Individual skill

serilog

Structured logging with Serilog for .NET 10 applications. Covers two-stage bootstrap, appsettings configuration, enrichers, sinks, request logging, destructuring, and Serilog.Expressions. Load this skill when setting up Serilog, configuring log sinks, enrichers, or structured logging, or when the user mentions "Serilog", "structured logging", "log enrichment", "Seq", "LogContext", "UseSerilog", "WriteTo", "message template", "Serilog.Expressions", "request logging", "log sink", "rolling file", or "audit log".

skills/serilog/SKILL.md

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Repository last updated: Nov 4, 2026
License: MIT

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# Serilog

## Core Principles

1. **Two-stage initialization** — Create a bootstrap logger for startup, then replace it with the full logger after DI is ready. This captures startup errors that would otherwise be lost.
2. **`AddSerilog()` over `UseSerilog()`** — Use `builder.Services.AddSerilog()` (the modern API) instead of `builder.Host.UseSerilog()`. It integrates with DI services via `ReadFrom.Services(services)`.
3. **Message templates, not interpolation** — `{PropertyName}` syntax creates structured data that can be queried. String interpolation (`$"..."`) breaks structure and allocates even when the log level is disabled.
4. **Configure via appsettings.json** — Keep log levels, sinks, and overrides in configuration so they can change per environment without redeployment.

## Patterns

### Two-Stage Bootstrap Setup

```csharp