these 2 derivations will be built:
  /nix/store/iyvpyjlf7vd0xmw3pi8sxlcg8hp3cmdw-mcptoon-0.8.7.drv
  /nix/store/dh7ns42vz93dakh4b38v5q9vnrrr5170-check-mcptoon.drv
error: build of '/nix/store/iyvpyjlf7vd0xmw3pi8sxlcg8hp3cmdw-mcptoon-0.8.7.drv' on 'grpc://farm.numtide.com:50051?client-cert=/run/secrets/vars/per-machine/bld1/nix-farm-ci/crt&client-key=/run/secrets/vars/per-machine/bld1/nix-farm-ci/key&connect-timeout=23&system=aarch64-linux' failed: Cannot build '/nix/store/iyvpyjlf7vd0xmw3pi8sxlcg8hp3cmdw-mcptoon-0.8.7.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/sqgsxnfdsjzi0na5ny3ds9lrf2mwifkb-mcptoon-0.8.7
         /nix/store/zyvhf87y5hgm263rc7kddkkk4iv0xxi4-mcptoon-0.8.7-dist
       Last 25 log lines:
       > =================================== FAILURES ===================================
       > ________ TestDeadServerStderrSurfaces.test_process_died_includes_stderr ________
       >
       > self = <tests.test_demo_dead_package.TestDeadServerStderrSurfaces testMethod=test_process_died_includes_stderr>
       >
       >     def test_process_died_includes_stderr(self):
       >         """Real subprocess: stderr tail reaches the MCPError message."""
       >         client = MCPClient(stdio=_DEAD_SERVER_CMD, timeout=10)
       >         try:
       >             with self.assertRaises(MCPError) as cm:
       >                 client.initialize()
       >         finally:
       >             try:
       >                 client.close()
       >             except Exception:
       >                 pass
       > >       self.assertEqual(cm.exception.code, "PROCESS_DIED")
       > E       AssertionError: 'RESPONSE_TIMEOUT' != 'PROCESS_DIED'
       > E       - RESPONSE_TIMEOUT
       > E       + PROCESS_DIED
       >
       > tests/test_demo_dead_package.py:86: AssertionError
       > =========================== short test summary info ============================
       > FAILED tests/test_demo_dead_package.py::TestDeadServerStderrSurfaces::test_process_died_includes_stderr - AssertionError: 'RESPONSE_TIMEOUT' != 'PROCESS_DIED'
       > ===== 1 failed, 1739 passed, 11 skipped, 4 deselected in 103.41s (0:01:43) =====
       For full logs, run:
         nix log /nix/store/iyvpyjlf7vd0xmw3pi8sxlcg8hp3cmdw-mcptoon-0.8.7.drv
error: Cannot build '/nix/store/iyvpyjlf7vd0xmw3pi8sxlcg8hp3cmdw-mcptoon-0.8.7.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/sqgsxnfdsjzi0na5ny3ds9lrf2mwifkb-mcptoon-0.8.7
         /nix/store/zyvhf87y5hgm263rc7kddkkk4iv0xxi4-mcptoon-0.8.7-dist
error: Cannot build '/nix/store/dh7ns42vz93dakh4b38v5q9vnrrr5170-check-mcptoon.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/vjk3kk82x7g4nkla1w91y8b3qgpa7p5f-check-mcptoon