maintain SKILL.md skillA
maintain from exmergo/dex is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add exmergo/dex/maintain@git:20261019.afd1dcfPins git:20261019.afd1dcf in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- exmergo/dex
- Path
skills/maintain/SKILL.md- Versions recorded
- 21
- Latest version
- git:20261019.afd1dcf, committed Oct 19, 2026
- First version recorded
- Sep 1, 2026
- Size
- 14,117 bytes
- Repository stars
- 88
- License
- Apache-2.0
Use this to find out whether an existing dbt project or semantic layer (dbt, Ossie or SLayer) is correct against its warehouse, and if not, why. `maintain verify` checks the project as it stands; against a .dex/ snapshot, `maintain check` finds schema, volume, grain, and semantic drift and `maintain reconcile` proposes the fix. Reach for it whenever an existing project is suspected wrong, whether or not anything is known to have changed: "this model is wrong, work out why…
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
# Maintain Keep the repository correct as the world underneath it moves, on both of its axes: the dbt project and the semantic layer. Drift is measured against a **baseline**, the `.dex/snapshot.json` fingerprint of the warehouse map and of each project layer. Detection is read-only; only `reconcile` proposes edits, and `transform apply` is the one door that writes them. <!-- dex:procedure:begin --> ## Procedure dex works in one loop: explore, transform, maintain. Every step runs one engine command, reads the single JSON envelope it prints, and decides the next step from that envelope. 1. **Explore before you write.** Before writing or fixing SQL against a table whose columns, types, grain, or join keys you have not verified in this session, run `explore map` (or `explore profile <tables>` for a few named ones) and read its grain, keys, PII flags, and data-quality findings. Answer ad-hoc questions with `explore query`, never with a raw database client. 2. **Plan the change.** Author the file content and hand it to `transform plan` (or `semantic define|update|plan` for the semantic layer). Nothing is written …
Read the whole file at its exact version.
How to install
mdr add exmergo/dex/maintain@sha256:a9d21172ce6dc6bcThe line at the top of this page pins the label git:20261019.afd1dcf, 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_dgkxwweynivpepp3)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 21 versions of this file, between Sep 1, 2026 and Oct 19, 2026, about one every 2 days. Its first recorded version is graded B and its latest A.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261019.afd1dcf latest | 2026-10-19 | afd1dcf | 14,117 B | A | view · diff |
| git:20261018.7b1c7bc | 2026-10-18 | 7b1c7bc | 14,091 B | A | view · diff |
| git:20261016.de16d0d | 2026-10-16 | de16d0d | 13,486 B | A | view · diff |
| git:20261016.d241ff1 | 2026-10-16 | d241ff1 | 11,906 B | A | view · diff |
| git:20261016.e79fa84 | 2026-10-16 | e79fa84 | 12,590 B | A | view · diff |
| git:20261014.e918bad | 2026-10-14 | e918bad | 11,885 B | A | view · diff |
| git:20261012.7f9a0ba | 2026-10-12 | 7f9a0ba | 12,008 B | A | view · diff |
| git:20261012.90a6b12 | 2026-10-12 | 90a6b12 | 12,615 B | A | view · diff |
| git:20261012.3213224 | 2026-10-12 | 3213224 | 12,012 B | A | view · diff |
| git:20261012.3233653 | 2026-10-12 | 3233653 | 11,961 B | A | view · diff |
| git:20261011.8dd6aa2 | 2026-10-11 | 8dd6aa2 | 11,114 B | A | view · diff |
| git:20261008.49fc23d | 2026-10-08 | 49fc23d | 11,054 B | B | view · diff |
| git:20260916.898c818 | 2026-09-16 | 898c818 | 18,082 B | B | view · diff |
| git:20260908.277fe26 | 2026-09-08 | 277fe26 | 17,971 B | B | view · diff |
| git:20260907.6120749 | 2026-09-07 | 6120749 | 17,270 B | B | view · diff |
| git:20260906.9a46d77 | 2026-09-06 | 9a46d77 | 14,994 B | B | view · diff |
| git:20260905.62f4f7c | 2026-09-05 | 62f4f7c | 12,245 B | B | view · diff |
| git:20260903.dbc25ec | 2026-09-03 | dbc25ec | 11,578 B | B | view · diff |
| git:20260903.d1f8b04 | 2026-09-03 | d1f8b04 | 10,934 B | B | view · diff |
| git:20260902.bfe286a | 2026-09-02 | bfe286a | 10,572 B | B | view · diff |
| git:20260901.3687a82 | 2026-09-01 | 3687a82 | 10,230 B | B | 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 (14117 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
exmergo/dex · 88 stars · license Apache-2.0 · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_dgkxwweynivpepp3 GET https://markdownregistry.com/api/v1/resolve?ref=exmergo/dex/maintain GET https://markdownregistry.com/api/v1/blob/a9d21172ce6dc6bc86ce8307f3e160d86cd198307ddbca96cbfd403363de80bb
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.