Is it possible to disable a task?

[your-diary]

Like this:

healthcheck_prd_env:
    disabled: true # We will enable this task when we have deployed the prd environment.
    cmds:
        - curl https://production.our-server.example.com/healthcheck

Workaround:

• comment out the definition

• use preconditions (though this doesn't hide the task from --list/--list-all):

  preconditions:
      - echo 'This task is currently disabled. Aborting...'; false

[pd93]

There is currently no way to "disable" a task. As you said, commenting the code does the same thing. Are you asking for a dynamic switch to enable/disable tasks? Perhaps you could give more details about your use-case.

[your-diary]

Thank you for you answer.

Are you asking for a dynamic switch to enable/disable tasks?

No.
I'm looking for a way to statically disable a task via a static flag (e.g. disabled: {true|false}).
I don't need condition evaluations like preconditions.

Commenting out task definitions fully covers my requirement except that I personally don't like a file with many commented-out lines for readability (e.g. indentation, syntax highlighting, etc.)

Perhaps you could give more details about your use-case.

I think this may be a rare use-case because I, a 1.5-year-user of go-task, encountered it for the first time today.

Today I defined a task to deploy a service to production environment, but after that, it turned out our devops team hadn't yet created the prd environment in the first place, so I wanted to temporarily disable the task and enable it after some time in the future.

Actually I'm already satisfied with your answer :)
I'll just use one of the workarounds written in the OP.