How to integrate Digicert MCP with LlamaIndex

This guide walks you through connecting Digicert to LlamaIndex 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 LlamaIndex 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.

Digicert logoDigicert
Api Key

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 LlamaIndex 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 LlamaIndex 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.

Also integrate Digicert with

TL;DR

Here's what you'll learn:
  • Set your OpenAI and Composio API keys
  • Install LlamaIndex and Composio packages
  • Create a Composio Tool Router session for Digicert
  • Connect LlamaIndex to the Digicert MCP server
  • Build a Digicert-powered agent using LlamaIndex
  • Interact with Digicert through natural language

What is LlamaIndex?

LlamaIndex is a data framework for building LLM applications. It provides tools for connecting LLMs to external data sources and services through agents and tools.

Key features include:

  • ReAct Agent: Reasoning and acting pattern for tool-using agents
  • MCP Tools: Native support for Model Context Protocol
  • Context Management: Maintain conversation context across interactions
  • Async Support: Built for async/await patterns

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 step10 STEPS
1

Prerequisites

Before you begin, make sure you have:
  • Python 3.8/Node 16 or higher installed
  • A Composio account with the API key
  • An OpenAI API key
  • A Digicert account and project
  • Basic familiarity with async Python/Typescript
2

Getting API Keys for OpenAI, Composio, and Digicert

OpenAI API key (OPENAI_API_KEY)
  • Go to the OpenAI dashboard
  • Create an API key if you don't have one
  • Assign it to OPENAI_API_KEY in .env
Composio API key and user ID
  • Log into the Composio dashboard
  • Copy your API key from Settings
    • Use this as COMPOSIO_API_KEY
  • Pick a stable user identifier (email or ID)
    • Use this as COMPOSIO_USER_ID
3

Installing dependencies

npm install @composio/llamaindex @llamaindex/openai @llamaindex/tools @llamaindex/workflow dotenv

Create a new Typescript project and install the necessary dependencies:

  • @composio/llamaindex: Composio's LlamaIndex integration
  • @llamaindex/openai: OpenAI LLM integration
  • @llamaindex/tools: MCP client for LlamaIndex
  • @llamaindex/workflow: Workflow framework for LlamaIndex
  • dotenv: Environment variable management
4

Set environment variables

bash
OPENAI_API_KEY=your-openai-api-key
COMPOSIO_API_KEY=your-composio-api-key
COMPOSIO_USER_ID=your-user-id

Create a .env file in your project root:

These credentials will be used to:

  • Authenticate with OpenAI's GPT-5 model
  • Connect to Composio's Tool Router
  • Identify your Composio user session for Digicert access
5

Import modules

import "dotenv/config";
import readline from "node:readline/promises";
import { stdin as input, stdout as output } from "node:process";

import { Composio } from "@composio/core";

import { mcp } from "@llamaindex/tools";
import { agent as createAgent } from "@llamaindex/workflow";
import { openai } from "@llamaindex/openai";

dotenv.config();

Create a new file called digicert_llamaindex_agent.ts and import the required modules:

Key imports:

  • dotenv.config loads .env at runtime
  • readline gives us a simple CLI chat loop
  • Composio is the main Composio SDK client
  • mcp connects to an MCP endpoint
  • createAgent builds a LlamaIndex agent
  • openai configures the LLM backend
6

Load environment variables and initialize Composio

const OPENAI_API_KEY = process.env.OPENAI_API_KEY;
const COMPOSIO_API_KEY = process.env.COMPOSIO_API_KEY;
const COMPOSIO_USER_ID = process.env.COMPOSIO_USER_ID;

if (!OPENAI_API_KEY) throw new Error("OPENAI_API_KEY is not set");
if (!COMPOSIO_API_KEY) throw new Error("COMPOSIO_API_KEY is not set");
if (!COMPOSIO_USER_ID) throw new Error("COMPOSIO_USER_ID is not set");

What's happening:

This ensures missing credentials cause early, clear errors before the agent attempts to initialise.

