Develop Extension
PostHog/posthog-js
Author a new PostHog browser extension, or port a posthog-js v1 extension, against the @posthog/browser-common Client/Extension contract.
“Use this skill when developing or maintaining browser extension code in the `browser/` directory, including Chrome/Firefox/Edge compatibility, content scripts, background…”
Install Repomix Browser Extension Developer
$ npx skills add yamadashy/repomix --skill browser-extension-developer -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install yamadashy/repomix browser-extension-developer --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/yamadashy/repomix.git skills-src && mkdir -p .claude/skills && cp -r skills-src/browser/.claude/skills/browser-extension-developer .claude/skills/browser-extension-developer && 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 "browser-extension-developer" agent skill from https://github.com/yamadashy/repomix/tree/main/browser/.claude/skills/browser-extension-developer into .claude/skills/browser-extension-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "browser-extension-developer", 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/yamadashy/repomix/tree/main/browser/.claude/skills/browser-extension-developerType 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 yamadashy/repomix --skill browser-extension-developer -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install yamadashy/repomix browser-extension-developer --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/yamadashy/repomix.git skills-src && mkdir -p .agents/skills && cp -r skills-src/browser/.claude/skills/browser-extension-developer .agents/skills/browser-extension-developer && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "browser-extension-developer" agent skill from https://github.com/yamadashy/repomix/tree/main/browser/.claude/skills/browser-extension-developer into .agents/skills/browser-extension-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "browser-extension-developer", 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 yamadashy/repomix --skill browser-extension-developer -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install yamadashy/repomix browser-extension-developer --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/yamadashy/repomix.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/browser/.claude/skills/browser-extension-developer .cursor/skills/browser-extension-developer && 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 "browser-extension-developer" agent skill from https://github.com/yamadashy/repomix/tree/main/browser/.claude/skills/browser-extension-developer into .cursor/skills/browser-extension-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "browser-extension-developer", 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/yamadashy/repomix.git --path browser/.claude/skills/browser-extension-developer--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 yamadashy/repomix --skill browser-extension-developer -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install yamadashy/repomix browser-extension-developer --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/yamadashy/repomix.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/browser/.claude/skills/browser-extension-developer .gemini/skills/browser-extension-developer && 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 "browser-extension-developer" agent skill from https://github.com/yamadashy/repomix/tree/main/browser/.claude/skills/browser-extension-developer into .gemini/skills/browser-extension-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "browser-extension-developer", 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 yamadashy/repomix browser-extension-developerInstalls 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 yamadashy/repomix --skill browser-extension-developer -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/yamadashy/repomix.git skills-src && mkdir -p .github/skills && cp -r skills-src/browser/.claude/skills/browser-extension-developer .github/skills/browser-extension-developer && 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 "browser-extension-developer" agent skill from https://github.com/yamadashy/repomix/tree/main/browser/.claude/skills/browser-extension-developer into .github/skills/browser-extension-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "browser-extension-developer", 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 yamadashy/repomix --skill browser-extension-developer -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install yamadashy/repomix browser-extension-developer --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/yamadashy/repomix.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/browser/.claude/skills/browser-extension-developer .opencode/skills/browser-extension-developer && 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 "browser-extension-developer" agent skill from https://github.com/yamadashy/repomix/tree/main/browser/.claude/skills/browser-extension-developer into .opencode/skills/browser-extension-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "browser-extension-developer", 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
browser-extension-developer- GitHub stars
- 29k
- Used in
- 1 other repo
- Token cost
- ~288 tokens
- SKILL.md length
- 84 words
- Files
- 1
- Skills in repo
- 6
- Repo updated
- First seen
- Licence
- MIT
At a glance
- SKILL.md covers Structure, Commands, i18n and Notes
- Calls npm
About this skill
“Use this skill when developing or maintaining browser extension code in the `browser/` directory, including Chrome/Firefox/Edge compatibility, content scripts, background scripts, or i18n updates.”
Repomix Browser Extension Developer is a skill in yamadashy/repomix (29k stars). Its SKILL.md is about 288 tokens, and copies of it appear in 1 other owners' repositories. Licence: MIT.
What it can do on your machine
Read from SKILL.md and the folder at commit 8d64291. 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
Shell commands in SKILL.md call:
npm
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use npm, which can reach the network depending on how they are called.
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
Repomix Browser Extension Developer loads about 288 tokens when it runs. Until then it costs about 56 tokens; SKILL.md has 84 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 yamadashy/repomix at commit 8d64291, republished under its MIT licence (© yamadashy). 84 words, ~288 tokens.
Download SKILL.mdSave it as
.claude/skills/browser-extension-developer/SKILL.md (or your agent's skills folder).- name
- browser-extension-developer
- description
- Use this skill when developing or maintaining browser extension code in the `browser/` directory, including Chrome/Firefox/Edge compatibility, content scripts, background scripts, or i18n updates.
Browser Extension Developer
Cross-browser extension (Chrome/Firefox/Edge) using WXT framework with Manifest V3. Injects "Repomix" button into GitHub repository pages.
Structure
browser/
├── entrypoints/ # background.ts, content.ts
├── public/_locales/ # i18n (12 languages)
├── wxt.config.ts # WXT configuration
└── .output/ # Built files (chrome-mv3, firefox-mv2)Commands
npm run dev- Development mode (Chrome default)npm run dev:firefox- Firefox dev modenpm run build-all- Build all browsersnpm run lint/npm run test
i18n
12 languages: en, ja, de, fr, es, pt_BR, id, vi, ko, zh_CN, zh_TW, hi
New language: Create public/_locales/[code]/messages.json with keys: appDescription, openWithRepomix
Notes
- Chrome/Edge use
chrome.*APIs, Firefox may need polyfills - Run lint and tests before completion
© yamadashy, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in browser/.claude/skills/browser-extension-developer of yamadashy/repomix.
