Neverbounce MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Neverbounce MCP or direct API to verify single emails, bulk validate lists, check email deliverability, and manage verification jobs through natural language.

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Api Key

NeverBounce is an email verification service that checks the validity of email addresses. It helps businesses improve deliverability and reduce bounce rates.

12 Tools

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TOOL ROUTER PLAYGROUND
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TOOLS

Supported Tools

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

Get Account Info

Tool to get account information including credits, job counts, and usage statistics.

Confirm Proof of Email

Tool to confirm proof of email ownership (POE) from the JavaScript widget.

Create NeverBounce Bulk Verification Job

Tool to create a new bulk verification job with parsing, sampling, and callback options.

Delete NeverBounce Job

Tool to permanently delete a job and its results.

Download Job Results (GET)

Tool to download job results as a CSV file via GET.

Retrieve Job Results

Tool to retrieve paginated results for a completed job, including original data and verification outcomes.

Start NeverBounce Job

Tool to start a parsed job when auto_start is disabled.

Get bulk job status

Tool to get the status and progress of a bulk verification job.

Parse NeverBounce Job

Tool to parse a job created with auto_parse disabled.

Search bulk verification jobs

Tool to search and list bulk verification jobs in your account with pagination and filtering.

NeverBounce Single Check

Tool to verify a single email address and gather additional information.

JS Widget Send Event

Tool to send widget form events via the JS widget API.

SETUP GUIDE

Connect Neverbounce 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: ["neverbounce"],
  mcp: true,
});
Create a session scoped to Neverbounce 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: "Verify if test@example.com is a valid email address",
  stopWhen: stepCountIs(10),
});

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

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

Run Neverbounce tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Verify if test@example.com is a valid email address" }],
});

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

Why Use Composio?

AI Native Neverbounce Integration

  • Supports both Neverbounce MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable tool execution
  • Rich coverage for validating emails, cleaning lists, and checking status in Neverbounce

Managed Auth

  • Built-in API key handling with secure storage
  • Central place to manage, scope, and revoke Neverbounce 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
  • 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 Neverbounce
  • Scoped, least privilege access to Neverbounce resources
  • Full audit trail of agent actions to support 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, Neverbounce requires you to configure your own API key credentials. 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 Neverbounce 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 Neverbounce account settings, then paste it once on Composio's connection page. Composio stores it encrypted and uses it only for the Neverbounce actions your agent runs. Nobody else in your workspace can read it, and you can revoke it inside Neverbounce at any time.

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

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

With Composio, you connect Neverbounce 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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