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HomeDocsClaude Code CLI 28 Sep 2026
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Agent SDK reference - TypeScript changedagent-sdk/typescript

Nearest release: v2.1.284, published 6 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 28 Sep 2026 23:53 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 29 Sep 2026 00:07 UTC.

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From line 647 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits115to this page, all time

The whole hunk

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from line 647
647647* **Applied during the current turn**: `model`. If you switch `model` while Claude is working on a turn, the response Claude is already generating finishes on the old model, and the rest of the turn, starting with the next call Claude Code makes to the model, uses the new one. Subagents keep their own model. Before v2.1.212, a mid-turn switch waited for the next turn.
648648* **No effect mid-session**: the system prompt options. These are resolved once at startup, so the running session keeps the original value even though the call succeeds. To change them, start a new session.
649649 
650`effortLevel` accepts an [effort level](/docs/en/model-config#adjust-effort-level) name. It also accepts `"ultracode"`, which requests `xhigh` effort with [ultracode](/docs/en/workflows#let-claude-decide-with-ultracode) on. `applyFlagSettings()` declares `effortLevel` without that value, so pass the equivalent `{ ultracode: true }` in TypeScript. The `ultracode` value requires Claude Code v2.1.203 or later and is accepted only by `applyFlagSettings()`, not by the `effortLevel` key in a settings file.
650`effortLevel` accepts an [effort level](/docs/en/model-config#adjust-effort-level) name. It also accepts `"ultracode"`, which requests `xhigh` effort with [ultracode](/docs/en/workflows#let-claude-decide-with-ultracode) on. `applyFlagSettings()` declares `effortLevel` without that value, so in TypeScript pass `{ ultracode: true, effortLevel: "xhigh" }` for the same result, or the [`ultracode`](/docs/en/settings-reference#ultracode) key alone to turn ultracode on at the session's current effort level. The `ultracode` value requires Claude Code v2.1.203 or later and is accepted only by `applyFlagSettings()`, not by the `effortLevel` key in a settings file. Before v2.1.284, the `ultracode` key alone also set the level to `xhigh`.
651651 
652652The values are written to the flag-settings layer, merged over what the inline `settings` option of `query()` set at startup. This is the same tier the [on-page precedence section](#settings-precedence) calls programmatic options.
653653 
from line 5498
54985498 allowedDomains?: string[];
54995499 deniedDomains?: string[];
55005500 strictAllowlist?: boolean;
5501 allowManagedDomainsOnly?: boolean;
5502 allowLocalBinding?: boolean;
5503 allowUnixSockets?: string[];
5504 allowAllUnixSockets?: boolean;
5505 httpProxyPort?: number;
5506 socksProxyPort?: number;
5507};
5508```
5509 
5510| Property | Type | Default | Description |
5511|
5501 allowM
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