# How to integrate Hunter MCP with CrewAI ```json { "title": "How to integrate Hunter MCP with CrewAI", "toolkit": "Hunter", "toolkit_slug": "hunter", "framework": "CrewAI", "framework_slug": "crew-ai", "url": "https://composio.dev/toolkits/hunter/framework/crew-ai", "markdown_url": "https://composio.dev/toolkits/hunter/framework/crew-ai.md", "updated_at": "2026-05-12T10:15:24.853Z" } ``` ## Introduction This guide walks you through connecting Hunter to CrewAI using the Composio tool router. By the end, you'll have a working Hunter agent that can find all public emails at acme.com, enrich company details for tesla.com, create new lead with given info through natural language commands. This guide will help you understand how to give your CrewAI agent real control over a Hunter account through Composio's Hunter MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved. ## Also integrate Hunter with - [OpenAI Agents SDK](https://composio.dev/toolkits/hunter/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/hunter/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/hunter/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/hunter/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/hunter/framework/codex) - [OpenClaw](https://composio.dev/toolkits/hunter/framework/openclaw) - [Hermes](https://composio.dev/toolkits/hunter/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/hunter/framework/cli) - [Google ADK](https://composio.dev/toolkits/hunter/framework/google-adk) - [LangChain](https://composio.dev/toolkits/hunter/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/hunter/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/hunter/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/hunter/framework/llama-index) ## TL;DR Here's what you'll learn: - Get a Composio API key and configure your Hunter connection - Set up CrewAI with an MCP enabled agent - Create a Tool Router session or standalone MCP server for Hunter - Build a conversational loop where your agent can execute Hunter operations ## What is CrewAI? CrewAI is a powerful framework for building multi-agent AI systems. It provides primitives for defining agents with specific roles, creating tasks, and orchestrating workflows through crews. Key features include: - Agent Roles: Define specialized agents with specific goals and backstories - Task Management: Create tasks with clear descriptions and expected outputs - Crew Orchestration: Combine agents and tasks into collaborative workflows - MCP Integration: Connect to external tools through Model Context Protocol ## What is the Hunter MCP server, and what's possible with it? The Hunter MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Hunter account. It provides structured and secure access to your lead generation and enrichment tools, so your agent can perform actions like finding emails, enriching company data, managing leads, and organizing leads lists on your behalf. - Email discovery and search: Instantly ask your agent to find all public email addresses for a given company or domain, complete with metadata to fuel your outreach and marketing campaigns. - Smart lead creation and management: Let your agent add new leads, update lead details, or delete outdated entries to keep your Hunter account organized and up-to-date. - Company and contact enrichment: Have the agent fetch detailed company profiles or use the Email Finder to infer the best contact email for a specific person at a target company. - Leads list organization: Direct your agent to create, update, or remove custom leads lists—making it easy to segment prospects for personalized marketing or sales workflows. - Custom attribute management: Empower your agent to create or delete custom lead attributes, tailoring your CRM data fields to match your unique business needs. ## Supported Tools | Tool slug | Name | Description | |---|---|---| | `HUNTER_ACCOUNT_INFORMATION` | Account Information | Tool to retrieve information about your Hunter account. Use when you need to check your plan details and usage limits after confirming credentials. Returns `searches.available` and `verifications.available` fields among others; check these before bulk operations to avoid quota exhaustion. | | `HUNTER_COMBINED_ENRICHMENT` | Combined Enrichment | Tool to find both person and company information from an email address or LinkedIn handle in a single request. Use when you need complete professional profile enrichment including employment and company details. | | `HUNTER_COMPANY_ENRICHMENT` | Company Enrichment | Tool to get enrichment information for a company by its domain. Use when you need full company details (industry, description, location, metrics) from Hunter. | | `HUNTER_CREATE_CUSTOM_ATTRIBUTE` | Create custom lead attribute | Tool to create a new custom lead attribute