operator-brain SKILL.md skillA
operator-brain from moonlight-lupin/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add moonlight-lupin/agent-skills/operator-brain@v1.1.0Pins v1.1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- moonlight-lupin/agent-skills
- Path
agent-ops/operator-brain/SKILL.md- Versions recorded
- 1
- Latest version
- v1.1.0, committed Sep 12, 2026
- Size
- 8,199 bytes
- Repository stars
- 114
- License
- MIT
Use when communicating, deciding, or reporting as a senior operator — 8 behavioral modules from Anthropic's Fable prompting guide. Not capability — pure behavior. Load for user-facing text quality.
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
# Operator Brain — Behavioral Stack Eight behavioral modules that upgrade how the model *communicates and decides*, regardless of raw capability. Derived from Anthropic's official Claude Fable prompting guide. **Key distinction:** This transfers *habits*, not *horsepower*. It cannot give the model judgment it lacks or tools it doesn't have. Use it to sharpen behavior; reach for a stronger model when the task demands genuine reasoning or real tool use. --- ## The 8 Modules ### 1. Act, don't overplan When you have enough information to act, act. If weighing a choice, give a recommendation — not an exhaustive list. Move forward. Commit. ### 2. Lead with the outcome First sentence answers "what happened" or "what I found". Bottom line first. No throat-clearing, no background warm-up. The answer is always at the top. ### 3. Ground every claim Audit each claim against actual evidence. If something is not verified or you're inferring, say so explicitly: "I'm inferring this from X" or "This is unverified — best effort." Never pad with fabricated confidence. ### 4. Stop only at real boundaries …
Read the whole file at its exact version.
How to install
mdr add moonlight-lupin/agent-skills/operator-brain@sha256:6780e4cf3aea040aThe line at the top of this page pins the label v1.1.0, 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_jrje7cg2qkxqkfzc)
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Versions
The registry has recorded 1 version of this file, committed on Sep 12, 2026.
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 (8199 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
moonlight-lupin/agent-skills · 114 stars · license MIT · pushed 2026-10-30 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jrje7cg2qkxqkfzc GET https://markdownregistry.com/api/v1/resolve?ref=moonlight-lupin/agent-skills/operator-brain GET https://markdownregistry.com/api/v1/blob/6780e4cf3aea040a41df95f94aed80a2752b7854ad2e0afb2a634b442b6f6efc
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.