ln-771-logging-configurator

Type: L3 Worker Category: 7XX Project Bootstrap Parent: ln-770-crosscutting-setup

Configures structured JSON logging for .NET and Python projects.

Overview

Phase 1: Receive Context

Accept Context Store from coordinator.

Required Context:

• •STACK: .NET or Python
• •FRAMEWORK: ASP.NET Core or FastAPI
• •FRAMEWORK_VERSION: Version number
• •PROJECT_ROOT: Project directory path
• •ENVIRONMENT: Development or Production

Validation:

• •If STACK not provided, detect from project files
• •If version not provided, use latest stable

Phase 2: Research Current Best Practices

Use MCP tools to get up-to-date documentation.

For .NET (Serilog):

MCP ref: "Serilog ASP.NET Core structured logging configuration"
Context7: /serilog/serilog-aspnetcore

For Python (structlog):

MCP ref: "structlog Python structured logging configuration"
Context7: /hynek/structlog

Key Patterns to Research:

1. •Request logging middleware
2. •Log enrichment (correlation ID, user context)
3. •Log level configuration by environment
4. •Sink configuration (Console, File, Seq, Elastic)

Phase 3: Decision Points

Ask user for configuration preferences.

Q1: Log Format

Q2: Enrichment Fields

Q3: Log Sinks

Q4: Log Levels by Environment

Phase 4: Generate Configuration

Generate files based on stack and decisions.

.NET Output Files

Generation Process:

1. •Use MCP ref to get current Serilog API
2. •Generate LoggingExtensions.cs with:
   • •UseSerilog configuration
   • •Request logging middleware
   • •Enrichment configuration
3. •Update appsettings.json with Serilog section

Packages to Add:

• •Serilog.AspNetCore
• •Serilog.Sinks.Console
• •Serilog.Sinks.File (if File sink selected)
• •Serilog.Enrichers.Environment (if machineName selected)

Python Output Files

Generation Process:

1. •Use MCP ref to get current structlog API
2. •Generate logging_config.py with:
   • •Processor chain configuration
   • •Renderer selection (JSON/Console)
   • •Log level configuration
3. •Generate logging_middleware.py for FastAPI

Packages to Add:

• •structlog
• •python-json-logger (if JSON format)

Phase 5: Validate

Verify the configuration works.

Validation Steps:

1. •

   Check imports: Ensure all packages are available

   • •.NET: dotnet list package | grep Serilog
   • •Python: pip list | grep structlog
2. •

   Syntax check:

   • •.NET: dotnet build --no-restore
   • •Python: python -m py_compile core/logging_config.py
3. •

   Test log output:

   • •Start application
   • •Make test request
   • •Verify log format matches configuration

Expected Log Format:

{
  "timestamp": "2026-01-10T12:00:00.000Z",
  "level": "info",
  "message": "Request completed",
  "correlationId": "abc-123",
  "requestPath": "/api/health",
  "responseTime": 45,
  "statusCode": 200
}

Return to Coordinator

Return result to ln-770:

{
  "status": "success",
  "files_created": [
    "Extensions/LoggingExtensions.cs",
    "appsettings.json"
  ],
  "packages_added": [
    "Serilog.AspNetCore",
    "Serilog.Sinks.Console"
  ],
  "registration_code": "services.AddLoggingServices(configuration);",
  "message": "Configured structured logging with Serilog"
}

Idempotency

This skill is idempotent:

• •Phase 1: Check if logging already configured (Grep for Serilog/structlog)
• •If configured: Return { "status": "skipped", "message": "Logging already configured" }
• •If not: Proceed with configuration

Reference Links

• •Serilog.AspNetCore
• •structlog Documentation
• •ASP.NET Core Logging

Version: 2.0.0 Last Updated: 2026-01-10