language-dart SKILL.md skillA
language-dart from lugassawan/swe-workbench is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add lugassawan/swe-workbench/language-dart@git:20260828.71a6399Pins git:20260828.71a6399 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- lugassawan/swe-workbench
- Path
skills/language-dart/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260828.71a6399, committed Aug 28, 2026
- First version recorded
- Jul 2, 2026
- Size
- 5,084 bytes
- Repository stars
- 3
- License
- MIT
Dart idioms — null safety, Futures and Streams, widget composition, and Riverpod app architecture. Auto-load when working with .dart files, pubspec.yaml, or when the user mentions Dart, Flutter, widgets, Riverpod, Streams, or null safety.
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
## Null safety
- Sound null safety is on by default (Dart ≥2.12) — no unsound nulls sneak through.
- Non-nullable is the default; append `?` only when a value can genuinely be absent (`String? name`).
- `late` defers initialization for values assigned before first read (DI fields, `initState` fields) — a `late` field read before assignment throws.
- `!` (null-assertion) asserts non-null; prefer narrowing (`if (x != null)`) or `?.`/`??` over `!`, since `!` throws at runtime.
- `??=` for lazy default assignment; `??` for fallback expressions.
```dart
String greet(String? name) => 'Hello, ${name ?? 'stranger'}';
```
## Async — Futures and Streams
- `Future<T>` wraps a value that arrives later; `async`/`await` reads like sync code.
- Unhandled Future errors surface as unhandled exceptions — always `try`/`catch` around `await`, or attach `.catchError`.
- `Stream<T>` models a sequence over time; `await for` consumes it, `StreamController` produces it.
- `Completer<T>` bridges callback-based APIs into a `Future`.
- `Future.wait([...])` for concurrent futures; don't `await` sequentially in a loop when the work is independent.
```dart
Future<User> fetchUser(String id) async {
…Read the whole file at its exact version.
How to install
mdr add lugassawan/swe-workbench/language-dart@sha256:c0f89e6bc22b65f7The line at the top of this page pins the label git:20260828.71a6399, 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_4zupuwggv43ida7g)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jul 2, 2026 and Aug 28, 2026, about one every 28 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260828.71a6399 latest | 2026-08-28 | 71a6399 | 5,084 B | A | view · diff |
| git:20260719.e1f78e0 | 2026-07-19 | e1f78e0 | 5,108 B | A | view · diff |
| git:20260702.4f4e11d | 2026-07-02 | 4f4e11d | 4,782 B | A | view |
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 (5084 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
lugassawan/swe-workbench · 3 stars · license MIT · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4zupuwggv43ida7g GET https://markdownregistry.com/api/v1/resolve?ref=lugassawan/swe-workbench/language-dart GET https://markdownregistry.com/api/v1/blob/c0f89e6bc22b65f78d4a4783d1604100f06296151a29043f0e415d97c83b19cd
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.