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quickstart changedmanaged-agents/quickstart

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374374 </Step>
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376376 <Step title="Create an environment">
377 An environment defines the sandbox where your agent runs. This one uses `limited` [networking](https://platform.claude.com/docs/en/managed-agents/environments#networking) with package managers allowed, so code running in the sandbox can reach public [package registries and code hosts](https://platform.claude.com/docs/en/managed-agents/environments#package-manager-hosts). Web search and web fetch run outside the sandbox, and this quickstart does not need them. With `limited` networking, the [`allowed_hosts` list](https://platform.claude.com/docs/en/managed-agents/environments#networking) applies to them too. They return no pages or search results in this environment, because it lists no hosts. For your own agent, list the hosts it needs in `allowed_hosts`.
377 An environment defines the sandbox where your agent runs. This one uses `limited` [networking](https://platform.claude.com/docs/en/managed-agents/environments#networking) with package managers allowed, so code running in the sandbox can reach public [package registries and code hosts](https://platform.claude.com/docs/en/managed-agents/environments#package-manager-hosts). Web search and web fetch run outside the sandbox, and this quickstart does not need them. With `limited` networking, the [`allowed_hosts` (java, php: `allowedHosts`; csharp, go: `AllowedHosts`) list](https://platform.claude.com/docs/en/managed-agents/environments#networking) applies to them too. They return no pages or search results in this environment, because it lists no hosts. For your own agent, list the hosts it needs in `allowed_hosts` (java, php: `allowedHosts`; csharp, go: `AllowedHosts`).
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379379 <CodeGroup defaultLanguage="CLI">
380380 <CodeGroupItem>
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