FetchSandbox MCP

A deterministic verification engine for software changes that allows agents to prove fixes by failing on old code and passing on new. It connects through MCP to test supported integration workflows using controlled provider sandboxes, enabling teams to verify invariants, test failure scenarios, and inspect evidence for API-heavy teams, background jobs, and services.

Visit FetchSandbox

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Community listingLocal stdioSource reviewed; not executedPublished by FetchSandbox

Vendor documentation

What you can do with it

Verify API integration behavior after code changes
Test failure scenarios like timeouts and retries in a sandbox
Inspect deterministic evidence receipts for bug fixes
Connect verification engine to coding agents via MCP

Source and maintenance

Community listingRegistry 0.7.30

mcp-registry: io.github.fetchsandbox/mcp@0.7.30 Source repository Project website

Maintenance checked: Oct 31, 2026, 10:27 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

fetchsandbox-mcp 0.7.30

npm

fetchsandbox-mcp package definition

{
  "version": "0.7.30",
  "transport": "stdio",
  "identifier": "fetchsandbox-mcp",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "FETCHSANDBOX_API_KEY",
      "format": "string",
      "description": "Sign in using an account API key. Discovery is available anonymously; application planning, verification and managed local tunnels require authentication."
    },
    {
      "name": "FETCHSANDBOX_TELEMETRY",
      "format": "string",
      "description": "Set to '0' to disable anonymous usage telemetry."
    },
    {
      "name": "FETCHSANDBOX_BASE_URL",
      "format": "string",
      "description": "Override the FetchSandbox backend base URL (defaults to https://fetchsandbox.com). Useful for stage/self-hosted testing."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "fetchsandbox-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "fetchsandbox-mcp@0.7.30"
      ],
      "env": {
        "FETCHSANDBOX_API_KEY": "<YOUR_FETCHSANDBOX_API_KEY>",
        "FETCHSANDBOX_TELEMETRY": "<YOUR_FETCHSANDBOX_TELEMETRY>",
        "FETCHSANDBOX_BASE_URL": "<YOUR_FETCHSANDBOX_BASE_URL>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "fetchsandbox-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "fetchsandbox-mcp@0.7.30"
      ],
      "env": {
        "FETCHSANDBOX_API_KEY": "<YOUR_FETCHSANDBOX_API_KEY>",
        "FETCHSANDBOX_TELEMETRY": "<YOUR_FETCHSANDBOX_TELEMETRY>",
        "FETCHSANDBOX_BASE_URL": "<YOUR_FETCHSANDBOX_BASE_URL>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "fetchsandbox-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "fetchsandbox-mcp@0.7.30"
      ],
      "env": {
        "FETCHSANDBOX_API_KEY": "<YOUR_FETCHSANDBOX_API_KEY>",
        "FETCHSANDBOX_TELEMETRY": "<YOUR_FETCHSANDBOX_TELEMETRY>",
        "FETCHSANDBOX_BASE_URL": "<YOUR_FETCHSANDBOX_BASE_URL>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "fetchsandbox-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "fetchsandbox-mcp@0.7.30"
      ],
      "env": {
        "FETCHSANDBOX_API_KEY": "<YOUR_FETCHSANDBOX_API_KEY>",
        "FETCHSANDBOX_TELEMETRY": "<YOUR_FETCHSANDBOX_TELEMETRY>",
        "FETCHSANDBOX_BASE_URL": "<YOUR_FETCHSANDBOX_BASE_URL>"
      }
    }
  }
}

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