harnessprotocol/harness-kit · plugins/rubber-ducky/skills/rubber-ducky/SKILL.md

rubber-ducky skillA

rubber-ducky is agent-read markdown (skill) from harnessprotocol/harness-kit: Use when you've planned a non-trivial change and are about to implement it, finished a complex or multi-file piece of work, just wrote tests, or are stuck on repeated failures — and any time the user says "rubber duck this", "rubber ducky", "get a second opinion", "sanity-check my plan", "poke holes in this", "what am I missing", "critique my approach", "review this before I build it", or "/rubber-ducky". Spawns independent read-only critics on DIFFERENT Claude models than the one driving the se.

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 harnessprotocol/harness-kit/rubber-ducky@git:20260605.3e8524e
Exact content
mdr add harnessprotocol/harness-kit/rubber-ducky@sha256:d702a89035bc6880

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_rw46pnt6ubuyreaj.svg)](https://markdownregistry.com/a/art_rw46pnt6ubuyreaj)

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Versions

versioncommittedcommitsizeaudit
git:20260605.3e8524e latest2026-06-05 3e8524e 9,083 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 (9083 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

harnessprotocol/harness-kit · 10 stars · license Apache-2.0 · pushed 2026-09-18 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_rw46pnt6ubuyreaj
GET https://markdownregistry.com/api/v1/resolve?ref=harnessprotocol/harness-kit/rubber-ducky
GET https://markdownregistry.com/api/v1/blob/d702a89035bc6880215d2c0e779a0920bf1ed9a4ff61400fd7e6b943a3d153d3

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