7

Create a Tool Router session and build the agent function

async function buildAgent() {

  console.log(`Initializing Composio client...${COMPOSIO_USER_ID!}...`);
  console.log(`COMPOSIO_USER_ID: ${COMPOSIO_USER_ID!}...`);

  const composio = new Composio({
    apiKey: COMPOSIO_API_KEY,
    provider: new LlamaindexProvider(),
  });

  const session = await composio.create(
    COMPOSIO_USER_ID!,
    {
      toolkits: ["digicert"],
    },
  );

  const mcpUrl = session.mcp.url;
  console.log(`Composio Tool Router MCP URL: ${mcpUrl}`);

  const server = mcp({
    url: mcpUrl,
    clientName: "composio_tool_router_with_llamaindex",
    requestInit: {
      headers: {
        "x-api-key": COMPOSIO_API_KEY!,
      },
    },
    // verbose: true,
  });

  const tools = await server.tools();

  const llm = openai({ apiKey: OPENAI_API_KEY, model: "gpt-5" });

  const agent = createAgent({
    name: "composio_tool_router_with_llamaindex",
        description : "An agent that uses Composio Tool Router MCP tools to perform actions.",
    systemPrompt:
      "You are a helpful assistant connected to Composio Tool Router."+
"Use the available tools to answer user queries and perform Digicert actions." ,
    llm,
    tools,
  });

  return agent;
}

What's happening here:

  • We create a Composio client using your API key and configure it with the LlamaIndex provider
  • We then create a tool router MCP session for your user, specifying the toolkits we want to use (in this case, digicert)
  • The session returns an MCP HTTP endpoint URL that acts as a gateway to all your configured tools
  • LlamaIndex will connect to this endpoint to dynamically discover and use the available Digicert tools.
  • The MCP tools are mapped to LlamaIndex-compatible tools and plug them into the Agent.
8

Create an interactive chat loop

async function chatLoop(agent: ReturnType<typeof createAgent>) {
  const rl = readline.createInterface({ input, output });

  console.log("Type 'quit' or 'exit' to stop.");

  while (true) {
    let userInput: string;

    try {
      userInput = (await rl.question("\nYou: ")).trim();
    } catch {
      console.log("\nAgent: Bye!");
      break;
    }

    if (!userInput) {
      continue;
    }

    const lower = userInput.toLowerCase();
    if (lower === "quit" || lower === "exit") {
      console.log("Agent: Bye!");
      break;
    }

    try {
      process.stdout.write("Agent: ");

      const stream = agent.runStream(userInput);
      let finalResult: any = null;

      for await (const event of stream) {
        // The event.data contains the streamed content
        const data: any = event.data;

        // Check for streaming delta content
        if (data?.delta) {
          process.stdout.write(data.delta);
        }

        // Store final result for fallback
        if (data?.result || data?.message) {
          finalResult = data;
        }
      }

      // If no streaming happened, show the final result
      if (finalResult) {
        const answer =
          finalResult.result ??
          finalResult.message?.content ??
          finalResult.message ??
          "";
        if (answer && typeof answer === "string" && !answer.includes("[object")) {
          process.stdout.write(answer);
        }
      }

      console.log(); // New line after streaming completes
    } catch (err: any) {
      console.error("\nAgent error:", err?.message ?? err);
    }
  }

  rl.close();
}

What's happening:

  • We're creating a direct terminal interface to chat with Digicert
  • The LLM's responses are streamed to the CLI for faster interaction.
  • The agent uses context to maintain conversation history
  • The agent processes the request, selects appropriate Digicert tools, and returns a result
  • We extract the answer from the result data structure and display it to the user
  • You can type 'quit' or 'exit' to stop the chat loop gracefully
  • Agent responses and any errors are streamed in a clear, readable format
9

Define the main entry point

async function main() {
  try {
    const agent = await buildAgent();
    await chatLoop(agent);
  } catch (err) {
    console.error("Failed to start agent:", err);
    process.exit(1);
  }
}

main();

What's happening here:

  • We're orchestrating the entire application flow
  • The agent gets built with proper error handling
  • Then we kick off the interactive chat loop so you can start talking to Digicert
10

Run the agent

npx ts-node llamaindex-agent.ts

When prompted, authenticate and authorise your agent with Digicert, then start asking questions.

