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Query Optimization

Checked
josiahsiegel·vlatest·database·MIT

Helps with querying, optimization as part of agent workflows workflows.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add josiahsiegel/claude-plugin-marketplace --skill query-optimization -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

josiahsiegel

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

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  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

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  • No pipe-to-shell installers: passed

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    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned josiahsiegel/claude-plugin-marketplace at 5a1b1123b9.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
5a1b1123b9
Manifest
plugins/tsql-master/skills/query-optimization/SKILL.md
Scanned
3 files, 642 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
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About this skill

What it does

This skill provides a comprehensive guide to T-SQL query optimization techniques, enabling AI agents to analyze and improve database queries. It focuses on identifying non-SARGable patterns, understanding join type performance characteristics, and utilizing query hints for enhanced efficiency. The goal is to help agents generate more performant SQL queries within agent workflows.

When to use it

  • When an AI agent needs to optimize existing T-SQL queries for improved performance.
  • When designing new database queries and needing guidance on SARGable patterns.
  • To understand the tradeoffs between different join types (Nested Loop, Merge Join, Hash Join).
  • When troubleshooting slow query execution times and identifying potential bottlenecks.

Key capabilities

  • SARGability Identification: Distinguishes between SARGable (index-seeking) and non-SARGable query patterns with examples.
  • Join Type Performance Analysis: Provides a comparison of Nested Loop, Merge Join, and Hash Join types, outlining their best use cases and characteristics.
  • Query Hint Reference: Offers a quick reference guide to T-SQL query hints for controlling compilation, optimization, parallelism, and data access.
  • Implicit Conversion Awareness: Highlights the importance of avoiding implicit data type conversions in queries.

Example prompts

  • "Can you rewrite this SQL query to be more SARGable?" [followed by a non-SARGable query]
  • "What are the performance characteristics of a Nested Loop join compared to a Hash Join?"
  • "How can I use query hints to limit parallelism in my T-SQL query?"

Tips & gotchas

  • This skill focuses specifically on T-SQL query optimization.
  • Understanding database indexes is crucial for effectively applying the techniques described within this guide.
  • Be mindful of potential dirty reads when using WITH (NOLOCK).