why SKILL.md skillA
why from michael-denyer/pstack-claude is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add michael-denyer/pstack-claude/why@git:20261030.bfaf03ePins git:20261030.bfaf03e in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- michael-denyer/pstack-claude
- Path
plugins/pstack/skills/why/SKILL.md- Versions recorded
- 16
- Latest version
- git:20261030.bfaf03e, committed Oct 30, 2026
- First version recorded
- Aug 27, 2026
- Size
- 10,582 bytes
- Repository stars
- 3,776
- 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 On Codex, read the [platform mapping](../poteto-mode/references/codex-tools.md), including its per-skill notes, before following this skill. On GitHub Copilot, read the [platform mapping](../poteto-mode/references/copilot-tools.md), including its per-skill notes, before following this skill. On Muse, read the [platform mapping](../poteto-mode/references/muse-tools.md), including its per-skill notes, before following this skill. Investigate the motivation and intent behind code. The companion `how` skill answers what the code does and how it works. `why` answers what forces led to its shape. Each spawn below names a role line in `pstack-models.md` and a default in [Models](#models). Set `model` to that line's value, or to the default if the sheet or the line is missing. Leave `model` unset when the value is `auto` or `inherit-parent`. If the `Agent` tool rejects a slug, use the default and say so. If it rejects the default, use the closest valid slug of the same family from its error message. Pick each subagent's reasoning level for the job, per the Subagents section of the **poteto-mode** skill. …
Read the whole file at its exact version.
How to install
mdr add michael-denyer/pstack-claude/why@sha256:b931c1413d6c727dThe line at the top of this page pins the label git:20261030.bfaf03e, 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_6cpwwqdepd3hqn4s)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 16 versions of this file, between Aug 27, 2026 and Oct 30, 2026, about one every 4 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261030.bfaf03e latest | 2026-10-30 | bfaf03e | 10,582 B | A | view · diff |
| git:20261020.d56fdb0 | 2026-10-20 | d56fdb0 | 10,538 B | A | view · diff |
| git:20261020.88f6d39 | 2026-10-20 | 88f6d39 | 10,298 B | A | view · diff |
| git:20261015.1dba27e | 2026-10-15 | 1dba27e | 10,547 B | A | view · diff |
| git:20261013.058a348 | 2026-10-13 | 058a348 | 10,441 B | A | view · diff |
| git:20261005.8d3aa57 | 2026-10-05 | 8d3aa57 | 12,034 B | A | view · diff |
| git:20260925.c02fd49 | 2026-09-25 | c02fd49 | 11,881 B | A | view · diff |
| git:20260925.9f3a2ca | 2026-09-25 | 9f3a2ca | 11,845 B | A | view · diff |
| git:20260923.1924a06 | 2026-09-23 | 1924a06 | 10,837 B | A | view · diff |
| git:20260923.4a3ef20 | 2026-09-23 | 4a3ef20 | 10,859 B | A | view · diff |
| git:20260922.55853d9 | 2026-09-22 | 55853d9 | 10,463 B | A | view · diff |
| git:20260907.ebb8c27 | 2026-09-07 | ebb8c27 | 10,459 B | A | view · diff |
| git:20260907.3df207b | 2026-09-07 | 3df207b | 21,836 B | A | view · diff |
| git:20260907.09f3a50 | 2026-09-07 | 09f3a50 | 21,694 B | A | view · diff |
| git:20260901.f8c37b8 | 2026-09-01 | f8c37b8 | 21,972 B | A | view · diff |
| git:20260827.c2ade4b | 2026-08-27 | c2ade4b | 22,002 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 (10582 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
michael-denyer/pstack-claude · 3,776 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_6cpwwqdepd3hqn4s GET https://markdownregistry.com/api/v1/resolve?ref=michael-denyer/pstack-claude/why GET https://markdownregistry.com/api/v1/blob/b931c1413d6c727de907051986df09bc2a86d8ceb8c0a5bd68954341d73c5289
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.
More from michael-denyer/pstack-claude
Every file in michael-denyer/pstack-claude