GitHub Copilot Chat's agent mode reads MCP servers from .vscode/mcp.json in the workspace.
json
{
"servers": {
"index": {
"type": "http",
"url": "https://mcp.index.webenta.sk/mcp",
"headers": { "Authorization": "Bearer YOUR_API_KEY" }
}
}
}Open Chat → Agent → Tools and tick index. Use #index to mention it inline.