chrome-extension SKILL.md skillB
chrome-extension from ericrisco/rsc-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ericrisco/rsc-harness/chrome-extension@git:20260729.3ecb845Pins git:20260729.3ecb845 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ericrisco/rsc-harness
- Path
skills/chrome-extension/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260729.3ecb845, committed Jul 29, 2026
- First version recorded
- Jun 2, 2026
- Size
- 11,043 bytes
- Repository stars
- 236
- License
- MIT
Use when building or shipping a Manifest V3 browser extension and hitting its quirks — service worker dying and losing state, permission warnings, a Chrome Web Store rejection, content-script/worker/popup messaging, or an MV2-to-V3 migration. NOT a generic web app (that is `nextjs`), NOT a desktop shell (that is `electron`).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Chrome extension (Manifest V3) An MV3 extension is **three isolated JavaScript contexts that never share memory and only talk via messages**: 1. **Service worker** (`background.service_worker`) — the logic and lifecycle brain. Ephemeral: Chrome kills it when idle and restarts it on the next event. It has no DOM and no `window`. 2. **Content scripts** — run inside a web page, can read/write that page's DOM, live in an isolated JS world by default. No access to most `chrome.*` APIs except messaging and `storage`. 3. **UI surfaces** — popup (`action.default_popup`), options page, side panel. Normal web pages that load and unload as the user opens/closes them. Internalize that picture first. Most extension bugs are someone treating one of these as if it shared state with another. They do not. The wire between them is `chrome.runtime` messaging and `chrome.storage`. Manifest V3 is the only version the Chrome Web Store accepts; MV2 phase-out began June 2024 and is still rolling out. Build MV3 from the start. ## Pick a skeleton | Setup | Pick when | Cost | |---|---|---| …
Read the whole file at its exact version.
How to install
mdr add ericrisco/rsc-harness/chrome-extension@sha256:9b83c8236571679bThe line at the top of this page pins the label git:20260729.3ecb845, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_mvbjmlb6erxwclut)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jun 2, 2026 and Jul 29, 2026, about one every 57 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260729.3ecb845 latest | 2026-07-29 | 3ecb845 | 11,043 B | B | view · diff |
| git:20260602.59a7176 | 2026-06-02 | 59a7176 | 11,326 B | B | view |
Audit of the latest version
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (11043 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
ericrisco/rsc-harness · 236 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_mvbjmlb6erxwclut GET https://markdownregistry.com/api/v1/resolve?ref=ericrisco/rsc-harness/chrome-extension GET https://markdownregistry.com/api/v1/blob/9b83c8236571679b6e7a10004c7398c0c3c9ba30cdcfc779265143964d805c05
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from ericrisco/rsc-harness
Every file in ericrisco/rsc-harness