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Agent skill

Feature Flags

by gustavscirulis in gustavscirulis/snapgrid

Generate feature flag infrastructure with local defaults, remote configuration, SwiftUI integration, and debug menu.

Custom licenceAuto-check: notesMobile

Install Feature Flags

skills CLI
$ npx skills add gustavscirulis/snapgrid --skill feature-flags -a claude-code

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

GitHub CLI
$ gh skill install gustavscirulis/snapgrid feature-flags --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/generators/feature-flags .claude/skills/feature-flags && 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
feature-flags
GitHub stars
117
Used in
1 other repo
Token cost
~2.6k tokens
SKILL.md length
880 words
Files
2
Skills in repo
118
Repo updated
First seen
Licence
Custom licence

At a glance

Generate feature flag infrastructure with local defaults, remote configuration, SwiftUI integration, and debug menu.

  • Works in 6 steps: Project Context Detection → Conflict Detection → Required Capabilities → …
  • Adding feature flags
  • SKILL.md covers When This Skill Activates, Pre-Generation Checks, Configuration Questions and Generation Process, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Feature Flags is an agent skill from gustavscirulis/snapgrid. Generate feature flag infrastructure with local defaults, remote configuration, SwiftUI integration, and debug menu. Use when adding feature flags or A/B testing to iOS/macOS apps.

Its SKILL.md is about 2.6k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `templates.md`).

It sits in Mobile, covering A/B testing and iOS development. It works with iOS, macOS, SwiftUI and Firebase. 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

  • Adding feature flags
  • A/B testing to iOS/macOS apps

Example prompts

  • “/feature-flags”

Requirements

  • Pre-approved tools (allowed-tools): Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion

Workflow steps

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

  1. Project Context Detection
  2. Conflict Detection
  3. Required Capabilities
  4. Determine File Locations
  5. Create Core Files
  6. Generate Code from Templates

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
    • Write
    • Edit
    • Glob
    • Grep
    • Bash
    • AskUserQuestion

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are 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):

    • martinfowler.com
    • firebase.google.com

    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

Feature Flags loads about 2.6k tokens when it runs. Until then it costs about 49 tokens; SKILL.md has 880 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~49
When it runs · the whole SKILL.md, loaded when a task matches
~2.6k

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: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion

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 880 words (~2,560 tokens).

“Generate a complete feature flag infrastructure with typed flag definitions, protocol-based providers (local, remote, composite), SwiftUI environment integration, an @Observable manager, and a debug menu for toggling flags at runtime.”

— opening of SKILL.md by gustavscirulis, Custom licence
name
feature-flags
allowed-tools
Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file in .claude/skills/skills/generators/feature-flags of gustavscirulis/snapgrid.

  • SKILL.md
  • templates.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

Feature Flags 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.

Feature Flags compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Feature Flags this skillgustavscirulis/snapgrid1171 repos~2.6kAutomated safety check: NotesCustom licence
Swiftui Expert Skillomarshahine/HomeClaw1764 repos~2.8kAutomated safety check: PassMIT
Hig Project Contextraintree-technology/hig-doctor1435 repos~1.2kAutomated safety check: PassMIT
Swiftui Expert SkillEslzzyl/Pixiv-SwiftUI1111 repos~2.9kAutomated safety check: PassAGPL-3.0
Hig Components Contentraintree-technology/hig-doctor1435 repos~1.3kAutomated safety check: PassMIT
SwiftUI Design SkillWholiver/swiftui-design-skill210—~2.8kAutomated safety check: PassMIT

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All 118 skills in this repo

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  • Force Update

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  • Market Research

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  • Account Deletion

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    Generates an Apple-compliant account deletion flow with multi-step confirmation UI, optional data export, configurable grace period, Keychain cleanup, and server-side deletion request.

    117 GitHub starsUsed in 1 repo~2.5k tokens
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  • Alarmkit

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    AlarmKit integration for scheduling alarms and timers with custom UI, Live Activities, and snooze support.

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Works with

Categories

Questions about Feature Flags

What does Feature Flags do?

Generate feature flag infrastructure with local defaults, remote configuration, SwiftUI integration, and debug menu. Feature Flags is an agent skill from gustavscirulis/snapgrid. Generate feature flag infrastructure with local defaults, remote configuration, SwiftUI integration, and debug menu.

When should I use Feature Flags?

Feature Flags fits situations like: adding feature flags; A/B testing to iOS/macOS apps.

How do I install Feature Flags in Claude Code?

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

How do I install Feature Flags in Codex?

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

Can I use Feature Flags 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 feature-flags -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/feature-flags, .gemini/skills/feature-flags, .github/skills/feature-flags and .opencode/skills/feature-flags in your project.

What does Feature Flags need to run?

SKILL.md names no scripts, command-line tools or credentials: Feature Flags is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion.

Does Feature Flags access the network?

SKILL.md names 2 domains. As links in the text: martinfowler.com and firebase.google.com. This is read from the text; nothing was executed.

Is Feature Flags safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Feature Flags use?

Feature Flags 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 Feature Flags use?

About 2.6k tokens (SKILL.md is roughly 10k 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 Feature Flags?

Skills that share tags, products or a category with Feature Flags: Swiftui Expert Skill (omarshahine/HomeClaw, 176 stars), Hig Project Context (raintree-technology/hig-doctor, 143 stars), Swiftui Expert Skill (Eslzzyl/Pixiv-SwiftUI, 111 stars) and Hig Components Content (raintree-technology/hig-doctor, 143 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Feature Flags?

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.