FetchSandbox

Meet FetchSandbox

FetchSandbox helps engineering teams test whether important system rules still hold after a software change. The workflow starts by defining a checkable invariant, such as avoiding duplicate effects when a job retries, then choosing an isolated environment and the dependencies that can be controlled. Tests introduce conditions such as timeouts, restarts, and concurrent operations.

When a scenario reveals a failure, the team can fix the implementation and run the same checks again. The resulting evidence records the version tested, observed behavior, and remaining gaps. FetchSandbox also describes integration-testing workflows connected to coding agents through MCP. The service is intended to complement ordinary CI with verification tailored to the system and change under review.