2

I am looking for a phrase to convey the activity in such a scenario:

I found a very interesting question on StackOverflow but know I cannot provide a satisfying answer at that moment. I was too busy to do some research on it and write an elaborate answer but I wanted to write a sketchy one and flesh it into a detailed one later when time permits.

I think, flag planning which was used in this case, would not be a good match here:

Posting on ArXiv is good, flag planting notwithstanding.

In Chinese we call it "占个坑" which means literally to occupy a pit latrine but don't really need to poop right off.

3

A single word that describes this idea is placeholder:

1 : a person or thing that occupies the position or place of another person or thing

// The bill would empower the governor to appoint a placeholder to a vacant U.S. Senate seat, to serve through the next general election cycle.
— John Sharp

// The result was that the legislation represented little more than a placeholder to put the budget before a conference committee . . .
— Carl Ingram

In your sentence:

Posting on ArXiv is good, placeholders notwithstanding.

Or (if actually posting one):

This is just a placeholder for my eventual answer.

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