How to integrate Digicert MCP with Vercel AI SDK v6

This guide walks you through connecting Digicert to Vercel AI SDK v6 using the Composio tool router. By the end, you'll have a working Digicert agent that can list all intermediate certificates for your account, create a new api key for admin, update the schedule for monthly security reports through natural language commands. This guide will help you understand how to give your Vercel AI SDK agent real control over a Digicert account through Composio's Digicert MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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DigiCert is a global leader in high-assurance TLS/SSL, PKI, and digital signing solutions. It enables secure, trusted digital interactions for enterprises and IoT devices.

101 Tools

Introduction

This guide walks you through connecting Digicert to Vercel AI SDK v6 using the Composio tool router. By the end, you'll have a working Digicert agent that can list all intermediate certificates for your account, create a new api key for admin, update the schedule for monthly security reports through natural language commands.

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

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

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TL;DR

Here's what you'll learn:
  • How to set up and configure a Vercel AI SDK agent with Digicert integration
  • Using Composio's Tool Router to dynamically load and access Digicert tools
  • Creating an MCP client connection using HTTP transport
  • Building an interactive CLI chat interface with conversation history management
  • Handling tool calls and results within the Vercel AI SDK framework

What is Vercel AI SDK?

The Vercel AI SDK is a TypeScript library for building AI-powered applications. It provides tools for creating agents that can use external services and maintain conversation state.

Key features include:

  • streamText: Core function for streaming responses with real-time tool support
  • MCP Client: Built-in support for Model Context Protocol via @ai-sdk/mcp
  • Step Counting: Control multi-step tool execution with stopWhen: stepCountIs()
  • OpenAI Provider: Native integration with OpenAI models

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

The Digicert MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Digicert account. It provides structured and secure access to your digital certificate management, so your agent can perform actions like auditing users, creating API keys, checking permissions, listing certificates, and updating reports on your behalf.

  • API key management and creation: Let your agent securely generate new API keys for specific users and permissions, ensuring controlled access for your team and services.
  • Permission and access validation: Have your agent check if specific permissions are available before performing sensitive operations, helping you enforce security best practices automatically.
  • Intermediate certificate inventory: Instantly retrieve and review all intermediate certificates in your Digicert account—perfect for audits or compliance checks.
  • User management and auditing: Effortlessly list all CertCentral account users, including detailed information for each user, to streamline management and oversight.
  • Automated report configuration updates: Direct your agent to update scheduled report configurations—changing recipients, formats, or schedules—with just a single instruction.

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

Step by step09 STEPS
1

Prerequisites

Before you begin, make sure you have:
  • Node.js and npm installed
  • A Composio account with API key
  • An OpenAI API key
2

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.
3

Install required dependencies

bash
npm install @ai-sdk/openai @ai-sdk/mcp @composio/core ai dotenv

First, install the necessary packages for your project.

What you're installing:

  • @ai-sdk/openai: Vercel AI SDK's OpenAI provider
  • @ai-sdk/mcp: MCP client for Vercel AI SDK
  • @composio/core: Composio SDK for tool integration
  • ai: Core Vercel AI SDK
  • dotenv: Environment variable management
4

Set up environment variables

bash
OPENAI_API_KEY=your_openai_api_key_here
COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_user_id_here

Create a .env file in your project root.

What's needed:

  • OPENAI_API_KEY: Your OpenAI API key for GPT model access
  • COMPOSIO_API_KEY: Your Composio API key for tool access
  • COMPOSIO_USER_ID: A unique identifier for the user session
5

Import required modules and validate environment

typescript
import "dotenv/config";
import { openai } from "@ai-sdk/openai";
import { Composio } from "@composio/core";
import * as readline from "readline";
import { streamText, type ModelMessage, stepCountIs } from "ai";
import { createMCPClient } from "@ai-sdk/mcp";

const composioAPIKey = process.env.COMPOSIO_API_KEY;
const composioUserID = process.env.COMPOSIO_USER_ID;

if (!process.env.OPENAI_API_KEY) throw new Error("OPENAI_API_KEY is not set");
if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set");
if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set");

const composio = new Composio({
  apiKey: composioAPIKey,
});
What's happening:
  • We're importing all necessary libraries including Vercel AI SDK's OpenAI provider and Composio
  • The dotenv/config import automatically loads environment variables
  • The MCP client import enables connection to Composio's tool server
6

