How to integrate Customgpt MCP with Codex

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Introduction

Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With Customgpt MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or the app, whichever you prefer.

Also integrate Customgpt 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 Customgpt MCP in Codex

Run the setup command

Run this command in your terminal to add the Composio MCP server to Codex.

Terminal

It will initiate the authentication in a browser window, authorize Codex to access your Composio account.

Composio authentication page

(Optional) Authenticate with OAuth

To authenticate manually, run the login command to open a browser window and authorize Codex to access your Composio account.

bash
codex mcp login composio

Verify the connection

Run codex mcp list to confirm Composio appears as a registered MCP server.

bash
codex mcp list

Codex App

Codex App follows the same approach as VS Code.

  1. Click ⚙️ on the bottom left → MCP Servers → + Add servers → Streamable HTTP:
  2. Fill the header and Key fields with { "x-consumer-api-key" = "ck_*******" }.
  3. The Key is the Composio API key, that you can find on dashboard.composio.dev
  4. Click on Authenticate and authorize Codex to your Composio account and you're all set.
Codex App MCP setup
  1. Restart and verify if it's there in .codex/config.toml
bash
[mcp_servers.composio]
url = "https://connect.composio.dev/mcp"
http_headers = { "x-consumer-api-key" = "ck_*******" }

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

The Customgpt MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your CustomGPT.ai account. It provides structured and secure access to your chatbot projects, so your agent can list, manage, update, and analyze your AI-powered chatbots and their licenses on your behalf.

  • Project and agent management: Effortlessly list all your CustomGPT projects, retrieve their details, and even delete agents you no longer need.
  • Comprehensive license handling: Let your agent fetch, update, or remove licenses attached to any of your chatbot projects, ensuring you always have the right access and compliance.
  • Chat conversation insights: Retrieve complete chat histories from your AI chatbot conversations to analyze user interactions or debug sessions.
  • User profile and usage monitoring: Automatically fetch your account profile and check on your usage limits, including agents, words, and queries, so you never exceed your quotas.
  • Project settings inspection: Quickly pull and review configuration details for any chatbot project to audit or adjust your bot's setup.

Supported Tools & Triggers

Tools
Activate Persona VersionRestore a previous persona version for a CustomGPT agent.
Add Source to ProjectAdd a data source to a CustomGPT agent's knowledge base.
Clone CustomGPT ProjectTool to clone a CustomGPT agent (project).
Create ConversationTool to create a new conversation session for a CustomGPT agent.
Create CustomGPT ProjectTool to create a new CustomGPT agent from a sitemap URL or file upload.
Delete Page from AgentTool to delete a document from a CustomGPT agent's knowledge base.
Delete CustomGPT ProjectTool to delete a CustomGPT project by ID.
Delete CustomGPT Project LicenseDeletes a license from a CustomGPT project/agent.
Delete CustomGPT SourceTool to delete a data source from a CustomGPT agent.
Export LeadsExport leads from a CustomGPT project.
Get MessageTool to get message details from a CustomGPT conversation.
Get Message Trust ScoreTool to retrieve verification trust score for a message in a CustomGPT conversation.
Get Page MetadataTool to get document metadata including title, source URL, word count, and custom metadata fields.
Get Agent PluginsTool to retrieve plugin details for a specific CustomGPT agent (project).
Get CustomGPT ProjectTool to get agent details.
Get Project LicenseTool to retrieve a license for a specific project.
Get Project SettingsRetrieve configuration settings for a specific CustomGPT agent/project.
Get Analytics Chart DataTool to retrieve analytics chart data for a CustomGPT project.
Get Conversation AnalyticsTool to get conversation analytics for a CustomGPT project.
Get Customer Intelligence ReportTool to get customer intelligence for a CustomGPT project.
Get Traffic Analytics ReportTool to retrieve traffic analytics for a CustomGPT agent/project.
Get Agent StatisticsTool to get agent statistics.
Get Usage LimitsGet account usage limits showing current usage vs.
Get Current User ProfileTool to retrieve the current user's profile information.
List Conversation MessagesRetrieves all messages from a CustomGPT conversation, including both user queries and AI responses.
List Agent DocumentsLists all documents in a CustomGPT agent's knowledge base.
List Persona VersionsTool to list persona versions for a CustomGPT agent.
List CustomGPT Project LicensesList all licenses for a CustomGPT project/agent.
List CustomGPT ProjectsLists all CustomGPT projects (agents) for the authenticated user.
List Agent SourcesTool to list all data sources connected to an agent.
Reindex PageTool to reindex a document in CustomGPT knowledge base.
Search Team MembersTool to search for team members by email address or user ID.
Submit Message FeedbackTool to submit feedback (thumbs up/down) for a message in a CustomGPT conversation.
Update Page MetadataUpdate document metadata for a specific page in a CustomGPT project.
Update ProjectUpdates an existing CustomGPT agent's name or configuration settings.
Update Project LicenseUpdates the name of an existing license for a CustomGPT project/agent.
Update Project SettingsUpdate CustomGPT agent configuration settings.
Update Source SettingsUpdate source settings for a CustomGPT agent data source.
Update User ProfileUpdates the authenticated user's profile information in CustomGPT.
Verify Message AccuracyTool to verify message accuracy by triggering a fact-checking verification process.

Conclusion

You've successfully integrated Customgpt with Codex using Composio's MCP server. Now you can interact with Customgpt 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 Customgpt 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 Customgpt operations
  • Explore cross-app workflows by connecting more toolkits
  • Build automation scripts that leverage Codex's AI capabilities

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FAQ

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

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

Can I use Tool Router MCP with Codex?

Yes, you can. Codex 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 Customgpt tools.

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

Yes, absolutely. You can configure which Customgpt 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 Customgpt data and credentials are handled as safely as possible.

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