logging

Logging Scope

$ARGUMENTS

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Add, fix, or update logging following strict principles.

Core Principle: Signal over Noise

Logs that don't get read are useless. Every log statement must earn its place.

Before adding a log, ask:

• Will someone look at this?
• Does this help diagnose something?
• Is this the right level?
• Is there already a log covering this?

Cut ruthlessly. Then cut more.

Log Levels

1. INFO: The Service Narrative

What the service is doing at a glance.

Log these:

• Service startup/shutdown
• External connections established/closed (WebSocket, DB)
• Subscriptions to new resources
• Periodic heartbeats (every N seconds: "processing X markets")
• HTTP requests going out (target, method)
• Key state transitions

Never log:

• Every function entry/exit
• Internal data transformations
• Things that happen thousands of times per second

2. DEBUG: Granular Internals

Details for troubleshooting. Off in production unless investigating.

Log these:

• Request/response payloads (redact secrets)
• Internal state changes
• Timing breakdowns
• Configuration values at startup
• Loop iterations when relevant

3. WARN: Rare by Design

Recoverable errors you're explicitly allowing to continue.

Log these:

• Fallback to default config
• Retryable failures that succeeded on retry
• Resource thresholds approached (memory at 80%)
• Deprecated API usage detected

Never log:

• Expected conditions (user not found, validation failed)
• Anything you'd ignore in production

4. ERROR: Every Failure

Log at the handling point. Once.

• Use language/framework hooks to catch all errors automatically
• Include context: what was being attempted, relevant IDs
• Don't log and rethrow—pick one
• Stack traces for unexpected errors

Process

1. Identify scope (file, module, or all)
2. Audit existing logging against these levels
3. Add missing INFO logs for external-facing events
4. Remove noisy/redundant logs
5. Ensure ERRORs are logged at handling points
6. Use framework-provided logging (HTTP interceptors, etc.) where available
7. Remind: run /logging after significant code changes

No Scope Specified?

Review ALL logging against current code. Fix level mismatches. Remove noise. Add missing service narrative. Report what was changed.