Swift Concurrency Expert
harperreed/dotfiles
Swift Concurrency review and remediation for Swift 6.2+. An agent skill from harperreed/dotfiles.
Swift 6.2 concurrency updates including default MainActor inference, @concurrent for background work, isolated conformances, and approachable concurrency migration.
Install Swift Concurrency Updates
$ npx skills add gustavscirulis/snapgrid --skill swift-concurrency-updates -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install gustavscirulis/snapgrid swift-concurrency-updates --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ 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 .claude/skills/swift-concurrency-updates && rm -rf skills-srcUse ~/.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/
Install the "swift-concurrency-updates" agent skill from https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/swift/concurrency into .claude/skills/swift-concurrency-updates/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "swift-concurrency-updates", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/swift/concurrencyType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add gustavscirulis/snapgrid --skill swift-concurrency-updates -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install gustavscirulis/snapgrid swift-concurrency-updates --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/skills/swift/concurrency .agents/skills/swift-concurrency-updates && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "swift-concurrency-updates" agent skill from https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/swift/concurrency into .agents/skills/swift-concurrency-updates/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "swift-concurrency-updates", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add gustavscirulis/snapgrid --skill swift-concurrency-updates -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install gustavscirulis/snapgrid swift-concurrency-updates --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/skills/swift/concurrency .cursor/skills/swift-concurrency-updates && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "swift-concurrency-updates" agent skill from https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/swift/concurrency into .cursor/skills/swift-concurrency-updates/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "swift-concurrency-updates", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/gustavscirulis/snapgrid.git --path .claude/skills/skills/swift/concurrency--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add gustavscirulis/snapgrid --skill swift-concurrency-updates -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install gustavscirulis/snapgrid swift-concurrency-updates --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/skills/swift/concurrency .gemini/skills/swift-concurrency-updates && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "swift-concurrency-updates" agent skill from https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/swift/concurrency into .gemini/skills/swift-concurrency-updates/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "swift-concurrency-updates", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install gustavscirulis/snapgrid swift-concurrency-updatesInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add gustavscirulis/snapgrid --skill swift-concurrency-updates -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/skills/swift/concurrency .github/skills/swift-concurrency-updates && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "swift-concurrency-updates" agent skill from https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/swift/concurrency into .github/skills/swift-concurrency-updates/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "swift-concurrency-updates", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add gustavscirulis/snapgrid --skill swift-concurrency-updates -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install gustavscirulis/snapgrid swift-concurrency-updates --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/skills/swift/concurrency .opencode/skills/swift-concurrency-updates && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "swift-concurrency-updates" agent skill from https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/swift/concurrency into .opencode/skills/swift-concurrency-updates/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "swift-concurrency-updates", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
swift-concurrency-updates- GitHub stars
- 116
- Used in
- 1 other repo
- Token cost
- ~5.1k tokens
- SKILL.md length
- 1,263 words
- Files
- 1
- Skills in repo
- 118
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Swift 6.2 concurrency updates including default MainActor inference, @concurrent for background work, isolated conformances, and approachable concurrency migration.
- Works in 5 steps: Async Functions Stay on the Calling Actor → Default MainActor Inference Mode → Isolated Conformances → …
- Adopting Swift 6.2 concurrency features
- SKILL.md covers When This Skill Activates, What Changed in Swift 6.2 vs…, 1. Async Functions Stay on the… and 2. Default MainActor Inference…, plus 5 more sections
- Calls swift
What it does
Swift Concurrency Updates is an agent skill from gustavscirulis/snapgrid. Swift 6.2 concurrency updates including default MainActor inference, @concurrent for background work, isolated conformances, and approachable concurrency migration. Use when adopting Swift 6.2 concurrency features or fixing data-race errors.
Its SKILL.md is about 5.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Mobile. 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
- Adopting Swift 6.2 concurrency features
- Fixing data-race errors
Example prompts
- “/swift-concurrency-updates”
Requirements
- Pre-approved tools (allowed-tools): Read, Glob, Grep
Workflow steps
5 steps, taken from the step headings in SKILL.md.
- Async Functions Stay on the Calling Actor
- Default MainActor Inference Mode
- Isolated Conformances
- @concurrent -- Explicit Background Execution
- Migration Guide
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:
ReadGlobGrep
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
swift
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):
swift.orgdocs.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
Swift Concurrency Updates loads about 5.1k tokens when it runs. Until then it costs about 67 tokens; SKILL.md has 1,263 words of instructions outside code blocks.
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 1,263 words (~5,084 tokens).
“Swift 6.2 introduces "Approachable Concurrency" -- a set of changes that make strict concurrency dramatically easier to adopt. The philosophy shifts from "opt in to safety" to "safe by default, opt in to concurrency." Code runs on @MainActor by default…”
- name
- swift-concurrency-updates
- allowed-tools
- Read, Glob, Grep
Files
Just SKILL.md in .claude/skills/skills/swift/concurrency of gustavscirulis/snapgrid.
