Claude Desktop - OnePerfectSlice

The OnePerfectSlice MCP server is hosted, so there’s no config file to edit and no key to paste. You add it as a custom connector and sign in through your browser.

Connect

Open connector settings

In Claude Desktop, go to Settings → Connectors.

Add a custom connector

Click Add custom connector, then enter:

Name: OnePerfectSlice
URL: https://mcp.oneperfectslice.ai/mcp

Save the connector.

Authenticate

Click Connect on the new connector. Your browser opens to OnePerfectSlice — log in and select the team whose data this connection should access. Claude Desktop receives the token and connects automatically.

Verify

Back in Settings → Connectors, confirm OnePerfectSlice shows as connected.

Test it

Start a new conversation and try:

Use OnePerfectSlice to list available slices

You should see a tool call to list_slices and get back a list of your team’s slices.

Troubleshooting

Problem	Solution
Connector won’t connect	Confirm the URL is exactly `https://mcp.oneperfectslice.ai/mcp`
Browser flow didn’t finish	Complete login and team selection, then click Connect again
Wrong team’s data	Disconnect the connector, reconnect, and select a different team
Tools don’t appear	Fully quit Claude Desktop (Cmd+Q on macOS) and relaunch
Session expired	Tokens refresh automatically; if a call fails, reconnect the connector

Switching teams

Each connection is scoped to one team. To switch, disconnect the connector under Settings → Connectors, reconnect, and select the new team during sign-in.

​Connect

​Test it

​Troubleshooting

​Switching teams

Connect

Test it

Troubleshooting

Switching teams