Vercel AI SDK
The Vercel AI SDK provider transforms Composio tools into Vercel's tool format with built-in execution, so you don't write a manual agentic loop. Each wrapped tool carries its own execute function, and the AI SDK calls it for you.
Install
npm install @composio/core @composio/vercel ai @ai-sdk/anthropicConfigure API Keys
Set COMPOSIO_API_KEY with your API key from Settings and ANTHROPIC_API_KEY with your Anthropic API key.
COMPOSIO_API_KEY=xxxxxxxxx
ANTHROPIC_API_KEY=xxxxxxxxxCreate session and run
The Vercel provider is agentic: tools include an execute function, so the AI SDK handles tool calls automatically. Set stopWhen to cap how many tool-calling steps a run can take.
import { anthropic } from "@ai-sdk/anthropic";
import { Composio } from "@composio/core";
import { VercelProvider } from "@composio/vercel";
import { generateText, stepCountIs } from "ai";
const composio = new Composio({ provider: new VercelProvider() });
// Create a session for your user
const session = await composio.create("user_123");
const tools = await session.tools();
const { text } = await generateText({
model: anthropic("claude-opus-4-6"),
tools,
prompt: "Send an email to john@example.com with the subject 'Hello' and body 'Hello from Composio!'",
stopWhen: stepCountIs(10),
});
console.log(text);Provider specifics
Strict mode. Some models reject tool schemas that contain optional parameters. Pass strict: true to the provider to drop every non-required property from each tool's input schema before it reaches the AI SDK:
import { Composio } from "@composio/core";
import { VercelProvider } from "@composio/vercel";
const composio = new Composio({ provider: new VercelProvider({ strict: true }) });The provider converts each Composio tool's JSON Schema to a Zod schema for the AI SDK and normalizes tool arguments, so it still works when a model emits tool input as a JSON string rather than an object.
Next
What is a session?
How sessions scope users, tools, and auth, and how to reuse them across requests.