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How to connect Captions to Claude

Connect Claude Web, Desktop and Cowork to Captions MCP. Generate narrated product demo video, add styled captions to your video, and more using natural language, with authentication handled for you.

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Captions provides the Mirage API for generating videos, speech, and styled captions. Use it to automate polished video creation, voiceovers, and captioning from one API.

8 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Captions account to Claude via Composio Connect, enabling it to generate narrated product demo video, add styled captions to your video, create voiceover for training clip, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate Captions with

ChatGPTHermesAtomic Agent

Connecting Captions to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your Captions account

Back in Claude, ask it to connect to Captions or give it any Captions-related task.

For example, ask Claude to:

  • "Generate narrated product demo video"
  • "Add styled captions to your video"
  • "Create voiceover for training clip"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Captions account is ready to use.

What is the Captions Claude Connector, and what's possible with it?

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

Troubleshooting

1. Why does Claude not use the Composio connector for Captions?

The connector can show as connected, but Claude must use it in each Captions conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Captions again.

2. Why does Claude show an MCP server error before Captions connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Captions.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Captions.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Captions authorization link not work?

The Composio connector is one server. Your Captions account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Captions connection.
  • Composio creates a fresh Captions authorization link.
  • Open that link in your browser and finish the Captions sign-in.

4. Why do Captions actions fail after they worked before?

The Captions connection can expire or lose permission.

  • Ask Claude to inspect the Captions connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Captions account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Captions.
  • If the action still fails with a permission error, check that the connected account has that permission in Captions itself.

5. How do I switch to a different Captions account?

Claude can manage the Captions connection for you.

  • Ask Claude to disconnect or delete the current Captions account.
  • Ask Claude to connect Captions again.
  • Open the new Composio authorization link for Captions.
  • Sign in with the other Captions account in the browser.
  • After the account connects, ask Claude to retry the Captions task.

6. Why is my Captions connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Captions connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Captions tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Captions.
TOOLS

Supported Tools

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

Add Captions

Start an asynchronous job that transcribes and renders a selected caption style onto an uploaded or existing completed video.

Download Video

Download the MP4 content of a completed video job and return an offloaded file reference.

Generate Speech

Generate WAV speech synchronously from text using a known Mirage voice ID and return an offloaded audio file reference.

Generate Video

Start an asynchronous Mirage Video 1 job that animates a portrait image using speech audio.

Get Caption Template

Retrieve one caption style by ID, including its name and preview video URL.

Get Video Status

Retrieve the current state, progress, and error details for a video generation or captioning job.

List Caption Templates

Return one page of available caption styles, including names and preview video URLs.

List Videos

Return one page of video jobs owned by the connected Mirage account, including each job's status and progress.

FRAMEWORKS

How to build Captions MCP Agent with another framework

ChatGPT logo

ChatGPT

Use Captions MCP with ChatGPT

Hermes logo

Hermes

Use Captions MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Captions MCP with Atomic Agent

FAQ

Frequently asked questions

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

Yes, you can. Claude Cowork 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 Captions tools.

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

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