For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.

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import { MessagesOutputConfigTypeJSONSchema } from "@openrouter/sdk/models";
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let value: MessagesOutputConfigTypeJSONSchema = "json_schema";

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"json_schema"