in your account. Use after deciding on the attribute label. | | `HUNTER_CREATE_LEAD` | Create Lead | Tool to create a new lead. Use after gathering all prospect details to save them to your Hunter account. | | `HUNTER_CREATE_LEADS_LIST` | Create Leads List | Tool to create a new leads list. Use when you need to organize leads into a custom list before adding leads. | | `HUNTER_DELETE_CUSTOM_ATTRIBUTE` | Delete Custom Attribute | Tool to delete an existing custom attribute. Use after confirming the attribute ID to be removed. | | `HUNTER_DELETE_LEAD` | Delete Lead | Tool to delete a lead. Use after confirming the lead's ID to remove it from your Hunter.io account. | | `HUNTER_DELETE_LEADS_LIST` | Delete Leads List | Tool to delete a leads list by its ID. Use after confirming the leads list ID to remove it from your Hunter.io account. | | `HUNTER_DISCOVER_COMPANIES` | Discover Companies | Tool to search and retrieve companies matching specified criteria using filters or natural language queries. Use when you need to discover companies from Hunter's B2B dataset based on industry, location, size, or other characteristics. | | `HUNTER_DOMAIN_SEARCH` | Domain Search | Tool to search all email addresses for a given domain or company. Use when you need public emails and metadata for outreach or enrichment. Rate-limited; HTTP 429 returned on excess requests — honor the Retry-After header. | | `HUNTER_EMAIL_COUNT` | 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. Use when you need email volume statistics without consuming API credits (this call is free). | | `HUNTER_EMAIL_FINDER` | Email Finder | Tool to find the most likely email address for a person at a domain or company. Use when you have a person's name and a domain or company and need to infer their email. Results include a confidence score and status; treat emails with status 'accept_all' or 'risky' as lower reliability. Each call consumes API credits — avoid re-enriching the same contact. | | `HUNTER_EMAIL_VERIFIER` | Email Verifier | Tool to verify the deliverability of an email address. Use when you need to ensure an address is valid and reachable. Response may include statuses `accept_all` or `risky`, indicating uncertain deliverability; do not treat these as fully valid without explicit review. For bulk verification, honor `Retry-After` headers on HTTP 429 responses and use exponential backoff. | | `HUNTER_GET_CUSTOM_ATTRIBUTE` | Get Custom Attribute | Tool to retrieve details of a specific custom attribute. Use when you need the label and slug for an attribute ID. | | `HUNTER_GET_LEAD` | Get Lead | Tool to retrieve details of a specific lead by ID. Use after confirming the lead's ID to fetch its full record. | | `HUNTER_GET_LEADS_LIST` | Get Leads List | Tool to retrieve details of a specific leads list by ID. Use when you need to inspect the contents of an existing leads list. | | `HUNTER_LIST_CAMPAIGNS` | List Campaigns | Tool to get all email campaigns in your Hunter account. Campaigns are returned in reverse-chronological order by creation date. Use when you need to retrieve and filter campaigns by status (started/archived) with pagination support. | | `HUNTER_LIST_CUSTOM_ATTRIBUTES` | List Custom Attributes | Tool to list all custom lead attributes in your account. Use when you need to retrieve your account's custom lead attributes after authenticating. | | `HUNTER_LIST_LEADS` | List Leads | Tool to list all leads saved in your account with optional filters. Use when you need to retrieve leads with specific criteria after confirming your API key. | | `HUNTER_LIST_LEADS_LISTS` | List Leads Lists | Tool to list all leads lists in your account. Use when you need to retrieve and paginate through your leads lists. | | `HUNTER_PEOPLE_ENRICHMENT` | People Enrichment | Tool to find all information associated with an email address or LinkedIn profile including name, location, job title and social handles. Use when you need to enrich contact data with additional personal and professional details. | | `HUNTER_UPDATE_CUSTOM_ATTRIBUTE` | Update Custom Attribute | Tool to update an existing custom attribute's label. Use when renaming a custom attribute after creation. | | `HUNTER_UPDATE_LEAD` | Update Lead | Tool to update details of an existing lead by ID. Use when you need to modify saved lead attributes after creation. | | `HUNTER_UPDATE_LEADS_LIST` | Update Leads List | Tool to update the name of a specific leads list. Use when renaming an existing leads list. | | `HUNTER_UPSERT_LEAD` | Upsert Lead | Tool to create or update a lead by email in one call. Use when you want to ensure a lead exists with the provided information without checking its existence first. | ## Supported Triggers None listed. ## Creating MCP Server - Stand-alone vs Composio SDK The Hunter MCP server is an