Custom templates seems ignored when creating sandbox from template

[marcospassos]

Hi there, I've been trying to use the SDK for the past three days but haven't had any success.

It looks like the template I created is simply being ignored when I create a new sandbox. My project requires Node.js 22+, so I followed the documentation to define a minimal template:

.codesandbox/template.json

{
  "title": "Node.js",
  "description": "Custom Node.js template.",
  "tags": ["node", "javascript", "croct"],
  "published": false
}

.codesandbox/tasks.json

{
  "setupTasks": [
    "npm install",
    "npm install croct@latest -g"
  ]
}

.devcontainer/devcontainer.json

{
  "name": "Node.js",
  "image": "mcr.microsoft.com/devcontainers/javascript-node:22",
  "features": {
    "ghcr.io/devcontainers/features/python:1": {}
  }
}

I then published the template using:

npx @codesandbox/sdk build template

And created the sandbox like this:

const sandbox = await sdk.sandboxes.create({
  source: 'template',
  id: '<id>',
  privacy: 'unlisted',
});

Everything runs without errors, but the Node version inside the shell still returns v20:

const command = await session.commands.run("node -v");

Also, it seems like the npm install task hasn't been run either.

What am I missing here?

Beside this, most of my attempts failed due to unexpected errors when publishing template, which is out of my control and quickly consumed my usage quota.

Example:

[cluster: fc-us-1, sandboxId: wsylfs]: Restarting sandbox...
[cluster: fc-eu-0, sandboxId: tgxs3d]: Snapshot created
[cluster: fc-us-3, sandboxId: qfrwtx]: Setup step failed: Starting containers
Error: Setup step failed: Starting containers
    at node_modules/@codesandbox/sdk/dist/bin/codesandbox.cjs:53273:23
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async Promise.all (index 2)
    at async Object.handler (node_modules/@codesandbox/sdk/dist/bin/codesandbox.cjs:53194:26)

This forced me to wait hours before trying again, even after emailing to request a limit increase so I could evaluate whether it fits our use case.

Is there any specific email I should use to get support for quota issues?