FetchSandbox for VS Code

io.github.fetchsandbox/mcp

A deterministic verification engine for agents. Proves a fix: fails on the old code, passes on new.

client:VS Code transport:streamable-http runtime:npm tools:17

Install FetchSandbox in VS Code

.vscode/mcp.json

{
  "servers": {
    "mcp": {
      "type": "http",
      "url": "https://fetchsandbox.com/mcp/v1"
    }
  }
}

Requires agent mode. MCP: Open User Configuration puts the same block in every workspace. VS Code docs