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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.

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Connect

1

Open connector settings

In Claude Desktop, go to Settings → Connectors.
2

Add a custom connector

Click Add custom connector, then enter:
  • Name: OnePerfectSlice
  • URL: https://mcp.oneperfectslice.ai/mcp
Save the connector.
3

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.
4

Verify

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

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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.

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Troubleshooting

ProblemSolution
Connector won’t connectConfirm the URL is exactly https://mcp.oneperfectslice.ai/mcp
Browser flow didn’t finishComplete login and team selection, then click Connect again
Wrong team’s dataDisconnect the connector, reconnect, and select a different team
Tools don’t appearFully quit Claude Desktop (Cmd+Q on macOS) and relaunch
Session expiredTokens refresh automatically; if a call fails, reconnect the connector

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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.