What is apollo-io-mcp CLAUDE.md?

Repository instructions for an MCP server that connects Claude Desktop to Apollo.io, a business database for finding and researching companies and people.

Use them when developing, testing, inspecting, or releasing the Apollo.io MCP server.

They explain the server's structure, commands, tests, and release process so contributors can change it consistently.

How thevgergroup/apollo-io-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to thevgergroup/apollo-io-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/thevgergroup/apollo-io-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/thevgergroup/apollo-io-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/thevgergroup/apollo-io-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/thevgergroup/apollo-io-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/thevgergroup/apollo-io-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/thevgergroup/apollo-io-mcp/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/thevgergroup/apollo-io-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/thevgergroup/apollo-io-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,212 This file is loaded in full into every session.

When invoked 1,212 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.01212	$0.01212
Opus 5.5	$0.00485	$0.00485
Sonnet 5.5	$0.00242	$0.00242
Haiku 4.5	$0.00121	$0.00121

Measured 2mo ago against content hash d8cfc19967cf, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

apollo-io-mcp CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 150 lines

How it starts

The opening of the file, as written. The whole thing — 150 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

This is a Model Context Protocol (MCP) server for Apollo.io API integration. It provides Claude Desktop with access to Apollo's B2B database for people and company search, enrichment, and insights.

Key Technology Stack:

TypeScript with ES2022 modules
MCP SDK (@modelcontextprotocol/sdk)
Zod for schema validation
Undici for HTTP requests
Vitest for testing

Common Commands

Development

npm run dev              # Watch mode with tsx
npm run build            # Compile TypeScript (also runs post-build.js)
npm start                # Run compiled server

Testing

npm test                 # Run all tests with vitest
npm run test:watch       # Run tests in watch mode
npm run test:coverage    # Run tests with coverage report

MCP Inspector (Testing Tools)

npm run inspector        # Launch MCP Inspector web UI
npm run inspector:cli    # Use MCP Inspector in CLI mode

Release Management

npm run release:patch    # Bump patch version
npm run release:minor    # Bump minor version
npm run release:major    # Bump major version

Architecture

Core Structure

Two main files:

src/apollo.ts - ApolloClient class that wraps Apollo.io API
src/server.ts - MCP server setup with tool registrations

ApolloClient Design:

Constructor takes apiKey and optional baseUrl
Private post() and get() methods handle all HTTP communication
Error handling for 401 (unauthorized), 429 (rate limit), and other HTTP errors
All API methods return typed promises using generics

MCP Server Design:

Uses McpServer from SDK with stdio transport
Nine registered tools covering Apollo.io API endpoints:
- apollo_search_people - People search with advanced filters
- apollo_search_companies - Company/org search with advanced filters
- apollo_enrich_person - Single person enrichment
- apollo_enrich_company - Single company enrichment
- apollo_bulk_enrich_people - Bulk people enrichment
- apollo_bulk_enrich_organizations - Bulk org enrichment
- apollo_get_organization_job_postings - Job postings by org ID
- apollo_get_complete_organization_info - Full org info by ID
- apollo_search_news_articles - News article search

Read the full file on GitHub · 150 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 150 lines · 1,212 tokens per session scan A d8cfc19967cf

Subscribe to this mod's changes

apollo-io-mcp CLAUDE.md is an instructions file published in the GitHub repository thevgergroup/apollo-io-mcp (19 stars, last pushed 2d ago), licensed MIT. It adds 1,212 tokens to every session, about $0.0048 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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apollo-io-mcp: Instructions file for Claude Code