Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With Certifier MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or the app, whichever you prefer.
- Builders & DevelopersCOMPOSIOFOR YOUGive Claude, codex, or any harness secure access to 1000+ tools
## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.
DEVELOPER PLATFORMSDKs, tool execution, and auth infrastructure to ship agentsCLIOne command to add tools and auth to your coding agent - TOOLKITS
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How to integrate Certifier MCP with Codex
Connect Codex to Certifier MCP. Create and send a certificate for webinar attendees, list all credential designs available to your team, and more using natural language, with authentication handled for you.
Certifier is a platform for creating, managing, and issuing digital certificates and credentials. Organizations use it to automate and secure the entire credentialing process.
Introduction
Also integrate Certifier with
Why use Composio?
Apart from a managed and hosted MCP server, you will get:
- CodeAct: A dedicated workbench that allows GPT to write its code to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
- Large tool responses: Handle them to minimise context rot.
- Dynamic just-in-time access to 20,000 tools across 1000+ other Apps for cross-app workflows. It loads the tools you need, so GPTs aren't overwhelmed by tools you don't need.
How to install Certifier MCP in Codex
Run the setup command
Run this command in your terminal to add the Composio MCP server to Codex.
It will initiate the authentication in a browser window, authorize Codex to access your Composio account.

(Optional) Authenticate with OAuth
To authenticate manually, run the login command to open a browser window and authorize Codex to access your Composio account.
codex mcp login composioVerify the connection
Run codex mcp list to confirm Composio appears as a registered MCP server.
codex mcp listCodex App
Codex App follows the same approach as VS Code.
- Click ⚙️ on the bottom left → MCP Servers → + Add servers → Streamable HTTP:
- Fill the header and Key fields with
{ "x-consumer-api-key" = "ck_*******" }. - The Key is the Composio API key, that you can find on dashboard.composio.dev
- Click on Authenticate and authorize Codex to your Composio account and you're all set.
- Restart and verify if it's there in
.codex/config.toml
[mcp_servers.composio]
url = "https://connect.composio.dev/mcp"
http_headers = { "x-consumer-api-key" = "ck_*******" }What is the Certifier MCP server, and what's possible with it?
The Certifier MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Certifier account. It provides structured and secure access to your digital credential management, so your agent can create, issue, send, and organize certificates and credentials on your behalf.
- Instant credential creation and issuing: Instruct your agent to create, issue, and send new digital certificates or badges to recipients in a single seamless workflow.
- Automated credential delivery: Have your agent send published credentials directly to recipients via email with just a simple command.
- Credential activity insights: Let the agent retrieve and summarize interaction events—like views or downloads—for any issued credential.
- Design and template management: Ask your agent to list available certificate or badge designs, making it easy to select and use templates for new credentials.
- Group and recipient organization: Enable your agent to fetch and organize groups of recipients, streamlining large-scale credential distribution.
Conclusion
You've successfully integrated Certifier with Codex using Composio's MCP server. Now you can interact with Certifier directly from your terminal, VS Code, or the Codex App using natural language commands.
Key benefits of this setup:
- Seamless integration across CLI, VS Code, and standalone app
- Natural language commands for Certifier operations
- Managed authentication through Composio
- Access to 20,000+ tools across 1000+ apps for cross-app workflows
- CodeAct workbench for complex tool chaining
Next steps:
- Try asking Codex to perform various Certifier operations
- Explore cross-app workflows by connecting more toolkits
- Build automation scripts that leverage Codex's AI capabilities
Supported Tools
Every Certifier action and event your agent gets out of the box.
How to build Certifier MCP Agent with another framework
OpenAI Agents SDK
Use Certifier MCP with OpenAI Agents SDK
Claude Agent SDK
Use Certifier MCP with Claude Agent SDK
Claude Code
Use Certifier MCP with Claude Code
Claude Cowork
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Hermes
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Google ADK
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LangChain
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Vercel AI SDK
Use Certifier MCP with Vercel AI SDK
Mastra AI
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LlamaIndex
Use Certifier MCP with LlamaIndex
CrewAI
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Pydantic AI
Use Certifier MCP with Pydantic AI
AutoGen
Use Certifier MCP with AutoGen
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Frequently asked questions
Start with Certifier.It takes 30 seconds.
Managed auth, hosted MCP servers, and every Certifier tool your agent needs.Free to start.
## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.Start building
