# Plan a Chrome CSS Inspector Extension

Planning a browser CSS inspector requires decisions about overlay isolation, inspection metrics, and extension architecture. This guide outlines those decisions without supplying executable extension source.

## Install

```bash
npx skillstore add nexaiguy/nex-color-spy-ext
```

## Metadata

- Status: approved
- Slug: nexaiguy-nex-color-spy-ext
- Version: 1.2
- Author version: 1.2
- Skillstore revision: r1
- Version status: invalid
- Tree hash: 3a5db336fe34c13a19164c51db4dcd99bd85d989587a2207e869e80578055c22
- Author: nexaiguy
- GitHub username: nexaiguy
- License: MIT
- Repository: https://github.com/nexaiguy/nex-ai-skills/tree/463aaff26593654193deb52f24d18e80ec21e323/skills/nex-color-spy-ext
- Ref: 3ddfdca559084abffbfdd188f2ba14b597dcfd9c
- Supported tools: Claude, Codex, Claude Code
- Audit status: complete
- Agent install advisory: allowed
- Manual install advisory: allowed
- Artifact signature: available
- Audit attestation: unavailable
- Human verification: not\_verified
- Risk factors: network
- Quality score: 77
- Quality tier: bronze
- Public page: https://skillstore.pages.dev/skills/nexaiguy-nex-color-spy-ext
- Manifest: https://skillstore.pages.dev/api/skills/nexaiguy-nex-color-spy-ext/manifest

## Capabilities

- Describe a Manifest V3 architecture using a service worker and a Shadow DOM inspector overlay.
- Identify inspection targets including colors, font families, font sizes, margins, padding, and dimensions.
- Outline a vanilla JavaScript development workflow without a build tool.
- Explain Chrome Developer mode and unpacked extension loading for separately obtained source files.
- Document proposed clipboard copying, keyboard toggles, and settings persistence.
- Identify stated limits involving protected browser pages, canvas, and SVG internals.

## Use Cases

- Plan an inspector prototype: Translate the documented overlay, metrics, and toggle features into requirements for a new Chrome extension.
- Define design inspection needs: List the typography, spacing, and color values a proposed inspection tool should expose.
- Study extension development: Use the guide to discuss Manifest V3, Shadow DOM isolation, and unpacked loading before implementing an extension.

## Prompt Templates

### Understand the guide

```
Summarize the inspector described in this guide. Separate documented features from files actually included, and explain what is missing.
```

### Define inspection requirements

```
Create a requirements checklist for a CSS inspector covering colors, fonts, spacing, dimensions, clipboard copying, and keyboard toggling. Include the documented limitations.
```

### Plan the extension architecture

```
Propose a Manifest V3 architecture for the described inspector using vanilla JavaScript and Shadow DOM. Label implementation proposals separately from documented facts.
```

### Design a verification plan

```
Develop a verification plan for a future implementation covering permissions, clipboard actions, settings persistence, overlay isolation, and protected pages. Do not claim tests passed.
```

## Limitations

- Only SKILL.md is included; scripts, extension source, and templates are absent.
- Runtime behavior, clipboard handling, permissions, and Chrome Web Store readiness cannot be verified from this guide.
- The described inspector does not support canvas or SVG internals and has limited access to browser-protected pages.
- The documented workflow uses vanilla JavaScript and does not cover React or Vue build steps.

## Best Practices

- Confirm that extension source is available before planning installation or packaging.
- Treat advertised features as requirements until an implementation and its permissions have been reviewed.
- Test any future implementation on ordinary pages, complex layouts, and browser-protected pages.

## Anti Patterns

- Assuming the guide includes a working extension or executable templates.
- Claiming Chrome Web Store approval, runtime safety, or successful tests without implementation evidence.
- Expecting the documented inspector to inspect canvas internals or bypass browser page restrictions.

## Security Audit

- Audited at: 2026-11-02T12:14:37.696\+00:00
- Summary: All five static findings are false positives: attribution links and ordinary extension-development prose do not establish network execution or system reconnaissance. No evidence found of prompt injection, credential access, or data exfiltration in the reviewed guide. Extension source is explicitly absent, so its runtime security cannot be assessed.

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