FetchSandbox MCP

The MCP that proves your AI's integration fixes work

44 followers

The MCP that proves your AI's integration fixes work

44 followers

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Testing and QA software

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LLM Developer Tools

Your agent's integration fix passes CI. The data is still wrong. FetchSandbox MCP reproduces the real failure on your code, fixes it, and proves the fix held. A receipt, not a vibe. 70+ API sandboxes. One config block in Cursor or Claude Code.

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Forum Threads

p/fetchsandbox-mcp

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19h ago

If all your tests pass, how do you know the running system is actually right?

Spent yesterday adding a new API. 54 tests green. No dangling refs. Then I actually called it.

Four things wrong, none of them raised, none logged, every test stayed green.

What broke

p/fetchsandbox-mcp

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1d ago

Your coding agent says it fixed the bug. That's a claim, not a result.

Agents are pretty good at fixing integration bugs now. They're even better at sounding like they did.

The failure mode I kept hitting: a confident summary of a fix that didn't happen. Or a fix that made the symptom disappear while the data stayed wrong. Swallow the exception, error goes away, test goes green, customer still can't access what they paid for.

So we stopped taking the agent's word for it. Three things now get verified server side:

- Did the app actually run in both states (buggy and fixed)?

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