Describe the bug

issue

starting marimo with pixi (pixi.dev) by a given (not existing) playbook name - let the kernel not start:
Kernel exited during startup (exit code 0).

Where on Terminal i see:
Preparing sandbox: '~\AppData\Local\pixi\bin\pixi.EXE' add --script '.\my_script.py' --pypi marimo
Synchronizing sandbox: '~\AppData\Local\pixi\bin\pixi.EXE' install --script '.\my_script.py'
Running kernel in script environment: ~\AppData\Local\rattler\cache\cached-envs-v0\3d-sensor-calib-6c2e3317d28493d3\envs\default
WARN ignoring SSL_CERT_DIR: no certificates found in ~\AppData\Local\rattler\cache\cached-envs-v0\marimo-fdab1b7fd34bbd0a\Library\ssl\certs
[E 261009 21:36:24 ws_endpoint:261] Kernel startup failed: Kernel exited during startup (exit code 0).
[E 261009 21:36:34 load:204] Notebook .\my_script.py is not a valid marimo notebook.
(note: the pathes are trunced)

The "automatically" created playbook (py file):

# /// script
# dependencies = ["marimo"]
# ///

how to reproduce

PS> pixi init
PS> pixi add python marimo
PS> pixi exec marimo edit --sandbox=pixi my_script.py

environment details

{
"marimo": "0.25.1",
"editable": false,
"location": "~/AppData/Local/uv/cache/archive-v0/WskMXq-qlA3QQSju/Lib/site-packages/marimo",
"OS": "Windows",
"OS Version": "11",
"Processor": "Intel64 Family 6 Model 142 Stepping 10, GenuineIntel",
"Python Version": "3.14.8",
"Locale": "de_DE",
"Binaries": {
"Browser": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/154.0.0.0 Safari/537.36",
"Node": "v20.5.1",
"uv": "0.12.24 (x86_64-pc-windows-msvc)"
},
"Dependencies": {
"click": "8.5.0",
"docutils": "0.23",
"itsdangerous": "2.2.0",
"jedi": "0.20.0",
"markdown": "3.11",
"narwhals": "2.26.0",
"packaging": "26.3",
"psutil": "7.2.2",
"pygments": "2.21.0",
"pymdown-extensions": "11.0.2",
"pyyaml": "6.0.3",
"starlette": "1.7.0",
"tomlkit": "0.15.1",
"typing-extensions": "4.16.0",
"uvicorn": "0.54.0",
"websockets": "17.2"
},
"Optional Dependencies": {
"loro": "1.16.2",
"python-lsp-ruff": "2.3.4",
"python-lsp-server": "1.15.0",
"ruff": "0.16.10"
},
"Experimental Flags": {}
}ent log

Will you submit a PR?

• Yes

Environment

{
  "marimo": "0.25.1",
  "editable": false,
  "location": "~/AppData/Local/uv/cache/archive-v0/WskMXq-qlA3QQSju/Lib/site-packages/marimo",
  "OS": "Windows",
  "OS Version": "11",
  "Processor": "Intel64 Family 6 Model 142 Stepping 10, GenuineIntel",
  "Python Version": "3.14.8",
  "Locale": "de_DE",
  "Binaries": {
    "Browser": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/154.0.0.0 Safari/537.36",
    "Node": "v20.5.1",
    "uv": "0.12.24 (x86_64-pc-windows-msvc)"
  },
  "Dependencies": {
    "click": "8.5.0",
    "docutils": "0.23",
    "itsdangerous": "2.2.0",
    "jedi": "0.20.0",
    "markdown": "3.11",
    "narwhals": "2.26.0",
    "packaging": "26.3",
    "psutil": "7.2.2",
    "pygments": "2.21.0",
    "pymdown-extensions": "11.0.2",
    "pyyaml": "6.0.3",
    "starlette": "1.7.0",
    "tomlkit": "0.15.1",
    "typing-extensions": "4.16.0",
    "uvicorn": "0.54.0",
    "websockets": "17.2"
  },
  "Optional Dependencies": {
    "loro": "1.16.2",
    "python-lsp-ruff": "2.3.4",
    "python-lsp-server": "1.15.0",
    "ruff": "0.16.10"
  },
  "Experimental Flags": {}
}

Code to reproduce

PS> pixi init
PS> pixi add python marimo
PS> pixi exec marimo edit --sandbox=pixi my_script.py