Nothing to paste? —
an intermittent production-only KeyError in a small Flask checkout service, with the
traceback, the module it points into, and the deploy that preceded it. Or
,
rendered from a saved reply with no run and no charge.
Paste the evidence
Symptoms, the stack trace, log fragments, the code the trace points into, and what changed recently. The quick scanner flags what a good bug report still misses, free in your browser. No sign-in needed for that.
Get ranked hypotheses
Every hypothesis is tied to evidence in your paste — a frame, a line, a phrase like "only in production" — and rated High, Medium or Low with the cheapest test that confirms or kills it. Nothing generic, nothing invented — and your browser checks it: every identifier or file:line a hypothesis quotes as evidence is looked up in your paste, and anything that is not there is flagged above the plan.
Run the experiments
Cheapest and most discriminating first, each naming what its result would mean. Plus the exact instrumentation to add and the fix each hypothesis implies — conditional until confirmed, concrete once the mechanism is visible.