premortem SKILL.md skillA
premortem from joetawil7/first-pass is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add joetawil7/first-pass/premortem@git:20261009.f5bc413Pins git:20261009.f5bc413 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- joetawil7/first-pass
- Path
skills/premortem/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261009.f5bc413, committed Oct 9, 2026
- First version recorded
- Sep 25, 2026
- Size
- 10,064 bytes
- Repository stars
- 107
- License
- MIT
Run before writing or changing code for any feature, bug fix or refactor that touches data, jobs, money, outside services or user-facing behaviour. Finds where the change will break before it is built, by walking ten named failure classes (twice, halfway, outside call, failure-is-not-empty, neighbors, endings, money, hostile user, words, scale and time) against the code, and writes the answers into the plan. Use when planning a change, when asked to "think it through", "cover the gaps…
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
# premortem
Assume the change shipped and broke. Find out where, before writing it.
"Be careful" does nothing: it names no place to look. These ten questions name places. Each
answer is one of three things, and nothing else counts:
- **file:line** showing it is already handled,
- **the test** that will prove it (named now, written with the change), or
- **"Not handled, because ___"**, a reason the owner can accept or reject.
"N/A" is allowed only with the reason: "Twice: N/A, the handler is a pure read".
## Size it to the change
- A copy or style change: one line covering all ten ("Words: checked X; rest N/A, no data
or behaviour change").
- A normal feature: a line or two per question.
- Money, publishing, deletion, auth, background jobs, anything irreversible: a paragraph per
question, and read the code for each, don't answer from memory.
## 0. Map what the change touches
First the task's scope (the rules' "Stay in the task's scope"). A change with no logic in it
(a comment, a doc, a spelling fix: no behaviour changes and no label's meaning changes; when
unsure, it is not one) writes one line, `Scope: <the file or text>, no
…Read the whole file at its exact version.
How to install
mdr add joetawil7/first-pass/premortem@sha256:9f52f07ef90a62a6The line at the top of this page pins the label git:20261009.f5bc413, 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_jys3dxzgwwvtcvde)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Sep 25, 2026 and Oct 9, 2026, about one every 3 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261009.f5bc413 latest | 2026-10-09 | f5bc413 | 10,064 B | A | view · diff |
| git:20261001.a4388fa | 2026-10-01 | a4388fa | 10,028 B | A | view · diff |
| git:20260930.6d0683a | 2026-09-30 | 6d0683a | 7,539 B | A | view · diff |
| git:20260925.b12fce8 | 2026-09-25 | b12fce8 | 7,423 B | A | view · diff |
| git:20260925.dbcac0d | 2026-09-25 | dbcac0d | 6,938 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 (10064 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
joetawil7/first-pass · 107 stars · license MIT · pushed 2026-10-17 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jys3dxzgwwvtcvde GET https://markdownregistry.com/api/v1/resolve?ref=joetawil7/first-pass/premortem GET https://markdownregistry.com/api/v1/blob/9f52f07ef90a62a6aa8a0ddbb83f3527ed466a6081073a11a5986063d57b14f9
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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