By name: proper-fix description: Bias bug fixes and refactors toward root-cause solutions, simplification, and removal of workaround layers. Use when Codex is fixing a bug, flaky behavior, confusing edge case, or ugly conditional pileup and the obvious change looks like another patch on top of earlier patches, defensive code, or duplicated repair logic.
Proper Fix
Overview
Diagnose the underlying failure before editing. Prefer the smallest coherent fix at the source of truth over adding another compensating condition, fallback, or band-aid downstream.
Work The Problem
Start by proving what is actually wrong.
- Reproduce the failure, trace the data flow, or read the full call chain before editing.
- Read the surrounding code, not just the failing line. Look for where the invariant should have been enforced earlier.
- Identify whether the current behavior comes from stale assumptions, split ownership, duplicated normalization, or state being repaired too late.
- Name the root cause in one sentence before choosing a fix. If you cannot do that, keep reading.
Dig Deeper Signals
Pause and inspect the design one layer deeper when any of these show up:
- The fix wants a second special case beside an existing special case.
- The code already contains words like
workaround,temporary,legacy,hotfix, orcompat. - Multiple places sanitize, default, or repair the same value.
- State becomes valid only after several follow-up mutations.
- Tests only pass when setup mirrors production accidents instead of clear rules.
- The proposed patch hides the bug instead of making invalid states impossible.
Prefer These Fix Shapes
Reach for the earliest, simplest place that can make the bad state impossible.
- Tighten the data shape where it is created or parsed.
- Move validation or normalization to the boundary instead of repeating it at call sites.
- Collapse duplicate branches into one explicit rule.
- Replace repair logic with a single authoritative state transition.
- Rewrite a small confusing section if that is clearer than threading another exception through the system.
- Delete obsolete fallback logic when the source issue is fixed.
Keep Scope Coherent
Do not turn "proper fix" into "rewrite the world."
- Prefer a local rewrite when it removes complexity inside the touched area.
- Stop expanding once the fix reaches unrelated subsystems with no direct evidence.
- If the real fix is too large for the task, make the smallest honest change and say clearly what compromise remains.
- Preserve intentional external behavior unless the user asks to change it.
- If you are choosing between a quick patch and a slightly deeper simplification, spend one more short investigation pass first.
Report The Fix Clearly
When you answer or summarize the change:
- State the root cause directly.
- State why the chosen fix is earlier, simpler, or more authoritative than the obvious patch.
- Mention any workaround code you removed or any compromise you left in place.