ab-equivalence SKILL.md skillA
ab-equivalence from bjcoombs/ai-native-toolkit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add bjcoombs/ai-native-toolkit/ab-equivalence@git:20260625.d42d180Pins git:20260625.d42d180 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- bjcoombs/ai-native-toolkit
- Path
skills/ab-equivalence/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260625.d42d180, committed Jun 25, 2026
- First version recorded
- Jun 3, 2026
- Size
- 12,915 bytes
- Repository stars
- 32
- License
- Apache-2.0
Compare two versions of an LLM-directed document - an original (teacher) and a candidate (student) - across a transfer set and return a per-case behavioural-equivalence verdict plus an efficiency signal. A transform-agnostic library capability other skills compose to gate a transform on behavioural sameness. TRIGGER when asked to A/B test two versions of a prompt / instruction / skill, to check whether a rewritten or compressed document still behaves the same as the original, to validate…
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
# A/B equivalence - a transform-agnostic behavioural-equivalence capability
A thin capability that compares two versions of an LLM-directed document - an `original` (the teacher) and a `candidate` (the student) - across a transfer set, and returns a per-case verdict on whether the candidate still induces the behaviour the original induced.
It is **transform-agnostic**: it judges *behavioural equivalence between two versions* and neither knows nor cares which transform produced the candidate. It therefore serves every optimizer transform that claims to preserve behaviour - compression today, directive-clarity next - not just compression. It is a **library capability** other skills compose: `semantic-compress` invokes it to gate a distillation, and `skill-forge` exposes it alongside its own quality gate. It does **not** judge *absolute quality* ("is this skill good?") - that is a different question answered by different judges. A/B equivalence judges *sameness between two versions* ("does the candidate still do what the original did?").
…Read the whole file at its exact version.
How to install
mdr add bjcoombs/ai-native-toolkit/ab-equivalence@sha256:e7021fc39dd14390The line at the top of this page pins the label git:20260625.d42d180, 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_fods5pdtyjavbxfg)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Jun 3, 2026 and Jun 25, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260625.d42d180 latest | 2026-06-25 | d42d180 | 12,915 B | A | view · diff |
| git:20260624.8709161 | 2026-06-24 | 8709161 | 13,302 B | A | view · diff |
| git:20260618.9c35735 | 2026-06-18 | 9c35735 | 12,515 B | A | view · diff |
| git:20260617.d990bfb | 2026-06-17 | d990bfb | 11,859 B | A | view · diff |
| git:20260603.ad37497 | 2026-06-03 | ad37497 | 11,752 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 (12915 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
bjcoombs/ai-native-toolkit · 32 stars · license Apache-2.0 · pushed 2026-10-16 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_fods5pdtyjavbxfg GET https://markdownregistry.com/api/v1/resolve?ref=bjcoombs/ai-native-toolkit/ab-equivalence GET https://markdownregistry.com/api/v1/blob/e7021fc39dd14390e044160ad4190c8f433fd095b4e84cd437553b75d5302bf8
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.