controls inside and outside the virtual machine, see the security architecture overview available through the [Anthropic Trust Center](https://trust.anthropic.com).
2020 </Accordion>
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22 <Accordion title="What can the sandbox reach on the host?">
23 The sandbox sees the workspace folders the user has attached to the session, its own scratch area, and read-only reference material bundled by the application (such as skill and plugin directories). It does not see the rest of the user's filesystem. Claude's file-read and file-write tools are limited to those same locations and to the session's own working folder, and they cannot read or write the rest of the user's files unless the user adds another folder. In Cowork, Claude can ask the user to add a specific folder during the session, and the user approves or declines that request; see [Approvals and Auto mode](#approvals-and-auto-mode). Administrators can restrict which local folders users may attach with **Allowed workspace folders** on the [Config](/docs/government/config/settings#allowed-workspace-folders) page. The desktop client then refuses folders outside that list in the workspace picker, in requests Claude makes during a session, and in Claude's file tools. See [Desktop and filesystem access](/docs/third-party/claude-desktop/local-access) for how folder scoping is enforced.
22 <Accordion title="What can shell commands in the sandbox reach?">
23 Shell commands that Claude runs in the sandbox work on the folders the user has attached, a scratch area, and read-only reference material bundled by the application (such as skill and plugin directories). Shell commands cannot work on the rest of the user's files. Claude's file-read and file-write tools are limited to those same locations and to the session's own working folder, and they cannot read or write the rest of the user's files unless the user adds another folder. In Cowork, Claude can ask the user to add a specific folder during the session, and the user approves or declines that request; see [Approvals and Auto mode](#approvals-and-auto-mode). Administrators can restrict which local folders users may attach with **Allowed workspace folders** on the [Config](/docs/government/config/settings#allowed-workspace-folders) page. The desktop client then refuses folders outside that list in the workspace picker, in requests Claude makes during a session, and in Claude's file tools. See [Desktop and filesystem access](/docs/third-party/claude-desktop/local-access) for how folder scoping is enforced.
2424 </Accordion>
2525
2626 <Accordion title="How are attached folders made available to the sandbox?">
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6666 </Accordion>
6767
6868 <Accordion title="Which domains does Claude Desktop need to reach?">
69 For configuration and model inference, the application reaches the Claude for Government service hostname provided to your agency during onboarding. Sign-in happens in the user's default browser, which must reach that same hostname, the Claude for Government sign-in service (a separate host that your Anthropic representative provides), and your agency's identity provider. See the network prerequisites in [Connect Claude Desktop to Claude for Government](/docs/government/deploy-desktop/configure#before-you-begin). Claude for Government does not publish IP addresses for its service and sign-in hosts, so allow both by hostname on port 443. The [IP addresses](https://platform.claude.com/docs/en/api/ip-addresses) page in the Claude API documentation covers the Claude API, not the Claude for Government hosts. Anthropic-bound telemetry endpoints are not contacted in Claude for Government. Allow `downloads.claude.ai` for the sandbox virtual machine image and the Claude Code command-line tool, which are fetched at session start (not required if your agency uses the offline installer variant that bundles both), and `www.claudeusercontent.com` for the artifact preview frame. For automatic application updates, the required hosts depend on how your agency distributes the client; see the network-requirements table in [Telemetry and egress](/docs/third-party/claude-desktop/telemetry) and confirm the update hosts for your deployment before finalizing your allowlist.
