session-operations changedmanaged-agents/session-operations
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2121| `idle` | Agent is waiting for input, including user messages or tool confirmations. Sessions created without `initial_events` (java, php: `initialEvents`; csharp, go: `InitialEvents`) start in `idle`. A session can be `idle` while a [workflow run](https://platform.claude.com/docs/en/managed-agents/workflow-runs#while-a-run-is-open) is still open, so `idle` alone doesn't mean that the work is done. See [Know when the work is done](https://platform.claude.com/docs/en/managed-agents/workflow-runs#know-when-the-work-is-done). |
2222| `running` | Agent is actively executing. |
2323| `rescheduling` | Transient error occurred, retrying automatically. |
24| `terminated` | Session has ended, either because of an unrecoverable error or because it was archived. A session that finishes its work goes `idle`, not `terminated`. |
24| `terminated` | Session has ended, either because of an unrecoverable error or because it was archived. A session that completes its work goes `idle`, not `terminated`. |
2525
2626## Updating the agent configuration
2727
28You can update a session's `agent.tools` (csharp, go: `Agent.Tools`) and `agent.mcp_servers` (java, php: `agent.mcpServers`; csharp: `Agent.McpServers`; go: `Agent.MCPServers`), including permission policies and per-tool web settings such as [domain filters](https://platform.claude.com/docs/en/managed-agents/tools-web-restrictions#change-the-lists-mid-session), mid-session without creating a new agent version. Updates are session-local and do not propagate back to the underlying agent. Updated `allowed_domains` (java, php: `allowedDomains`; csharp, go: `AllowedDomains`) and `blocked_domains` (java, php: `blockedDomains`; csharp, go: `BlockedDomains`) apply to the rest of the session.
28You can update a session's `agent.tools` (csharp, go: `Agent.Tools`) and `agent.mcp_servers` (java, php: `agent.mcpServers`; csharp: `Agent.McpServers`; go: `Agent.MCPServers`), including permission policies and per-tool web settings such as [domain filters](https://platform.claude.com/docs/en/managed-agents/tools-web-restrictions#change-the-lists-mid-session), mid-session without creating a new agent version. Updates are session-local and do not apply to the underlying agent. Updated `allowed_domains` (java, php: `allowedDomains`; csharp, go: `AllowedDomains`) and `blocked_domains` (java, php: `blockedDomains`; csharp, go: `BlockedDomains`) apply to the rest of the session.
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3030Only the agent's `tools` (csharp, go: `Tools`) and `mcp_servers` (java, php: `mcpServers`; csharp: `McpServers`; go: `MCPServers`) can change after a session is created. To run a session with `model` (csharp, go: `Model`), `system` (csharp, go: `System`; ruby: `system_`), or `skills` (csharp, go: `Skills`) values other than the agent's, use [agent configuration overrides](https://platform.claude.com/docs/en/managed-agents/sessions#override-agent-configuration-for-a-session) when you create the session. The agent's model configuration, including its [`inference_geo`](https://platform.claude.com/docs/en/manage-claude/data-residency) pin, also can't change mid-session: set the pin when you save the agent, or set or clear it for a single session with a `model` (csharp, go: `Model`) override when you create it. The agent's configured `system` (csharp, go: `System`; ruby: `system_`) field is fixed for the session's lifetime. On models that support it, you can still append system-level guidance mid-session by sending a [`system.message` event](https://platform.claude.com/docs/en/managed-agents/events-and-streaming#send-system-messages).
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