yarlson/yarstack · plugins/yarstack/skills/system-investigate/SKILL.md

system-investigate skillA

system-investigate is agent-read markdown (skill) from yarlson/yarstack: Investigate an underdefined product, codebase, architecture, integration, or operational question through read-only repository tracing, bounded runtime evidence, and current public research. Use when the user wants to validate suspected behavior, explain why it occurs, compare plausible designs for existing behavior, or recommend the smallest safe change before planning or implementation; not for designing a new system or feature, which belongs to system-design..

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 yarlson/yarstack/system-investigate@git:20260903.c5d000e
Exact content
mdr add yarlson/yarstack/system-investigate@sha256:31008056e526ef9b

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_wa62bm37wfqnejkl.svg)](https://markdownregistry.com/a/art_wa62bm37wfqnejkl)

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Versions

versioncommittedcommitsizeaudit
git:20260903.c5d000e latest2026-09-03 c5d000e 8,196 BA view · diff
git:20260903.27a87ef2026-09-03 27a87ef 7,737 BA view · diff
git:20260806.527073b2026-08-06 527073b 7,462 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 (8196 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

yarlson/yarstack · 3 stars · license MIT · pushed 2026-09-12 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_wa62bm37wfqnejkl
GET https://markdownregistry.com/api/v1/resolve?ref=yarlson/yarstack/system-investigate
GET https://markdownregistry.com/api/v1/blob/31008056e526ef9b055da6dac117cd4af48416bb0c9d45b336b0b3943b20d7eb

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