javascript SKILL.md skillA
javascript from alexander-danilenko/cortex-claude-code-plugins is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add alexander-danilenko/cortex-claude-code-plugins/javascript@git:20261013.ecfffa1Pins git:20261013.ecfffa1 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- alexander-danilenko/cortex-claude-code-plugins
- Path
plugins/engineering/cortex-web/skills/javascript/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261013.ecfffa1, committed Oct 13, 2026
- Size
- 3,253 bytes
- Repository stars
- 17
- License
- MIT
Apply these opinionated JavaScript conventions whenever writing or reviewing JS or Node: ESM-first packaging, choosing between Promise combinators, error handling that doesn't swallow failures, AbortController for cancellation, keeping the event loop unblocked, and reaching for platform APIs before dependencies.
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
# JavaScript
House conventions for modern JavaScript and Node. Apply them to code you are writing or changing — don't refactor untouched files to match unless asked.
## Conventions
- **ESM everywhere.** New packages get `"type": "module"`. Mixing CJS and ESM inside one package produces the dual-package hazard — two copies of a module with separate state, failing in ways that read like race conditions.
- **Match the combinator to the intent.** Sequential `await` in a loop serialises independent work; `Promise.all` drops the whole batch on one rejection; `allSettled` is for when partial success is acceptable. The wrong choice is a latency bug or a swallowed-error bug, and both look fine in review.
- **Every `catch` handles or rethrows.** A `catch` that logs and continues converts a failure into corrupt state further downstream, where the stack trace no longer points at the cause. If there is nothing useful to do, don't catch.
- **`AbortController` for anything cancellable** — fetches, timers, streams, listeners (`{ signal }`). Without it an abandoned request keeps its handler and its closure alive.
…Read the whole file at its exact version.
How to install
mdr add alexander-danilenko/cortex-claude-code-plugins/javascript@sha256:f158fc0271c7db2dThe line at the top of this page pins the label git:20261013.ecfffa1, 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_gg326klo6mulp7js)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 13, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3253 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
- pass: No script tag
Source
alexander-danilenko/cortex-claude-code-plugins · 17 stars · license MIT · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_gg326klo6mulp7js GET https://markdownregistry.com/api/v1/resolve?ref=alexander-danilenko/cortex-claude-code-plugins/javascript GET https://markdownregistry.com/api/v1/blob/f158fc0271c7db2d223bbbfc7cc43b0ccdf7c81f2ce96a39f1922ad538ac080d
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.
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