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Generates structured logging infrastructure using os.log/Logger to replace print() statements.
Passed 20 of 22 test cases with the skill, and 15 of 22 without it.
and 2 more in the full report
5 fixed15 passed either way2 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 5 test cases the skill fixed. Same model, same prompt, with and without the skill.
When setting up structured logging categories for a standard Swift application, what four default functional categories should be included?
| Checked | Without skill | With skill |
|---|---|---|
| Includes Network, Auth, UI, and Data as default logging categories. | Missed | Passed |
The instructions your model reads when the skill loads.
Replace print() statements with Apple's structured logging system (os.log/Logger) for better debugging, privacy controls, and Console.app integration.
Use this skill when the user:
| print() | Logger |
|---|---|
| Always executes | Debug logs compiled out in Release |
| No filtering | Filter by subsystem/category in Console.app |
| No privacy | .private, .public, .sensitive annotations |
| String interpolation always runs | Deferred evaluation (performance) |
| Not in Console.app | Full system integration |
Search for existing logging:
Glob: **/*Logger*.swift
Grep: "import OSLog" or "os_log"
If found, ask user:
test cases passed, vs 15 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.