crux-rd SKILL.md skillA
crux-rd from mehdiforoozandeh/crux is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add mehdiforoozandeh/crux/crux-rd@v1.0Pins v1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- mehdiforoozandeh/crux
- Path
skills/crux-rd/SKILL.md- Versions recorded
- 2
- Latest version
- v1.0, committed Oct 31, 2026
- First version recorded
- Aug 16, 2026
- Size
- 7,036 bytes
- Repository stars
- 17
- License
- MIT
Write the Requirements Document for a crux node — the design detail that does not fit, and should not fit, inside a 400-word question or hypothesis. An RD is one immutable design document per node, living in `rd/` beside the tree, linked from the node, outside the roll-up: the estimand and its bound, the probe ladder, the negative control, the known distortion that must travel with every result. You do not interview and you do not re-derive — you write up the design that has just been settled…
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
# crux-rd — the design document a node cannot hold crux caps a node's prose at **400 words**. That cap exists because nodes measured in the thousands of words stopped being readable by the PI they exist to serve. But a cap with no outlet just makes prose denser. **This is the outlet.** An RD is where design detail goes **to be readable, not to hide.** The node's TL;DR must still stand alone: a reader who never opens the RD still knows what is being asked and what would settle it. If moving text into an RD makes the node unintelligible, the move was wrong. ## When you are invoked **Only when asked.** This skill ships `disable-model-invocation: true` and means it. The design being written up **lives in the conversation that just happened with the PI** — that is the whole reason this is a skill and not an agent. From a cold start you would either restate the node or re-derive the design badly. So: no interview, no research phase, no "shall I write this up?" offered unprompted. When the PI says the design has settled, you synthesize what was already discussed. ## The write-vs-skip filter — apply this *before* writing anything …
Read the whole file at its exact version.
How to install
mdr add mehdiforoozandeh/crux/crux-rd@sha256:8fac08e08f33805bThe line at the top of this page pins the label v1.0, 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_kucx5owka62otbca)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Aug 16, 2026 and Oct 31, 2026, about one every 76 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0 latest | 2026-10-31 | ecd0353 | 7,036 B | A | view · diff |
| v1.0 | 2026-08-16 | c65d4a5 | 7,002 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7036 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
mehdiforoozandeh/crux · 17 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_kucx5owka62otbca GET https://markdownregistry.com/api/v1/resolve?ref=mehdiforoozandeh/crux/crux-rd GET https://markdownregistry.com/api/v1/blob/8fac08e08f33805b3611e6984c347e600f6223ee6c03f0ac0c244102487d62af
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.