dotnet-logger-message-design SKILL.md skillA
dotnet-logger-message-design from arasz/ai-badger is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add arasz/ai-badger/dotnet-logger-message-design@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- arasz/ai-badger
- Path
features/dotnet/skills/dotnet-workload/references/dotnet-logger-message-design/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0.0, committed Aug 24, 2026
- Size
- 6,340 bytes
- Repository stars
- 3
- License
- MIT
Use when designing or testing [LoggerMessage] log lines in .NET: nested static partial Log classes, explicit EventIds with per-category ranges, no call-site interpolation, collection parameters (pre-join at the call site), per-item detail logs vs counts, and FakeLogger-based log assertions (generic vs non-generic compile contract, LatestRecord/AllRecords, RED-first EventId tests).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# dotnet-logger-message-design
Design and test `[LoggerMessage]` logging that stays inside the high-performance invariant (nested static partial `Log`, explicit EventIds, no string interpolation at call sites) while actually delivering what the help text/docs promise.
## Trigger
- Adding a new log line to a service that uses the nested `Log` class pattern.
- A finding like "feature promises to log X but logs only counts" — designing the detail-logging fix.
- Writing tests that assert log records (EventId, level, message contents).
## Design rules
1. **`[LoggerMessage]` templates cannot format collections.** An `IReadOnlyList<string>` parameter renders as its type name. Pre-join at the call site: `string.Join(", ", reasons)` — that is a parameter build, NOT interpolation, so it satisfies the no-interpolation invariant. One small allocation, fine off the hot path.
2. **EventIds**: allocate from the class's next free id in its own range (event ids are scoped per logger category — cross-class reuse is benign, same-category collisions are not). One EventId per (message shape, level) pair; if the same shape is logged at two levels, write two `[LoggerMessage]` methods.
…Read the whole file at its exact version.
How to install
mdr add arasz/ai-badger/dotnet-logger-message-design@sha256:05bc5e9ef16cbb9bThe line at the top of this page pins the label v1.0.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_sn65pyan5w4ugazn)
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Versions
The registry has recorded 1 version of this file, committed on Aug 24, 2026.
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Source
arasz/ai-badger · 3 stars · license MIT · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_sn65pyan5w4ugazn GET https://markdownregistry.com/api/v1/resolve?ref=arasz/ai-badger/dotnet-logger-message-design GET https://markdownregistry.com/api/v1/blob/05bc5e9ef16cbb9b4d560a23c3cd94ca72480d0804b14f89d7828958e2556291
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