How to integrate Vercel MCP with Pydantic AI

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Introduction

This guide walks you through connecting Vercel to Pydantic AI using the Composio tool router. By the end, you'll have a working Vercel agent that can deploy latest changes to your project, add api key as production environment variable, check if mydomain.com is available for purchase through natural language commands.

This guide will help you understand how to give your Pydantic AI agent real control over a Vercel account through Composio's Vercel MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Vercel with

TL;DR

Here's what you'll learn:
  • How to set up your Composio API key and User ID
  • How to create a Composio Tool Router session for Vercel
  • How to attach an MCP Server to a Pydantic AI agent
  • How to stream responses and maintain chat history
  • How to build a simple REPL-style chat interface to test your Vercel workflows

What is Pydantic AI?

Pydantic AI is a Python framework for building AI agents with strong typing and validation. It leverages Pydantic's data validation capabilities to create robust, type-safe AI applications.

Key features include:

  • Type Safety: Built on Pydantic for automatic data validation
  • MCP Support: Native support for Model Context Protocol servers
  • Streaming: Built-in support for streaming responses
  • Async First: Designed for async/await patterns

What is the Vercel MCP server, and what's possible with it?

The Vercel MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Vercel account. It provides structured and secure access to your Vercel projects and deployments, so your agent can perform actions like creating deployments, managing environment variables, handling edge configs, and checking domain statuses on your behalf.

  • Automated deployments and rollbacks: Easily instruct your agent to create new deployments or remove outdated ones, streamlining your release process without manual steps.
  • Environment variable management: Let your agent add or update sensitive configuration values across different environments, ensuring your projects are set up correctly before a deploy.
  • Edge configuration and token handling: Have your agent create new edge configs or generate secure tokens for read-only access, optimizing how your content is served globally.
  • Domain availability and pricing checks: Ask your agent to verify if a domain is available and fetch the latest price before you make a purchase decision.
  • Authentication token management: Enable your agent to create or revoke Vercel API tokens, giving you fine-grained control over programmatic access to your account.

