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How to connect AltTextLab to Claude

Connect Claude Web, Desktop and Cowork to AltTextLab MCP. Generate alt text for product images, audit website images missing alt text, and more using natural language, with authentication handled for you.

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AltTextLab is an AI service that generates accessible, SEO-aware alt text for images. It helps teams make image content easier to understand, index, and publish.

2 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 AltTextLab account to Claude via Composio Connect, enabling it to generate alt text for product images, audit website images missing alt text, create SEO alt text for thumbnails, 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 AltTextLab with

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Connecting AltTextLab 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 AltTextLab account

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

For example, ask Claude to:

  • "Generate alt text for product images"
  • "Audit website images missing alt text"
  • "Create SEO alt text for thumbnails"

It will prompt you to authenticate and authorize access.

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

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

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

Troubleshooting

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

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

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

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

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

  • 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 AltTextLab.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the AltTextLab authorization link not work?

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

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

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

The AltTextLab connection can expire or lose permission.

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

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

Claude can manage the AltTextLab connection for you.

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

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

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

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If AltTextLab 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 AltTextLab.
TOOLS

Supported Tools

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

Generate Alt Text

Generate accessible alt text for a publicly reachable image URL, optionally guided by language, writing style, SEO keywords, product details, and page context.

Get Account Credits

Return the connected AltTextLab account's plan, activation state, and current generation credit balance.

FRAMEWORKS

How to build AltTextLab MCP Agent with another framework

ChatGPT logo

ChatGPT

Use AltTextLab MCP with ChatGPT

Hermes logo

Hermes

Use AltTextLab MCP with Hermes

Atomic Agent logo

Atomic Agent

Use AltTextLab MCP with Atomic Agent

FAQ

Frequently asked questions

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

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

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