Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/yamadashy/repomix/browser-extension-developernpx skills add yamadashy/repomix --skill browser-extension-developergit clone --depth 1 https://github.com/yamadashy/repomixWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00043 | $0.00306 |
| Opus 5 | $0.00022 | $0.00153 |
| Sonnet 5 | $0.00009 | $0.00061 |
| Haiku 4.5 | $0.00004 | $0.00031 |
Grade A, and why
browser-extension-developer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
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
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 37 lines · 43 tokens per session scan A 321c1470b387
browser-extension-developer is a skill published in the GitHub repository yamadashy/repomix (28,125 stars, last pushed 2d ago), licensed MIT. It adds 43 tokens to every session and 306 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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