implementation of the Model Context Protocol that connects your AI agent to Hunter. It provides structured and secure access so your agent can perform Hunter operations on your behalf through a secure, permission-based interface. With Composio's managed implementation, you don't have to create your own developer app. For production, if you're building an end product, we recommend using your own credentials. The managed server helps you prototype fast and go from 0-1 faster. ## Step-by-step Guide ### 1. Prerequisites Before starting, make sure you have: - Python 3.9 or higher - A Composio account and API key - A Hunter connection authorized in Composio - An OpenAI API key for the CrewAI LLM - Basic familiarity with Python ### 1. Getting API Keys for OpenAI and Composio OpenAI API Key - Go to the [OpenAI dashboard](https://platform.openai.com/settings/organization/api-keys) and create an API key. You'll need credits to use the models, or you can connect to another model provider. - Keep the API key safe. Composio API Key - Log in to the [Composio dashboard](https://dashboard.composio.dev?utm_source=toolkits&utm_medium=framework_docs). - Navigate to your API settings and generate a new API key. - Store this key securely as you'll need it for authentication. ### 2. Install dependencies **What's happening:** - composio connects your agent to Hunter via MCP - crewai provides Agent, Task, Crew, and LLM primitives - crewai-tools[mcp] includes MCP helpers - python-dotenv loads environment variables from .env ```bash pip install composio crewai crewai-tools[mcp] python-dotenv ``` ### 3. Set up environment variables Create a .env file in your project root. What's happening: - COMPOSIO_API_KEY authenticates with Composio - USER_ID scopes the session to your account - OPENAI_API_KEY lets CrewAI use your chosen OpenAI model ```bash COMPOSIO_API_KEY=your_composio_api_key_here USER_ID=your_user_id_here OPENAI_API_KEY=your_openai_api_key_here ``` ### 4. Import dependencies **What's happening:** - CrewAI classes define agents and tasks, and run the workflow - MCPServerHTTP connects the agent to an MCP endpoint - Composio will give you a short lived Hunter MCP URL ```python import os from composio import Composio from crewai import Agent, Task, Crew from crewai_tools import MCPServerAdapter import dotenv dotenv.load_dotenv() COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY") COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID") if not COMPOSIO_API_KEY: raise ValueError("COMPOSIO_API_KEY is not set") if not COMPOSIO_USER_ID: raise ValueError("COMPOSIO_USER_ID is not set") ``` ### 5. Create a Composio Tool Router session for Hunter **What's happening:** - You create a Hunter only session through Composio - Composio returns an MCP HTTP URL that exposes Hunter tools ```python composio_client = Composio(api_key=COMPOSIO_API_KEY) session = composio_client.create(user_id=COMPOSIO_USER_ID, toolkits=["hunter"]) url = session.mcp.url ``` ### 6. Initialize the MCP Server **What's Happening:** - Server Configuration: The code sets up connection parameters including the MCP server URL, streamable HTTP transport, and Composio API key authentication. - MCP Adapter Bridge: MCPServerAdapter acts as a context manager that converts Composio MCP tools into a CrewAI-compatible format. - Agent Setup: Creates a CrewAI Agent with a defined role (Search Assistant), goal (help with internet searches), and access to the MCP tools. - Configuration Options: The agent includes settings like verbose=False for clean output and max_iter=10 to prevent infinite loops. - Dynamic Tool Usage: Once created, the agent automatically accesses all Composio Search tools and decides when to use them based on user queries. ```python server_params = { "url": url, "transport": "streamable-http", "headers": {"x-api-key": COMPOSIO_API_KEY}, } with MCPServerAdapter(server_params) as tools: agent = Agent( role="Search Assistant", goal="Help users search the internet effectively", backstory="You are a helpful assistant with access to search tools.", tools=tools, verbose=False, max_iter=10, ) ``` ### 7. Create a CLI Chatloop and define the Crew **What's Happening:** - Interactive CLI Setup: The code creates an infinite loop that continuously prompts for user input and maintains the entire conversation history in a string variable. - Input Validation: Empty inputs are ignored to prevent processing blank messages and keep the conversation clean. - Context Building: Each user message is appended to the conversation context, which preserves the full dialogue history for better agent responses. - Dynamic Task Creation: For every user input, a new Task is created that includes both the full conversation history and the current request as context. - Crew Execution: A Crew is instantiated with the agent and task, then kicked off to process the request and generate a response. - Response Management: The agent's response is converted to a string, added to the conversation context, and displayed to the user, maintaining conversational continuity. ```python print("Chat started! Type 'exit' or 'quit' to end.