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Apollo.io MCP Server

Apollo.io MCP Server

TypeScript Apollo.io API MCP SDK License: MIT

A powerful Model Context Protocol (MCP) server implementation for seamless Apollo.io API integration, enabling AI assistants to interact with Apollo.io data.

Overview

This MCP server provides a comprehensive set of tools for interacting with the Apollo.io API, allowing AI assistants to:

  • Enrich data for people and organizations

  • Search for people and organizations

  • Find job postings for specific organizations

  • Perform Apollo.io operations without leaving your AI assistant interface

Related MCP server: apollo-io-mcp

Why Use This MCP Server?

  • Seamless AI Integration: Connect your AI assistants directly to Apollo.io data

  • Simplified API Operations: Perform common Apollo.io tasks through natural language commands

  • Real-time Data Access: Get up-to-date information from Apollo.io

  • Secure Authentication: Uses Apollo.io's secure API token authentication

  • Extensible Design: Easily add more Apollo.io API capabilities as needed

Installation

# Clone the repository
git clone https://github.com/lkm1developer/apollo-io-mcp-server.git
cd apollo-io-mcp-server

# Install dependencies
npm install

# Build the project
npm run build

Configuration

The server requires an Apollo.io API access token. You can obtain one by:

  1. Going to your Apollo.io Account

  2. Navigating to Settings > API

  3. Generating an API key

You can provide the token in two ways:

  1. As an environment variable:

    APOLLO_IO_API_KEY=your-api-key
  2. As a command-line argument:

    npm start -- --api-key=your-api-key

For development, create a .env file in the project root to store your environment variables:

APOLLO_IO_API_KEY=your-api-key

Usage

Starting the Server

# Start the server
npm start

# Or with a specific API key
npm start -- --api-key=your-api-key

# Run the SSE server with authentication
npx mcp-proxy-auth node dist/index.js

Implementing Authentication in SSE Server

The SSE server uses the mcp-proxy-auth package for authentication. To implement authentication:

  1. Install the package:

    npm install mcp-proxy-auth
  2. Set the AUTH_SERVER_URL environment variable to point to your API key verification endpoint:

    export AUTH_SERVER_URL=https://your-auth-server.com/verify
  3. Run the SSE server with authentication:

    npx mcp-proxy-auth node dist/index.js
  4. The SSE URL will be available at:

    localhost:8080/sse?apiKey=apikey

    Replace apikey with your actual API key for authentication.

The mcp-proxy-auth package acts as a proxy that:

  • Intercepts requests to your SSE server

  • Verifies API keys against your authentication server

  • Only allows authenticated requests to reach your SSE endpoint

Integrating with AI Assistants

This MCP server is designed to work with AI assistants that support the Model Context Protocol. Once running, the server exposes a set of tools that can be used by compatible AI assistants to interact with Apollo.io data.

Available Tools

The server exposes the following powerful Apollo.io integration tools:

  1. people_enrichment

    • Use the People Enrichment endpoint to enrich data for 1 person

    • Parameters:

      • first_name (string, optional): Person's first name

      • last_name (string, optional): Person's last name

      • email (string, optional): Person's email address

      • domain (string, optional): Company domain

      • organization_name (string, optional): Organization name

    • Example:

      {
        "first_name": "John",
        "last_name": "Doe",
        "email": "john.doe@example.com"
      }
  2. organization_enrichment

    • Use the Organization Enrichment endpoint to enrich data for 1 company

    • Parameters:

      • domain (string, optional): Company domain

      • name (string, optional): Company name

    • Example:

      {
        "domain": "apollo.io"
      }
  3. people_search

    • Use the People Search endpoint to find people

    • Parameters:

      • q_organization_domains_list (array, optional): List of organization domains to search within

      • person_titles (array, optional): List of job titles to search for

      • person_seniorities (array, optional): List of seniority levels to search for

    • Example:

      {
        "person_titles": ["Marketing Manager"],
        "person_seniorities": ["vp"],
        "q_organization_domains_list": ["apollo.io"]
      }
  4. organization_search

    • Use the Organization Search endpoint to find organizations

    • Parameters:

      • q_organization_domains_list (array, optional): List of organization domains to search for

      • organization_locations (array, optional): List of organization locations to search for

    • Example:

      {
        "organization_locations": ["Japan", "Ireland"]
      }
  5. organization_job_postings

    • Use the Organization Job Postings endpoint to find job postings for a specific organization

    • Parameters:

      • organization_id (string, required): Apollo.io organization ID

    • Example:

      {
        "organization_id": "5e60b6381c85b4008c83"
      }

Extending the Server

The server is designed to be easily extensible. To add new Apollo.io API capabilities:

  1. Add new methods to the ApolloClient class in src/apollo-client.ts

  2. Register new tools in the setupToolHandlers method in src/index.ts

  3. Rebuild the project with npm run build

License

This project is licensed under the MIT License - see the LICENSE file for details.

