How to integrate Digicert MCP with Pydantic AI

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Introduction

This guide walks you through connecting Digicert to Pydantic AI 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 Pydantic AI 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:
  • How to set up your Composio API key and User ID
  • How to create a Composio Tool Router session for Digicert
  • 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 Digicert 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 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.

Supported Tools & Triggers

Tools
Add Tags to CertificateTool to add custom tags to one or more certificates for categorization.
Check PermissionTool to check if a specific permission is available.
Create API KeyTool to create a new API key with specified permissions.
Create AuthKeyTool to create a new AuthKey for account authentication.
Create Container IP RulesTool to add an IP restriction rule to a CertCentral account.
Create Finance Order PricingTool to get price estimates for a certificate order.
Create OrganizationTool to create a new organization in your DigiCert CertCentral account.
Create Organization ValidationTool to submit an organization for validation and add verified contacts for specific product types.
List Scan TemplatesTool to retrieve the list of scan templates along with their name, status, and configuration.
Delete Account AuthKeyTool to delete your account's AuthKey.
Delete Certificate from DiscoveryTool to delete certificates from DigiCert Discovery inventory.
Delete DomainTool to delete a domain with the given ID.
Delete SSH KeyTool to delete SSH keys from DigiCert Discovery.
Delete Discovery EndpointsTool to delete one or more endpoints from the Discovery API.
Execute GraphQL QueryTool to execute GraphQL queries against DigiCert Custom Reports API.
Filter KeysTool to filter keys in DigiCert Discovery API by various criteria.
Get Account DetailsTool to retrieve details about your CertCentral account.
Get Account DetailsTool to retrieve account details for the authenticated user.
Get Account Guest Access URLTool to retrieve the guest access URL for your DigiCert account.
Get Account MetadataTool to retrieve metadata for custom order fields in the account.
Get Account SAML EntityTool to retrieve SAML entity details for your account.
Get Agent IP Port DetailsTool to retrieve agent IP port details from DigiCert Discovery API.
Get Alert CountTool to retrieve alert count from DigiCert Discovery API dashboard.
Get AuthKey DetailsTool to retrieve AuthKey details by ID.
List Authorized ContainersTool to list all containers authorized to perform a permission action.
Get Certificate Authority HelperTool to retrieve certificate authority API helper information including version details.
Get Certificate Security RatingTool to retrieve SSL certificate security rating from DigiCert Discovery API.
Get Cloud Scan DetailsTool to get cloud scan details from DigiCert Discovery API.
Get Container by IDTool to get details about a specific container using its ID.
Get Container ChildrenTool to list all child containers for a parent container.
Get Container IP RulesTool to retrieve a list of existing IP restriction rules in a CertCentral account.
Get Container Order OrganizationsTool to list all organizations assigned to a container.
Get Container Product LimitsTool to get information about the limits and settings for a container's enabled products.
Get Container RolesTool to retrieve all access roles available to a container.
Get Container Template DetailsTool to get details about a template in a container.
Get Domain DCV InformationTool to retrieve domain DCV (Domain Control Validation) information from DigiCert.
Get Domain DCV EmailsTool to retrieve email addresses that receive validation emails from DigiCert for the email domain control validation (DCV) method.
Get Domain Expiration CountTool to get the number of domains in your account with expired or expiring OV or EV domain validations.
Get Domain Validation TypeTool to list available validation types for domains.
Get Finance BalanceTool to view the current balance of your DigiCert account.
Get Finance Balance HistoryTool to list balance adjustment history for your DigiCert account.
Get Remote Service InformationTool to retrieve remote service information from DigiCert Document Manager CSC API.
Get API Key DetailsTool to retrieve detailed information about an API key.
Get MPKI VersionTool to query the TLM application version from DigiCert MPKI API.
Get Order Certificate Status ChangesTool to list orders that changed status during a given time frame.
Get Organization DetailsTool to retrieve detailed information about an organization from DigiCert.
Get Organization Contact InfoTool to retrieve organization and technical contact details for a specific organization.
Get Recent OrganizationsTool to retrieve the three most recently used organizations from your CertCentral account.
Get Organization ValidationTool to get validation details for an organization.
Get Organization Validation TypeTool to list available validation types for organizations.
Get Product by NameTool to get information about a product by its name identifier.
Get Product Platform Certificate Format MappingTool to list the certificate format that is returned for a particular server platform.
Get Product PricingTool to retrieve a comprehensive list of product prices available under your DigiCert account.
Get Remote Service InfoTool to retrieve information about DigiCert's Document Manager CSC (Cloud Signature Consortium) remote service.
Get Order ReportTool to retrieve a CSV report of all certificate orders.
Get Report Order ExpiringTool to get the number of orders and certificates that expire within 0-30, 30-60, and 60-90 days from now.
Get Report Request SummaryTool to get total requests and requests by type for your account.
Get Scan SubdomainsTool to retrieve all subdomains included in a DigiCert Discovery scan.
