Production Audit
affaan-m/ECC
Local-evidence production readiness audit for shipped apps, pre-launch reviews, post-merge checks, and "what breaks in prod?" questions without sending repo data to an external audit service.
A skill your agent uses when auditing repeat-visit performance, adding offline support, or evaluating PWA readiness for a web application.
MITAuto-check passed
Install Service Worker
$ npx skills add thedaviddias/Front-End-Checklist --skill service-worker -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist service-worker --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/service-worker .claude/skills/service-worker && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "service-worker" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/service-worker into .claude/skills/service-worker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "service-worker", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/service-workerType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add thedaviddias/Front-End-Checklist --skill service-worker -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist service-worker --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/service-worker .agents/skills/service-worker && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "service-worker" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/service-worker into .agents/skills/service-worker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "service-worker", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add thedaviddias/Front-End-Checklist --skill service-worker -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist service-worker --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/service-worker .cursor/skills/service-worker && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "service-worker" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/service-worker into .cursor/skills/service-worker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "service-worker", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/thedaviddias/Front-End-Checklist.git --path skills/service-worker--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add thedaviddias/Front-End-Checklist --skill service-worker -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist service-worker --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/service-worker .gemini/skills/service-worker && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "service-worker" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/service-worker into .gemini/skills/service-worker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "service-worker", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install thedaviddias/Front-End-Checklist service-workerInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add thedaviddias/Front-End-Checklist --skill service-worker -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/service-worker .github/skills/service-worker && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "service-worker" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/service-worker into .github/skills/service-worker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "service-worker", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add thedaviddias/Front-End-Checklist --skill service-worker -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install thedaviddias/Front-End-Checklist service-worker --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/service-worker .opencode/skills/service-worker && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "service-worker" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/service-worker into .opencode/skills/service-worker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "service-worker", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
service-worker- GitHub stars
- 74k
- Token cost
- ~478 tokens
- SKILL.md length
- 208 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when auditing repeat-visit performance, adding offline support, or evaluating PWA readiness for a web application.
- Auditing repeat-visit performance
- SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Adding offline support
What it does
Service Worker is an agent skill from thedaviddias/Front-End-Checklist. Use when auditing repeat-visit performance, adding offline support, or evaluating PWA readiness for a web application.
Its SKILL.md is about 480 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).
The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.
When your agent uses it
- Auditing repeat-visit performance
- Adding offline support
- Evaluating PWA readiness for a web application
Example prompts
- “/service-worker”
What it can do on your machine
Read from SKILL.md and the folder at commit e8d14d0. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
frontendchecklist.io
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Service Worker loads about 478 tokens when it runs, and up to ~2.7k if it reads all its reference files. Until then it costs about 33 tokens; SKILL.md has 208 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 208 words, ~478 tokens.
Download SKILL.mdSave it as
.claude/skills/service-worker/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- service-worker
- description
- Use when auditing repeat-visit performance, adding offline support, or evaluating PWA readiness for a web application.
- metadata.category
- performance
- metadata.priority
- medium
- metadata.difficulty
- intermediate
- metadata.estimatedTime
- 60
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/performance/service-worker
Register a service worker for caching and offline support
Service workers act as a programmable network proxy between the browser and the network. They eliminate repeated server round-trips for static assets, cut load times on repeat visits by 50–90 %, and allow the app to function at all on flaky or offline networks — which is critical for users on mobile or low-bandwidth connections.
Quick Reference
- Register a service worker in your main JavaScript entry point
- Use an install event to pre-cache critical static assets
- Choose a caching strategy (cache-first, network-first, stale-while-revalidate) per resource type
- Implement an activate event to clean up old caches on update
Check
Check whether a service worker is registered and whether it caches static assets, API responses, or provides an offline fallback.
Fix
Add a service worker registration call and implement appropriate caching strategies for static assets and navigation requests.
Explain
Explain how service workers intercept network requests and how different caching strategies trade off freshness vs. speed.
Code Review
Review the service worker file and its registration. Flag missing install/ activate lifecycle handlers, absent cache-versioning, missing fetch handlers, and any patterns that could cause stale content to be served indefinitely.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/performance/service-worker
© thedaviddias, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file (references) in skills/service-worker of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Service Worker next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Service Worker this skillthedaviddias/Front-End-Checklist | 74k | — | ~478 | Automated safety check: Pass | MIT | |
| Production Auditaffaan-m/ECC | 277k | 1 repos | ~1.9k | Automated safety check: Pass | MIT | |
| Aims Auditalirezarezvani/claude-skills | 28k | — | ~1.3k | Automated safety check: Pass | MIT | |
| Geo Auditsickn33/agentic-awesome-skills | 47k | 1 repos | ~3.4k | Automated safety check: Notes | MIT | |
| OmniRoute Audit and Policy CLIdiegosouzapw/OmniRoute | 75k | — | ~733 | Automated safety check: Pass | MIT | |
| Audit Preparationsickn33/agentic-awesome-skills | 47k | 1 repos | ~5.3k | Automated safety check: Pass | MIT |
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Qms Audit Expert
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Questions about Service Worker
What does Service Worker do?
A skill your agent uses when auditing repeat-visit performance, adding offline support, or evaluating PWA readiness for a web application. Service Worker is an agent skill from thedaviddias/Front-End-Checklist. Use when auditing repeat-visit performance, adding offline support, or evaluating PWA readiness for a web application.
When should I use Service Worker?
Service Worker fits situations like: auditing repeat-visit performance; adding offline support; evaluating PWA readiness for a web application.
How do I install Service Worker in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill service-worker -a claude-code`. Or copy the skill folder (skills/service-worker in thedaviddias/Front-End-Checklist) into .claude/skills/service-worker in your project. Claude Code loads it when a task matches its description.
How do I install Service Worker in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill service-worker -a codex`. Or copy the skill folder (skills/service-worker in thedaviddias/Front-End-Checklist) into .agents/skills/service-worker in your project. Codex loads it when a task matches its description.
Can I use Service Worker in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add thedaviddias/Front-End-Checklist --skill service-worker -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/service-worker, .gemini/skills/service-worker, .github/skills/service-worker and .opencode/skills/service-worker in your project.
What does Service Worker need to run?
SKILL.md names no scripts, command-line tools or credentials: Service Worker is instructions for the agent only.
Does Service Worker access the network?
SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.
Is Service Worker safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Service Worker use?
Service Worker is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Service Worker use?
About 478 tokens (SKILL.md is roughly 1.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 2.2k tokens, read only when the agent opens those files.
What are the alternatives to Service Worker?
Skills that share tags, products or a category with Service Worker: Production Audit (affaan-m/ECC, 277k stars), Aims Audit (alirezarezvani/claude-skills, 28k stars), Geo Audit (sickn33/agentic-awesome-skills, 47k stars) and OmniRoute Audit and Policy CLI (diegosouzapw/OmniRoute, 75k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Service Worker?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,421 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.
Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.