data

A workflow for preparing datasets used to train machine-learning models, with each change tied to problems found during training or testing.

In plain words
What is it for?
Use it to select data needs, build and validate a training dataset, track its sources and transformations, and produce a dataset ready for training.
Why use it?
It helps avoid adding irrelevant or contaminated data and keeps the dataset aligned with the way the model will actually be evaluated.

Skill for Claude CodeCodex

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/simple-agent-lab/autotrainess/data
Any agent
npx skills add simple-agent-lab/AutoTrainess --skill data
Clone the repo
git clone --depth 1 https://github.com/simple-agent-lab/AutoTrainess

Made for: Claude Code, Codex.

Per session 8 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 288 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 $0.00008 $0.00288
Opus 5 $0.00004 $0.00144
Sonnet 5 $0.00002 $0.00058
Haiku 4.5 $0.00001 $0.00029

Measured 2d ago against content hash 6a3b68582d4c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

data 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 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.

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.

autotrainhub/data/SKILL.md · 30 lines

What it actually says

data

Purpose

Prepare training data that addresses real problems exposed by previous training or evaluation, aligns with the benchmark evaluation interface, and is ready for downstream training.

Core principles

  • Drive all data work from concrete problems found in previous training or evaluation.
  • Prioritize alignment with the benchmark's real evaluation interface over broad or generic data expansion.
  • Prefer the smallest effective dataset that addresses the current problems.
  • Keep data sources, transformations, and synthetic generation traceable.
  • Avoid benchmark leakage and contaminated data.

Workflow

  1. Read shared/conventions.md for shared rules.
  2. Run selection/stage.md to identify target data needs and initial source directions.
  3. Run construction/stage.md to turn those needs and directions into a benchmark-aligned training dataset.
  4. Run validation/stage.md for data validation before training.
  5. If validation finds construction issues, return to construction. If validation finds target-need or source-direction issues, return to selection.

Required outputs

  • A final training dataset ready for downstream training.
  • A concise dataset description covering target problems, data sources, sample format, known limitations, and validation status.
Files

What ships with it

4 files 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. 2d ago First seen · 30 lines · 8 tokens per session scan A 6a3b68582d4c

Subscribe to this mod's changes

data is a skill published in the GitHub repository simple-agent-lab/AutoTrainess (21 stars, last pushed 29d ago), licensed MIT. It adds 8 tokens to every session and 288 once invoked, about $0.0000 per session on Opus 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.