Create a focused regression plan

---
name: "aboutcodex-regression-plan"
description: "Build a risk-based regression plan for a change without duplicating implementation details. Use when the user asks what to test before merging or publishing a change."
---

# Create a focused regression plan

Build a risk-based regression plan for a change without duplicating implementation details.

## Workflow

1. Describe the changed behavior, its direct consumers, and the state or data it touches.
2. Rank credible failure paths by impact and likelihood using the diff and architecture.
3. Select focused checks for the change, shared-component checks for propagation, and one critical end-to-end path.
4. Include viewport, permission, empty-state, and failure cases only where the change can affect them.
5. Define observable pass criteria and a rollback or containment signal.

Read `references/NOTES.md` before finalizing the work. Follow project instructions and the user's authorized scope. Use available evidence, label assumptions, and never report a check as passing unless it actually ran.

## Deliverable

A prioritized, executable set of checks with clear pass evidence. State material limitations and link to changed files or rendered evidence when available.