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sql

sql is a skill for Claude Code from mrlm-xyz/demo-claude-marketplace. It costs 18 tokens per session (257 once invoked), scanned A, original, Apache-2.0.

A skill for writing and improving SQL, the language used to query and manage relational databases. It focuses on query performance, indexes, and data modelling.

In plain words
What is it for?
Use it to write queries, interpret execution plans, choose indexes, design schemas, handle null values, and optimise joins, subqueries, and window functions.
Why use it?
It helps make database queries easier to maintain and faster on large datasets while preserving data correctness.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the data-toolkit plugin — 2 skills, 2 commands, 2 agents shipped together

not rated 35repo +1 2mo ago A scan SkillSpector: pass 18 tokens original Apache-2.0

Good fit Use it to write queries, interpret execution plans, choose indexes, design schemas, handle null values, and optimise joins, subqueries, and window functions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/mrlm-xyz/demo-claude-marketplace/sql
View source ↗ mrlm-xyz/demo-claude-marketplace
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 mrlm-xyz/demo-claude-marketplace --skill sql
Clone the repo
git clone --depth 1 https://github.com/mrlm-xyz/demo-claude-marketplace

Made for: Claude Code.

Or install data-toolkit, the plugin that ships this one along with the rest of its 2 skills, 2 commands, 2 agents.

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

README.md
[![agentmods](https://agentmods.dev/badge/skills/mrlm-xyz/demo-claude-marketplace/sql/github.svg)](https://agentmods.dev/skills/mrlm-xyz/demo-claude-marketplace/sql)
Your own site
<a href="https://agentmods.dev/skills/mrlm-xyz/demo-claude-marketplace/sql"><img src="https://agentmods.dev/badge/skills/mrlm-xyz/demo-claude-marketplace/sql/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

Your own site · 80×15
<a href="https://agentmods.dev/skills/mrlm-xyz/demo-claude-marketplace/sql"><img src="https://agentmods.dev/badge/skills/mrlm-xyz/demo-claude-marketplace/sql.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 257 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original 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 $0.00018 $0.00257
Opus 5.5 $0.00007 $0.00103
Sonnet 5.5 $0.00004 $0.00051
Haiku 4.5 $0.00002 $0.00026

Measured 2mo ago against content hash 97387ecfe017, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sql 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.

claude-plugins/data-toolkit/skills/sql/SKILL.md · 35 lines

What it actually says

SQL Skill

You are a SQL expert with deep knowledge of query optimization, indexing, and data modeling. Write efficient, maintainable SQL for analytics and data pipelines.

Core Principles

  • Query optimization matters — understand execution plans
  • Index strategically — balance read performance with write overhead
  • Normalize for integrity, denormalize for performance
  • Use CTEs for readability, subqueries when necessary
  • Window functions over self-joins when possible
  • Explicit joins over implicit — be clear about relationships
  • Handle nulls explicitly — three-valued logic is subtle
  • Test with production-scale data volumes

Best Practices

Write queries that are easy to read and maintain. Use meaningful aliases and consistent formatting. Add comments for complex logic. Prefer standard SQL over vendor-specific extensions when possible. Use appropriate data types and constraints. Design indexes based on query patterns. Monitor query performance and optimize bottlenecks.

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 · 35 lines · 18 tokens per session scan A 97387ecfe017

Subscribe to this mod's changes

sql is a skill published in the GitHub repository mrlm-xyz/demo-claude-marketplace (35 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 18 tokens to every session and 257 once invoked, about $0.0001 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 compared with skills from other repositories

sql next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
sqlmrlm-xyz/demo-claude-marketplaceSkill352mo agoApache-2.0A18Claude Code
create-prprisma/ormSkill48ktodayApache-2.0A48Claude Code, Codex
schema-explorationlangchain-ai/deepagentsSkill31ktodayMITA57Claude Code, Codex
atlas-mssqlariga/atlasSkill8.8k4d agoApache-2.0A163Claude Code
ha-data-storesshiwenwen/hope-agentSkill1.9ktodayMITA115Claude Code, Codex
nornicdb-cypher-queriesorneryd/NornicDBSkill924todayMITA79Claude Code, Codex
volcengine-rds-postgresqlbytedance/agentkit-samplesSkill4843d agoApache-2.0A63Claude Code, Codex