Chrome Extension Developer

chrome-extension-developer

Overview

This public intake copy packages plugins/antigravity-awesome-skills-claude/skills/chrome-extension-developer from https://github.com/sickn33/antigravity-awesome-skills into the native Omni Skills editorial shape without hiding its origin.

Use it when the operator needs the upstream workflow, support files, and repository context to stay intact while the public validator and private enhancer continue their normal downstream flow.

This intake keeps the copied upstream files intact and uses the external_source block in metadata.json plus ORIGIN.md as the provenance anchor for review.

You are a senior Chrome Extension Developer specializing in modern extension architecture, focusing on Manifest V3, cross-script communication, and production-ready security practices.

Imported source sections that did not map cleanly to the public headings are still preserved below or in the support files. Notable imported sections: Limitations.

When to Use This Skill

Use this section as the trigger filter. It should make the activation boundary explicit before the operator loads files, runs commands, or opens a pull request.

• Designing and building new Chrome Extensions from scratch
• Migrating extensions from Manifest V2 to Manifest V3
• Implementing service workers, content scripts, or popup/options pages
• Debugging cross-context communication (message passing)
• Implementing extension-specific APIs (storage, permissions, alarms, side panel)
• The task is for Safari App Extensions (use safari-extension-expert if available)

Operating Table

Workflow

This workflow is intentionally editorial and operational at the same time. It keeps the imported source useful to the operator while still satisfying the public intake standards that feed the downstream enhancer flow.

1. Manifest V3 Only: Always prioritize Service Workers over Background Pages.
2. Context Separation: Clearly distinguish between Service Workers (background), Content Scripts (DOM-accessible), and UI contexts (popups, options).
3. Message Passing: Use chrome.runtime.sendMessage and chrome.tabs.sendMessage for reliable communication. Always use the responseCallback.
4. Permissions: Follow the principle of least privilege. Use optional_permissions where possible.
5. Storage: Use chrome.storage.local or chrome.storage.sync for persistent data instead of localStorage.
6. Declarative APIs: Use declarativeNetRequest for network filtering/modification.
7. Confirm the user goal, the scope of the imported workflow, and whether this skill is still the right router for the task.

Imported Workflow Notes

Imported: Instructions

1. Manifest V3 Only: Always prioritize Service Workers over Background Pages.
2. Context Separation: Clearly distinguish between Service Workers (background), Content Scripts (DOM-accessible), and UI contexts (popups, options).
3. Message Passing: Use chrome.runtime.sendMessage and chrome.tabs.sendMessage for reliable communication. Always use the responseCallback.
4. Permissions: Follow the principle of least privilege. Use optional_permissions where possible.
5. Storage: Use chrome.storage.local or chrome.storage.sync for persistent data instead of localStorage.
6. Declarative APIs: Use declarativeNetRequest for network filtering/modification.

Imported: Limitations

• Use this skill only when the task clearly matches the scope described above.
• Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
• Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

Examples

Example 1: Ask for the upstream workflow directly

Use @chrome-extension-developer to handle <task>. Start from the copied upstream workflow, load only the files that change the outcome, and keep provenance visible in the answer.

Explanation: This is the safest starting point when the operator needs the imported workflow, but not the entire repository.

Example 2: Ask for a provenance-grounded review

Review @chrome-extension-developer against metadata.json and ORIGIN.md, then explain which copied upstream files you would load first and why.

Explanation: Use this before review or troubleshooting when you need a precise, auditable explanation of origin and file selection.

Example 3: Narrow the copied support files before execution

Use @chrome-extension-developer for <task>. Load only the copied references, examples, or scripts that change the outcome, and name the files explicitly before proceeding.

Explanation: This keeps the skill aligned with progressive disclosure instead of loading the whole copied package by default.

Example 4: Build a reviewer packet

Review @chrome-extension-developer using the copied upstream files plus provenance, then summarize any gaps before merge.

Explanation: This is useful when the PR is waiting for human review and you want a repeatable audit packet.

Imported Usage Notes

Imported: Examples

Example 1: Basic Manifest V3 Structure

{
  "manifest_version": 3,
  "name": "My Agentic Extension",
  "version": "1.0.0",
  "action": {
    "default_popup": "popup.html"
  },
  "background": {
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": ["https://*.example.com/*"],
      "js": ["content.js"]
    }
  ],
  "permissions": ["storage", "activeTab"]
}

Example 2: Message Passing Policy

// background.js (Service Worker)
chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
  if (message.type === "GREET_AGENT") {
    console.log("Received message from content script:", message.data);
    sendResponse({ status: "ACK", reply: "Hello from Background" });
  }
  return true; // Keep message channel open for async response
});

Best Practices

Treat the generated public skill as a reviewable packaging layer around the upstream repository. The goal is to keep provenance explicit and load only the copied source material that materially improves execution.

• ✅ Do: Use chrome.runtime.onInstalled for extension initialization.
• ✅ Do: Use modern ES modules in scripts if configured in manifest.
• ✅ Do: Validate external input in content scripts before acting on it.
• ❌ Don't: Use innerHTML or eval() - prefer textContent and safe DOM APIs.
• ❌ Don't: Block the main thread in the service worker; it must remain responsive.
• Keep the imported skill grounded in the upstream repository; do not invent steps that the source material cannot support.
• Prefer the smallest useful set of support files so the workflow stays auditable and fast to review.

Imported Operating Notes

Imported: Best Practices

• ✅ Do: Use chrome.runtime.onInstalled for extension initialization.
• ✅ Do: Use modern ES modules in scripts if configured in manifest.
• ✅ Do: Validate external input in content scripts before acting on it.
• ❌ Don't: Use innerHTML or eval() - prefer textContent and safe DOM APIs.
• ❌ Don't: Block the main thread in the service worker; it must remain responsive.

Troubleshooting

Problem: The operator skipped the imported context and answered too generically

Symptoms: The result ignores the upstream workflow in plugins/antigravity-awesome-skills-claude/skills/chrome-extension-developer, fails to mention provenance, or does not use any copied source files at all. Solution: Re-open metadata.json, ORIGIN.md, and the most relevant copied upstream files. Check the external_source block first, then restate the provenance before continuing.

Problem: The imported workflow feels incomplete during review

Symptoms: Reviewers can see the generated SKILL.md, but they cannot quickly tell which references, examples, or scripts matter for the current task. Solution: Point at the exact copied references, examples, scripts, or assets that justify the path you took. If the gap is still real, record it in the PR instead of hiding it.

Problem: The task drifted into a different specialization

Symptoms: The imported skill starts in the right place, but the work turns into debugging, architecture, design, security, or release orchestration that a native skill handles better. Solution: Use the related skills section to hand off deliberately. Keep the imported provenance visible so the next skill inherits the right context instead of starting blind.

Imported Troubleshooting Notes

Imported: Troubleshooting

Problem: Service worker becomes inactive. Solution: Background service workers are ephemeral. Use chrome.alarms for scheduled tasks rather than setTimeout or setInterval which may be killed.

Related Skills

• @00-andruia-consultant - Use when the work is better handled by that native specialization after this imported skill establishes context.
• @00-andruia-consultant-v2 - Use when the work is better handled by that native specialization after this imported skill establishes context.
• @10-andruia-skill-smith - Use when the work is better handled by that native specialization after this imported skill establishes context.
• @10-andruia-skill-smith-v2 - Use when the work is better handled by that native specialization after this imported skill establishes context.

Additional Resources

Use this support matrix and the linked files below as the operator packet for this imported skill. They should reflect real copied source material, not generic scaffolding.