why SKILL.md skillA
why from lucasheriques/pstack is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add lucasheriques/pstack/why@git:20261014.8882c71Pins git:20261014.8882c71 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- lucasheriques/pstack
- Path
skills/why/SKILL.md- Versions recorded
- 3
- Latest version
- git:20261014.8882c71, committed Oct 14, 2026
- First version recorded
- Sep 23, 2026
- Size
- 8,778 bytes
- Repository stars
- 3
- License
- MIT
Use for 'why does X work this way', 'why we picked Y', design rationale, regressions, postmortems, or data-backed thresholds. Discovers available MCPs and queries each evidence category (source control, issue tracker, long-form docs, real-time chat, infrastructure observability, error tracking, product analytics warehouse) in parallel, then returns a cited read on decisions and tradeoffs. Use how for runtime behavior.
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
# Why
Investigate the motivation and intent behind code. The companion **how** skill (`${CLAUDE_SKILL_DIR}/../how/SKILL.md`) answers what the code does and how it works. `why` answers what forces led to its shape.
Every spawn uses the Agent tool with `subagent_type: "pstack:read-only"`, which keeps MCP access for the investigators and the synthesizer's citation spot-checks and blocks file edits. Models come from `${CLAUDE_SKILL_DIR}/../poteto-mode/references/models.md`.
## Operating Posture
Operate as a **careful, cautious, and precise investigator**. Be honest about what you know vs what you're inferring. Read `${CLAUDE_SKILL_DIR}/references/epistemics.md` for the full confidence framework and phrasing guide. The synthesizer must follow it.
## Step 1. Understand the Target and the Question
The **target** is usually a chunk of code, a pattern, a feature, or a named design decision. The **question** is usually a design rationale, a tradeoff, a motivating edge case, an external constraint, dead code, or a broad history sweep.
…Read the whole file at its exact version.
How to install
mdr add lucasheriques/pstack/why@sha256:e223a1c32b1bb920The line at the top of this page pins the label git:20261014.8882c71, 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_jaiivieqigp7yxx4)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Sep 23, 2026 and Oct 14, 2026, about one every 11 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261014.8882c71 latest | 2026-10-14 | 8882c71 | 8,778 B | A | view · diff |
| git:20260923.11fd787 | 2026-09-23 | 11fd787 | 10,231 B | A | view · diff |
| git:20260923.8a26243 | 2026-09-23 | 8a26243 | 9,989 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 (8778 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
lucasheriques/pstack · 3 stars · license MIT · pushed 2026-10-16 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jaiivieqigp7yxx4 GET https://markdownregistry.com/api/v1/resolve?ref=lucasheriques/pstack/why GET https://markdownregistry.com/api/v1/blob/e223a1c32b1bb92090e6600058bdf889a17322d0e115b48a6359da33a1444f3c
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.
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