How to integrate RedCircle API 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 RedCircle API MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or app, whichever you prefer.

Composio removes the Authentication handling completely from you. We handle the entire integration lifecycle, and all you need to do is just copy the URL below, authenticate inside Codex, and start using it.

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 870+ 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 RedCircle API MCP in Codex

Codex CLI

Run the command in your terminal.

Terminal

This will auto-redirect you to the Rube authentication page.

Rube authentication redirect page

Once you're authenticated, you will be able to access the tools.

Verify the installation by running:

codex mcp list

If you otherwise prefer to use config.toml, add the following URL to it. You can get the bearer token from rube.app → Use Rube → MCP URL → Generate token

[projects."/home/user/composio"]
trust_level = "untrusted"

[mcp_servers.rube]
bearer_token_env_var = "your bearer token"
enabled = true
url = "https://rube.app/mcp"

Codex in VS Code

If you have installed Codex in VS Code.

Then: ⚙️ → MCP Settings → + Add servers → Streamable HTTP:

Add the Rube MCP URL: https://rube.app/mcp and the bearer token.

VS Code MCP Settings

To verify, click on the Open config.toml

Open config toml in Codex

Make sure it's there:

[mcp_servers.composio_rube]
bearer_token_env_var = "your bearer token"
enabled = true
url = "https://rube.app/mcp"

Codex App

Codex App follows the same approach as VS Code.

  1. Click ⚙️ on the bottom left → MCP Servers → + Add servers → Streamable HTTP:
Codex App MCP Settings
  1. Restart and verify if it's there in .codex/config.toml
[mcp_servers.composio_rube]
bearer_token_env_var = "your bearer token"
enabled = true
url = "https://rube.app/mcp"
  1. Save, restart the extension, and start working.

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

The RedCircle API MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your RedCircle API account. It provides structured and secure access so your agent can perform RedCircle API operations on your behalf.

Supported Tools & Triggers

Tools
Add ZipcodesTool to add zipcodes to your RedCircle API account for geolocation targeting.
Clear Collection RequestsTool to remove all requests from a specified collection.
Create CollectionTool to create a new collection for running up to 15,000 requests on a schedule.
Create DestinationTool to create a new destination for uploading Collection Result Sets to cloud storage.
Create RequestsTool to add up to 1,000 requests to an existing collection.
Delete CollectionTool to remove a collection from the system by ID.
Delete DestinationTool to remove a destination from your RedCircle API account.
Delete Request from CollectionTool to remove an individual request from a collection.
Delete Requests In BulkTool to delete multiple requests from a collection in bulk.
Delete ZipcodesTool to remove zipcodes from your RedCircle API account.
Get Account InformationTool to retrieve account information, usage metrics, and platform status.
Get CollectionTool to retrieve complete information about a specific collection.
Get Requests CSV LinksTool to retrieve CSV download links for all requests in a collection.
Get Requests JSON LinksTool to retrieve download links for all requests in a collection in JSON format.
Get Result Set CSVTool to retrieve a result set in CSV format with optional field filtering.
Get Result Set JSONTool to retrieve a result set in JSON format with download links.
Get Result Set JSON LinesTool to retrieve a result set in JSON Lines format with download links.
Get Target Product DataTool to retrieve Target data in real-time including search results, product information, reviews, or category listings.
List CategoriesTool to retrieve all top-level (root) categories or filter results using optional parameters.
List CollectionsTool to retrieve all collections configured on your RedCircle API account with filtering and pagination.
List DestinationsTool to retrieve all destinations configured on your RedCircle API account with pagination and filtering.
List Error LogsTool to list all error logs on your RedCircle API account.
List Requests by PageTool to retrieve requests for a collection in paginated format.
List Result SetsTool to list all result sets for a collection.
List ZipcodesTool to retrieve all zipcodes associated with your account with optional filtering.
Resend WebhookTool to resend a previously configured webhook POST request for a result set.
Start CollectionTool to initiate execution of a RedCircle API collection.
Stop All CollectionsTool to halt all currently active collections on your account.
Stop CollectionTool to halt an active collection in queued or running state.
Update CollectionTool to update an existing collection's configuration and settings.
Update DestinationTool to modify an existing destination configuration on your RedCircle API account.
Update RequestTool to modify a request within a collection.

Conclusion

You've successfully integrated RedCircle API with Codex using Composio's Rube MCP server. Now you can interact with RedCircle API 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 RedCircle API operations
  • Managed authentication through Composio's Rube
  • Access to 20,000+ tools across 870+ apps for cross-app workflows
  • CodeAct workbench for complex tool chaining

Next steps:

  • Try asking Codex to perform various RedCircle API operations
  • Explore cross-app workflows by connecting more toolkits
  • Build automation scripts that leverage Codex's AI capabilities

How to build RedCircle API MCP Agent with another framework

OpenAI Agents SDK

OpenAI Agents SDK

Use RedCircle API MCP with OpenAI Agents SDK

Claude Agent SDK

Claude Agent SDK

Use RedCircle API MCP with Claude Agent SDK

Google ADK

Google ADK

Use RedCircle API MCP with Google ADK

LangChain

LangChain

Use RedCircle API MCP with LangChain

Vercel AI SDK

Vercel AI SDK

Use RedCircle API MCP with Vercel AI SDK

Mastra AI

Mastra AI

Use RedCircle API MCP with Mastra AI

LlamaIndex

LlamaIndex

Use RedCircle API MCP with LlamaIndex

CrewAI

CrewAI

Use RedCircle API MCP with CrewAI

Claude Code

Claude Code

Use RedCircle API MCP with Claude Code

FAQ

What are the differences in Tool Router MCP and RedCircle API MCP?

With a standalone RedCircle API MCP server, the agents and LLMs can only access a fixed set of RedCircle API tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from RedCircle API 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 RedCircle API tools.

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

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

Used by agents from

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HubSpot
Agent.ai
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DataStax
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Context
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HubSpot
Agent.ai
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Entelligence
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