Hunter MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Hunter MCP or direct API to find leads, verify emails, enrich contacts, and automate outreach—all through natural language.

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Api Key

Hunter is an email marketing platform for lead generation and contact data enrichment. It helps you quickly find and verify professional email addresses to boost outreach.

26 Tools

Try Hunter now

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

TOOL ROUTER PLAYGROUND
Hunter
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TOOLS

Supported Tools

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

Account Information

Tool to retrieve information about your Hunter account.

Combined Enrichment

Tool to find both person and company information from an email address or LinkedIn handle in a single request.

Company Enrichment

Tool to get enrichment information for a company by its domain.

Create custom lead attribute

Tool to create a new custom lead attribute in your account.

Create Lead

Tool to create a new lead.

Create Leads List

Tool to create a new leads list.

Delete Custom Attribute

Tool to delete an existing custom attribute.

Delete Lead

Tool to delete a lead.

Delete Leads List

Tool to delete a leads list by its ID.

Discover Companies

Tool to search and retrieve companies matching specified criteria using filters or natural language queries.

Domain Search

Tool to search all email addresses for a given domain or company.

Email Count

Tool to get the total number of email addresses Hunter has for a domain or company with breakdowns by type, department, and seniority.

Email Finder

Tool to find the most likely email address for a person at a domain or company.

Email Verifier

Tool to verify the deliverability of an email address.

Get Custom Attribute

Tool to retrieve details of a specific custom attribute.

Get Lead

Tool to retrieve details of a specific lead by ID.

Get Leads List

Tool to retrieve details of a specific leads list by ID.

List Campaigns

Tool to get all email campaigns in your Hunter account.

List Custom Attributes

Tool to list all custom lead attributes in your account.

List Leads

Tool to list all leads saved in your account with optional filters.

List Leads Lists

Tool to list all leads lists in your account.

People Enrichment

Tool to find all information associated with an email address or LinkedIn profile including name, location, job title and social handles.

Update Custom Attribute

Tool to update an existing custom attribute's label.

Update Lead

Tool to update details of an existing lead by ID.

Update Leads List

Tool to update the name of a specific leads list.

Upsert Lead

Tool to create or update a lead by email in one call.

SETUP GUIDE

Connect Hunter 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: ["hunter"],
  mcp: true,
});
Create a session scoped to Hunter 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: "Find verified emails for all employees at hubspot.com",
  stopWhen: stepCountIs(10),
});

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

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

Run Hunter tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Find verified emails for all employees at hubspot.com" }],
});

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

Why Use Composio?

AI Native Hunter Integration

  • Supports both Hunter MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable tool execution
  • Rich coverage for reading, writing, and querying your Hunter data

Managed Auth

  • Built-in OAuth handling with automatic token refresh and rotation
  • Central place to manage, scope, and revoke Hunter 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 Hunter
  • Scoped, least privilege access to Hunter 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, Hunter 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 Hunter 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 Hunter account settings, then paste it once on Composio's connection page. Composio stores it encrypted and uses it only for the Hunter actions your agent runs. Nobody else in your workspace can read it, and you can revoke it inside Hunter at any time.

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

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

With Composio, you connect Hunter 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 Hunter.It takes 30 seconds.

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

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