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 { MessagesMessageParam } from "@openrouter/sdk/models";
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let value: MessagesMessageParam = {
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  content: "Hello, how are you?",
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  role: "user",
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};