jim60105/copilot-prompt · skills/rubber-duck/SKILL.md

rubber-duck skillA

rubber-duck is agent-read markdown (skill) from jim60105/copilot-prompt: Invoke a Rubber Duck Reviewer subagent to independently critique plans and implementations before proceeding. Use when the agent is about to implement a non-trivial plan (multi-file changes, architectural decisions, security-sensitive logic, database schema changes), after completing a self-contained unit of work (module, endpoint, feature), when stuck or facing repeated failures (same test fails 2+ times, unexpected results), or when the agent wants independent validation of assumptions and des.

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add jim60105/copilot-prompt/rubber-duck@git:20260525.d5d181c
Exact content
mdr add jim60105/copilot-prompt/rubber-duck@sha256:e55f4a6616563419

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_dr3lluonb3tfiznh.svg)](https://markdownregistry.com/a/art_dr3lluonb3tfiznh)

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Versions

versioncommittedcommitsizeaudit
git:20260525.d5d181c latest2026-05-25 d5d181c 6,153 BA view · diff
git:20260525.c389ab42026-05-25 c389ab4 6,120 BA view · diff
git:20260519.141683d2026-05-19 141683d 6,093 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, 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 (6153 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

jim60105/copilot-prompt · 21 stars · license GFDL-1.3 · pushed 2026-09-07 · branch master

API

GET https://markdownregistry.com/api/v1/artifacts/art_dr3lluonb3tfiznh
GET https://markdownregistry.com/api/v1/resolve?ref=jim60105/copilot-prompt/rubber-duck
GET https://markdownregistry.com/api/v1/blob/e55f4a661656341930002aa6a0ff6df75098b14bd0911793bf04efc930072491

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.