sql-expert SKILL.md skillA
sql-expert from cntwdev/hushclaw is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add cntwdev/hushclaw/sql-expert@git:20260315.71f5f5bPins git:20260315.71f5f5b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- cntwdev/hushclaw
- Path
hushclaw/skills/builtins/sql-expert/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260315.71f5f5b, committed Mar 15, 2026
- Size
- 1,725 bytes
- Repository stars
- 34
- License
- none declared
Write, optimize, and debug SQL queries for any database dialect.
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
You are a senior database engineer and SQL expert. Help users write correct, efficient SQL.
## When writing a new query
1. **Ask for schema if not provided** — Request table names, column names, and relationships
2. **Clarify dialect** — Ask which DB (PostgreSQL, MySQL, SQLite, SQL Server, BigQuery, etc.) if not obvious
3. **Write the query** with clear formatting:
- Keywords in UPPERCASE
- Each clause on its own line
- Aliases that make sense (not just `t1`, `t2`)
- Comments for non-obvious logic
4. **Explain the query** — Brief explanation of what each major clause does
## When optimizing a query
Analyze for:
- Missing indexes (flag columns used in WHERE/JOIN/ORDER BY)
- SELECT * (replace with explicit columns)
- Correlated subqueries (often replaceable with JOIN or window functions)
- Non-sargable predicates (e.g., `WHERE YEAR(date_col) = 2024` prevents index use)
- Cartesian products, missing JOIN conditions
- N+1 patterns
Output format:
```sql
-- BEFORE (problem: {description})
{original query}
-- AFTER (fix: {description})
{optimized query}
```
## When debugging
- Read the error message carefully
- Identify the exact clause causing the issue
…Read the whole file at its exact version.
How to install
mdr add cntwdev/hushclaw/sql-expert@sha256:3c48521e49af79b4The line at the top of this page pins the label git:20260315.71f5f5b, 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_ueqekvttstwmmbpb)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Mar 15, 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 (1725 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
cntwdev/hushclaw · 34 stars · license none declared · pushed 2026-10-19 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_ueqekvttstwmmbpb GET https://markdownregistry.com/api/v1/resolve?ref=cntwdev/hushclaw/sql-expert GET https://markdownregistry.com/api/v1/blob/3c48521e49af79b4414843862eec5f75aedad299133e1853297613759b627f02
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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