Supported Tools & Triggers

Tools
Add Environment VariableTool to add an environment variable to a Vercel project.
Add Domain to ProjectTool to attach a custom domain to a Vercel project.
Assign Alias to DeploymentTool to assign an alias to a specific Vercel deployment.
Batch Remove Project Environment VariablesTool to batch remove environment variables from a Vercel project.
Buy DomainsTool to purchase multiple domains through Vercel's domain registrar.
Buy Single DomainTool to purchase a domain through Vercel's domain registrar.
Check Artifact ExistsTool to check if a cache artifact exists by its hash.
Check Domain AvailabilityTool to check if a domain is available for registration.
Check Domain PriceCheck pricing for a domain including purchase, renewal, and transfer costs.
Create Auth TokenTool to create a new authentication token.
Create DNS RecordTool to create a new DNS record for a domain.
Create Edge ConfigCreates a new Edge Config for storing key-value data at the edge.
Create Edge Config TokenCreate a read access token for a specific Edge Config.
Create new deploymentTool to create a new deployment.
Create or Transfer DomainTool to add an existing domain to the Vercel platform.
Create Vercel Project (v2)Tool to create a new Vercel project with comprehensive configuration options.
Create Project Transfer RequestTool to create a project transfer request.
Create Shared Environment VariableTool to create one or more shared environment variables in Vercel.
Create WebhookTool to create a webhook for receiving notifications about Vercel events.
Dangerously Delete By Source ImagesTool to dangerously delete edge cache by source image URLs.
Dangerously Delete Cache By TagsTool to dangerously delete edge cache by tags.
Delete Vercel AliasTool to delete an alias from Vercel.
Delete Auth TokenTool to delete an authentication token.
Purge All Data CacheTool to purge all data cache entries for a specific project.
Delete Deployment (V2)Permanently delete a Vercel deployment by its ID or URL.
Delete DNS RecordTool to delete a DNS record from a domain.
Delete DomainTool to remove a domain by name from Vercel.
Delete Edge ConfigTool to delete an Edge Config by its unique identifier.
Delete Edge Config Tokens (v2)Tool to delete one or more Edge Config tokens.
Delete Vercel Project (v2)Tool to delete a Vercel project by ID or name.
Remove Project Environment VariableTool to remove an environment variable from a Vercel project.
Delete Rolling Release ConfigurationTool to delete rolling release configuration for a project.
Delete Shared Env VariableTool to delete one or more shared environment variables.
Delete Vercel WebhookDelete a webhook by its unique ID to stop receiving event notifications.
Download Cache ArtifactDownload a cache artifact from Vercel's Remote Cache by its hash.
Edit Project Environment VariableTool to edit an environment variable in a Vercel project.
Filter Project Environment VariablesTool to retrieve environment variables of a Vercel project by id or name.
Get Active Attack StatusTool to read active attack data from Vercel Firewall for a specific project.
Get Vercel AliasTool to retrieve information about a Vercel alias by ID or alias name.
Query Artifact InformationTool to query information about artifacts by their hashes.
Get Auth Token MetadataTool to retrieve metadata for an authentication token.
Get Authenticated UserTool to get the authenticated user's profile.
Get Bulk Domain AvailabilityTool to check availability for multiple domains at once.
Get Remote Caching StatusTool to get the status of Remote Caching for the principal.
Get SSL/TLS CertificatesTool to retrieve SSL/TLS certificates for the authenticated user or team.
Get Integration ConfigurationsTool to get configurations for the authenticated user or team.
Get Contact Info SchemaTool to retrieve the contact information schema for a domain's top-level domain (TLD).
Get Deployment by ID or URLTool to get a deployment by ID or URL.
Get Deployment EventsTool to get deployment events for a specific Vercel deployment by ID or URL.
Get Deployment File ContentsRetrieve the contents of a specific file from a Vercel deployment.
Get Deployment Runtime LogsTool to retrieve runtime logs for a specific Vercel deployment by project and deployment ID.
Get DeploymentsTool to list deployments from Vercel.
Get Domain InformationTool to retrieve complete information for a single domain.
Get Domain ConfigurationTool to get a domain's configuration details from Vercel.
Get Domain Transfer InfoTool to get information required to transfer a domain to Vercel.
Get All DrainsTool to retrieve a list of all drains.
Get Edge ConfigTool to retrieve detailed information about a specific Edge Config by ID.
Get Edge Config BackupTool to retrieve a specific backup version of an Edge Config.
Get Edge Config ItemTool to retrieve a specific item within an Edge Config.
Get Edge Config SchemaTool to retrieve the JSON schema of a specific Edge Config.
Get Edge Config TokenTool to retrieve details of a specific token associated with an Edge Config.
Get Firewall ConfigurationTool to retrieve firewall configuration for a Vercel project.
List Git NamespacesTool to list Git namespaces (organizations/users) by provider.
Find Project by ID or NameTool to find a project by ID or name with comprehensive details.
Get Project DomainTool to retrieve details about a specific domain attached to a Vercel project.
List Project DomainsTool to retrieve all domains attached to a Vercel project.
Get Project Environment VariableTool to retrieve the decrypted value of an environment variable from a Vercel project.
Get ProjectsTool to retrieve a list of projects from Vercel.
List Promote AliasesTool to get a list of aliases with status for the current promote operation.
Get Rolling ReleaseTool to retrieve active rolling release information for a Vercel project.
Get Rolling Release Billing StatusTool to retrieve the rolling release billing status for a Vercel project.
Get Rolling Release ConfigTool to get rolling release configuration for a Vercel project.
Get Shared Environment VariableTool to retrieve the decrypted value of a Shared Environment Variable by id.
List Shared Environment VariablesTool to list all shared environment variables for a team.
Get Team DetailsRetrieves detailed information about a specific Vercel team by its ID or slug.
Get All TeamsTool to list all teams accessible to the authenticated user with detailed information.
Get TLD InfoTool to get information about a specific top-level domain (TLD).
Get TLD PriceTool to get pricing information for a specific top-level domain (TLD).
List User EventsTool to list user events.
Get WebhookTool to retrieve details of a specific webhook by ID.
Invalidate Cache By Source ImagesTool to invalidate edge cache by source image URLs.
Invalidate Cache By TagsTool to invalidate edge cache by tags.
List Vercel AliasesTool to list aliases from Vercel API.
List Auth TokensTool to list authentication tokens.
List Deployment AliasesTool to list all aliases assigned to a specific deployment.
List Deployment ChecksTool to retrieve a list of checks for a specific deployment.
List Deployment FilesTool to list all files in a specific deployment.
List DNS RecordsTool to list existing DNS records for a domain.
Get DomainsTool to list all domains from Vercel.
Get Edge Config BackupsTool to retrieve backups for a specific Edge Config.
Get Edge Config ItemsTool to retrieve all items from a specific Edge Config.
Get Edge ConfigsTool to retrieve all Edge Configs for an account or team.
Get Edge Config TokensTool to get all tokens of an Edge Config.
Get Firewall Events by ProjectRetrieve firewall events and security actions for a specific Vercel project.
Get Integration Log DrainsRetrieves a list of Integration log drains for a team or account.
Get Project Custom EnvironmentsTool to retrieve custom environments for a Vercel project.
Get Project MembersTool to list all members of a Vercel project.
Get Supported TLDsTool to retrieve all TLDs (top-level domains) supported by Vercel for domain registration.
Get Team MembersTool to list all members of a Vercel team.
Get List of WebhooksTool to retrieve a list of all webhooks for the authenticated account or team.
Move Project DomainTool to move a domain from one Vercel project to another.
Pause Vercel ProjectTool to pause a Vercel project.
Read Firewall ConfigurationTool to read firewall configuration for a Vercel project.
Record Artifacts Cache EventsTool to record artifacts cache usage events.
Remove Domain from ProjectTool to remove a domain from a Vercel project.
Update Vercel Firewall ConfigurationTool to update firewall configuration for a Vercel project.
Request Delete User AccountTool to initiate user account deletion on Vercel.
Promote Deployment to ProductionTool to promote a deployment to production by pointing all production domains for a project to the given deployment.
Search Git RepositoriesTool to search and list Git repositories linked to a namespace by provider.
Test Drain ConfigurationTool to validate a drain delivery configuration by sending a test request.
Transfer In DomainTool to transfer a domain to Vercel from another registrar.
Unlink Shared Environment VariableTool to disconnect a shared environment variable from a Vercel project.
Unpause Vercel ProjectTool to unpause a specific project by its ID.
Update Attack Challenge ModeTool to update Attack Challenge mode for a Vercel project.
Update DNS RecordTool to update an existing DNS record.
Patch DomainTool to update or move an apex domain on Vercel.
Update Edge ConfigTool to update an Edge Config by changing its slug.
Update Edge Config ItemsTool to update items within a specific Edge Config.
Update Edge Config SchemaTool to update the JSON Schema for an Edge Config.
Update Firewall ConfigurationTool to incrementally update Vercel Firewall configuration for a project using PATCH.
Update Vercel Project (v2)Tool to update an existing Vercel project configuration.
Update Project Data CacheTool to update the data cache feature for a Vercel project.
Update Project DomainTool to update a project domain in Vercel.
Update Project Protection BypassTool to update protection bypass for automation on a Vercel project.
Update Shared Env VariableTool to update one or more shared environment variables.
Update Project Static IPsTool to configure Static IPs for a Vercel project.
Update TeamTool to update a Vercel team's configuration.
Update URL Protection BypassTool to update the protection bypass for a URL.
Upload Cache ArtifactTool to upload a cache artifact to Vercel.
Upload Deployment FileTool to upload deployment files to Vercel.
Verify Project DomainAttempts to verify a project domain by checking if DNS challenges are correctly configured.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Prerequisites

