CtrlK
BlogDocsLog inGet started
Tessl Logo

swift-concurrency-6-2

Swift 6.2 Approachable Concurrency — single-threaded by default, @concurrent for explicit background offloading, isolated conformances for main actor types. Use when adopting Swift 6.2 concurrency — offloading with @concurrent or resolving main-actor isolation.

60

Quality

69%

Does it follow best practices?

Run evals on this skill

Adds up to 20 points to the overall score

View guide

SecuritybySnyk

Passed

No findings from the security scan

Fix and improve this skill with Tessl

tessl review fix ./skills/swift-concurrency-6-2/SKILL.md
SKILL.md
Quality
Evals
Security

Quality

Content

67%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A well-structured, actionable skill body with executable Swift examples and a clear migration sequence. It is slightly verbose where it restates concepts across sections, and the migration workflow lacks an explicit validate-and-retry loop despite dealing with compiler-error resolution.

Suggestions

Trim the Key Design Decisions table or fold it into the Core Pattern sections to avoid restating rationale that the preceding sections already explain.

Add an explicit validation checkpoint to the Migration Steps (e.g. 'After each change, rebuild and confirm the data-race errors are gone before moving on') to create a clear validate->fix->retry loop.

Provide a concrete SPM SwiftSettings snippet to match the Xcode build-settings instruction, making the migration fully executable in both toolchains.

DimensionReasoningScore

Conciseness

Mostly efficient with tight code blocks, but sections re-explain Swift 6.1 vs 6.2 behavior and the Key Design Decisions table restates points already made in the Core Pattern sections, adding some padding.

3 / 5

Actionability

Provides multiple copy-paste-ready Swift examples and a concrete numbered recipe for using @concurrent (mark nonisolated, add @concurrent, add async, await); the migration steps reference real build-settings locations, with only minor gaps (e.g. no exact SPM SwiftSettings snippet).

4 / 5

Workflow Clarity

The Migration Steps section gives a clear 6-step sequence and the Anti-Patterns/Best Practices serve as implicit checkpoints; however there is no explicit validate-then-fix feedback loop for confirming the data-race errors are resolved after each change.

4 / 5

Progressive Disclosure

Well-organized with clear section headers and a single self-contained file at one level of depth; no bundle files exist, and the content is appropriately structured for a no-reference skill, though some material (e.g. the full @concurrent deep-dive) could be split into a reference if it grew.

4 / 5

Total

15

/

20

Passed

Description

71%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A strong, specific description tied to a clear niche, with explicit 'what' and 'when' guidance. It leans on technical jargon for triggers and frames capabilities as language semantics rather than enumerated user actions, leaving minor room for more natural trigger phrasing.

Suggestions

Add natural user-facing trigger terms a developer would actually say, e.g. 'data races', 'background threads', or 'MainActor errors', alongside the technical jargon.

Expand the 'Use when' clause to cover more of the activation scenarios named in the body, such as 'migrating from Swift 5.x/6.0/6.1' or 'enabling Approachable Concurrency build settings'.

Consider third-person action verbs for the 'what' (e.g. 'Offloads work with @concurrent, resolves main-actor isolation via isolated conformances') to lift specificity.

DimensionReasoningScore

Specificity

Lists several concrete capabilities — 'single-threaded by default', '@concurrent for explicit background offloading', 'isolated conformances for main actor types' — but the 'what' is framed around language semantics rather than enumerating concrete user-facing actions.

4 / 5

Completeness

Explicitly answers both 'what' (the three concurrency mechanisms) and 'when' via the 'Use when adopting Swift 6.2 concurrency — offloading with @concurrent or resolving main-actor isolation' clause, though the 'when' enumerates only two scenarios.

4 / 5

Trigger Term Quality

Includes relevant terms like 'Swift 6.2 concurrency', '@concurrent', 'main-actor isolation', and 'background offloading', but these are technical jargon; the natural phrases a user would say (e.g. 'data race', 'background thread') are only partly covered.

3 / 5

Distinctiveness Conflict Risk

The Swift 6.2 / Approachable Concurrency niche is highly specific with distinct triggers (@concurrent, main-actor isolation) and minimal overlap risk with other skills.

5 / 5

Total

16

/

20

Passed

Validation

100%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
affaan-m/ECC
Reviewed

Table of Contents

Is this your skill?

If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.