system-investigate SKILL.md skillA
system-investigate from yarlson/yarstack is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add yarlson/yarstack/system-investigate@git:20261017.2f2e03bPins git:20261017.2f2e03b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- yarlson/yarstack
- Path
plugins/yarstack/skills/system-investigate/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261017.2f2e03b, committed Oct 17, 2026
- First version recorded
- Aug 6, 2026
- Size
- 8,333 bytes
- Repository stars
- 3
- License
- MIT
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.
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
# System Investigation Own one investigation from the user's question to an evidence-backed verdict and practical next step. Treat the prompt as a hypothesis, repository and runtime evidence as authority, and implementation as out of scope. ## Establish the investigation 1. Extract the question, suspected behavior, affected system, decision it informs, and requested terminal result. 2. Stop and route to `system-design` when the question asks how to build behavior that does not exist yet, such as a greenfield system or a new capability. Investigate only behavior the repository, runtime, or public sources can show. 3. Write one explicit investigation goal and stopping condition. Use a persisted goal when the host supports it; mark it complete only after the evidence answers the question or proves a precise blocker. 4. State the working hypothesis without treating it as fact. Record plausible alternatives that would materially change the conclusion. …
Read the whole file at its exact version.
How to install
mdr add yarlson/yarstack/system-investigate@sha256:72bfb5b7096ca439The line at the top of this page pins the label git:20261017.2f2e03b, 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_wa62bm37wfqnejkl)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Aug 6, 2026 and Oct 17, 2026, about one every 18 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261017.2f2e03b latest | 2026-10-17 | 2f2e03b | 8,333 B | A | view · diff |
| git:20261017.f669441 | 2026-10-17 | f669441 | 8,298 B | A | view · diff |
| git:20260903.c5d000e | 2026-09-03 | c5d000e | 8,196 B | A | view · diff |
| git:20260903.27a87ef | 2026-09-03 | 27a87ef | 7,737 B | A | view · diff |
| git:20260806.527073b | 2026-08-06 | 527073b | 7,462 B | A | view |
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 (8333 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
yarlson/yarstack · 3 stars · license MIT · pushed 2026-11-05 · 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/72bfb5b7096ca439c02b10fb8cc0af454a20f0e7fa2a1752ed81fa68e7d88df2
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.