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Configure

Create .vscode/mcp.json in your workspace. Note that VS Code uses servers (not mcpServers), and supports prompted inputs so the key never sits in the file: 
{
  "inputs": [
    {
      "type": "promptString",
      "id": "seesaw-key",
      "description": "SeeSaw API key (sspat_…)",
      "password": true
    }
  ],
  "servers": {
    "seesaw": {
      "type": "http",
      "url": "https://api.seesaw.fun/mcp",
      "headers": {
        "Authorization": "Bearer ${input:seesaw-key}"
      }
    }
  }
}
VS Code prompts for the key on first start and stores it securely.

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Verify

Open the Chat view in agent mode and check the tools picker — the seesaw server should list 14 tools. Then try:
Who’s on top of the SeeSaw global leaderboard?

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Troubleshooting

SymptomLikely cause
Server won’t startUsing mcpServers instead of servers, or JSON syntax error
Auth errorWrong key entered at the prompt — run “MCP: Reset cached inputs” from the command palette
Tool errors mentioning retryRate limited — see Rate limits