<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Medium Risk**
> Test-only change, but it removes coverage for concurrent tool
execution over HTTP, which could let concurrency regressions slip
through unnoticed.
>
> **Overview**
> Removes three async end-to-end integration tests in
`test_end_to_end.py` that asserted **parallel/concurrent tool
execution** timing across the HTTP `POST /mcp` JSON-RPC route, the `POST
/worker/tools/invoke` route, and a mixed MCP+Worker scenario.
>
> No production code changes; remaining HTTP and stdio E2E coverage
stays in place, but the suite no longer validates HTTP concurrency
behavior.
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
3846363488c935771e79e0bb9b946b98137fdc55. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
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