Create Tool Router session and initialize MCP client

typescript
async function main() {
  // Create a tool router session for the user
  const session = await composio.create(composioUserID!, {
    toolkits: ["digicert"],
  });

  const mcpUrl = session.mcp.url;
What's happening:
  • We're creating a Tool Router session that gives your agent access to Digicert tools
  • The create method takes the user ID and specifies which toolkits should be available
  • The returned mcp object contains the URL and authentication headers needed to connect to the MCP server
  • This session provides access to all Digicert-related tools through the MCP protocol
7

Connect to MCP server and retrieve tools

typescript
const mcpClient = await createMCPClient({
  transport: {
    type: "http",
    url: mcpUrl,
    headers: session.mcp.headers, // Authentication headers for the Composio MCP server
  },
});

const tools = await mcpClient.tools();
What's happening:
  • We're creating an MCP client that connects to our Composio Tool Router session via HTTP
  • The mcp.url provides the endpoint, and mcp.headers contains authentication credentials
  • The type: "http" is important - Composio requires HTTP transport
  • tools() retrieves all available Digicert tools that the agent can use
8

Initialize conversation and CLI interface

typescript
let messages: ModelMessage[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
console.log(
  "Ask any questions related to digicert, like summarize my last 5 emails, send an email, etc... :)))\n",
);

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  prompt: "> ",
});

rl.prompt();
What's happening:
  • We initialize an empty messages array to maintain conversation history
  • A readline interface is created to accept user input from the command line
  • Instructions are displayed to guide the user on how to interact with the agent
9

Handle user input and stream responses with real-time tool feedback

typescript
rl.on("line", async (userInput: string) => {
  const trimmedInput = userInput.trim();

  if (["exit", "quit", "bye"].includes(trimmedInput.toLowerCase())) {
    console.log("\nGoodbye!");
    rl.close();
    process.exit(0);
  }

  if (!trimmedInput) {
    rl.prompt();
    return;
  }

  messages.push({ role: "user", content: trimmedInput });
  console.log("\nAgent is thinking...\n");

  try {
    const stream = streamText({
      model: openai("gpt-5"),
      messages,
      tools,
      toolChoice: "auto",
      stopWhen: stepCountIs(10),
      onStepFinish: (step) => {
        for (const toolCall of step.toolCalls) {
          console.log(`[Using tool: ${toolCall.toolName}]`);
          }
          if (step.toolCalls.length > 0) {
            console.log(""); // Add space after tool calls
          }
        },
      });

      for await (const chunk of stream.textStream) {
        process.stdout.write(chunk);
      }

      console.log("\n\n---\n");

      // Get final result for message history
      const response = await stream.response;
      if (response?.messages?.length) {
        messages.push(...response.messages);
      }
    } catch (error) {
      console.error("\nAn error occurred while talking to the agent:");
      console.error(error);
      console.log(
        "\nYou can try again or restart the app if it keeps happening.\n",
      );
    } finally {
      rl.prompt();
    }
  });

  rl.on("close", async () => {
    await mcpClient.close();
    console.log("\n👋 Session ended.");
    process.exit(0);
  });
}

main().catch((err) => {
  console.error("Fatal error:", err);
  process.exit(1);
});
What's happening:
  • We use streamText instead of generateText to stream responses in real-time
  • toolChoice: "auto" allows the model to decide when to use Digicert tools
  • stopWhen: stepCountIs(10) allows up to 10 steps for complex multi-tool operations
  • onStepFinish callback displays which tools are being used in real-time
  • We iterate through the text stream to create a typewriter effect as the agent responds
  • The complete response is added to conversation history to maintain context
  • Errors are caught and displayed with helpful retry suggestions

