these 2 derivations will be built:
  /nix/store/mdwnxjhwpvz0vh0p0n1z762gqvzr4gj3-mcptoon-0.8.5.drv
  /nix/store/bzlzcdkpnc5dw4lgx77xakyaqwpx0ap1-check-mcptoon.drv
error: Cannot build '/nix/store/mdwnxjhwpvz0vh0p0n1z762gqvzr4gj3-mcptoon-0.8.5.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/0gfp6m0wcr8vw32vm3mxxz2s3953w3nz-mcptoon-0.8.5-dist
         /nix/store/z57lbhyc0g6n0cgzlm0asm7b6n8l5rx9-mcptoon-0.8.5
       Last 25 log lines:
       > tests/test_v076_stateless_serve.py ...................                   [ 97%]
       > tests/test_v07_spec2026.py .....................                         [ 98%]
       > tests/test_v081_env_headers.py .............                             [ 98%]
       > tests/test_watch.py ..................                                   [100%]
       >
       > =================================== FAILURES ===================================
       > _____ TestThreeCopiesAgree.test_packaged_path_resolves_to_the_copy_on_disk _____
       >
       > self = <tests.test_skill_package.TestThreeCopiesAgree object at 0x7ffff4d85350>
       >
       >     def test_packaged_path_resolves_to_the_copy_on_disk(self):
       >         """`install_self` copies from this path, so it must be the real one."""
       >         resolved = skills.packaged_skill_path()
       >         assert resolved.is_file(), resolved
       > >       assert resolved.resolve() == COPIES["packaged"].resolve()
       > E       AssertionError: assert PosixPath('/nix/store/z57lbhyc0g6n0cgzlm0asm7b6n8l5rx9-mcptoon-0.8.5/lib/python3.14/site-packages/mcptoon/skill/SKILL.md') == PosixPath('/build/source/src/mcptoon/skill/SKILL.md')
       > E        +  where PosixPath('/nix/store/z57lbhyc0g6n0cgzlm0asm7b6n8l5rx9-mcptoon-0.8.5/lib/python3.14/site-packages/mcptoon/skill/SKILL.md') = resolve()
       > E        +    where resolve = PosixPath('/nix/store/z57lbhyc0g6n0cgzlm0asm7b6n8l5rx9-mcptoon-0.8.5/lib/python3.14/site-packages/mcptoon/skill/SKILL.md').resolve
       > E        +  and   PosixPath('/build/source/src/mcptoon/skill/SKILL.md') = resolve()
       > E        +    where resolve = PosixPath('/build/source/src/mcptoon/skill/SKILL.md').resolve
       >
       > tests/test_skill_package.py:86: AssertionError
       > =========================== short test summary info ============================
       > FAILED tests/test_skill_package.py::TestThreeCopiesAgree::test_packaged_path_resolves_to_the_copy_on_disk - AssertionError: assert PosixPath('/nix/store/z57lbhyc0g6n0cgzlm0asm7b6n8l5r...
       > ====== 1 failed, 1731 passed, 5 skipped, 3 deselected in 73.52s (0:01:13) ======
       For full logs, run:
         nix log /nix/store/mdwnxjhwpvz0vh0p0n1z762gqvzr4gj3-mcptoon-0.8.5.drv
error: Cannot build '/nix/store/bzlzcdkpnc5dw4lgx77xakyaqwpx0ap1-check-mcptoon.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/m6gm7b4k23zh12hakin37r16qaa346nx-check-mcptoon