Keywords

Apollo.io, Model Context Protocol, MCP, AI Assistant, TypeScript, API Integration, Apollo.io API, People Enrichment, Organization Enrichment, People Search, Organization Search, Job Postings, AI Tools

Available Tools

7 tools
employees_of_companyC

Find employees of a company using company name or website/LinkedIn URL

ParametersJSON Schema
NameRequiredDescriptionDefault
companyYesCompany name
website_urlNoCompany website URL
linkedin_urlNoCompany LinkedIn URL

TDQS

C2.9/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries full burden. It states the action ('Find employees') but lacks behavioral details such as what data is returned (e.g., employee names, roles, contact info), whether it's a read-only operation, potential rate limits, authentication needs, or error handling. This leaves significant gaps for an agent to understand the tool's behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence that front-loads the core purpose ('Find employees of a company') and specifies input methods. There is no wasted text, making it highly concise and well-structured for quick understanding.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the complexity of a search tool with 3 parameters, no annotations, and no output schema, the description is incomplete. It doesn't explain what the tool returns (e.g., list of employees, details), behavioral traits, or usage context relative to siblings. This leaves the agent under-informed for effective tool selection and invocation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents all parameters (company, website_url, linkedin_url) with descriptions. The description adds minimal value by mentioning input options but doesn't provide additional semantics like format examples, constraints, or how parameters interact (e.g., if multiple are provided). Baseline 3 is appropriate as the schema does the heavy lifting.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'Find employees of a company' with specific input options (company name or website/LinkedIn URL). It uses a clear verb ('Find') and resource ('employees of a company'), but doesn't explicitly differentiate from sibling tools like 'people_search' or 'organization_search', which might have overlapping functionality.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives like 'people_search' or 'organization_search'. It mentions input options but doesn't specify scenarios, prerequisites, or exclusions for usage, leaving the agent to guess about context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_person_emailC

Get email address for a person using their Apollo ID

ParametersJSON Schema
NameRequiredDescriptionDefault
apollo_idYesApollo.io person ID

TDQS

C2.9/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states the tool 'Get email address', which implies a read-only operation, but doesn't disclose any behavioral traits like authentication requirements, rate limits, error handling, or what happens if no email is found. For a tool with zero annotation coverage, this leaves significant gaps in understanding its behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence: 'Get email address for a person using their Apollo ID'. It is front-loaded with the core action and resource, with no wasted words. Every part of the sentence contributes directly to understanding the tool's purpose, making it highly concise and well-structured.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (a simple lookup with one parameter) and lack of annotations or output schema, the description is incomplete. It doesn't explain what the return value looks like (e.g., email string, error messages), behavioral aspects like permissions or limitations, or how it differs from sibling tools. For a tool with no structured data beyond the input schema, more context is needed to be fully helpful.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description adds minimal meaning beyond the input schema. It mentions 'using their Apollo ID', which aligns with the 'apollo_id' parameter in the schema. Since schema description coverage is 100% (the parameter is fully described as 'Apollo.io person ID'), the baseline is 3. The description doesn't provide additional syntax, format details, or constraints, so it meets but doesn't exceed the baseline.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'Get email address for a person using their Apollo ID'. It specifies the verb ('Get'), resource ('email address'), and key identifier ('Apollo ID'), making the action unambiguous. However, it does not explicitly differentiate this tool from sibling tools like 'people_enrichment' or 'people_search', which might also retrieve person-related data, so it doesn't fully distinguish from alternatives.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention sibling tools like 'people_enrichment' or 'people_search', nor does it specify prerequisites, such as needing an Apollo ID. The context is implied (use when you have an Apollo ID and want an email), but there's no explicit when/when-not or alternative recommendations.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

organization_enrichmentC

Use the Organization Enrichment endpoint to enrich data for 1 company

ParametersJSON Schema
NameRequiredDescriptionDefault
domainNoCompany domain
nameNoCompany name

TDQS

C2.9/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the tool enriches data but doesn't explain what 'enrich' entails (e.g., adding details like industry, size, location), whether it's a read-only or mutative operation, or any constraints like rate limits or authentication needs. This lack of detail makes it inadequate for a tool with potential complexity.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence that directly states the tool's function without any fluff. It's front-loaded with the core action ('enrich data') and resource ('1 company'), making it easy to parse. Every word earns its place, achieving optimal conciseness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the lack of annotations and output schema, the description is incomplete for a data enrichment tool. It doesn't explain what enriched data is returned (e.g., company details, metrics), how results are structured, or any behavioral traits like error handling. For a tool that likely provides rich output, this leaves significant gaps in understanding its full context.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has 100% description coverage, with clear documentation for 'domain' and 'name'. The description adds no additional parameter semantics beyond implying it processes '1 company', which aligns with the schema but doesn't provide extra context like how parameters interact or which is prioritized. This meets the baseline for high schema coverage.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'enrich data for 1 company' using the Organization Enrichment endpoint. It specifies the verb ('enrich') and resource ('data for 1 company'), making the intent unambiguous. However, it doesn't differentiate from sibling tools like 'organization_search' or 'people_enrichment', which prevents a perfect score.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention when to prefer this over 'organization_search' for enrichment versus search, or over 'people_enrichment' for company versus individual data. There's no context about prerequisites, exclusions, or typical use cases, leaving the agent without operational direction.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

organization_job_postingsC

Use the Organization Job Postings endpoint to find job postings for a specific organization

