Connect claude.ai to 2,500+ apps — no installation needed

Mushrooms is viaSocket's MCP server platform that connects Claude to 2,500+ apps like Google Sheets, Slack, Gmail, and HubSpot via a single secure URL.

This guide covers connecting Mushrooms to Claude Web (claude.ai) using the custom connector feature — no app installation required.

Complete these steps first. They are the same regardless of how you connect Claude.

Step 1: Go to Mushrooms

Open mushroom.viasocket.com in your browser. Click "+ Add New App" to begin.

Step 2: Choose Your AI Client

A modal will appear. Select Claude from the list. The selection highlights with a border and "Claude selected" appears at the bottom. Click Done to proceed.

Step 3: Add Mushrooms (Apps)

You land on the Mushrooms dashboard. Click "+ Browse Integrations" to open the integration catalogue.

Step 4: Pick an App from the Catalogue

Search or scroll to find the app you need — Google Sheets, Slack, Gmail, HubSpot, and 2,500+ more. Click on it to open its configuration screen.

Step 5: Authorize & Select Triggers & Actions

In the authentication pop-up, toggle the triggers and actions you want active. Mushrooms pre-selects sensible defaults based on your previous connections.

Scroll down click the “Next”, the authorization pop-up will open — sign in and grant permissions. Once authorized, you’ll be returned to the app’s configuration screen.

Step 6: Configure App Actions

Each app offers two options:

• Enable Everything (AI-Powered) — Claude automatically decides which actions to use.

• Configure Actions manually — pick only the specific actions you want to expose (e.g., Add New Row, Get Row Details, Delete Row).

Once the actions are configured, scroll down and click the “Enable” button.

Step 7: Copy Your MCP Configuration

Back on the dashboard your mushrooms (app) appears under Clusters. Scroll down to the Claude Configuration panel at the bottom of the page.

The Claude Configuration panel shows two items:

• MCP Endpoint URL — a unique HTTPS URL for your cluster.

• JSON config block — the full JSON for Claude Desktop.

Copy the MCP Endpoint URL (the plain HTTPS URL shown at the top of the Claude Configuration panel). You will paste this into Claude Web in the next steps.

Step 1: Open Connectors Settings

Go to claude.ai. In the left sidebar, click Customize → Connectors. You will see a list of available connectors (Canva, Figma,
Google Drive, etc.) and a "Not connected" section.

Step 2: Add a Custom Connector

Click the + (Add) icon next to the Connectors heading. The "Add custom connector" modal opens.

Step 3: Fill in Name and URL

Complete the two fields:

• Name — enter a clear label, e.g. "Mushrooms – Google Sheets" or "viaSocket MCP".

• Remote MCP server URL — paste the MCP Endpoint URL you copied from Mushrooms.

Step 4: Click Add

Click Add. Claude Web connects to your Mushrooms cluster immediately. The connector appears as active in your list and Claude can now act on all your configured apps.