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Chrome Extension Manifest V3 Development · modu-ai | DecimalAI

codingby modu-ai

Chrome Extension Manifest V3 Development

modu-ai/moai-platform-chrome-extension

Source modu-ai/moai-adk ↗License Apache-2.0

Chrome Extension Manifest V3 development specialist covering service workers, content scripts, message passing, chrome.* APIs, side panel, declarativeNetRequest, and Chrome Web Store publishing.

NewMaintained

Automatic

Frontend / UI pack

Last verified 8/15/2026

What it changes

Passed 21 of 22 test cases with the skill, and 21 of 22 without it.

Without skill95%

With skill95%

Checks it passed that the model alone missed

Specify 64 MiB as the maximum payload serialization limit for Chrome message passing

1 fixed20 passed either way0 still failing1 broke

Pass-rate lift: 0 pp
Tokens: +222%
Agent turns: 0%
Response time: -17%

Model gemini-3.6-flashMeasured 8/15/2026v121 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/modu-ai-moai-platform-chrome-extension/SKILL.md https://app.decimal.ai/s/modu-ai-moai-platform-chrome-extension/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add modu-ai-moai-platform-chrome-extension, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/modu-ai-moai-platform-chrome-extension/ and pins it in .decimal/skills.lock

decimalai skills add modu-ai-moai-platform-chrome-extension

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/modu-ai-moai-platform-chrome-extension/SKILL.md https://app.decimal.ai/s/modu-ai-moai-platform-chrome-extension/SKILL.md

Raw file: /s/modu-ai-moai-platform-chrome-extension/SKILL.md ↗ · machine-readable summary at /s/modu-ai-moai-platform-chrome-extension.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

A test case the skill fixed. Same model, same prompt, with and without the skill.

Prompt

My content script is trying to pass a massive raw video binary array directly to the service worker through `chrome.runtime.sendMessage`, but the message fails. What is the maximum message size limit for Chrome message passing?

What was checked, without and with the skill
Checked	Without skill	With skill
Specify 64 MiB as the maximum payload serialization limit for Chrome message passing	Missed	Passed

case-21 · gemini-3.6-flash · 8/15/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md333 linessingle file

Chrome Extension Manifest V3 Development

Quick Reference

Chrome Extension Manifest V3 Development Specialist enables building modern browser extensions with the latest Chrome platform APIs.

Auto-Triggers: Chrome extension projects detected via manifest.json with manifest_version 3, service worker files, content script declarations, chrome API usage patterns

Core Capabilities

Manifest V3 Platform:

Service workers replace persistent background pages for event-driven architecture
Remote code execution removed for enhanced security
declarativeNetRequest replaces blocking webRequest for network filtering
Promise-based API methods across all chrome.* APIs
action API unifies browserAction and pageAction into single surface
Supported in Chrome 88 and later

Process Architecture:

Service worker runs as single event-driven background script terminating when idle
Content scripts execute in web page context within isolated worlds
Popup and side panel provide dedicated UI surfaces
Options page provides extension settings interface
DevTools panel extends Chrome Developer Tools

Communication Patterns:

One-time messages between service worker and content scripts via sendMessage
Long-lived connections via connect with port-based communication
Cross-extension messaging through externally_connectable declaration
Web page to extension messaging for verified origins

Security Model:

Content Security Policy restricts script sources to self only
No inline scripts or remote code execution permitted
Permissions declare required API access at install time
Optional permissions allow runtime-requested access with user consent

Track record

Benchmark

21 / 22

test cases passed, vs 21 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

modu-ai / moai-adk

.moai/archive/skills/v2.16/moai-platform-chrome-extension/SKILL.md

View on GitHub ↗

License Apache-2.0Imported 8/3/2026Version v1

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See it in action

What's inside

Chrome Extension Manifest V3 Development

Quick Reference

Core Capabilities

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

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