Complete Code

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

typescript
import "dotenv/config";
import { openai } from "@ai-sdk/openai";
import { Composio } from "@composio/core";
import * as readline from "readline";
import { streamText, type ModelMessage, stepCountIs } from "ai";
import { createMCPClient } from "@ai-sdk/mcp";

const composioAPIKey = process.env.COMPOSIO_API_KEY;
const composioUserID = process.env.COMPOSIO_USER_ID;

if (!process.env.OPENAI_API_KEY) throw new Error("OPENAI_API_KEY is not set");
if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set");
if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set");

const composio = new Composio({
  apiKey: composioAPIKey,
});

async function main() {
  // Create a tool router session for the user
  const session = await composio.create(composioUserID!, {
    toolkits: ["digicert"],
  });

  const mcpUrl = session.mcp.url;

  const mcpClient = await createMCPClient({
    transport: {
      type: "http",
      url: mcpUrl,
      headers: session.mcp.headers, // Authentication headers for the Composio MCP server
    },
  });

  const tools = await mcpClient.tools();

  let messages: ModelMessage[] = [];

  console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
  console.log(
    "Ask any questions related to digicert, like summarize my last 5 emails, send an email, etc... :)))\n",
  );

  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: "> ",
  });

  rl.prompt();

  rl.on("line", async (userInput: string) => {
    const trimmedInput = userInput.trim();

    if (["exit", "quit", "bye"].includes(trimmedInput.toLowerCase())) {
      console.log("\nGoodbye!");
      rl.close();
      process.exit(0);
    }

    if (!trimmedInput) {
      rl.prompt();
      return;
    }

    messages.push({ role: "user", content: trimmedInput });
    console.log("\nAgent is thinking...\n");

    try {
      const stream = streamText({
        model: openai("gpt-5"),
        messages,
        tools,
        toolChoice: "auto",
        stopWhen: stepCountIs(10),
        onStepFinish: (step) => {
          for (const toolCall of step.toolCalls) {
            console.log(`[Using tool: ${toolCall.toolName}]`);
          }
          if (step.toolCalls.length > 0) {
            console.log(""); // Add space after tool calls
          }
        },
      });

      for await (const chunk of stream.textStream) {
        process.stdout.write(chunk);
      }

      console.log("\n\n---\n");

      // Get final result for message history
      const response = await stream.response;
      if (response?.messages?.length) {
        messages.push(...response.messages);
      }
    } catch (error) {
      console.error("\nAn error occurred while talking to the agent:");
      console.error(error);
      console.log(
        "\nYou can try again or restart the app if it keeps happening.\n",
      );
    } finally {
      rl.prompt();
    }
  });

  rl.on("close", async () => {
    await mcpClient.close();
    console.log("\n👋 Session ended.");
    process.exit(0);
  });
}

main().catch((err) => {
  console.error("Fatal error:", err);
  process.exit(1);
});

Conclusion

You've successfully built a Digicert agent using the Vercel AI SDK with streaming capabilities! This implementation provides a powerful foundation for building AI applications with natural language interfaces and real-time feedback.

Key features of this implementation:

  • Real-time streaming responses for a better user experience with typewriter effect
  • Live tool execution feedback showing which tools are being used as the agent works
  • Dynamic tool loading through Composio's Tool Router with secure authentication
  • Multi-step tool execution with configurable step limits (up to 10 steps)
  • Comprehensive error handling for robust agent execution
  • Conversation history maintenance for context-aware responses

You can extend this further by adding custom error handling, implementing specific business logic, or integrating additional Composio toolkits to create multi-app workflows.
TOOLS

Supported Tools

Every Digicert action and event your agent gets out of the box.

Add Tags to Certificate

Tool to add custom tags to one or more certificates for categorization.

Check Permission

Tool to check if a specific permission is available.

Create API Key

Tool to create a new API key with specified permissions.

Create AuthKey

Tool to create a new AuthKey for account authentication.

Create Container IP Rules

Tool to add an IP restriction rule to a CertCentral account.