69 For configuration and model inference, the application reaches the Claude for Government service hostname provided to your agency during onboarding. Sign-in happens in the user's default browser, which must reach that same hostname, the Claude for Government sign-in service (a separate host that your Anthropic representative provides), and your agency's identity provider. See the network prerequisites in [Connect Claude Desktop to Claude for Government](/docs/government/deploy-desktop/configure#before-you-begin). Claude for Government does not publish IP addresses for its service and sign-in hosts, so allow both by hostname on port 443. The [IP addresses](https://platform.claude.com/docs/en/api/ip-addresses) page in the Claude API documentation covers the Claude API, not the Claude for Government hosts. Anthropic-bound telemetry endpoints are not contacted in Claude for Government. Allow `downloads.claude.ai` for the agent helper that runs Chat, Cowork, and Code sessions and for the sandbox virtual machine image, which the app fetches at session start when it does not already have them (not required if your agency uses the offline installer variant that bundles both), and `www.claudeusercontent.com` for the artifact preview frame. For automatic application updates, the required hosts depend on how your agency distributes the client; see the network-requirements table in [Telemetry and egress](/docs/third-party/claude-desktop/telemetry) and confirm the update hosts for your deployment before finalizing your allowlist.
7070 </Accordion>
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7272 <Accordion title="Can administrators control when Claude Desktop updates?">
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7474 </Accordion>
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7676 <Accordion title="Does Claude for Government depend on claude.ai or anthropic.com?">
77 The core product does not. Configuration and model inference go through the dedicated Claude for Government service hostname, and sign-in goes through that hostname, the separate Claude for Government sign-in service, and your agency's identity provider, none of which are under either domain. Blocking `*.claude.ai` and `*.anthropic.com` leaves sign-in and inference working. Blocking `*.claude.ai` also blocks `downloads.claude.ai`, which prevents Cowork and Code sessions from starting and Advanced file analysis in Chat from running, unless the offline installer variant was used.
77 Sign-in, configuration, and model inference do not. Configuration and model inference go through the dedicated Claude for Government service hostname, and sign-in goes through that hostname, the separate Claude for Government sign-in service, and your agency's identity provider, none of which are under either domain. Blocking `*.claude.ai` and `*.anthropic.com` leaves sign-in and inference working. Blocking `*.claude.ai` also blocks `downloads.claude.ai`, which prevents Chat conversations, Cowork tasks, and Code sessions from starting on devices installed with the standard installer unless the app has already downloaded the components they need from that host. App updates often change one or both of those components, and the sandbox virtual machine that runs shell commands in Cowork and Advanced file analysis in Chat then cannot start until the app has downloaded the new versions from that host. Devices installed with the offline installer variant, which includes those components, are not affected. Automatic application updates use hosts under these domains, so an agency that blocks these domains distributes updates itself, as described under [Automatic updates](/docs/government/deploy-desktop/configure#automatic-updates).
7878 </Accordion>
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8080 <Accordion title="Does blocking claude.ai affect Claude for Government?">
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213213 Files that Claude saves in a working folder appear in the conversation as file cards that the user can open or show in Finder or File Explorer and copy from there. Code sessions work directly in the folder the user opened, as described under [Code in Claude Desktop](#code-in-claude-desktop).
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215 In Cowork, Claude's file tools change files in an attached folder in place, so the changes appear there immediately. A user who wants results in a particular folder attaches that folder to the task and asks Claude to save the files there. Shell commands run inside the sandbox virtual machine, and the only writable locations it shares with the device are the attached folders and the task's working folder. A file that a command writes anywhere else in the virtual machine, for example under `/tmp`, does not appear in any folder on the device.
215 In Cowork, Claude's file tools change files in an attached folder in place, so the changes appear there immediately. A user who wants results in a particular folder attaches that folder to the task and asks Claude to save the files there. Shell commands run inside the sandbox virtual machine, and on the device they can write only to the attached folders and the task's working folder. A file that a command writes anywhere else in the virtual machine, for example under `/tmp`, does not appear in any folder on the device.
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217217 By design, Chat cannot save files to other folders on the device. Claude's file tools in Chat, and the analysis steps that run in the sandbox when **Advanced file analysis in Chat** is on (the default), write only to the conversation's own working folder. For work that should end up in a particular folder, the user can run it as a Cowork task with that folder attached. See [Chat in Claude Desktop](/docs/third-party/claude-desktop/chat) for what a Chat conversation can reach, and [User identity and local data](/docs/third-party/claude-desktop/data-storage) for the folder layout.
218218 </Accordion>