Before starting, make sure you have:
  • Python 3.9 or higher
  • A Composio account with an active API key
  • Basic familiarity with Python and async programming

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard and create an API key. You'll need credits to use the models, or you can connect to another model provider.
  • Keep the API key safe.
Composio API Key
  • Log in to the Composio dashboard.
  • Navigate to your API settings and generate a new API key.
  • Store this key securely as you'll need it for authentication.

Install dependencies

bash
pip install composio pydantic-ai python-dotenv

Install the required libraries.

What's happening:

  • composio connects your agent to external SaaS tools like Vercel
  • pydantic-ai lets you create structured AI agents with tool support
  • python-dotenv loads your environment variables securely from a .env file

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
USER_ID=your_user_id_here
OPENAI_API_KEY=your_openai_api_key

Create a .env file in your project root.

What's happening:

  • COMPOSIO_API_KEY authenticates your agent to Composio's API
  • USER_ID associates your session with your account for secure tool access
  • OPENAI_API_KEY to access OpenAI LLMs

Import dependencies

python
import asyncio
import os
from dotenv import load_dotenv
from composio import Composio
from pydantic_ai import Agent
from pydantic_ai.mcp import MCPServerStreamableHTTP

load_dotenv()
What's happening:
  • We load environment variables and import required modules
  • Composio manages connections to Vercel
  • MCPServerStreamableHTTP connects to the Vercel MCP server endpoint
  • Agent from Pydantic AI lets you define and run the AI assistant

Create a Tool Router Session

python
async def main():
    api_key = os.getenv("COMPOSIO_API_KEY")
    user_id = os.getenv("USER_ID")
    if not api_key or not user_id:
        raise RuntimeError("Set COMPOSIO_API_KEY and USER_ID in your environment")

    # Create a Composio Tool Router session for Vercel
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["vercel"],
    )
    url = session.mcp.url
    if not url:
        raise ValueError("Composio session did not return an MCP URL")
What's happening:
  • We're creating a Tool Router session that gives your agent access to Vercel tools
  • The create method takes the user ID and specifies which toolkits should be available
  • The returned session.mcp.url is the MCP server URL that your agent will use

