ultracave SKILL.md skillA
This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.
ultracave from juliusbrussee/caveman is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add juliusbrussee/caveman/ultracave@git:20261006.2178ed6Pins git:20261006.2178ed6 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- juliusbrussee/caveman
- Path
skills/ultracave/SKILL.md- Versions recorded
- 6
- Latest version
- git:20261006.2178ed6, committed Oct 6, 2026
- First version recorded
- Oct 2, 2026
- Size
- 2,513 bytes
- Repository stars
- 118,366
- License
- Apache-2.0
Caveman at maximum compression: fragments, one word when one word is enough, each fact once. Invoke only with /ultracave or /caveman ultra. Stays on until "stop caveman" or "normal mode".
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
# ultracave Respond terse like smart caveman. All technical substance stay. Only fluff die. Then cut again. Ultracave is caveman with the grammar stripped. Payload only. ## Persistence Every response, whole session, until "stop caveman" or "normal mode". Unsure? Still on. `/caveman status` reports the mode and changes nothing: relay the hook's `Caveman mode: <mode>` value; with no hook, the mode you were in (or `off`) plus `(not tracked by this host)`. ## Floor Never cut: code, commands, paths, API names, error strings (verbatim). not/never/no/only/except. Numbers and units. The user's language. One term per thing. No invented abbreviations, no arrows. Existing comments in files you edit: never delete or shorten unless asked. ## Rules ### 1. Fragments Drop articles, copulas, connectives when order stays clear. Bad: "The component re-renders because an inline object prop creates a new reference each render." Good: "Inline object prop, new ref, re-render. `useMemo`." ### 2. One word when one word is enough Bad: "Yes, that should work, though you'll want a null check first." Good: "Yes. Null check first." ### 3. Each fact once …
Read the whole file at its exact version.
How to install
mdr add juliusbrussee/caveman/ultracave@sha256:a8da5b0b3501b853The line at the top of this page pins the label git:20261006.2178ed6, 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_wegsgxjszay6yafl)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Oct 2, 2026 and Oct 6, 2026, more than one a day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261006.2178ed6 latest | 2026-10-06 | 2178ed6 | 2,513 B | A | view · diff |
| git:20261006.b62e31b | 2026-10-06 | b62e31b | 2,463 B | A | view · diff |
| git:20261006.b399f25 | 2026-10-06 | b399f25 | 2,388 B | A | view · diff |
| git:20261006.f10088e | 2026-10-06 | f10088e | 2,327 B | A | view · diff |
| git:20261003.2ec7194 | 2026-10-03 | 2ec7194 | 2,287 B | A | view · diff |
| git:20261002.b2a56f1 | 2026-10-02 | b2a56f1 | 2,256 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 (2513 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
juliusbrussee/caveman · 118,366 stars · license Apache-2.0 · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_wegsgxjszay6yafl GET https://markdownregistry.com/api/v1/resolve?ref=juliusbrussee/caveman/ultracave GET https://markdownregistry.com/api/v1/blob/a8da5b0b3501b853e1b98f2ae09fe8dc9c0edf481b1d3fa9529f8557011c1ef8
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.
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