AltTextLab MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with AltTextLab MCP or direct API to generate alt text, audit image accessibility, improve SEO descriptions, and prepare accessible image metadata through natural language.

AltTextLab logoAltTextLab
Api Key

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

Try AltTextLab now

Type what you want done — sign in and watch it run live in the Tool Router playground.

TOOL ROUTER PLAYGROUND
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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.

SETUP GUIDE

Connect AltTextLab MCP Tool with your Agent

1

Install Composio

typescript
npm install @composio/core ai @ai-sdk/mcp @ai-sdk/openai
Install the Composio SDK and your agent framework
2

Create a session with MCP enabled

typescript
import { Composio } from "@composio/core";

const composio = new Composio();
const { mcp } = await composio.create("your-user-id", {
  toolkits: ["alt_text_lab"],
  mcp: true,
});
Create a session scoped to AltTextLab and read its MCP URL and headers
3

Connect your agent to the MCP server

typescript
import { createMCPClient } from "@ai-sdk/mcp";
import { openai } from "@ai-sdk/openai";
import { generateText, stepCountIs } from "ai";

const client = await createMCPClient({
  transport: { type: "http", url: mcp.url, headers: mcp.headers },
});

const { text } = await generateText({
  model: openai("gpt-5.6-sol"),
  tools: await client.tools(),
  prompt: "Generate accessible, SEO-aware alt text for this product image: https://example.com/images/red-running-shoe.jpg",
  stopWhen: stepCountIs(10),
});

console.log(text);
await client.close();
Pass the session's MCP URL and headers to your agent and run a AltTextLab request
SETUP GUIDE

Connect AltTextLab API Tool with your Agent

1

Install Composio

typescript
npm install @composio/core @composio/openai openai
Install the Composio SDK, the OpenAI provider, and the OpenAI SDK
2

Create a Composio session

typescript
import OpenAI from "openai";
import { Composio } from "@composio/core";
import { OpenAIResponsesProvider } from "@composio/openai";

const composio = new Composio({ provider: new OpenAIResponsesProvider() });
const client = new OpenAI();

const session = await composio.create("your-user-id", { toolkits: ["alt_text_lab"] });
const tools = await session.tools();
Initialize Composio with the OpenAI Responses provider and create a session scoped to AltTextLab
3

Run AltTextLab tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Generate accessible, SEO-aware alt text for this product image: https://example.com/images/red-running-shoe.jpg" }],
});

while (response.output.some((o) => o.type === "function_call")) {
  const outputs = await composio.provider.handleToolCalls(session, response.output);
  response = await client.responses.create({
    model: "gpt-5.6-sol",
    tools,
    previous_response_id: response.id,
    input: outputs,
  });
}

console.log(response.output_text);
Send a request, execute the AltTextLab tool calls through the session, and print the final answer

Why Use Composio?

AI Native AltTextLab Integration

  • Supports both AltTextLab MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable alt text generation
  • Rich coverage for generating, reviewing, and improving accessible image descriptions

Managed Auth

  • Secure API key handling without hard-coding AltTextLab credentials in your agent
  • Central place to manage, scope, and revoke AltTextLab access
  • Per user and per environment credentials for safer image workflow automation

Agent Optimized Design

  • Tools are tuned using real error and success rates to improve reliability over time
  • Comprehensive execution logs so you always know which images were processed, when, and on whose behalf

Enterprise Grade Security

  • Fine-grained RBAC so you control which agents and users can access AltTextLab
  • Scoped, least privilege access to AltTextLab resources
  • Full audit trail of agent actions to support accessibility review and compliance

Rolling this out across your team?

Give your team centralized access control across every framework with Composio’s MCP Gateway.

EXPLORE MCP GATEWAY
FAQ

Frequently asked questions

Yes, AltTextLab requires you to configure your own API key. Once set up, Composio handles secure credential storage and API request handling for you.

Yes! Composio's Tool Router enables agents to use multiple toolkits. Learn more.

Yes. Composio is SOC 2 Type II compliant and is built to keep your AltTextLab connection and credentials secure. OAuth tokens and API keys are encrypted, and sensitive customer data is protected at rest and in transit.

Composio also undergoes independent security testing and continuously monitors its systems for security threats. You can review the latest reports and policies in the Composio Trust Center.

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

Create the key in your AltTextLab account settings, then paste it once on Composio's connection page. Composio stores it encrypted and uses it only for the AltTextLab actions your agent runs. Nobody else in your workspace can read it, and you can revoke it inside AltTextLab at any time.

When you connect a AltTextLab account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in AltTextLab as done by you. Keep an approval step in your prompt for actions with side effects, such as sending or deleting, and have the agent draft first.

Whatever the credentials you connect allow inside AltTextLab. If AltTextLab lets you scope a key to specific permissions, create a scoped one so the agent can only do what you intend. You can revoke the key inside AltTextLab at any time.

Yes. Composio supports multiple connected accounts for the same app, and that works in Claude, ChatGPT, or any other assistant you connect through Composio. Give each AltTextLab connection a name such as work or personal, and the assistant uses the one you mention in the request. Each account keeps its own credentials and nothing is merged.

The connection stops working the moment AltTextLab rejects the old key. Create a new key in AltTextLab and reconnect the account from the Composio dashboard or by asking your agent to reconnect AltTextLab. Nothing else changes.

Composio's free Hobby plan includes 100,000 tool calls per month with no credit card, which covers most personal AltTextLab use. Paid plans add higher limits and team features. Your AltTextLab plan and its API limits still apply as usual.

Built-in connectors usually give one AI access to a limited set of apps. Many people use Composio because it lets their AI connect to more apps than it normally supports, or connect to multiple accounts for the same app (e.g. connect Claude to multiple AltTextLab accounts).

With Composio, you connect AltTextLab once and then use it across different AI assistants without setting it up separately in each one. Connect your apps to Composio once, then connect Composio to whichever AI you use, whether that's Claude, ChatGPT, Hermes, or your own custom assistant.

Start with AltTextLab.It takes 30 seconds.

Managed auth, hosted MCP servers, and every AltTextLab tool your agent needs.Free to start.

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