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Agent skill

Concurrency Patterns

by gustavscirulis in gustavscirulis/snapgrid

Swift concurrency patterns including Swift 6.2 approachable concurrency, structured concurrency, actors, continuations, and migration.

Custom licenceAuto-check passedDevelopment

Install Concurrency Patterns

skills CLI
$ npx skills add gustavscirulis/snapgrid --skill concurrency-patterns -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install gustavscirulis/snapgrid concurrency-patterns --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/skills/swift/concurrency-patterns .claude/skills/concurrency-patterns && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
concurrency-patterns
GitHub stars
117
Used in
1 other repo
Token cost
~1.2k tokens
SKILL.md length
391 words
Files
6
Skills in repo
118
Repo updated
First seen
Licence
Custom licence

At a glance

Swift concurrency patterns including Swift 6.2 approachable concurrency, structured concurrency, actors, continuations, and migration.

  • Works in 4 steps: Identify the Problem → Load Relevant Reference Files → Review Checklist → …
  • Building async code
  • SKILL.md covers When This Skill Activates, Decision Tree, Quick Reference and Process, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Concurrency Patterns is an agent skill from gustavscirulis/snapgrid. Swift concurrency patterns including Swift 6.2 approachable concurrency, structured concurrency, actors, continuations, and migration. Use when reviewing or building async code, fixing data race errors, or migrating to Swift 6.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files (for example `actors-and-isolation.md`, `continuations-bridging.md` and `migration-guide.md`).

It sits in Development, covering Async programming and iOS development. It works with Swift. The repository describes itself as: SnapGrid is an open-source Mac app for collecting, organizing, and analyzing UI screenshots. It uses AI to automatically detect UI components and patterns, making it a powerful…

When your agent uses it

  • Building async code
  • Fixing data race errors
  • Migrating to Swift 6

Example prompts

  • “/concurrency-patterns”

Requirements

  • Pre-approved tools (allowed-tools): Read, Glob, Grep

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Identify the Problem
  2. Load Relevant Reference Files
  3. Review Checklist
  4. Cross-Reference

What it can do on your machine

Read from SKILL.md and the folder at commit eb7eaf4. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Glob
    • Grep

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • docs.swift.org
    • swift.org

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Concurrency Patterns loads about 1.2k tokens when it runs. Until then it costs about 62 tokens; SKILL.md has 391 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~62
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 391 words (~1,226 tokens).

“Comprehensive guide for Swift concurrency covering async/await, structured concurrency, actors, and the Swift 6.2 "Approachable Concurrency" features. Focuses on patterns that prevent data races and common mistakes that cause crashes.”

— opening of SKILL.md by gustavscirulis, Custom licence
name
concurrency-patterns
allowed-tools
Read, Glob, Grep

Read the full SKILL.md on GitHub

Files

SKILL.md and 5 other files in .claude/skills/skills/swift/concurrency-patterns of gustavscirulis/snapgrid.

  • SKILL.md
  • actors-and-isolation.md
  • continuations-bridging.md
  • migration-guide.md
  • structured-concurrency.md
  • swift62-concurrency.md

Open the folder on GitHubat commit eb7eaf4

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in gustavscirulis/snapgrid, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Concurrency Patterns next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Concurrency Patterns compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Concurrency Patterns this skillgustavscirulis/snapgrid1171 repos~1.2kAutomated safety check: PassCustom licence
Swift Concurrencyhenrypldev/react-native-nitro-mlx1003 repos~3.1kAutomated safety check: PassMIT
Swift Concurrencynimblehq/ios-templates110—~1.7kAutomated safety check: PassMIT
Swift Concurrencyjamesrochabrun/skills216—~1.9kAutomated safety check: PassMIT
Swift Concurrency Protwostraws/Swift-Concurrency-Agent-Skill558—~1.4kAutomated safety check: PassMIT
Modern Swiftjohnrogers/claude-swift-engineering231—~1kAutomated safety check: PassMIT

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Works with

Categories

Questions about Concurrency Patterns

What does Concurrency Patterns do?

Swift concurrency patterns including Swift 6.2 approachable concurrency, structured concurrency, actors, continuations, and migration. Concurrency Patterns is an agent skill from gustavscirulis/snapgrid.2 approachable concurrency, structured concurrency, actors, continuations, and migration.

When should I use Concurrency Patterns?

Concurrency Patterns fits situations like: building async code; fixing data race errors; migrating to Swift 6.

How do I install Concurrency Patterns in Claude Code?

Run `npx skills add gustavscirulis/snapgrid --skill concurrency-patterns -a claude-code`. Or copy the skill folder (.claude/skills/skills/swift/concurrency-patterns in gustavscirulis/snapgrid) into .claude/skills/concurrency-patterns in your project. Claude Code loads it when a task matches its description.

How do I install Concurrency Patterns in Codex?

Run `npx skills add gustavscirulis/snapgrid --skill concurrency-patterns -a codex`. Or copy the skill folder (.claude/skills/skills/swift/concurrency-patterns in gustavscirulis/snapgrid) into .agents/skills/concurrency-patterns in your project. Codex loads it when a task matches its description.

Can I use Concurrency Patterns in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add gustavscirulis/snapgrid --skill concurrency-patterns -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/concurrency-patterns, .gemini/skills/concurrency-patterns, .github/skills/concurrency-patterns and .opencode/skills/concurrency-patterns in your project.

What does Concurrency Patterns need to run?

SKILL.md names no scripts, command-line tools or credentials: Concurrency Patterns is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Glob, Grep.

Does Concurrency Patterns access the network?

SKILL.md names 2 domains. As links in the text: docs.swift.org and swift.org. This is read from the text; nothing was executed.

Is Concurrency Patterns safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Concurrency Patterns use?

Concurrency Patterns has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Concurrency Patterns use?

About 1.2k tokens (SKILL.md is roughly 4.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Concurrency Patterns?

Skills that share tags, products or a category with Concurrency Patterns: Swift Concurrency (henrypldev/react-native-nitro-mlx, 100 stars), Swift Concurrency (nimblehq/ios-templates, 110 stars), Swift Concurrency (jamesrochabrun/skills, 216 stars) and Swift Concurrency Pro (twostraws/Swift-Concurrency-Agent-Skill, 558 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Concurrency Patterns?

gustavscirulis (a GitHub user) maintains it in gustavscirulis/snapgrid, which has 117 GitHub stars. The repository holds 118 skills in this directory. The repository was last updated on April 30, 2026.

Source: gustavscirulis/snapgrid on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.