Create Finance Order Pricing

Tool to get price estimates for a certificate order.

Create Organization

Tool to create a new organization in your DigiCert CertCentral account.

Create Organization Validation

Tool to submit an organization for validation and add verified contacts for specific product types.

List Scan Templates

Tool to retrieve the list of scan templates along with their name, status, and configuration.

Delete Account AuthKey

Tool to delete your account's AuthKey.

Delete Certificate from Discovery

Tool to delete certificates from DigiCert Discovery inventory.

Delete Domain

Tool to delete a domain with the given ID.

Delete SSH Key

Tool to delete SSH keys from DigiCert Discovery.

Delete Discovery Endpoints

Tool to delete one or more endpoints from the Discovery API.

Execute GraphQL Query

Tool to execute GraphQL queries against DigiCert Custom Reports API.

Filter Keys

Tool to filter keys in DigiCert Discovery API by various criteria.

Get Account Details

Tool to retrieve details about your CertCentral account.

Get Account Details

Tool to retrieve account details for the authenticated user.

Get Account Guest Access URL

Tool to retrieve the guest access URL for your DigiCert account.

Get Account Metadata

Tool to retrieve metadata for custom order fields in the account.

Get Account SAML Entity

Tool to retrieve SAML entity details for your account.

Get Agent IP Port Details

Tool to retrieve agent IP port details from DigiCert Discovery API.

Get Alert Count

Tool to retrieve alert count from DigiCert Discovery API dashboard.

Get AuthKey Details

Tool to retrieve AuthKey details by ID.

List Authorized Containers

Tool to list all containers authorized to perform a permission action.

Get Certificate Authority Helper

Tool to retrieve certificate authority API helper information including version details.

Get Certificate Security Rating

Tool to retrieve SSL certificate security rating from DigiCert Discovery API.

Get Cloud Scan Details

Tool to get cloud scan details from DigiCert Discovery API.

Get Container by ID

Tool to get details about a specific container using its ID.

Get Container Children

Tool to list all child containers for a parent container.

Get Container IP Rules

Tool to retrieve a list of existing IP restriction rules in a CertCentral account.

Get Container Order Organizations

Tool to list all organizations assigned to a container.

Get Container Product Limits

Tool to get information about the limits and settings for a container's enabled products.

Get Container Roles

Tool to retrieve all access roles available to a container.

Get Container Template Details

Tool to get details about a template in a container.

Get Domain DCV Information

Tool to retrieve domain DCV (Domain Control Validation) information from DigiCert.

Get Domain DCV Emails

Tool to retrieve email addresses that receive validation emails from DigiCert for the email domain control validation (DCV) method.

Get Domain Expiration Count

Tool to get the number of domains in your account with expired or expiring OV or EV domain validations.

Get Domain Validation Type

Tool to list available validation types for domains.

Get Finance Balance

Tool to view the current balance of your DigiCert account.

Get Finance Balance History

Tool to list balance adjustment history for your DigiCert account.

Get Remote Service Information

Tool to retrieve remote service information from DigiCert Document Manager CSC API.

Get API Key Details

Tool to retrieve detailed information about an API key.

Get MPKI Version

Tool to query the TLM application version from DigiCert MPKI API.

Get Order Certificate Status Changes

Tool to list orders that changed status during a given time frame.

Get Organization Details

Tool to retrieve detailed information about an organization from DigiCert.

Get Organization Contact Info

Tool to retrieve organization and technical contact details for a specific organization.

Get Recent Organizations

Tool to retrieve the three most recently used organizations from your CertCentral account.

Get Organization Validation

Tool to get validation details for an organization.

Get Organization Validation Type

Tool to list available validation types for organizations.

Get Product by Name

Tool to get information about a product by its name identifier.

Get Product Platform Certificate Format Mapping

Tool to list the certificate format that is returned for a particular server platform.

Get Product Pricing

Tool to retrieve a comprehensive list of product prices available under your DigiCert account.

Get Remote Service Info

Tool to retrieve information about DigiCert's Document Manager CSC (Cloud Signature Consortium) remote service.

