Configure cloud environments changedcloud-environments
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9999* Set a shared environment as the organization's [default environment](#the-default-environment) at [claude.ai/admin-settings/claude-code](https://claude.ai/admin-settings/claude-code).
100100* [Pin one to a channel](https://claude.com/docs/claude-tag/admins/troubleshooting#channel-sessions-use-the-wrong-environment-or-can%E2%80%99t-find-one) in the Claude Tag admin settings.
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102Shared environments add to members' selectors rather than replacing them.
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104102## Network access
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106104Each environment sets one network access level, which controls the outbound connections its sessions can make. The default level, **Trusted**, allows package registries and other [allowlisted domains](#default-allowed-domains); **Custom** takes your own domain list.
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395393* **Requires network access**: install commands need to reach package registries. If your environment uses **None** network access, these hooks fail. The [default allowlist](#default-allowed-domains) under **Trusted** covers npm, PyPI, RubyGems, and crates.io.
396394* **Proxy compatibility**: in Anthropic-hosted environments, all outbound traffic passes through a [security proxy](#security-proxy), and some package managers don't work correctly with it; Bun is a known example. In a [self-hosted environment](/docs/en/self-hosted-environments-deploy#default-deny-egress), outbound traffic goes through your own network boundary instead.
397395* **Adds startup latency**: hooks run each time a session starts or resumes, unlike setup scripts which benefit from [environment caching](#environment-caching). Keep install scripts fast by checking whether dependencies are already present before reinstalling.
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399To persist environment variables for subsequent Bash commands, write to the file at `$CLAUDE_ENV_FILE`. See [SessionStart hooks](/docs/en/hooks#sessionstart) for details.
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401397To customize the base image, use a setup script to install what you need on top of the [provided image](#installed-tools), or run your own image as a container alongside Claude with `docker compose`. Replacing the base image entirely isn't supported yet.
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