feat: add vercel provider

[utkarsh-dixit]

TL;DR

Added Vercel AI SDK Provider with Model Context Protocol (MCP) support, including documentation and examples.

What changed?

• Added a new Vercel AI SDK Provider section to the MCP providers documentation
• Updated the VercelProvider class to support MCP integration through experimental_createMCPClient
• Created a new example file vercel-mcp-example.ts demonstrating Gmail integration via MCP
• Enhanced the Vercel example README with information about the new MCP capabilities
• Updated the provider documentation to include MCP-specific usage instructions
• Modified the provider to transform MCP URLs into the SSE format expected by Vercel AI SDK

How to test?

1. Run the new MCP example:

cd ts/examples/vercel
bun src/vercel-mcp-example.ts

2. Verify the provider works with Vercel AI SDK's MCP client:

import { VercelProvider } from '@composio/vercel';
import { experimental_createMCPClient } from 'ai';

const composio = new Composio({
  provider: new VercelProvider(),
});

const mcpConfig = await composio.mcp.create(...);
const serverUrls = await mcpConfig.getServer({ userId: "user-id" });
const client = await experimental_createMCPClient({ transport: serverUrls[0] });

Why make this change?

This change enables seamless integration between Composio's MCP servers and the Vercel AI SDK, allowing developers to use Composio's tools with Vercel's experimental MCP client. By supporting the SSE transport format expected by Vercel, users can now leverage Gmail and other external services through MCP in their Vercel AI applications with minimal configuration.

[utkarsh-dixit]

• feat: add vercel provider #1709 👈 (View in Graphite)
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[github-actions]

Preview your docs: https://composio-preview-6756b667-4270-4b8b-a646-06b0475322ef.docs.buildwithfern.com

[haxzie]

Mostly looks good to me, please add tests if possible 🙌🏽