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Documentation Index

Fetch the complete documentation index at: https://docs.fact0.io/llms.txt

Use this file to discover all available pages before exploring further.

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Vercel AI SDK

Use @fact0/sdk from any Next.js route handler or Vercel Function.

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Install

npm install @fact0/sdk

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Server-side audit + telemetry

import { streamText } from "ai";
import { openai } from "@ai-sdk/openai";
import { Fact0Client } from "@fact0/sdk";

const lf = new Fact0Client({ apiKey: process.env.FACT0_API_KEY! });

export async function POST(req: Request) {
  const { prompt, userId } = await req.json();

  await lf.audit.log({
    actor: { id: userId, type: "human" },
    action: "chat.message.send",
    resource: { id: prompt.id, type: "message" },
    outcome: "success",
  });

  const result = await streamText({
    model: openai("gpt-4o"),
    prompt: prompt.text,
  });

  return result.toAIStreamResponse();
}

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Stream telemetry

Wrap streamText calls in a telemetry execution to record latency and token counts.
Never expose alk_live_* keys in client code. @fact0/sdk is server-only.