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sql-optimization-patterns

sql-optimization-patterns is a skill for Claude Code, Codex from ynulihao/AgentSkillOS. It costs 44 tokens per session (3,400 once invoked), scanned A, original, no licence file.

A set of methods for improving SQL, the language used to query relational databases. It covers query optimization, indexes, and EXPLAIN analysis, which shows how a database plans to run a query.

In plain words
What is it for?
Use it to investigate slow queries, design database indexes and schemas, and improve application database performance.
Why use it?
It helps identify why database queries are slow and choose changes that reduce application wait times.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

not rated 618repo +2 8mo ago A scan 44 tokens no licence

Good fit Use it to investigate slow queries, design database indexes and schemas, and improve application database performance.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ynulihao/agentskillos/sql-optimization-patterns
View source ↗ ynulihao/AgentSkillOS
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add ynulihao/AgentSkillOS --skill sql-optimization-patterns
Clone the repo
git clone --depth 1 https://github.com/ynulihao/AgentSkillOS

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for sql-optimization-patterns

README.md
[![agentmods](https://agentmods.dev/badge/skills/ynulihao/agentskillos/sql-optimization-patterns/github.svg)](https://agentmods.dev/skills/ynulihao/agentskillos/sql-optimization-patterns)
Your own site
<a href="https://agentmods.dev/skills/ynulihao/agentskillos/sql-optimization-patterns"><img src="https://agentmods.dev/badge/skills/ynulihao/agentskillos/sql-optimization-patterns/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for sql-optimization-patterns

Your own site · 80×15
<a href="https://agentmods.dev/skills/ynulihao/agentskillos/sql-optimization-patterns"><img src="https://agentmods.dev/badge/skills/ynulihao/agentskillos/sql-optimization-patterns.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,400 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00044 $0.03400
Opus 5.5 $0.00018 $0.01360
Sonnet 5.5 $0.00009 $0.00680
Haiku 4.5 $0.00004 $0.00340

Measured 2mo ago against content hash bfd74fb05aa7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sql-optimization-patterns scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

data/skill_seeds/sql-optimization-patterns/SKILL.md · 494 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 494 lines · 44 tokens per session scan A bfd74fb05aa7

Subscribe to this mod's changes

sql-optimization-patterns is a skill published in the GitHub repository ynulihao/AgentSkillOS (618 stars, last pushed 8mo ago), with no licence file. It adds 44 tokens to every session and 3,400 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Databases
Related

sql-optimization-patterns compared with skills from other repositories

sql-optimization-patterns next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
sql-optimization-patternsynulihao/AgentSkillOSSkill6188mo agononeA44Claude Code, Codex
create-prprisma/ormSkill48kyesterdayApache-2.0A48Claude Code, Codex
schema-explorationlangchain-ai/deepagentsSkill31kyesterdayMITA57Claude Code, Codex
atlas-mssqlariga/atlasSkill8.8kyesterdayApache-2.0A163Claude Code
ha-data-storesshiwenwen/hope-agentSkill1.9kyesterdayMITA115Claude Code, Codex
nornicdb-cypher-queriesorneryd/NornicDBSkill923yesterdayMITA79Claude Code, Codex
volcengine-rds-postgresqlbytedance/agentkit-samplesSkill484todayApache-2.0A63Claude Code, Codex