\n") conversation_context = "" while True: user_input = input("You: ").strip() if user_input.lower() in ["exit", "quit", "bye"]: print("\nGoodbye!") break if not user_input: continue conversation_context += f"\nUser: {user_input}\n" print("\nAgent is thinking...\n") task = Task( description=( f"Conversation history:\n{conversation_context}\n\n" f"Current request: {user_input}" ), expected_output="A helpful response addressing the user's request", agent=agent, ) crew = Crew(agents=[agent], tasks=[task], verbose=False) result = crew.kickoff() response = str(result) conversation_context += f"Agent: {response}\n" print(f"Agent: {response}\n") ``` ## Complete Code ```python from crewai import Agent, Task, Crew, LLM from crewai_tools import MCPServerAdapter from composio import Composio from dotenv import load_dotenv import os load_dotenv() GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY") COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY") COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID") if not GOOGLE_API_KEY: raise ValueError("GOOGLE_API_KEY is not set in the environment.") if not COMPOSIO_API_KEY: raise ValueError("COMPOSIO_API_KEY is not set in the environment.") if not COMPOSIO_USER_ID: raise ValueError("COMPOSIO_USER_ID is not set in the environment.") # Initialize Composio and create a session composio = Composio(api_key=COMPOSIO_API_KEY) session = composio.create( user_id=COMPOSIO_USER_ID, toolkits=["hunter"], ) url = session.mcp.url # Configure LLM llm = LLM( model="gpt-5", api_key=os.getenv("OPENAI_API_KEY"), ) server_params = { "url": url, "transport": "streamable-http", "headers": {"x-api-key": COMPOSIO_API_KEY}, } with MCPServerAdapter(server_params) as tools: agent = Agent( role="Search Assistant", goal="Help users with internet searches", backstory="You are an expert assistant with access to Composio Search tools.", tools=tools, llm=llm, verbose=False, max_iter=10, ) print("Chat started! Type 'exit' or 'quit' to end.\n") conversation_context = "" while True: user_input = input("You: ").strip() if user_input.lower() in ["exit", "quit", "bye"]: print("\nGoodbye!") break if not user_input: continue conversation_context += f"\nUser: {user_input}\n" print("\nAgent is thinking...\n") task = Task( description=( f"Conversation history:\n{conversation_context}\n\n" f"Current request: {user_input}" ), expected_output="A helpful response addressing the user's request", agent=agent, ) crew = Crew(agents=[agent], tasks=[task], verbose=False) result = crew.kickoff() response = str(result) conversation_context += f"Agent: {response}\n" print(f"Agent: {response}\n") ``` ## Conclusion You now have a CrewAI agent connected to Hunter through Composio's Tool Router. The agent can perform Hunter operations through natural language commands. Next steps: - Add role-specific instructions to customize agent behavior - Plug in more toolkits for multi-app workflows - Chain tasks for complex multi-step operations ## How to build Hunter MCP Agent with another framework - [OpenAI Agents SDK](https://composio.dev/toolkits/hunter/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/hunter/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/hunter/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/hunter/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/hunter/framework/codex) - [OpenClaw](https://composio.dev/toolkits/hunter/framework/openclaw) - [Hermes](https://composio.dev/toolkits/hunter/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/hunter/framework/cli) - [Google ADK](https://composio.dev/toolkits/hunter/framework/google-adk) - [LangChain](https://composio.dev/toolkits/hunter/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/hunter/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/hunter/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/hunter/framework/llama-index) ## Related Toolkits - [Reddit](https://composio.dev/toolkits/reddit) - Reddit is a social news platform with thriving user-driven communities (subreddits). It's the go-to place for discussion, content sharing, and viral marketing. - [Facebook](https://composio.dev/toolkits/facebook) - Facebook is a social media and advertising platform for businesses and creators. It helps you connect, share, and manage content across your public Facebook Pages. - [Linkedin](https://composio.dev/toolkits/linkedin) - LinkedIn is a professional networking platform for connecting, sharing content, and engaging with business opportunities. It's the go-to place