## Compatibility
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44description: Create a reusable, versioned agent configuration.
55---
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7## Compatibility
8- Status: Beta
9- [Beta header](https://platform.claude.com/docs/en/api/beta-headers): `managed-agents-2026-04-01`
10
711An agent is a reusable, versioned configuration that defines persona and capabilities. It bundles the model, system prompt, tools, MCP servers, and skills that shape how Claude behaves during a session.
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913Create the agent once as a reusable resource and reference it by ID each time you [start a session](https://platform.claude.com/docs/en/managed-agents/sessions). Agents are versioned and easier to manage across many sessions.
10
11<Note>
12 Managed Agents API requests require the `managed-agents-2026-04-01` beta header, except memory store endpoints, which use `agent-memory-2026-07-22` instead. The SDK sets the correct beta header automatically. See [Beta headers](https://platform.claude.com/docs/en/api/beta-headers#endpoint-specific-headers).
13</Note>
1414
1515## Agent configuration fields
1616