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HomeDocsClaude Code CLI 20 Oct 2026
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Agent SDK reference - Python changedagent-sdk/python

Nearest release: v2.1.305, published 3 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 20 Oct 2026 22:33 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 20 Oct 2026 22:37 UTC.

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531531| `set_model(model)` | Change the model for the current session. Pass `None` to reset to [Claude Code's default model](/docs/en/model-config). A session in `auto` mode [changes to `default` mode](/docs/en/agent-sdk/permissions#auto-mode-auto) if the new model doesn't support auto mode |
532532| `rewind_files(user_message_id)` | Restore files to their state at the specified user message. Requires `enable_file_checkpointing=True`. See [File checkpointing](/docs/en/agent-sdk/file-checkpointing) |
533533| `get_mcp_status()` | Get the status of all configured MCP servers. Returns [`McpStatusResponse`](#mcpstatusresponse) |
534| `get_context_usage()` | Get a breakdown of context window usage by category, skill, and tool. The same data `/context` shows in an interactive session. Returns [`ContextUsageResponse`](#contextusageresponse). To compute the breakdown, Claude Code makes several token-counting API requests that don't appear in the message stream; see [how these requests are handled](#contextusageresponse) |
534| `get_context_usage()` | Get a breakdown of context window usage by category, skill, and tool. Includes the data `/context` shows in an interactive session. Returns [`ContextUsageResponse`](#contextusageresponse). To compute the breakdown, Claude Code makes several token-counting API requests that don't appear in the message stream; see [how these requests are handled](#contextusageresponse) |
535535| `reconnect_mcp_server(server_name)` | Retry connecting to an MCP server that failed or was disconnected |
536536| `toggle_mcp_server(server_name, enabled)` | Enable or disable an MCP server mid-session. Disabling a stdio, SSE, or HTTP server removes its tools |
537537| `stop_task(task_id)` | Stop a running background task. A [`TaskNotificationMessage`](#tasknotificationmessage) with status `"stopped"` follows in the message stream |
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15211521### `ContextUsageResponse`
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1523Response from [`ClaudeSDKClient.get_context_usage()`](#methods). This is the same payload Claude Code renders for the `/context` command in an interactive session, so alongside the token counts it carries display fields such as `color` and `gridRows` that Claude Code uses to draw the `/context` usage grid.
1523Response from [`ClaudeSDKClient.get_context_usage()`](#methods). The response includes the payload Claude Code renders for the `/context` command in an interactive session. Alongside the token counts, that payload carries display fields such as `color` and `gridRows` that Claude Code uses to draw the `/context` usage grid.
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15251525Claude Code builds this payload by sending several requests to the [token-counting](https://platform.claude.com/docs/en/build-with-claude/token-counting) API. These requests don't appear in the message stream, so cost tracking that reads the stream won't see them. On the Anthropic API, token counting isn't billed.
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