data-leakage-hunting SKILL.md skillA
data-leakage-hunting from annatchijova/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add annatchijova/skills/data-leakage-hunting@git:20260822.33d806dPins git:20260822.33d806d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- annatchijova/skills
- Path
data-leakage-hunting/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260822.33d806d, committed Aug 22, 2026
- Size
- 10,527 bytes
- Repository stars
- 9
- License
- a license file GitHub does not identify
Hunt the one bug class in machine learning whose symptom is a better score — information from the evaluation set reaching the model through preprocessing, time, groups, duplicates, features derived from the label, or a test set spent on tuning. Use whenever a dataset is split, a pipeline is fitted, a feature is engineered, a benchmark is reported, or a model performs suspiciously well. Trigger on "data leakage", "target leakage", "train/test contamination", "the accuracy is 99%…
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
# Data Leakage Hunting Every other defect makes something fail. This one makes everything look better — which means the normal feedback loop of engineering runs in reverse. A leak is discovered by celebration, adopted into the pipeline, published in the README, and found six months later by production. So the alarm has to be inverted, and it is the first rule of this skill: > **An unexpectedly good result is a bug report until proven otherwise.** The invariant being violated is always the same one, and it is worth writing on the wall: > **No information derived from the evaluation data may influence anything used > to produce the prediction.** Established at the split (T0), it must still hold > at fit time, at feature-construction time, at tuning time, and at the moment > the number goes in the report (Tn). That is `invariant-hunting`'s shape exactly: a property established in one place that has to survive a journey. The difference is that here the violation *rewards* you, so nobody goes looking. Composes with the library: - **invariant-hunting** — the T0→Tn frame; this is its ML instance - **model-evaluation-discipline** — the number the leak corrupts, and the …
Read the whole file at its exact version.
How to install
mdr add annatchijova/skills/data-leakage-hunting@sha256:b85023097923ddb3The line at the top of this page pins the label git:20260822.33d806d, 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_wes6dhy45aufwro3)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 22, 2026.
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 (10527 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
annatchijova/skills · 9 stars · license a license file GitHub does not identify · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_wes6dhy45aufwro3 GET https://markdownregistry.com/api/v1/resolve?ref=annatchijova/skills/data-leakage-hunting GET https://markdownregistry.com/api/v1/blob/b85023097923ddb3f52f089243d3700e78eefa4e86e7dfd87fcf5131657012c2
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.