explain-interpreter SKILL.md skillA
explain-interpreter from sigistry/marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sigistry/marketplace/explain-interpreter@git:20260826.571bc2fPins git:20260826.571bc2f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sigistry/marketplace
- Path
plugins/sql-safety-net/skills/explain-interpreter/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260826.571bc2f, committed Aug 26, 2026
- First version recorded
- Jul 8, 2026
- Size
- 3,949 bytes
- Repository stars
- 3
- License
- MIT
This skill should be used when the user mentions "EXPLAIN", "explain analyze", "query plan", "slow query", "seq scan", "sequential scan", "nested loop", "index scan", "query optimization", "buffers", "why is this query slow", or pastes a query plan to interpret. It provides a methodology for reading Postgres and MySQL query plans and turning them into concrete index or rewrite recommendations.
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
# Explain Interpreter ## Purpose Provide a standardized way to read a query plan, Postgres or MySQL, text or JSON, and convert it into a plain-language diagnosis and a concrete fix, statically, from pasted output. A plan is a tree of nodes; the database executes the leaves first and passes rows up. The skill is knowing which node is actually eating the time and what that node's presence implies. ## Reading methodology 1. **Identify the format and whether it was analyzed.** `EXPLAIN` alone gives *estimates*; `EXPLAIN ANALYZE` (Postgres) / `EXPLAIN ANALYZE` (MySQL 8) gives *actual* rows, time, and loops. Only actuals prove a bad estimate. 2. **Find the dominant node.** Read inside-out. A node's cost/time includes its children, so compute **self time** = node time − children's time, and for inner nodes of a loop, **multiply by `loops`**. The node with the largest self time (not the root) is the target. 3. **Read the node's meaning** (see `references/postgres-explain-nodes.md` / `references/mysql-explain.md`). 4. **Scan for red flags** (below). 5. **Prescribe** an index (right columns, right order) or a rewrite. ## The single most important number: estimate vs actual …
Read the whole file at its exact version.
How to install
mdr add sigistry/marketplace/explain-interpreter@sha256:b2acb7ceb09ea45bThe line at the top of this page pins the label git:20260826.571bc2f, 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_zvlfuk54stfgbtfc)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jul 8, 2026 and Aug 26, 2026, about one every 24 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260826.571bc2f latest | 2026-08-26 | 571bc2f | 3,949 B | A | view · diff |
| git:20260715.fcd8714 | 2026-07-15 | fcd8714 | 3,949 B | A | view · diff |
| git:20260708.c0884a9 | 2026-07-08 | c0884a9 | 3,961 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 (3949 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
sigistry/marketplace · 3 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_zvlfuk54stfgbtfc GET https://markdownregistry.com/api/v1/resolve?ref=sigistry/marketplace/explain-interpreter GET https://markdownregistry.com/api/v1/blob/b2acb7ceb09ea45b451acf35660c6340eb074eb8c1505ae007f1f83ffdc2d3a0
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.