migration changedmanaged-agents/migration
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500500* **System prompt and model:** Same fields, now on the agent definition.
501501* **Custom tools:** Still declared with JSON Schema. Execution moves from inline handling to responding to `agent.custom_tool_use` events. See [Session event stream](https://platform.claude.com/docs/en/managed-agents/events-and-streaming).
502* **Web search and web fetch settings:** Same `allowed_domains` (java, php: `allowedDomains`; csharp, go: `AllowedDomains`), `blocked_domains` (java, php: `blockedDomains`; csharp, go: `BlockedDomains`), `max_content_tokens` (java, php: `maxContentTokens`; csharp, go: `MaxContentTokens`), and `user_location` (java, php: `userLocation`; csharp, go: `UserLocation`) fields, now set once on the `web_search` and `web_fetch` entries of the agent toolset's `configs` (csharp, go: `Configs`) array instead of on every request. The `max_uses` (java, php: `maxUses`; csharp, go: `MaxUses`), `citations` (csharp, go: `Citations`), and `cache_control` (java, php: `cacheControl`; csharp, go: `CacheControl`) fields are not available. See [Differences from the Messages API tools](https://platform.claude.com/docs/en/managed-agents/tools-web-restrictions#differences-from-the-messages-api-tools).
502* **Web search and web fetch settings:** Same `allowed_domains` (java, php: `allowedDomains`; csharp, go: `AllowedDomains`), `blocked_domains` (java, php: `blockedDomains`; csharp, go: `BlockedDomains`), `max_content_tokens` (java, php: `maxContentTokens`; csharp, go: `MaxContentTokens`), and `user_location` (java, php: `userLocation`; csharp, go: `UserLocation`) fields, now set once on the `web_search` and `web_fetch` entries of the agent toolset’s `configs` (csharp, go: `Configs`) array instead of on every request. The `max_uses` (java, php: `maxUses`; csharp, go: `MaxUses`), `citations` (csharp, go: `Citations`), and `cache_control` (java, php: `cacheControl`; csharp, go: `CacheControl`) fields are not available. See [Differences from the Messages API tools](https://platform.claude.com/docs/en/managed-agents/tools-web-restrictions#differences-from-the-messages-api-tools).
503503* **Context:** You can still inject context through the system prompt, [file resources](https://platform.claude.com/docs/en/managed-agents/files), or [skills](https://platform.claude.com/docs/en/managed-agents/skills).
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505505## From the Claude Agent SDK
506506
507If 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.
507If 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.
508508
509509### What changes
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12111211### Features that move to your client
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1213The tradeoff for Anthropic running the agent loop is that a few things the SDK handled automatically become your client's responsibility.
1213The tradeoff for Anthropic running the agent loop is that a few things the SDK handled automatically become your client’s responsibility.
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12151215| SDK feature | Managed Agents approach |
12161216| ------------------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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