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pause-point: raising the collection preview cap requires re-creating the marker and discards trace history #2391

Description

@hatayama

Background

Usability-feedback round 24 (2026-08-24, revision 9cefd73). Reported at 4/10 with 2 wasted round trips.

Problem

--captured-variables full clips collection previews at the cap fixed when the pause point was enabled. When a trace run reveals that the clipped tail is exactly what the user needs, the only way to see more elements is to clear the marker and enable a new one with a larger cap — which discards the accumulated hit history that made the investigation possible in the first place.

Proposal

Either of:

  • Allow updating the preview cap on an existing marker (keeping history), or
  • At minimum, when the response reports ElementsTruncated, include guidance stating the current cap, how to raise it, and that re-creating the marker resets history — so the trade-off is visible before the user destroys their trace.

Severity

4/10 (workaround exists but silently costs the collected history).

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