Use when a design decision is made that is expensive to reverse, affects multiple components, or rejects a plausible alternative — record it as an Architecture Decision Record under docs/hydraia/adr/. Also use to supersede an old decision. Not for trivial choices.
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
# ADR — Architecture Decision Records (MADR-lite)
One file per decision: `docs/hydraia/adr/NNNN-<slug>.md`, zero-padded, monotonic (`0001-...`, `0002-...`). Find the next number with `ls docs/hydraia/adr/ | sort | tail -1`.
## When to write one (all it takes is ONE of these)
- Expensive to reverse (data store, auth model, hosting, framework).
- Affects multiple components or teams.
- A plausible alternative was seriously considered and rejected.
When NONE hold → no ADR. ADR spam buries the decisions that matter.
## Template
# NNNN — <decision title>
**Status:** proposed | accepted | superseded by NNNN
**Date:** YYYY-MM-DD
## Context
<the forces: requirements, constraints, and any assumption made because
the human could not answer — stated as an assumption with its revisit
trigger>
## Decision
<what was decided, in one or two sentences, active voice>
## Alternatives considered
- <alternative> — rejected because <reason>
## Consequences
- Good: <what this buys>
- Bad: <what this costs — every decision costs something; empty is a smell>
## Lifecycle rules
…
The line at the top of this page pins the label git:20260703.c5a2b92, 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.
A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (1747 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag
Source
GitHub
jdanigo/hydraia · 8 stars · license MIT · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_6cfifvvhsjmgtif2
GET https://markdownregistry.com/api/v1/resolve?ref=jdanigo/hydraia/adr
GET https://markdownregistry.com/api/v1/blob/2698dff50067f4d3cb1e99e3917df9bb6c4919ba1671e5596b25b95e726fb2fe
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