How do I find my Harmonic API Key?

Log in to your Harmonic account, go to the **Console**, and navigate to the **API** section. You will be able to generate and copy your unique apikey from there.

What happens if a company is not found in the database?

If a company is not found, Harmonic will return a `201 Enrichment Triggered` status. This means a background update has been queued. You can check the status later using the `get_enrichment_status` tool.

Can I search for companies based on specific criteria?

Yes! Use the `search_startups` tool. You can provide a JSON string with filters like headcount, location, or industry to find companies that match your investment or sales criteria.

Is the integration secure?

Absolutely. The integration only accesses your data through your unique API key. Your credentials are encrypted and stored securely within the Vinkius Cloud infrastructure.

Harmonic MCP Server for Claude Desktop 11 tools — connect in under 2 minutes

Name: Harmonic
Availability: InStock
Author: Vinkius

modelcontextprotocol.io/quickstart/user

Built by Vinkius GDPR 11 Tools IDE

Claude Desktop is Anthropic's native application for interacting with Claude AI models on macOS and Windows. It was the first consumer application to ship with built-in MCP support, making it the reference implementation for the Model Context Protocol standard.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

RecommendedModern Approach — Zero Configuration

Vinkius Desktop App

The modern way to manage MCP Servers — no config files, no terminal commands. Install Harmonic and 2,500+ MCP Servers from a single visual interface.

Download Free Open SourceNo signup required

Classic Setup·json

{
  "mcpServers": {
    "harmonic": {
      // Your Vinkius token. get it at cloud.vinkius.com
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Fully ManagedVinkius Servers

60%Token savings

High SecurityEnterprise-grade

IAMAccess control

EU AI ActCompliant

DLPData protection

V8 IsolateSandboxed

Ed25519Audit chain

<40msKill switch

Stream every event to Splunk, Datadog, or your own webhook in real-time

* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About Harmonic MCP Server

Connect your Harmonic.ai account to any AI agent and take full control of your startup discovery and investment research through natural conversation.

Claude Desktop is the definitive way to connect Harmonic to your AI workflow. Add Vinkius Edge URL to your config, restart the app, and Claude immediately exposes all 11 tools in the chat interface. ask a question, Claude calls the right tool, and you see the answer. Zero code, zero context switching.

What you can do

Company Enrichment — Instantly retrieve firmographics, funding history, and social traction signals for any domain.
Person Insights — Enrich professional profiles using LinkedIn URLs to get education and career history.
Startup Discovery — Search through over 35 million companies using advanced filters like headcount growth and industry.
Investor Research — Find investment firms and angels, and inspect their full portfolio history.
Funding Monitoring — List and retrieve details for funding rounds, including amounts and lead investors.
Enrichment Status — Track background data refresh requests to ensure you have the most up-to-date information.

The Harmonic MCP Server exposes 11 tools through the Vinkius. Connect it to Claude Desktop in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect Harmonic to Claude Desktop via MCP

Follow these steps to integrate the Harmonic MCP Server with Claude Desktop.

Open Claude Desktop Settings

Go to Settings → Developer → Edit Config to open claude_desktop_config.json

Add the MCP Server

Paste the configuration above into the mcpServers section

Restart Claude Desktop

Close and reopen Claude Desktop to load the new server

Start using Harmonic

Look for the 🔌 icon in the chat. your 11 tools are now available

Why Use Claude Desktop with the Harmonic MCP Server

Claude Desktop by Anthropic provides unique advantages when paired with Harmonic through the Model Context Protocol.

Claude Desktop is the reference MCP client. it was designed alongside the protocol itself, ensuring the most complete and stable MCP implementation available

Zero-code configuration: add a server URL to a JSON file and Claude instantly discovers and exposes all available tools in the chat interface

Claude's extended thinking capability lets it reason through multi-step tool usage, chaining multiple API calls to answer complex questions

Enterprise-grade security with local config storage. your tokens never leave your machine, and connections go directly to Vinkius Edge network

Harmonic + Claude Desktop Use Cases

Practical scenarios where Claude Desktop combined with the Harmonic MCP Server delivers measurable value.

Interactive data exploration: ask Claude to query DNS records, look up WHOIS data, and cross-reference results in a single conversation

Ad-hoc security audits: type a domain name and let Claude enumerate subdomains, check DNS history, and flag configuration anomalies. all through natural language

Executive briefings: generate comprehensive domain intelligence reports by asking Claude to compile findings into a formatted summary

Learning and training: new team members can explore API capabilities conversationally without needing to read documentation

Harmonic MCP Tools for Claude Desktop (11)

These 11 tools become available when you connect Harmonic to Claude Desktop via MCP:

enrich_company

Enrich a company with firmographics, funding, and social signals

enrich_person

Enrich a person with professional history and social signals

get_api_profile

Get information about the current API user

get_company_stats

Get growth and headcount statistics for a company

get_enrichment_status

Check the status of a background enrichment request

get_investor_portfolio

Get the list of portfolio companies for an investor

list_company_news

List recent news and press releases for a company

list_funding_rounds

List funding rounds for a specific company

list_traction_signals

List social and web traction signals for a company

search_investors

Search for investment firms and angels

search_startups

Search for startups using filters like industry, location, and headcount

Example Prompts for Harmonic in Claude Desktop

Ready-to-use prompts you can give your Claude Desktop agent to start working with Harmonic immediately.

"Enrich the domain 'openai.com' and show funding rounds."

"Search for startups in 'Artificial Intelligence' with 50-200 employees."

"Show me the portfolio companies for 'Sequoia Capital'."

Troubleshooting Harmonic MCP Server with Claude Desktop

Common issues when connecting Harmonic to Claude Desktop through the Vinkius, and how to resolve them.

Server not appearing after restart

Ensure the JSON is valid (no trailing commas). Check the file path: ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\\Claude\\ (Windows).

Authentication error

Verify your Vinkius token is correct. Go to cloud.vinkius.com to regenerate it if needed.

Tools not showing in chat

Click the 🔌 icon at the bottom of the chat input. If it shows 0 tools, the server may still be connecting. wait a few seconds.

Harmonic + Claude Desktop FAQ

Common questions about integrating Harmonic MCP Server with Claude Desktop.

How does Claude Desktop discover MCP tools?

When Claude Desktop starts, it reads the claude_desktop_config.json file and connects to each configured MCP server. It calls the tools/list endpoint to fetch the schema for every available tool, then surfaces them as clickable options in the chat interface via the 🔌 icon.

What happens if the MCP server is temporarily unavailable?

Claude Desktop handles disconnections gracefully. if the server is unreachable at startup, the tools simply won't appear. Once the server becomes available again, restarting Claude Desktop will re-establish the connection. There is no timeout penalty or error loop.

Can I connect multiple MCP servers simultaneously?

Yes. You can add as many servers as you need in the mcpServers section of the config file. Each server appears as a separate tool provider, and Claude can use tools from multiple servers in a single conversation turn.

Is there a limit on the number of tools per server?

Claude Desktop can handle hundreds of tools per server. However, for optimal LLM performance, Vinkius servers are designed to expose focused, well-documented tool sets rather than overwhelming the model with too many options.

Does Claude Desktop support Streamable HTTP transport?

Yes. Claude Desktop supports both SSE (Server-Sent Events) and the newer Streamable HTTP transport that Vinkius uses. Simply provide the server URL. Claude auto-negotiates the transport protocol.