pjt222/agent-almanac · i18n/caveman-lite/skills/identify-gemstone/SKILL.md

identify-gemstone skillA

identify-gemstone is agent-read markdown (skill) from pjt222/agent-almanac: Identify gemstones using optical properties, physical tests, and inclusion analysis. Covers refractive index, specific gravity, pleochroism, spectroscopy indicators, and common simulant detection. Use when identifying an unknown gemstone, verifying a seller's claim about species identity, distinguishing natural stones from simulants or synthetics, building gemological literacy through structured observation, or identifying rough material before cutting to ensure safe handling..

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 pjt222/agent-almanac/identify-gemstone@v1.0
Exact content
mdr add pjt222/agent-almanac/identify-gemstone@sha256:d5862047823e7775

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_fiiu2iyz6cp6asmy.svg)](https://markdownregistry.com/a/art_fiiu2iyz6cp6asmy)

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Versions

versioncommittedcommitsizeaudit
v1.0 latest2026-08-17 a784899 16,833 BA view · diff
v1.02026-06-05 33b561c 16,804 BA view · diff
v1.02026-04-24 b4968e1 16,788 BA view · diff
v1.02026-04-19 e334ebd 16,842 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 (16833 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

pjt222/agent-almanac · 33 stars · license MIT · pushed 2026-09-16 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_fiiu2iyz6cp6asmy
GET https://markdownregistry.com/api/v1/resolve?ref=pjt222/agent-almanac/identify-gemstone
GET https://markdownregistry.com/api/v1/blob/d5862047823e77750471e916553493df4a3c6945ad4f5599b0f9f33b46832651

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