angular-visual-regression-testing

A review guide for checking visual regression coverage in shared Angular component libraries. Visual regression testing compares screenshots over time to catch unintended appearance changes.

In plain words
What is it for?
Use it to assess Storybook coverage, screenshots, review of visual differences, and CI rules for shared Angular components.
Why use it?
It finds gaps that ordinary tests may miss, such as changed spacing, colors, states, themes, or component layouts.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/agenticpawan/fullstack-pilot/angular-visual-regression-testing
Any agent
npx skills add AgenticPawan/FullStack-Pilot --skill angular-visual-regression-testing
Clone the repo
git clone --depth 1 https://github.com/AgenticPawan/FullStack-Pilot

Made for: Claude Code, Codex.

Per session 98 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,287 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00098 $0.02287
Opus 5 $0.00049 $0.01144
Sonnet 5 $0.00020 $0.00457
Haiku 4.5 $0.00010 $0.00229

Measured yesterday against content hash d16387d0a755, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

angular-visual-regression-testing scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/pilot-angular/skills/angular-visual-regression-testing/SKILL.md · 250 lines

How it starts

The opening of the file, as written. The whole thing — 250 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Standard IDs

ID Severity What it checks
VRT-001 P1 Shared component library has no Storybook (or equivalent) documenting variants/states
VRT-002 P1 No visual regression tooling catching unintended pixel-level style changes
VRT-003 P2 Stories only cover the default/happy-path state, missing loading/error/empty/disabled
VRT-004 P1 Visual regression baselines auto-accepted in CI with no human review/approval
VRT-005 P2 Theme variants (light/dark/brand) not covered by visual regression snapshots
VRT-006 P0 No CI gate blocking merge on an unreviewed visual diff for shared-library components

angular-shared-libraries and angular-shared-ui-kit establish what a shared component must support (form-factory building blocks, a generic data table, dialogs, toasts, confirmation prompts). This skill is about proving that contract holds visually, release after release — a shared ButtonComponent used on 40 screens can regress silently in a one-line SCSS change, and nothing in a unit test suite would ever notice.


Check A — No Storybook (or equivalent) for the shared component library (VRT-001)

Detection

Check whether the shared component library (the same library angular-shared-libraries extracts form factories/data tables into, and angular-shared-ui-kit extracts dialogs/toasts/confirmations into) has a .storybook/ config and a *.stories.ts file per exported component. Without an isolated playground, the only way to see a component's full variant surface (size, state, theme) is to hunt down every screen that happens to use it — and some variants (error state on a rarely-hit form) may not be reachable in the running app at all.

BAD — shared library ships components with no isolated playground

libs/ui-kit/
├── src/lib/button/button.component.ts
├── src/lib/dialog/dialog.component.ts
└── src/lib/data-table/data-table.component.ts
<!-- No .storybook/, no *.stories.ts anywhere. The only way to see every button variant
     is to grep the app for <ui-button> usages and hope you found them all. -->

Read the full file on GitHub · 250 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 250 lines · 98 tokens per session scan A d16387d0a755

Subscribe to this mod's changes

angular-visual-regression-testing is a skill published in the GitHub repository AgenticPawan/FullStack-Pilot (2 stars, last pushed 1mo ago), licensed MIT. It adds 98 tokens to every session and 2,287 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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