mysql SKILL.md skillA
mysql from ericrisco/rsc-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ericrisco/rsc-harness/mysql@git:20260729.111532cPins git:20260729.111532c in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ericrisco/rsc-harness
- Path
skills/mysql/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260729.111532c, committed Jul 29, 2026
- First version recorded
- Jun 2, 2026
- Size
- 15,048 bytes
- Repository stars
- 236
- License
- MIT
Use when designing, querying, indexing or operating a MySQL or MariaDB database and engine-specific behaviour matters — schema and type choices, index design, reading EXPLAIN, online schema change, replication and replica lag, locking and InnoDB deadlocks, charset traps, and server config. NOT portable SELECT/JOIN/window-function craft (that is `sql`), NOT PostgreSQL engine behaviour like VACUUM or JSONB (that is `postgresdb`), NOT the PlanetScale/Vitess branch-and-deploy workflow…
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
# MySQL / MariaDB engine You are working below portable SQL, at the layer where the answer depends on *which engine* is running. This skill owns MySQL 8.4 LTS and MariaDB 11.8 LTS: the **InnoDB** clustered-index storage model, MySQL-flavoured DDL and types, index design and the leftmost-prefix rule, reading `EXPLAIN` and fixing the plan, online DDL, replication, locking/deadlocks, and day-2 server config. The dividing line is simple: **if the answer is identical on PostgreSQL, it belongs in `sql`, not here.** `sql` owns the dialect-independent SELECT grammar. `mysql` owns how *this* engine stores, plans, locks, and replicates. `postgresdb` is the peer engine for the other database — same body shape, different facts, never the same answer. ## When to use - Designing or reviewing a MySQL/MariaDB schema: engine choice, integer/`DECIMAL`/`VARCHAR` sizing, `utf8mb4` charset/collation, `JSON` + generated/`STORED` columns, PK design for InnoDB. - A query is slow or scans too many rows; reading `EXPLAIN` / `EXPLAIN ANALYZE` / `FORMAT=JSON`. - Choosing or adding an index: composite column order, covering indexes, prefix indexes on `TEXT`, …
Read the whole file at its exact version.
How to install
mdr add ericrisco/rsc-harness/mysql@sha256:a2769fab7a6b92c0The line at the top of this page pins the label git:20260729.111532c, 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_nktfnpqckpwyiq2m)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jun 2, 2026 and Jul 29, 2026, about one every 57 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260729.111532c latest | 2026-07-29 | 111532c | 15,048 B | A | view · diff |
| git:20260602.a440d62 | 2026-06-02 | a440d62 | 15,429 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 (15048 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
ericrisco/rsc-harness · 236 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_nktfnpqckpwyiq2m GET https://markdownregistry.com/api/v1/resolve?ref=ericrisco/rsc-harness/mysql GET https://markdownregistry.com/api/v1/blob/a2769fab7a6b92c0097132a735186a16cad1a4f44f3c03fff5deb3f119b0a8a0
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.
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