kotlin-timber-logger

Development

Add Timber logging statements to Kotlin Android files. Analyzes code logic to insert debug, info, warning, and error logs at function entry/exit, conditionals, try-catch blocks, and state changes. Only accepts Kotlin files (.kt). Use via /timber command.

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/data/kotlin-timber-logger/SKILL.md

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Kotlin Timber Logger

Add intelligent Timber logging to Kotlin Android files based on code analysis.

Activation

Trigger via /timber <file.kt> slash command.

Input Validation

STRICT: Only .kt files accepted

Reject non-Kotlin files immediately
Verify file exists before processing

Log Levels

Level	Method	Use Case
Debug	`Timber.d()`	Function flow, state changes
Info	`Timber.i()`	Important milestones
Warning	`Timber.w()`	Potential issues
Error	`Timber.e()`	Caught exceptions

Logging Strategy

Function Entry/Exit

fun processData(input: String): Result {
    Timber.d("processData() input.length=${input.length}")
    // ... logic ...
    Timber.d("processData() completed")
    return result
}

Suspend Functions

suspend fun fetchData(): Data {
    Timber.d("fetchData() started")
    // ... async logic ...
    Timber.d("fetchData() completed")
    return data
}

Conditionals (when/if)

when (state) {
    State.LOADING -> Timber.d("State: LOADING")
    State.SUCCESS -> Timber.d("State: SUCCESS, items=${data.size}")
    State.ERROR -> Timber.w("State: ERROR, msg=${error.message}")
}

Try-Catch

try {
    val result = parseJson(json)
    Timber.d("JSON parsed successfully")
} catch (e: Exception) {
    Timber.e(e, "JSON parsing failed")
}

StateFlow Updates

_uiState.update { current ->
    Timber.d("State update: loading=${current.loading} -> true")
    current.copy(loading = true)
}

Safety Rules

NEVER log:

Passwords, tokens, API keys
PII (personal identifiable information)
Full large objects (use .size or .take(3))

Avoid:

Logs inside tight loops (throttle or count only)
High-frequency callbacks

Process

Validate input is .kt file
Read file, check for import timber.log.Timber
Identify patterns: functions, try-catch, conditionals, state changes
Add import if missing
Insert appropriate log statements
Report changes made

Output Format

Timber Logging Added: [filename.kt]

Added [N] logs:
- [X] Timber.d() debug
- [X] Timber.w() warning
- [X] Timber.e() error

Instrumented:
- functionName() - entry/exit
- handleError() - try-catch
- when block - state transitions

Import added: Yes/No