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
Swift Concurrency Updates 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Swift Concurrency Updates this skillgustavscirulis/snapgrid | 116 | 1 repos | ~5.1k | Automated safety check: Pass | Custom licence | |
| Swift Concurrency Expertharperreed/dotfiles | 334 | 5 repos | ~506 | Automated safety check: Pass | None | |
| Swift Concurrency Expertdavila7/claude-code-templates | 33k | 3 repos | ~1.1k | Automated safety check: Pass | MIT | |
| Swift Concurrencydpearson2699/swift-ios-skills | 1.2k | — | ~5k | Automated safety check: Pass | Custom licence | |
| Swift Concurrency 6 2affaan-m/ECC | 276k | — | ~1.5k | Automated safety check: Pass | MIT | |
| Swift Concurrency 6 2xu-xiang/everything-claude-code-zh | 2k | — | ~1.4k | Automated safety check: Pass | MIT |
Similar skills
Swift Concurrency Expert
davila7/claude-code-templates
Review and fix Swift concurrency issues such as actor isolation and Sendable violations.
Swift Concurrency
dpearson2699/swift-ios-skills
Resolve Swift concurrency compiler errors, adopt approachable concurrency (SE-0466), and write data-race-safe async code.
Swift Concurrency 6 2
affaan-m/ECC
Swift 6.2のアクセシブルな並行処理——デフォルトはシングルスレッド、@concurrentは明示的なバックグラウンドオフロードに使用し、分離の一貫性はMainActor型に使用する。
Swift Concurrency 6 2
xu-xiang/everything-claude-code-zh
Swift 6.2 易用的并发（Approachable Concurrency）—— 默认单线程，使用 @concurrent 进行显式后台卸载，针对主执行角色（Main Actor）类型的隔离一致性。
Swift Best Practices
HoangNguyen0403/agent-skills-standard
Apply Guard, Value Types, Immutability, and Naming conventions in Swift.
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Related
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Questions about Swift Concurrency Updates
What does Swift Concurrency Updates do?
Swift 6.2 concurrency updates including default MainActor inference, @concurrent for background work, isolated conformances, and approachable concurrency migration. Swift Concurrency Updates is an agent skill from gustavscirulis/snapgrid.2 concurrency updates including default MainActor inference, @concurrent for background work, isolated conformances, and approachable concurrency migration.
When should I use Swift Concurrency Updates?
Swift Concurrency Updates fits situations like: adopting Swift 6.2 concurrency features; fixing data-race errors.
How do I install Swift Concurrency Updates in Claude Code?
Run `npx skills add gustavscirulis/snapgrid --skill swift-concurrency-updates -a claude-code`. Or copy the skill folder (.claude/skills/skills/swift/concurrency in gustavscirulis/snapgrid) into .claude/skills/swift-concurrency-updates in your project. Claude Code loads it when a task matches its description.
How do I install Swift Concurrency Updates in Codex?
Run `npx skills add gustavscirulis/snapgrid --skill swift-concurrency-updates -a codex`. Or copy the skill folder (.claude/skills/skills/swift/concurrency in gustavscirulis/snapgrid) into .agents/skills/swift-concurrency-updates in your project. Codex loads it when a task matches its description.
Can I use Swift Concurrency Updates 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 swift-concurrency-updates -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/swift-concurrency-updates, .gemini/skills/swift-concurrency-updates, .github/skills/swift-concurrency-updates and .opencode/skills/swift-concurrency-updates in your project.
What does Swift Concurrency Updates need to run?
Going by SKILL.md and its folder, Swift Concurrency Updates needs the command-line tools its instructions call (swift). Its frontmatter pre-approves these tools: Read, Glob, Grep.
Does Swift Concurrency Updates access the network?
SKILL.md names 2 domains. As links in the text: swift.org and docs.swift.org. This is read from the text; nothing was executed.
Is Swift Concurrency Updates 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 Swift Concurrency Updates use?
Swift Concurrency Updates 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 Swift Concurrency Updates use?
About 5.1k tokens (SKILL.md is roughly 20k 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 Swift Concurrency Updates?
Skills that share tags, products or a category with Swift Concurrency Updates: Swift Concurrency Expert (harperreed/dotfiles, 334 stars), Swift Concurrency Expert (davila7/claude-code-templates, 33k stars), Swift Concurrency (dpearson2699/swift-ios-skills, 1.2k stars) and Swift Concurrency 6 2 (affaan-m/ECC, 276k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Swift Concurrency Updates?
gustavscirulis (a GitHub user) maintains it in gustavscirulis/snapgrid, which has 116 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.