Complete Code

Here's the complete code to get you started with Digicert and LlamaIndex:

import "dotenv/config";
import readline from "node:readline/promises";
import { stdin as input, stdout as output } from "node:process";

import { Composio } from "@composio/core";
import { LlamaindexProvider } from "@composio/llamaindex";

import { mcp } from "@llamaindex/tools";
import { agent as createAgent } from "@llamaindex/workflow";
import { openai } from "@llamaindex/openai";

dotenv.config();

const OPENAI_API_KEY = process.env.OPENAI_API_KEY;
const COMPOSIO_API_KEY = process.env.COMPOSIO_API_KEY;
const COMPOSIO_USER_ID = process.env.COMPOSIO_USER_ID;

if (!OPENAI_API_KEY) {
    throw new Error("OPENAI_API_KEY is not set in the environment");
  }
if (!COMPOSIO_API_KEY) {
    throw new Error("COMPOSIO_API_KEY is not set in the environment");
  }
if (!COMPOSIO_USER_ID) {
    throw new Error("COMPOSIO_USER_ID is not set in the environment");
  }

async function buildAgent() {

  console.log(`Initializing Composio client...${COMPOSIO_USER_ID!}...`);
  console.log(`COMPOSIO_USER_ID: ${COMPOSIO_USER_ID!}...`);

  const composio = new Composio({
    apiKey: COMPOSIO_API_KEY,
    provider: new LlamaindexProvider(),
  });

  const session = await composio.create(
    COMPOSIO_USER_ID!,
    {
      toolkits: ["digicert"],
    },
  );

  const mcpUrl = session.mcp.url;
  console.log(`Composio Tool Router MCP URL: ${mcpUrl}`);

  const server = mcp({
    url: mcpUrl,
    clientName: "composio_tool_router_with_llamaindex",
    requestInit: {
      headers: {
        "x-api-key": COMPOSIO_API_KEY!,
      },
    },
    // verbose: true,
  });

  const tools = await server.tools();

  const llm = openai({ apiKey: OPENAI_API_KEY, model: "gpt-5" });

  const agent = createAgent({
    name: "composio_tool_router_with_llamaindex",
    description:
      "An agent that uses Composio Tool Router MCP tools to perform actions.",
    systemPrompt:
      "You are a helpful assistant connected to Composio Tool Router."+
"Use the available tools to answer user queries and perform Digicert actions." ,
    llm,
    tools,
  });

  return agent;
}

async function chatLoop(agent: ReturnType<typeof createAgent>) {
  const rl = readline.createInterface({ input, output });

  console.log("Type 'quit' or 'exit' to stop.");

  while (true) {
    let userInput: string;

    try {
      userInput = (await rl.question("\nYou: ")).trim();
    } catch {
      console.log("\nAgent: Bye!");
      break;
    }

    if (!userInput) {
      continue;
    }

    const lower = userInput.toLowerCase();
    if (lower === "quit" || lower === "exit") {
      console.log("Agent: Bye!");
      break;
    }

    try {
      process.stdout.write("Agent: ");

      const stream = agent.runStream(userInput);
      let finalResult: any = null;

      for await (const event of stream) {
        // The event.data contains the streamed content
        const data: any = event.data;

        // Check for streaming delta content
        if (data?.delta) {
          process.stdout.write(data.delta);
        }

        // Store final result for fallback
        if (data?.result || data?.message) {
          finalResult = data;
        }
      }

      // If no streaming happened, show the final result
      if (finalResult) {
        const answer =
          finalResult.result ??
          finalResult.message?.content ??
          finalResult.message ??
          "";
        if (answer && typeof answer === "string" && !answer.includes("[object")) {
          process.stdout.write(answer);
        }
      }

      console.log(); // New line after streaming completes
    } catch (err: any) {
      console.error("\nAgent error:", err?.message ?? err);
    }
  }

  rl.close();
}

async function main() {
  try {
    const agent = await buildAgent();
    await chatLoop(agent);
  } catch (err: any) {
    console.error("Failed to start agent:", err?.message ?? err);
    process.exit(1);
  }
}

main();

Conclusion

You've successfully connected Digicert to LlamaIndex through Composio's Tool Router MCP layer. Key takeaways:
  • Tool Router dynamically exposes Digicert tools through an MCP endpoint
  • LlamaIndex's ReActAgent handles reasoning and orchestration; Composio handles integrations
  • The agent becomes more capable without increasing prompt size
  • Async Python provides clean, efficient execution of agent workflows
You can easily extend this to other toolkits like Gmail, Notion, Stripe, GitHub, and more by adding them to the toolkits parameter.
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. LlamaIndex 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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