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migration changedmanaged-agents/migration

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23| You maintain the conversation history array and pass it back on every turn. | The session stores history server-side. Send events, receive events. |
23| You maintain the conversation history array and pass it back on every turn. | The session stores history server-side. You send events and receive events. |
2424| You iterate `tool_use` content blocks, run each tool, and loop back with `tool_result` messages. | Pre-built tools run inside the sandbox automatically. You only handle custom tools through `agent.custom_tool_use` events. |
2525| You provision your own sandbox for running agent-generated code. | The session sandbox handles code execution, file operations, and bash. |
2626| You decide when the loop is done. | The session emits `session.status_idle` when the agent has nothing more to do. |
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510510## From the Claude Agent SDK
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512If you built with the [Claude Agent SDK](https://code.claude.com/docs/en/agent-sdk/overview), you're already working with agents, tools, and sessions as concepts. The difference is where they run: the SDK runs in a process you operate, while Managed Agents runs in Anthropic's infrastructure. Most of the migration is mapping SDK configuration objects to their API-side equivalents.
512If you built with the [Claude Agent SDK](https://code.claude.com/docs/en/agent-sdk/overview), you're already working with agents, tools, and sessions as concepts. The difference is where they run: the SDK runs in a process you operate, whereas Managed Agents runs in Anthropic's infrastructure. Most of the migration is mapping SDK configuration objects to their API-side equivalents.
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514514### What changes
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12421242## Migrating between model versions
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1244When a new Claude model is released, migrating a Claude Managed Agents integration is typically a one-field change: update `model` (csharp, go: `Model`) on your [agent definition](https://platform.claude.com/docs/en/managed-agents/agent-setup) and the change takes effect on the next session you create.
1244When a new Claude model is released, migrating a Claude Managed Agents integration is typically a one-field change: update `model` (csharp, go: `Model`) on your [agent definition](https://platform.claude.com/docs/en/managed-agents/agent-setup), and the change takes effect on the next session you create.
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12461246<CodeGroup defaultLanguage="CLI">
12471247 ```bash cURL
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