these 2 derivations will be built:
  /nix/store/3n5pam4ylqpqh2a9zhjx0hkyc73bpkc8-mcptoon-0.7.22.drv
  /nix/store/zfiykhk5xn87y1i65dz7p196qxbv17hp-check-mcptoon.drv
error: Cannot build '/nix/store/3n5pam4ylqpqh2a9zhjx0hkyc73bpkc8-mcptoon-0.7.22.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/5k7gb9kfh6l8cirhfbxmip87zjckzk5k-mcptoon-0.7.22
         /nix/store/bcbmr2dybsqljpsgwgcfnc6sp1bja6js-mcptoon-0.7.22-dist
       Last 25 log lines:
       >     
       >         if req._tunnel_host:
       >             tunnel_headers = {}
       >             proxy_auth_hdr = "Proxy-Authorization"
       >             if proxy_auth_hdr in headers:
       >                 tunnel_headers[proxy_auth_hdr] = headers[proxy_auth_hdr]
       >                 # Proxy-Authorization should not be sent to origin
       >                 # server.
       >                 del headers[proxy_auth_hdr]
       >             h.set_tunnel(req._tunnel_host, headers=tunnel_headers)
       >     
       >         try:
       >             try:
       >                 h.request(req.get_method(), req.selector, req.data, headers,
       >                           encode_chunked=req.has_header('Transfer-encoding'))
       >             except OSError as err: # timeout error
       > >               raise URLError(err)
       > E               urllib.error.URLError: <urlopen error [Errno -3] Temporary failure in name resolution>
       >
       > /nix/store/d64q19q1xjdwfhqx6czvrjgrhq0n3lcc-python3-3.14.7/lib/python3.14/urllib/request.py:1323: URLError
       > =========================== short test summary info ============================
       > FAILED tests/test_serve.py::TestInstallByName::test_search_registry_returns_list - mcptoon.installer.RegistryError: No MCP registry reachable (smithery: URLEr...
       > FAILED tests/test_serve.py::TestInstallByName::test_search_smithery_returns_list - urllib.error.URLError: <urlopen error [Errno -3] Temporary failure in name ...
       > FAILED tests/test_serve.py::TestInstallByName::test_search_mcp_registry_returns_list - urllib.error.URLError: <urlopen error [Errno -3] Temporary failure in name ...
       > ============= 3 failed, 1323 passed, 1 skipped in 69.88s (0:01:09) =============
       For full logs, run:
         nix log /nix/store/3n5pam4ylqpqh2a9zhjx0hkyc73bpkc8-mcptoon-0.7.22.drv
error: Cannot build '/nix/store/zfiykhk5xn87y1i65dz7p196qxbv17hp-check-mcptoon.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/3wi2g6yfi8afwidngy24kg0a2mxb9g0m-check-mcptoon