postgres-explain SKILL.md skillA
postgres-explain from product-on-purpose/agent-skills-toolkit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add product-on-purpose/agent-skills-toolkit/postgres-explain@v0.1.0Pins v0.1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- product-on-purpose/agent-skills-toolkit
- Path
tests/fixtures/audit-corpus-labelled/02-excellent-orphan/skills/postgres-explain/SKILL.md- Versions recorded
- 1
- Latest version
- v0.1.0, committed Nov 1, 2026
- Size
- 1,891 bytes
- Repository stars
- 3
- License
- Apache-2.0
Reads a PostgreSQL EXPLAIN ANALYZE plan, identifies where the time and rows go, and proposes index or query rewrites with the expected effect. Use when the user pastes a query plan, asks why a query is slow, or mentions sequential scans, nested loops, or missing indexes.
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
# postgres-explain ## Purpose Explain a PostgreSQL `EXPLAIN (ANALYZE, BUFFERS)` plan in terms of where time goes, then propose the smallest change that removes the dominant cost. ## Procedure 1. If the user gave a query but no plan, ask them to run `EXPLAIN (ANALYZE, BUFFERS, FORMAT TEXT)` and paste it. Warn that ANALYZE executes the query. 2. Find the node with the largest exclusive time (actual total time minus children). That is the target; ignore everything else until it is addressed. 3. Read the estimate-versus-actual rows on that node. A gap over 10x means stale statistics or a correlation the planner cannot see: propose `ANALYZE <table>` first, or extended statistics for correlated columns. 4. Match the node type to a remedy: - Seq Scan with a selective filter: an index on the filter columns, in filter order, with the most selective first. - Nested Loop with a large outer side: usually a missing index on the inner join key, or a bad row estimate on the outer side. - Hash Join spilling (Batches > 1): raise `work_mem` for the session, or reduce the hashed side. - Sort with external merge: an index matching the ORDER BY, or a smaller working set. …
Read the whole file at its exact version.
How to install
mdr add product-on-purpose/agent-skills-toolkit/postgres-explain@sha256:814f18a2ad31821dThe line at the top of this page pins the label v0.1.0, 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_qq3c2ytu6t2tolqf)
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Versions
The registry has recorded 1 version of this file, committed on Nov 1, 2026.
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 (1891 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
product-on-purpose/agent-skills-toolkit · 3 stars · license Apache-2.0 · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_qq3c2ytu6t2tolqf GET https://markdownregistry.com/api/v1/resolve?ref=product-on-purpose/agent-skills-toolkit/postgres-explain GET https://markdownregistry.com/api/v1/blob/814f18a2ad31821d1ec1ab0f1350b22acf2f03a829c463eaf244daf942eb26c3
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.