crux SKILL.md skillA
crux 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@v4.0Pins v4.0 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/SKILL.md- Versions recorded
- 12
- Latest version
- v4.0, committed Oct 31, 2026
- First version recorded
- Aug 31, 2026
- Size
- 7,863 bytes
- Repository stars
- 17
- License
- MIT
The always-on core of crux, a research notebook that fills itself: a tree of questions, hypotheses and findings, with evidence and confidence, recorded silently from the conversation. Injected at session start in a repo with a vault. Use for research talk in a crux repo, or when the PI wants to start one. Triggers: crux, lab notebook, research notebook, open a research question, hypothesis tracking, what did we find.
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 — the always-on core The vault is the project's long-term memory, kept by the scientific method: the questions asked, the hypotheses made, what was found, the evidence, and how confident we are. You keep it in the background while you work. The engine (`crux`, `scaffold/crux.py`) does the bookkeeping and derives state; you supply the science. `crux <verb> --help` is the reference. ## Capture Record silently, as the conversation produces each item. Read `crux status --json` first, and before opening an item or proposing a next step its `path` to the top question (`crux brief <id> --mode=situate --json`); never open a second node for something the tree holds. - **Question**: something we want to know. `crux ask "<question>" -p <parent> --bears "<…>"`. - **Hypothesis**: a testable guess at an answer. It states an **expectation** before any evidence: `crux hypothesize "<claim>" -p <qid> --expect "<result, with its size>" --bears "<…>"`. Add `--null` and `-v` checks only when they can be defined. - **Finding**: what a result showed. **Evidence is always recorded**: a number, a plot, a run output becomes `crux finding <id> ... -e <path under results/ or tasks/>`. …
Read the whole file at its exact version.
How to install
mdr add mehdiforoozandeh/crux/crux@sha256:4cadd06188a6a1bcThe line at the top of this page pins the label v4.0, 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_jvghwutlbae3mekx)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 12 versions of this file, between Aug 31, 2026 and Oct 31, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v4.0 latest | 2026-10-31 | 5adc941 | 7,863 B | A | view · diff |
| v4.0 | 2026-10-31 | f2d27f9 | 7,826 B | A | view · diff |
| v4.0 | 2026-10-31 | ecd0353 | 7,265 B | A | view · diff |
| v1.0 | 2026-10-29 | bbe07a2 | 36,401 B | A | view · diff |
| v1.0 | 2026-10-29 | 1ced566 | 36,405 B | A | view · diff |
| v1.0 | 2026-10-25 | f962bcb | 37,844 B | A | view · diff |
| v1.0 | 2026-09-20 | 0b94dad | 37,608 B | A | view · diff |
| v1.0 | 2026-09-18 | 1d07431 | 37,446 B | A | view · diff |
| v1.0 | 2026-09-17 | 90dc6bf | 36,736 B | A | view · diff |
| v1.0 | 2026-09-17 | bf6d9d7 | 35,419 B | A | view · diff |
| v1.0 | 2026-09-16 | 5414523 | 34,975 B | A | view · diff |
| v1.0 | 2026-08-31 | ca0e973 | 34,458 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 (7863 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_jvghwutlbae3mekx GET https://markdownregistry.com/api/v1/resolve?ref=mehdiforoozandeh/crux/crux GET https://markdownregistry.com/api/v1/blob/4cadd06188a6a1bca43b2a7d992b4da11edd96759b2d6d0c1929153ee3630604
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.