AppBootstrapAI: Skill for Claude Code

.claude/skills/swift-logging-pro/SKILL.md

swift-logging-pro is a skill for Claude Code from kelvinkosbab/AppBootstrapAI. It costs 34 tokens per session (754 once invoked), scanned A, original, MIT.

A review aid for Swift code that records messages with Apple’s os.Logger system. It checks message privacy, logger naming, and whether the chosen level matches the event.

In plain words
What is it for?
Use it when writing or reviewing Swift logging, including logger setup, interpolated values, log levels, and accidental print statements.
Why use it?
It helps prevent sensitive information from appearing in logs and keeps production logging consistent and useful.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is kelvinkosbab/AppBootstrapAI's own configuration. It tells Claude Code how to work on AppBootstrapAI itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything AppBootstrapAI configures →

Reuse

Borrowing it

Nothing to install: this file belongs to kelvinkosbab/AppBootstrapAI. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/kelvinkosbab/AppBootstrapAI/main/.claude/skills/swift-logging-pro/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/kelvinkosbab/AppBootstrapAI

Made for: Claude Code.

Wrote 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.

agentmods badge for swift-logging-pro

README.md
[![agentmods](https://agentmods.dev/badge/skills/kelvinkosbab/appbootstrapai/swift-logging-pro/github.svg)](https://agentmods.dev/skills/kelvinkosbab/appbootstrapai/swift-logging-pro)
Your own site
<a href="https://agentmods.dev/skills/kelvinkosbab/appbootstrapai/swift-logging-pro"><img src="https://agentmods.dev/badge/skills/kelvinkosbab/appbootstrapai/swift-logging-pro/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for swift-logging-pro

Your own site · 80×15
<a href="https://agentmods.dev/skills/kelvinkosbab/appbootstrapai/swift-logging-pro"><img src="https://agentmods.dev/badge/skills/kelvinkosbab/appbootstrapai/swift-logging-pro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 754 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00034 $0.00754
Opus 5 $0.00017 $0.00377
Sonnet 5 $0.00007 $0.00151
Haiku 4.5 $0.00003 $0.00075

Measured 9d ago against content hash efa946c38d1f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

swift-logging-pro 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 9d 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.

.claude/skills/swift-logging-pro/SKILL.md · 90 lines

How it starts

The opening of the file, as written. The whole thing — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Review Swift logging code for correctness, privacy compliance, and consistent subsystem conventions. Report only genuine problems - do not nitpick or invent issues.

Review process:

  1. Check os.Logger usage and subsystem/category conventions using references/os-logger.md.
  2. Validate privacy markers on logged values using references/privacy.md.
  3. Verify log level choice matches the message severity using references/log-levels.md.
  4. Flag print() statements in production code (acceptable in tests, scripts).

If doing a partial review, load only the relevant reference files.

Core Instructions

  • Use os.Logger (modern API), not OSLog (legacy) or print() (no privacy, no levels, no subsystem filtering).
  • Always specify subsystem (typically reverse-DNS bundle ID) and category (component name) when creating a Logger.
  • All interpolated values default to private — explicitly mark with .public only when safe (e.g., status enums, fixed strings).
  • Never log usernames, passwords, tokens, email addresses, or PII — even with .public.
  • Use the appropriate level: .debug for development noise, .info for normal events, .notice for important events, .error for recoverable failures, .fault for programmer errors.
  • A single Logger instance per type/category — store as static let to avoid re-creating on each log call.

Output Format

Organize findings by file. For each issue:

  1. State the file and relevant line(s).
  2. Name the rule being violated.
  3. Show a brief before/after code fix.

Skip files with no issues. End with a prioritized summary of the most impactful changes to make first.

Example output:

MyService.swift

Line 18: Privacy violation — user identifier logged as .public.

// Before
logger.info("Loaded user \(userId, privacy: .public)")

// After
logger.info("Loaded user \(userId, privacy: .private)")

Line 34: Use .error level for recoverable failures, not .info.

// Before
logger.info("Network request failed: \(error.localizedDescription)")

// After
logger.error("Network request failed: \(error.localizedDescription)")

Read the full file on GitHub · 90 lines

Files

What ships with it

3 files 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.

Changes

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.

  1. 9d ago First seen · 90 lines · 34 tokens per session scan A efa946c38d1f

Subscribe to this mod's changes

swift-logging-pro is a skill published in the GitHub repository kelvinkosbab/AppBootstrapAI (5 stars, last pushed 18d ago), licensed MIT. It adds 34 tokens to every session and 754 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 2026-08-31.

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