How to integrate Inworld AI MCP with Codex

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

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Api Key

Inworld AI is a native AI platform for speech synthesis, speech recognition, voice management, model discovery, embeddings, knowledge, and routing. Use it to build responsive voice and knowledge experiences without stitching together separate AI infrastructure.

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Introduction

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

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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 Inworld AI 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 Inworld AI MCP server, and what's possible with it?

The Inworld AI MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Inworld AI account. It provides structured and secure access to speech, voices, models, and embeddings, so your agent can synthesize speech, transcribe audio, explore voices, compare models, and create text embeddings on your behalf.

  • Speech synthesis: Have your agent turn short text into spoken audio using an available Inworld voice.
  • Audio transcription: Direct your agent to transcribe short audio files and return the final text with timestamps and usage details.
  • Voice discovery and previews: Let the agent browse available voices by language or other preferences and generate MP3 previews before you choose one.
  • Model comparison: Instruct your agent to list supported models and compare their pricing, modalities, context sizes, and output limits.
  • Text embeddings: Have your agent generate a complete embedding vector for each text input using an Inworld-hosted model.

Conclusion

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

Supported Tools

Every Inworld AI action and event your agent gets out of the box.

Create Embeddings

Generate one complete embedding vector per input text with an Inworld-hosted embedding model.

Get Voice Preview

Generate the provider-selected, unmetered MP3 preview for a voice and return it as a downloadable file.

List Models

List Inworld-supported models and the pricing, modality, context, and output limits needed to choose a model.

List Voices

Return one page of voices available for preview or speech synthesis, with optional filtering, language selection, and sorting.

Synthesize Speech

Synthesize short text with an Inworld voice and return the complete audio as a downloadable file.

Transcribe Audio

Synchronously transcribe a short audio file and return the final transcript, timestamps, and usage.

FAQ

Frequently asked questions

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

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 Inworld AI tools.

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

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