---
name: cross-stack-bugfix
category: primary
description: Diagnoses and fixes bugs that span multiple layers (runtime, CLI, UI, platform, tests) requiring coordinated changes across surfaces. Use when a bug does not map cleanly to a narrower skill, the fix touches more than one surface, or changes need cross-cutting validation.
---

# Cross Stack Bugfix

## Trigger

- A bug spans multiple layers and no narrower primary skill clearly applies
- The fix needs coordinated changes across runtime, CLI, UI, platform, or test surfaces

## Workflow

1. Read change surfaces to identify all impacted layers
2. Diagnose the bug across affected surfaces (runtime, CLI, UI, platform, tests)
3. Implement coordinated fixes across all impacted surfaces
4. Run `make agent-report ENV=cpu CHANGED_FILES="..."` to verify all surfaces are accounted for
5. Promote any remaining mismatches into indexed debt entries

## Gotchas

- Treat this as the fallback skill; if inspection shows a narrower primary skill fits, switch to that more specific contract.
- Fixing the symptom in one layer is not enough when another touched surface still carries the underlying contract mismatch.

## Must Read

- [docs/agent/change-surfaces.md](../../../../docs/agent/change-surfaces.md)

## Standard Commands

- `make agent-report ENV=cpu CHANGED_FILES="..."`
- `make agent-feature-gate ENV=cpu CHANGED_FILES="..."`

## Acceptance

- The final report explicitly names impacted surfaces and intentionally skipped conditional surfaces
- Any real code or spec mismatch left behind is promoted into the matching indexed debt entry
