data-data-quality

data-data-quality is a skill for Claude Code, Codex from j4flmao/agent-skills. It costs 142 tokens per session (4,584 once invoked), scanned A, original, MIT.

A guide to checking whether data is complete, accurate, timely, consistent, unique, and structurally valid. It covers tools such as Great Expectations, dbt tests, Soda, and data observability systems.

In plain words
What is it for?
It is for creating validation rules, profiling datasets, checking freshness and schemas, monitoring data, and defining data contracts and SLAs.
Why use it?
It helps find missing, incorrect, outdated, or unexpectedly changed data before people rely on it. It also defines agreed quality targets and responses when they are missed.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions Codex.

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.

agentmods
npx agentmods add skills/j4flmao/agent-skills/data-quality
Any agent
npx skills add j4flmao/agent-skills --skill data-quality
Clone the repo
git clone --depth 1 https://github.com/j4flmao/agent-skills

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 data-data-quality

README.md
[![agentmods](https://agentmods.dev/badge/skills/j4flmao/agent-skills/data-quality.svg)](https://agentmods.dev/skills/j4flmao/agent-skills/data-quality)
Your own site
<a href="https://agentmods.dev/skills/j4flmao/agent-skills/data-quality"><img src="https://agentmods.dev/badge/skills/j4flmao/agent-skills/data-quality.svg" alt="Measured on agentmods" height="20"></a>
Per session 142 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,584 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
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 $0.00142 $0.04584
Opus 5 $0.00071 $0.02292
Sonnet 5 $0.00028 $0.00917
Haiku 4.5 $0.00014 $0.00458

Measured 2d ago against content hash f4b0472ce6b0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

data-data-quality scanned grade A with 1 finding 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 2d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -X POST -H "Content-type: application/json" \
skills/data/data-quality/SKILL.md · 550 lines

How it starts

The opening of the file, as written. The whole thing — 550 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Data Data Quality

Purpose

Build a data quality framework covering quality dimensions (completeness, accuracy, timeliness, consistency, uniqueness, integrity), automated validation tests (Great Expectations expectations suites, data docs, checkpoints; dbt singular, generic, freshness tests), data observability (Soda, Monte Carlo, Elementary), data SLAs with escalation paths, and data contracts.

Agent Protocol

Trigger

Exact user phrases: "data quality", "data validation", "data profiling", "Great Expectations", "dbt tests", "data observability", "data contract", "schema validation", "data quality check", "data testing", "data monitoring", "quality dimensions", "data freshness", "data completeness", "Soda", "Monte Carlo", "data SLA", "data integrity".

Input Context

Before activating, verify:

  • Data stack (warehouse, lake, streaming platform)
  • Transformation tool (dbt, Spark, custom SQL)
  • Data sources and producers (internal, external, partner)
  • Existing monitoring and alerting infrastructure
  • Critical data assets for business operations
  • Data consumers and their quality SLAs

Output Artifact

Data quality framework with dimension definitions, test configurations, monitoring setup, and contract templates.

Response Format

# Quality dimension definitions
# Great Expectations suite
# dbt test config
# Data contract template
# Alert rules
# SLA definitions

No preamble. No postamble. No explanations. No filler/hedging/transitions. Compress output — why use many token when few do trick.

Completion Criteria

  • Quality dimensions defined with measurement approach
  • Automated validation suite (Great Expectations + dbt)
  • Data profiling established for baseline expectations
  • Data observability with monitoring and alerting
  • Data contracts between producers and consumers
  • Quality SLAs documented with escalation paths
  • Soda checks configured for in-storage validation
  • Data integrity checks across referential relationships

Read the full file on GitHub · 550 lines

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. 2d ago First seen · 550 lines · 142 tokens per session scan A f4b0472ce6b0

Subscribe to this mod's changes

data-data-quality is a skill published in the GitHub repository j4flmao/agent-skills (21 stars, last pushed yesterday), licensed MIT. It adds 142 tokens to every session and 4,584 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Related

Other skills, from other repositories