Open the folder on GitHubat commit 8d64291
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in yamadashy/repomix, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Repomix Browser Extension Developer 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 |
|---|---|---|---|---|---|---|
| Repomix Browser Extension Developer this skillyamadashy/repomix | 29k | 1 repos | ~288 | Automated safety check: Pass | MIT | |
| Develop ExtensionPostHog/posthog-js | 613 | — | ~2.3k | Automated safety check: Pass | Custom licence | |
| Freighter Best Practicesstellar/freighter | 118 | — | ~706 | Automated safety check: Pass | Apache-2.0 | |
| Deepseek Automationzhu1090093659/deepseek-pp | 1.9k | — | ~2.1k | Automated safety check: Notes | Apache-2.0 | |
| Commitbiuworks/bilibili-digest | 170 | — | ~450 | Automated safety check: Pass | Custom licence | |
| Release ExtensionYorick-Ryu/deep-share | 144 | — | ~1.3k | Automated safety check: Pass | Custom licence |
Similar skills
- Official
Freighter Best Practices
stellar/freighter
Comprehensive best practices for the Freighter browser extension.
Deepseek Automation
zhu1090093659/deepseek-pp
A skill your agent uses when implementing, resuming, reviewing, or verifying the DeepSeek++ Codex-style automation feature in this repository.
Commit
biuworks/bilibili-digest
用户要求提交、commit、把改动入库，或让你生成/润色提交信息时使用。产出 type 英文 + 中文主题行的 Conventional Commits 提交，并执行本仓库约定：运行时文件先跑 npm test、不自动 push、发版用 release: 并同步三处版本号。
Release Extension
Yorick-Ryu/deep-share
Release browser extensions or similar small packaged apps by upgrading a semantic version, packaging build artifacts, creating a git commit and tag, pushing to the remote, and publishing a GitHub…
Upgrade Packages
maotoumao/Cebian
调研 package.json 所有依赖的最新版本，交叉验证版本差异，给出可升级到最新版的结论. An agent skill from maotoumao/Cebian.
More from yamadashy/repomix
Contextual Commit Messages
yamadashy/repomix
Writes Conventional Commits whose bodies carry action lines recording the intent, decisions and constraints behind a change, not only what changed.
Agent Carnet Notebook
yamadashy/repomix
Saves and recalls markdown notes between agent sessions with the agent-carnet CLI, tracking which notes proved useful so stale ones expire and good ones stay.
Repomix Codebase Explorer
yamadashy/repomix
Packs a local or remote repository into a single AI-friendly file with the Repomix CLI, then reads and searches that output to explain structure, find patterns or report metrics.
Repomix Codebase Packer
yamadashy/repomix
Packs a local directory or remote GitHub repository into one AI-friendly file with Repomix, then searches it to explore structure, find patterns and count tokens.
Repomix Website Maintainer
yamadashy/repomix
Guides edits to the Repomix documentation site's VitePress configuration, per-language content, and translation workflow across 14 languages.
Related
Works with
Categories
Questions about Repomix Browser Extension Developer
How do I install Repomix Browser Extension Developer in Claude Code?
Run `npx skills add yamadashy/repomix --skill browser-extension-developer -a claude-code`. Or copy the skill folder (browser/.claude/skills/browser-extension-developer in yamadashy/repomix) into .claude/skills/browser-extension-developer in your project. Claude Code loads it when a task matches its description.
How do I install Repomix Browser Extension Developer in Codex?
Run `npx skills add yamadashy/repomix --skill browser-extension-developer -a codex`. Or copy the skill folder (browser/.claude/skills/browser-extension-developer in yamadashy/repomix) into .agents/skills/browser-extension-developer in your project. Codex loads it when a task matches its description.
Can I use Repomix Browser Extension Developer 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 yamadashy/repomix --skill browser-extension-developer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/browser-extension-developer, .gemini/skills/browser-extension-developer, .github/skills/browser-extension-developer and .opencode/skills/browser-extension-developer in your project.
What does Repomix Browser Extension Developer need to run?
Going by SKILL.md and its folder, Repomix Browser Extension Developer needs the command-line tools its instructions call (npm).
Does Repomix Browser Extension Developer access the network?
SKILL.md contains no URLs. Its commands use npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Repomix Browser Extension Developer 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 Repomix Browser Extension Developer use?
Repomix Browser Extension Developer 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 Repomix Browser Extension Developer use?
About 288 tokens (SKILL.md is roughly 1.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Repomix Browser Extension Developer?
Skills that share tags, products or a category with Repomix Browser Extension Developer: Develop Extension (PostHog/posthog-js, 613 stars), Freighter Best Practices (stellar/freighter, 118 stars), Deepseek Automation (zhu1090093659/deepseek-pp, 1.9k stars) and Commit (biuworks/bilibili-digest, 170 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Repomix Browser Extension Developer?
yamadashy (a GitHub user) maintains it in yamadashy/repomix, which has 28,742 GitHub stars. The repository holds 6 skills in this directory. The repository was last updated on October 3, 2026.
Source: yamadashy/repomix on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.