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TrueList MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with TrueList MCP or direct API to validate email addresses, run batch validation jobs, monitor job status, and retrieve validation history through natural language.

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TrueList is an email validation service for checking addresses, batch jobs, and validation history. Use it to keep lists clean, reduce bounces, and protect sender reputation.

8 Tools

Try TrueList 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 TrueList action and event your agent gets out of the box.

Create Batch

Create an asynchronous TrueList batch email-validation job from tabular rows.

Delete Batch

Permanently delete one completed TrueList batch and its validation results.

Estimate Batch

Estimate email count, duplicates, and processing time for tabular batch data without creating a batch or consuming batch-validation credits.

Get Account

Return the connected TrueList user identity, account name, and payment plan without exposing API tokens or other account users.

Get Batch

Get one TrueList batch-validation job by UUID, including progress counts and completed result download URLs.

List Batches

List all batch-validation jobs in the connected TrueList account, including their current processing state, progress counts, and available result download URLs.

List Validation History

Return one page of previously validated email results, optionally filtered by batch, address, state, or sub-state.

Validate Email

Validate one email address synchronously, consume validation capacity, and add the result to TrueList validation history.

SETUP GUIDE

Connect TrueList 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: ["true_list"],
  mcp: true,
});
Create a session scoped to TrueList 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: "Validate jane.doe@example.com with TrueList and tell me whether it is deliverable",
  stopWhen: stepCountIs(10),
});

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

Connect TrueList 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: ["true_list"] });
const tools = await session.tools();
Initialize Composio with the OpenAI Responses provider and create a session scoped to TrueList
3

Run TrueList tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Validate jane.doe@example.com with TrueList and tell me whether it is deliverable" }],
});

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 TrueList tool calls through the session, and print the final answer

Why Use Composio?

AI Native TrueList Integration

  • Supports both TrueList MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable email validation workflows
  • Rich coverage for validating addresses, managing batch jobs, and reading validation history

Managed Auth

  • Bring your own TrueList API key and let Composio store it securely
  • Central place to manage, scope, and revoke TrueList access
  • Per user and per environment credentials instead of hard-coded keys

Agent Optimized Design

  • Tools are tuned using real error and success rates to improve reliability over time
  • Clear schemas help agents validate single emails, launch batches, and check job results without guesswork
  • Comprehensive execution logs so you always know what ran, when, and on whose behalf

Enterprise Grade Security

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

Frequently asked questions

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

When you connect a TrueList account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in TrueList 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 TrueList. If TrueList 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 TrueList 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 TrueList 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 TrueList rejects the old key. Create a new key in TrueList and reconnect the account from the Composio dashboard or by asking your agent to reconnect TrueList. Nothing else changes.

Composio's free Hobby plan includes 100,000 tool calls per month with no credit card, which covers most personal TrueList use. Paid plans add higher limits and team features. Your TrueList 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 TrueList accounts).

With Composio, you connect TrueList 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.

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