self-hosted-sandboxes-custom-tools changedmanaged-agents/self-hosted-sandboxes-custom-tools
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66 topic:
77 title: Managed Agents
88 url: https://platform.claude.com/docs/en/managed-agents/overview
9 status: beta
109 betaHeader: managed-agents-2026-04-01
10 zdr:
11 eligibility: not-eligible
12 note: Sessions are stateful resources; transcripts persist until you delete them. Applies to all Managed Agents sub-features, including Self-hosted sandboxes.
13 supportedModels:
14 - claude-fable-5-1
15 - claude-mythos-5-1
16 - claude-fable-5
17 - claude-mythos-5
18 - claude-mythos-preview
19 - claude-opus-5-5
20 - claude-opus-5
21 - claude-sonnet-5-5
22 - claude-sonnet-5
23 - claude-haiku-5-5
24 - claude-haiku-4-5-20251001
25 - claude-opus-4-8
26 - claude-opus-4-7
27 - claude-opus-4-6
28 - claude-sonnet-4-6
29 - claude-opus-4-5-20251101
30 - claude-sonnet-4-5-20250929
1131---
1232
1333[Custom tools](https://platform.claude.com/docs/en/managed-agents/tools#custom-tools) are tools your own code runs: the agent emits an `agent.custom_tool_use` event and waits for a matching `user.custom_tool_result`. Your worker can be that code. Because it runs inside your sandbox, the tool reaches the internal services, credentials, and network egress you configured for the sandbox, and nothing more.
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