Use this skill when you need to record an architecture decision (ADR) or document the reasoning behind a design choice — when changing public APIs, shipping features that change behavior, or recording context that future engineers (human or agent) will need to understand the codebase. Does NOT replace code comments or inline docstrings; targets strategic documentation and decision capture. Primary keywords: ADR architecture decision record, technical documentation, design rationale, decision…
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
# Documentation and ADRs
Records decisions and documents the *why* — context, constraints, trade-offs, and rejected alternatives that code alone cannot express.
---
## Overview
Code tells you *what* was built. Documentation tells you *why* it was built that way, *what alternatives were rejected*, and *what constraints governed the decision*. The most valuable documentation captures the reasoning, not the mechanics.
This skill covers four documentation layers, from most to least strategic:
| Layer | What | When | Effort |
|-------|------|------|--------|
| **🏛️ ADRs** | Architecture Decision Records — capture *why* a decision was made | Every significant architectural choice | 10-30 min |
| **📘 README** | Project entry point — what, why, how | New projects, major releases | 15-60 min |
| **🔌 API Docs** | Endpoint/schema documentation | Every public API change | Per-endpoint |
| **📝 Inline Docs** | Comments explaining *why*, not *what* | Continuously | Seconds |
**Core principle: document decisions, not mechanics.** A comment explaining *why* a rate limit uses a sliding window is valuable. A comment that says `// Increment counter by 1` above `counter += 1` is noise.
---
…
The 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.
GET https://markdownregistry.com/api/v1/artifacts/art_nkdjcwm24i3ifflz
GET https://markdownregistry.com/api/v1/resolve?ref=jpeetz/agent-skills/documentation-and-adrs
GET https://markdownregistry.com/api/v1/blob/dfea4a4c21ff1292483e68b1131c6095edcdfdc0297c22d7264f16b1c9f5aab8
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