Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add rshankras/claude-code-apple-skills --skill feature-flagsgit clone --depth 1 https://github.com/rshankras/claude-code-apple-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/rshankras/claude-code-apple-skills/feature-flags)<a href="https://agentmods.dev/skills/rshankras/claude-code-apple-skills/feature-flags"><img src="https://agentmods.dev/badge/skills/rshankras/claude-code-apple-skills/feature-flags.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 53 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Data Exfiltration · line 150 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00039 | $0.02307 |
| Opus 5 | $0.00019 | $0.01154 |
| Sonnet 5 | $0.00008 | $0.00461 |
| Haiku 4.5 | $0.00004 | $0.00231 |
Grade A, and why
feature-flags scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 290 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Feature Flags Generator
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.
When This Skill Activates
Use this skill when the user:
- Asks to "add feature flags" or "add feature toggles"
- Mentions A/B testing or gradual rollouts
- Asks about Firebase Remote Config or similar remote configuration
- Wants to disable features without shipping an app update
- Mentions "kill switches" or "feature gates"
- Wants to control features remotely for a subset of users
- Asks for a debug menu to toggle features during development
Pre-Generation Checks
1. Project Context Detection
- Check for existing feature flag implementations
- Check for Firebase Remote Config or third-party flag SDKs
- Identify source file locations (Sources/, App/, or root)
- Verify minimum deployment target (iOS 17+ / macOS 14+ for @Observable)
2. Conflict Detection
Search for existing feature flag code:
Glob: **/*FeatureFlag*.swift, **/*FeatureToggle*.swift, **/*RemoteConfig*.swift
Grep: "FeatureFlag" or "FeatureToggle" or "RemoteConfig" or "isFeatureEnabled"
If existing feature flag code is found:
- Ask whether to replace or extend the existing implementation
- Check for flag names or enum cases that could conflict
If a third-party SDK (Firebase, LaunchDarkly, etc.) is detected:
- Ask if the user wants a standalone implementation or a wrapper around the SDK
3. Required Capabilities
Feature flags require:
- iOS 17+ / macOS 14+ deployment target (for @Observable manager)
- Network access entitlement if using remote flags
- No special Info.plist entries needed
Configuration Questions
Ask user via AskUserQuestion:
- What features do you want to flag? (freeform)
- Examples: new onboarding, premium paywall, experimental UI, dark mode v2
- This determines the flag enum cases and their default values
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 290 lines · 39 tokens per session scan A 4fa9ef5d1649
feature-flags is a skill published in the GitHub repository rshankras/claude-code-apple-skills (708 stars, last pushed 1mo ago), licensed MIT. It adds 39 tokens to every session and 2,307 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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