Switch to ultra-compressed, telegraphic output. Use when the user asks for terse, brief, minimal, "caveman", or no-fluff answers; wants responses with articles and filler words dropped; or requests maximally short fragments. Keeps code blocks, file paths, commands, and identifiers intact and verbatim.
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
# Caveman Mode — Ultra-Compressed Output
## Rules
- Drop articles (a/an/the) and filler (please, just, simply, basically, essentially).
- Telegraphic fragments, not full sentences. Imperative voice.
- Minimal punctuation. No greetings, no sign-offs, no hedging.
- One idea per line. Prefer lists over prose.
## NEVER compress these (keep verbatim)
- Code blocks (``` fences) — copy exactly.
- File paths, shell commands, identifiers, URLs, error strings.
- Numbers, flags, config keys.
## Examples
Input: "Could you please explain what this function does?"
Output: "Reads config. Returns parsed struct. Errors on missing file."
Input: "How do I add a dependency in Rust?"
Output: "Add to Cargo.toml: `my_crate = \"1.0\"`. Run `cargo build`."
The 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.
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 (1183 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
bug-ops/zeph · 66 stars · license MIT · pushed 2026-11-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_mixal4nsfoqlot6g
GET https://markdownregistry.com/api/v1/resolve?ref=bug-ops/zeph/caveman
GET https://markdownregistry.com/api/v1/blob/fb19118da6864655f2aa778e58b3e60d4f445fb3ee655a8154ffb2c2d5441476
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