Initialize the Pydantic AI Agent

python
# Attach the MCP server to a Pydantic AI Agent
vercel_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
agent = Agent(
    "openai:gpt-5",
    toolsets=[vercel_mcp],
    instructions=(
        "You are a Vercel assistant. Use Vercel tools to help users "
        "with their requests. Ask clarifying questions when needed."
    ),
)
What's happening:
  • The MCP client connects to the Vercel endpoint
  • The agent uses GPT-5 to interpret user commands and perform Vercel operations
  • The instructions field defines the agent's role and behavior

Build the chat interface

python
# Simple REPL with message history
history = []
print("Chat started! Type 'exit' or 'quit' to end.\n")
print("Try asking the agent to help you with Vercel.\n")

while True:
    user_input = input("You: ").strip()
    if user_input.lower() in {"exit", "quit", "bye"}:
        print("\nGoodbye!")
        break
    if not user_input:
        continue

    print("\nAgent is thinking...\n", flush=True)

    async with agent.run_stream(user_input, message_history=history) as stream_result:
        collected_text = ""
        async for chunk in stream_result.stream_output():
            text_piece = None
            if isinstance(chunk, str):
                text_piece = chunk
            elif hasattr(chunk, "delta") and isinstance(chunk.delta, str):
                text_piece = chunk.delta
            elif hasattr(chunk, "text"):
                text_piece = chunk.text
            if text_piece:
                collected_text += text_piece
        result = stream_result

    print(f"Agent: {collected_text}\n")
    history = result.all_messages()
What's happening:
  • The agent reads input from the terminal and streams its response
  • Vercel API calls happen automatically under the hood
  • The model keeps conversation history to maintain context across turns

Run the application

python
if __name__ == "__main__":
    asyncio.run(main())
What's happening:
  • The asyncio loop launches the agent and keeps it running until you exit

Complete Code

Here's the complete code to get you started with Vercel and Pydantic AI:

python
import asyncio
import os
from dotenv import load_dotenv
from composio import Composio
from pydantic_ai import Agent
from pydantic_ai.mcp import MCPServerStreamableHTTP

load_dotenv()

async def main():
    api_key = os.getenv("COMPOSIO_API_KEY")
    user_id = os.getenv("USER_ID")
    if not api_key or not user_id:
        raise RuntimeError("Set COMPOSIO_API_KEY and USER_ID in your environment")

    # Create a Composio Tool Router session for Vercel
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["vercel"],
    )
    url = session.mcp.url
    if not url:
        raise ValueError("Composio session did not return an MCP URL")

    # Attach the MCP server to a Pydantic AI Agent
    vercel_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
    agent = Agent(
        "openai:gpt-5",
        toolsets=[vercel_mcp],
        instructions=(
            "You are a Vercel assistant. Use Vercel tools to help users "
            "with their requests. Ask clarifying questions when needed."
        ),
    )

    # Simple REPL with message history
    history = []
    print("Chat started! Type 'exit' or 'quit' to end.\n")
    print("Try asking the agent to help you with Vercel.\n")

    while True:
        user_input = input("You: ").strip()
        if user_input.lower() in {"exit", "quit", "bye"}:
            print("\nGoodbye!")
            break
        if not user_input:
            continue

        print("\nAgent is thinking...\n", flush=True)

        async with agent.run_stream(user_input, message_history=history) as stream_result:
            collected_text = ""
            async for chunk in stream_result.stream_output():
                text_piece = None
                if isinstance(chunk, str):
                    text_piece = chunk
                elif hasattr(chunk, "delta") and isinstance(chunk.delta, str):
                    text_piece = chunk.delta
                elif hasattr(chunk, "text"):
                    text_piece = chunk.text
                if text_piece:
                    collected_text += text_piece
            result = stream_result

        print(f"Agent: {collected_text}\n")
        history = result.all_messages()

if __name__ == "__main__":
    asyncio.run(main())

Conclusion

You've built a Pydantic AI agent that can interact with Vercel through Composio's Tool Router. With this setup, your agent can perform real Vercel actions through natural language. You can extend this further by:
  • Adding other toolkits like Gmail, HubSpot, or Salesforce
  • Building a web-based chat interface around this agent
  • Using multiple MCP endpoints to enable cross-app workflows (for example, Gmail + Vercel for workflow automation)
This architecture makes your AI agent "agent-native", able to securely use APIs in a unified, composable way without custom integrations.

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FAQ

What are the differences in Tool Router MCP and Vercel MCP?

With a standalone Vercel MCP server, the agents and LLMs can only access a fixed set of Vercel tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Vercel and many other apps based on the task at hand, all through a single MCP endpoint.

Can I use Tool Router MCP with Pydantic AI?

Yes, you can. Pydantic AI fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Vercel tools.

Can I manage the permissions and scopes for Vercel while using Tool Router?

Yes, absolutely. You can configure which Vercel scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

How safe is my data with Composio Tool Router?

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Vercel data and credentials are handled as safely as possible.

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