visual-regression skillA
visual-regression is agent-read markdown (skill) from jnpiyush/agentx: Catch unintended visual drift between prototype iterations with deterministic screenshot diffs. Use when iterating on a prototype, before review handoff, or before promoting an SPA prototype to a real build. Default engine is Playwright `toHaveScreenshot` with masking, threshold, and per-OS baselines. Includes Chromatic / Percy guidance for hosted alternatives..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Visual Regression > WHEN: A prototype is iterated more than once, or before declaring a prototype review-ready. This skill snapshots the key screens at the canonical breakpoints, diffs new builds against an approved baseline, and fails the audit if drift is unintended. Default engine is Playwright; managed services (Chromatic, Percy, Applitools) are listed for teams that prefer hosted review queues. ## When to Use This Skill - Iterating a prototype where each change can shift unrelated screens - Hardening a working SPA prototype that will inform a production build - Catching CSS regressions from token or theme changes - Reviewing a PR that touches global styles or shared components Visual regression complements axe (a11y) and Lighthouse (performance). It does not replace either. ## Authoritative Sources | Source | What it covers | |--------|----------------| | Playwright Test, Visual comparisons | `toHaveScreenshot`, masking, threshold | | Storybook + Chromatic docs | Component-level visual review | | BrowserStack Percy docs | Hosted DOM snapshot + diff | | Applitools Eyes docs | AI-driven layout-aware diff | …
Read the whole file at its exact version.
How to install
mdr add jnpiyush/agentx/visual-regression@v1.0.0mdr add jnpiyush/agentx/visual-regression@sha256:8f73c828b62e4dd6Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_4cugyhtwhtszu5jd)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.0 latest | 2026-09-15 | f17c505 | 8,747 B | A | view · diff |
| v1.0.0 | 2026-05-13 | 173370f | 8,745 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (8747 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
jnpiyush/agentx · 16 stars · license Apache-2.0 · pushed 2026-09-21 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_4cugyhtwhtszu5jd GET https://markdownregistry.com/api/v1/resolve?ref=jnpiyush/agentx/visual-regression GET https://markdownregistry.com/api/v1/blob/8f73c828b62e4dd61be24dacd84a84e4b55d3dd408ed1add4c05cab2a8c9a280
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