Get User DetailsTool to retrieve details about a specific user in CertCentral.
Check Username AvailabilityTool to check if a username is available in DigiCert.
List API Access RolesTool to retrieve a list of available API access roles.
List API KeysTool to retrieve a list of API keys and ACME URLs.
List Certificate Filter ValuesTool to retrieve available filter values for certificate attributes from DigiCert Discovery API.
List Certificate OrdersTool to list all certificate orders in your DigiCert account.
List CertificatesTool to list all certificates discovered by DigiCert Discovery scans.
List ContainersTool to retrieve a list of all containers (divisions) in your DigiCert account.
List Container TemplatesTool to list all templates that can be used when creating containers.
List Domain DCV MethodsTool to retrieve available domain control validation (DCV) methods for domains.
List DomainsTool to list all domains in your CertCentral account.
List Intermediate CertificatesTool to retrieve a list of intermediate certificates.
List LocalesTool to retrieve a list of available locales.
List Organization Potential ApproversTool to list all users and contacts that can be validated as verified contacts (also called EV approvers).
List OrganizationsTool to retrieve all organizations in your DigiCert account.
List PermissionsTool to list all permissions for the authenticated user.
List Available ProductsTool to list all products available to your CertCentral account.
List SensorsTool to list all sensors used for network scanning in DigiCert Discovery.
List Service UsersTool to list all DigiCert service users (API-only users).
List CertCentral UsersTool to retrieve a list of CertCentral account users.
Resend User Create EmailTool to resend the create user email to a user.
Submit Domain for ValidationTool to submit a domain for validation with specified validation types.
Update Account EmailsTool to update account notification and emergency email addresses.
Update ContainerTool to edit a container's details including name and description.
Update Container Allowed Domain NamesTool to update a container's allowed domains.
Update Container User AssignmentsTool to update a container's user assignments.
Activate DomainTool to activate a domain in DigiCert CertCentral.
Resend Domain DCV EmailsTool to resend domain control validation (DCV) emails for a domain.
Update API KeyTool to edit an API key's name or access role restrictions.
Update API Key StatusTool to activate, deactivate, or revoke a DigiCert API key.
Update Notification SettingsTool to update CertCentral account notification settings.
Update OrganizationTool to update an organization's details in your DigiCert CertCentral account.
Activate OrganizationTool to activate an organization in DigiCert CertCentral.
Update Organization ContactTool to update or replace organization contact and technical contact for an organization.
Deactivate OrganizationTool to deactivate an organization in DigiCert CertCentral.
Update Renewal Email PreferenceTool to enable or disable renewal notifications for SSL/TLS certificates discovered in DigiCert Discovery.
Update ReportTool to update an existing report’s configuration.
Update User ProfileTool to update a user's profile information in CertCentral.
Update User Container AssignmentsTool to update container (division) assignments for a user.
Update User RoleTool to change a user's access role in CertCentral.
Validate VMC Encoded LogoTool to validate if an SVG file format is compatible with Verified Mark Certificate (VMC) or Common Mark Certificate (CMC) requirements.
Validate VMC/CMC Logo FormatTool to validate SVG logo format for Verified Mark Certificates (VMC) or Common Mark Certificates (CMC).
Verify TemplateTool to verify a certificate template structure against DigiCert's validation rules.

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 Digicert
  • 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 Digicert
  • MCPServerStreamableHTTP connects to the Digicert 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 Digicert
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["digicert"],
    )
    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 Digicert 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
digicert_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
agent = Agent(
    "openai:gpt-5",
    toolsets=[digicert_mcp],
    instructions=(
        "You are a Digicert assistant. Use Digicert tools to help users "
        "with their requests. Ask clarifying questions when needed."
    ),
)
What's happening:
  • The MCP client connects to the Digicert endpoint
  • The agent uses GPT-5 to interpret user commands and perform Digicert 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 Digicert.\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
  • Digicert 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 Digicert 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 Digicert
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["digicert"],
    )
    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
    digicert_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
    agent = Agent(
        "openai:gpt-5",
        toolsets=[digicert_mcp],
        instructions=(
            "You are a Digicert assistant. Use Digicert 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 Digicert.\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 Digicert through Composio's Tool Router. With this setup, your agent can perform real Digicert 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 + Digicert 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 Digicert MCP?

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.

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 Digicert tools.

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

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.

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 Digicert data and credentials are handled as safely as possible.

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