for building your professional brand and unlocking new career connections. - [Active campaign](https://composio.dev/toolkits/active_campaign) - ActiveCampaign is a marketing automation and CRM platform for managing email campaigns, sales pipelines, and customer segmentation. It helps businesses engage customers and drive growth through smart automation and targeted outreach. - [ActiveTrail](https://composio.dev/toolkits/active_trail) - ActiveTrail is a user-friendly email marketing and automation platform. It helps you reach subscribers and automate campaigns with ease. - [Ahrefs](https://composio.dev/toolkits/ahrefs) - Ahrefs is an SEO and marketing platform for site audits, keyword research, and competitor insights. It helps you improve search rankings and drive organic traffic. - [Amcards](https://composio.dev/toolkits/amcards) - AMCards lets you create and mail personalized greeting cards online. Build stronger customer relationships with easy, automated card campaigns. - [Beamer](https://composio.dev/toolkits/beamer) - Beamer is a news and changelog platform for in-app announcements and feature updates. It helps companies boost user engagement by sharing news where users are most active. - [Benchmark email](https://composio.dev/toolkits/benchmark_email) - Benchmark Email is a platform for creating, sending, and tracking email campaigns. It's built to help you engage audiences and analyze results—all in one place. - [Bigmailer](https://composio.dev/toolkits/bigmailer) - BigMailer is an email marketing platform for managing multiple brands with white-labeling and automation. It helps teams streamline campaigns and simplify integration with Amazon SES. - [Brandfetch](https://composio.dev/toolkits/brandfetch) - Brandfetch is an API that delivers company logos, colors, and visual branding assets. It helps marketers and developers keep brand visuals consistent everywhere. - [Brevo](https://composio.dev/toolkits/brevo) - Brevo is an all-in-one email and SMS marketing platform for transactional messaging, automation, and CRM. It helps businesses engage customers and streamline communications through powerful campaign tools. - [Campayn](https://composio.dev/toolkits/campayn) - Campayn is an email marketing platform for creating, sending, and managing campaigns. It helps businesses engage contacts and grow audiences with easy-to-use tools. - [Cardly](https://composio.dev/toolkits/cardly) - Cardly is a platform for creating and sending personalized direct mail to customers. It helps businesses break through the digital clutter by getting real engagement via physical mailboxes. - [ClickSend](https://composio.dev/toolkits/clicksend) - ClickSend is a cloud-based SMS and email marketing platform for businesses. It streamlines communication by enabling quick message delivery and contact management. - [Crustdata](https://composio.dev/toolkits/crustdata) - CrustData is an AI-powered data intelligence platform for real-time company and people data. It helps B2B sales teams, AI SDRs, and investors react to live business signals. - [Curated](https://composio.dev/toolkits/curated) - Curated is a platform for collecting, curating, and publishing newsletters. It streamlines content aggregation and distribution for creators and teams. - [Customerio](https://composio.dev/toolkits/customerio) - Customer.io is a customer engagement platform for targeted messaging across email, SMS, and push. Easily automate, segment, and track communications with your audience. - [Cutt ly](https://composio.dev/toolkits/cutt_ly) - Cutt.ly is a URL shortening service for managing and analyzing links. Streamline your workflows with quick, trackable, and branded short URLs. - [Demio](https://composio.dev/toolkits/demio) - Demio is webinar software built for marketers, offering both live and automated sessions with interactive features. It helps teams engage audiences and optimize lead generation through detailed analytics. ## Frequently Asked Questions ### What are the differences in Tool Router MCP and Hunter MCP? With a standalone Hunter MCP server, the agents and LLMs can only access a fixed set of Hunter tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Hunter and many other apps based on the task at hand, all through a single MCP endpoint. ### Can I use Tool Router MCP with CrewAI? Yes, you can. CrewAI 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 Hunter tools. ### Can I manage the permissions and scopes for Hunter while using Tool Router? Yes, absolutely. You can configure which Hunter 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. ### How safe is my data with Composio Tool Router? 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 Hunter data and credentials are handled as safely as possible. --- [See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)