Get Order Report

Tool to retrieve a CSV report of all certificate orders.

Get Report Order Expiring

Tool to get the number of orders and certificates that expire within 0-30, 30-60, and 60-90 days from now.

Get Report Request Summary

Tool to get total requests and requests by type for your account.

Get Scan Subdomains

Tool to retrieve all subdomains included in a DigiCert Discovery scan.

Get User Details

Tool to retrieve details about a specific user in CertCentral.

Check Username Availability

Tool to check if a username is available in DigiCert.

List API Access Roles

Tool to retrieve a list of available API access roles.

List API Keys

Tool to retrieve a list of API keys and ACME URLs.

List Certificate Filter Values

Tool to retrieve available filter values for certificate attributes from DigiCert Discovery API.

List Certificate Orders

Tool to list all certificate orders in your DigiCert account.

List Certificates

Tool to list all certificates discovered by DigiCert Discovery scans.

List Containers

Tool to retrieve a list of all containers (divisions) in your DigiCert account.

List Container Templates

Tool to list all templates that can be used when creating containers.

List Domain DCV Methods

Tool to retrieve available domain control validation (DCV) methods for domains.

List Domains

Tool to list all domains in your CertCentral account.

List Intermediate Certificates

Tool to retrieve a list of intermediate certificates.

List Locales

Tool to retrieve a list of available locales.

List Organization Potential Approvers

Tool to list all users and contacts that can be validated as verified contacts (also called EV approvers).

List Organizations

Tool to retrieve all organizations in your DigiCert account.

List Permissions

Tool to list all permissions for the authenticated user.

List Available Products

Tool to list all products available to your CertCentral account.

List Sensors

Tool to list all sensors used for network scanning in DigiCert Discovery.

List Service Users

Tool to list all DigiCert service users (API-only users).

List CertCentral Users

Tool to retrieve a list of CertCentral account users.

Resend User Create Email

Tool to resend the create user email to a user.

Submit Domain for Validation

Tool to submit a domain for validation with specified validation types.

Update Account Emails

Tool to update account notification and emergency email addresses.

Update Container

Tool to edit a container's details including name and description.

Update Container Allowed Domain Names

Tool to update a container's allowed domains.

Update Container User Assignments

Tool to update a container's user assignments.

Activate Domain

Tool to activate a domain in DigiCert CertCentral.

Resend Domain DCV Emails

Tool to resend domain control validation (DCV) emails for a domain.

Update API Key

Tool to edit an API key's name or access role restrictions.

Update API Key Status

Tool to activate, deactivate, or revoke a DigiCert API key.

Update Notification Settings

Tool to update CertCentral account notification settings.

Update Organization

Tool to update an organization's details in your DigiCert CertCentral account.

Activate Organization

Tool to activate an organization in DigiCert CertCentral.

Update Organization Contact

Tool to update or replace organization contact and technical contact for an organization.

Deactivate Organization

Tool to deactivate an organization in DigiCert CertCentral.

Update Renewal Email Preference

Tool to enable or disable renewal notifications for SSL/TLS certificates discovered in DigiCert Discovery.

Update Report

Tool to update an existing report’s configuration.

Update User Profile

Tool to update a user's profile information in CertCentral.

Update User Container Assignments

Tool to update container (division) assignments for a user.

Update User Role

Tool to change a user's access role in CertCentral.

Validate VMC Encoded Logo

Tool to validate if an SVG file format is compatible with Verified Mark Certificate (VMC) or Common Mark Certificate (CMC) requirements.

Validate VMC/CMC Logo Format

Tool to validate SVG logo format for Verified Mark Certificates (VMC) or Common Mark Certificates (CMC).

Verify Template

Tool to verify a certificate template structure against DigiCert's validation rules.

FAQ

Frequently asked questions

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

Yes, you can. Vercel AI SDK v6 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 Digicert tools.

Yes, absolutely. You can configure which Digicert 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.

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 Digicert data and credentials are handled as safely as possible.

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