al-probe SKILL.md skillA
al-probe from sshadows/lethal is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sshadows/lethal/al-probe@git:20261106.09fab17Pins git:20261106.09fab17 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sshadows/lethal
- Path
.claude/skills/al-probe/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261106.09fab17, committed Nov 6, 2026
- First version recorded
- Jul 31, 2026
- Size
- 7,301 bytes
- Repository stars
- 10
- License
- MIT
Scaffold, publish and run a throwaway AL probe app against a LethAL BC container to MEASURE real Business Central behaviour instead of reasoning about it. Use when a claim about what BC actually does is load-bearing — before writing it into a spec, a comment, a roadmap row or a verdict rule. Knows this repo's id ranges, the schema-ghost publish order, and why StartSession is unavailable.
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
# Measure BC, don't reason about it LethAL's AL has **no unit-test harness**. `alc` proves it compiles; nothing proves what BC *does*. When a behavioural claim is about to become load-bearing — a verdict rule, a spec section, a roadmap row — measure it. The generic `bc-measure` skill covers experiment design (controls, disjoint row ranges, cache confounds, reading `SqlStatementsExecuted`). **Read it for the method.** This skill exists because that one does not know LethAL, and three of its landmines cost real time here. ## The three landmines, and how to avoid them ### 1. Id range 91000–91099 is TAKEN `LethAL Control` owns it. A probe scaffolded from the generic template (91000–91010) fails at publish, not at compile: ``` The application object of type 'Table' with the ID '91000' is defined in multiple apps. The apps are: <probe>; LethAL Control by LethAL 1.0.0.x ``` **Use 91500-91599, the range reserved for scratch work.** Set it in `app.json` `idRanges` *and* on every object. **A scratch object in a COPY of a fixture app must be checked free first** (it has to sit in that app's own id range, so 915xx does …
Read the whole file at its exact version.
How to install
mdr add sshadows/lethal/al-probe@sha256:e03c184cbf5e23a7The line at the top of this page pins the label git:20261106.09fab17, 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_gol46nsxcxgnomtk)
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Versions
The registry has recorded 5 versions of this file, between Jul 31, 2026 and Nov 6, 2026, about one every 24 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261106.09fab17 latest | 2026-11-06 | 09fab17 | 7,301 B | A | view · diff |
| git:20261004.4805843 | 2026-10-04 | 4805843 | 6,356 B | A | view · diff |
| git:20261003.c44169c | 2026-10-03 | c44169c | 5,956 B | A | view · diff |
| git:20260820.37e9d7b | 2026-08-20 | 37e9d7b | 5,873 B | A | view · diff |
| git:20260731.57b38ac | 2026-07-31 | 57b38ac | 5,873 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 (7301 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
sshadows/lethal · 10 stars · license MIT · pushed 2026-11-07 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_gol46nsxcxgnomtk GET https://markdownregistry.com/api/v1/resolve?ref=sshadows/lethal/al-probe GET https://markdownregistry.com/api/v1/blob/e03c184cbf5e23a7f70c0d0e2c06e439fb6e8006f2bf18038d1dc4de361c3894
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.