ParametersJSON Schema
NameRequiredDescriptionDefault
organization_idYesApollo.io organization ID

TDQS

C2.9/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden for behavioral disclosure. It states the tool 'finds' job postings, implying a read operation, but doesn't mention permissions, rate limits, pagination, or what the response includes. This leaves significant gaps for a tool with no output schema.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence with zero waste. It's appropriately sized and front-loaded, directly stating the tool's purpose without unnecessary elaboration.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given no annotations and no output schema, the description is incomplete. It doesn't explain what the tool returns (e.g., list of postings, metadata), error conditions, or behavioral traits. For a tool with 1 parameter and 100% schema coverage, it minimally covers purpose but lacks critical context for effective use.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents the 'organization_id' parameter. The description adds no additional meaning about the parameter beyond implying it's for a 'specific organization', which is redundant with the schema. Baseline 3 is appropriate when schema does the heavy lifting.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'find job postings for a specific organization' with a specific verb ('find') and resource ('job postings'). It distinguishes from siblings like 'organization_search' or 'employees_of_company' by focusing on job postings, but doesn't explicitly contrast them.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives like 'organization_search' or 'people_search'. It mentions 'specific organization' but doesn't clarify prerequisites, exclusions, or comparative use cases with sibling tools.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

people_enrichmentC

Use the People Enrichment endpoint to enrich data for 1 person

ParametersJSON Schema
NameRequiredDescriptionDefault
first_nameNoPerson's first name
last_nameNoPerson's last name
emailNoPerson's email address
domainNoCompany domain
organization_nameNoOrganization name
linkedin_urlNoPerson's LinkedIn profile URL

TDQS

C2.9/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the tool enriches data for one person but doesn't describe what 'enrich' entails (e.g., adding contact info, job history, social profiles), whether it requires authentication, rate limits, or what the output looks like. This is a significant gap for a tool with no annotations or output schema.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence that directly states the tool's core function. It's appropriately sized for a tool with a clear purpose and well-documented schema, with zero wasted words or unnecessary elaboration.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (6 parameters, no annotations, no output schema), the description is incomplete. It doesn't explain what 'enrichment' means, what data is returned, or how parameters are used. For a data enrichment tool with multiple input options and no structured output documentation, this leaves significant gaps for the agent.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents all 6 parameters with clear descriptions. The description adds no additional parameter semantics beyond implying these fields are used for enrichment. This meets the baseline of 3 when schema does the heavy lifting, but doesn't compensate with extra context like which parameters are most important or how they interact.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'enrich data for 1 person' with the specific verb 'enrich' and resource 'person'. It distinguishes from siblings like 'employees_of_company' (multiple people) and 'get_person_email' (specific data point). However, it doesn't specify what 'enrich' means in terms of data types or sources, keeping it at 4 rather than 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention when to choose this over 'people_search' (which might find multiple people) or 'organization_enrichment' (which enriches company data). There's no context about prerequisites or exclusions, leaving the agent to guess based on tool names alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

TDQS

B3/5.0
Disambiguation4/5

Most tools have distinct purposes, but there is some potential overlap between organization_search and organization_enrichment, as both involve company data retrieval. However, their descriptions clarify that search is for finding organizations while enrichment is for augmenting data on a known company, which helps mitigate confusion. The other tools target clearly different resources like employees, emails, job postings, and people.

Naming Consistency4/5

The naming follows a consistent snake_case pattern throughout, which is good. However, there is a minor inconsistency: most tools use a verb_noun format (e.g., organization_search, people_enrichment), but employees_of_company uses a noun_of_noun structure, deviating slightly from the pattern. This does not severely impact readability but is a noticeable deviation.

Tool Count5/5

With 7 tools, the count is well-scoped for a sales intelligence or recruitment domain, covering key operations like searching and enriching data for both organizations and people. Each tool appears to earn its place without feeling excessive or sparse, aligning well with the server's apparent purpose of data enrichment and lookup.

Completeness4/5

The tool set provides solid coverage for core workflows in the domain, including search and enrichment for both organizations and people, plus specific functions like finding employees and emails. A minor gap is the lack of update or delete operations, but this is reasonable for a read-heavy enrichment server. The surface supports common agent tasks without obvious dead ends.

Maintenance

ActivityInactive
ResponsivenessNo issues

Resources

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