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dart-modern-features SKILL.md skillA

dart-modern-features from kevmoo/dash_skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add kevmoo/dash_skills/dart-modern-features@git:20260924.0b6371c

Pins git:20260924.0b6371c in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: kevmoo/dash_skills
Path: skills/dart-modern-features/SKILL.md
Versions recorded: 7
Latest version: git:20260924.0b6371c, committed Sep 24, 2026
First version recorded: Jun 5, 2026
Size: 6,458 bytes
Repository stars: 148
License: Apache-2.0

Guidelines for using modern Dart features (v3.0 - v3.10) such as Records, Extension Types, Class Modifiers, Wildcards, Digit Separators, Null-Aware Elements, and Dot Shorthands.

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

# Dart Modern Features

## 1. When to use this skill

Use this skill when:

- Writing or reviewing Dart code targeting Dart 3.0 or later.
- Refactoring legacy Dart code to use modern, concise, and zero-cost features
  such as records, extension types, class modifiers, null-aware collection
  elements, dot shorthands, and digit separators.
- Looking for idiomatic ways to handle multiple return values or zero-cost
  domain wrappers.

For pattern matching, switch expressions, and list/map/split destructuring, use
**[dart-use-pattern-matching]**. For converting closed class hierarchies into
exhaustive `sealed` types, use **[dart-seal-type-hierarchies]**.

### When NOT to use (Abstention Guardrails)

Do NOT apply modern features or refactor code when:

- **SDK Constraint < 3.0.0**: The package's `pubspec.yaml` specifies an SDK
  constraint that supports Dart 2.x (e.g., `sdk: '>=2.19.0 <4.0.0'`).
  Refactoring to Dart 3 features will introduce syntax errors for Dart 2 users.
- **Public API Records with > 3 Fields**: Records work well for 2–3 return
  values or internal tuples, but complex public API payloads are clearer and
  more extensible as dedicated classes or extension types.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add kevmoo/dash_skills/dart-modern-features@sha256:61a9f54eaa44f7e4

The line at the top of this page pins the label git:20260924.0b6371c, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_abewla7j7hprmuo4.svg)](https://markdownregistry.com/a/art_abewla7j7hprmuo4)

1 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 7 versions of this file, between Jun 5, 2026 and Sep 24, 2026, about one every 18 days.

version	committed	commit	size	audit
git:20260924.0b6371c latest	2026-09-24	0b6371c	6,458 B	A	view · diff
git:20260923.d9e03c6	2026-09-23	d9e03c6	11,633 B	A	view · diff
git:20260913.6c39005	2026-09-13	6c39005	9,124 B	A	view · diff
git:20260912.57dc63f	2026-09-12	57dc63f	9,080 B	A	view · diff
git:20260814.65ce674	2026-08-14	65ce674	8,088 B	A	view · diff
git:20260629.1219374	2026-06-29	1219374	6,747 B	A	view · diff
git:20260605.fae9871	2026-06-05	fae9871	6,619 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (6458 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

GitHub

kevmoo/dash_skills · 148 stars · license Apache-2.0 · pushed 2026-11-03 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_abewla7j7hprmuo4
GET https://markdownregistry.com/api/v1/resolve?ref=kevmoo/dash_skills/dart-modern-features
GET https://markdownregistry.com/api/v1/blob/61a9f54eaa44f7e4cbf3f6ff6b59b374082a78344c314540669762e06eae67c9

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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