FetchSandbox

io.github.fetchsandboxv0.5.9Updated Sep 24, 2026

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

VerifiedStreamable HTTPWeb executableDeveloper Tools

Installation

In SourceWeft

  1. Open FetchSandbox in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Other MCP clients

Add this to your client's mcpServers config.

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

Tools

0
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Version history

5
  1. v0.5.9LatestSep 23, 2026
  2. v0.5.7Sep 21, 2026
  3. v0.5.6Sep 18, 2026
  4. v0.5.5Sep 18, 2026
  5. v0.5.3Sep 16, 2026