polyvers SKILL.md skillA
polyvers from cognitive-fab/polygraph is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add cognitive-fab/polygraph/polyvers@git:20260718.3df769bPins git:20260718.3df769b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- cognitive-fab/polygraph
- Path
skills/polyvers/SKILL.md- Versions recorded
- 4
- Latest version
- git:20260718.3df769b, committed Jul 18, 2026
- First version recorded
- Jul 18, 2026
- Size
- 7,640 bytes
- Repository stars
- 15
- License
- Apache-2.0
Check whether a state-machine version change is safe to ship against the live fleet, and produce the migration when the shape changed. Classifies the change into compatibility lanes (shape, vocabulary, intent, semantic, migration, composition), runs the mechanical gates those lanes require against fleet snapshots — setState round-trip, cross-version stimuli replay, migration validation, and the seeded model check ("can any live state be driven to an invariant violation under the new rules") —…
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
# polyvers — version a state machine with mechanical gates
The fourth engine: Polygraph audits, polygen authors, polyrun executes,
polyvers EVOLVES. The premise (from
`${CLAUDE_PLUGIN_ROOT}/docs/VERSIONING.md`): state outlives code, so every
deploy is a compatibility event against the live fleet — and "compatible"
is not one question but several, each with its own mechanical check.
Everything here is deterministic, local, and needs **no API key**.
The CLI is `${CLAUDE_PLUGIN_ROOT}/polyvers/bin/polyvers.mjs`; an artifact
dir holds `contract.json` + the SAM v2 module + optional `invariants.mjs`,
`effects.manifest.json`, `effects.cjs`, `migrate.cjs` — what polygen emits.
> **Disclosure (same as the whole plugin).** This is experimental, unproven
> technology, and these gates are consistency checks, not proofs. They are
> exactly as good as the invariants the artifacts state — semantic drift the
> invariants do not mention is invisible to every gate — and every
> "exhaustive" gate is exhaustive over the declared finite (action, data)
> domains, not over unbounded real data. Versioning maturity
> is invariant-writing maturity.
## Step 1 — Classify before running anything
```
…Read the whole file at its exact version.
How to install
mdr add cognitive-fab/polygraph/polyvers@sha256:a62fad4028261e42The line at the top of this page pins the label git:20260718.3df769b, 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_lymotfwyptybhoye)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, all committed on Jul 18, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260718.3df769b latest | 2026-07-18 | 3df769b | 7,640 B | A | view · diff |
| git:20260718.4784279 | 2026-07-18 | 4784279 | 6,601 B | A | view · diff |
| git:20260718.cbbbe5e | 2026-07-18 | cbbbe5e | 6,473 B | A | view · diff |
| git:20260718.f506a5e | 2026-07-18 | f506a5e | 6,144 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 (7640 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
cognitive-fab/polygraph · 15 stars · license Apache-2.0 · pushed 2026-09-13 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_lymotfwyptybhoye GET https://markdownregistry.com/api/v1/resolve?ref=cognitive-fab/polygraph/polyvers GET https://markdownregistry.com/api/v1/blob/a62fad4028261e420752c38c78d1734757925cf2c9a3ca4fdab06c8dccd10536
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.