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pre-factor

pre-factor is a skill for Claude Code, Codex from zvadaadam/az-skills. It costs 129 tokens per session (1,770 once invoked), scanned A, original, no licence file.

A code review before a feature or significant change is implemented. It looks for preparatory refactoring—reorganising existing code so the requested change is easier to add.

In plain words
What is it for?
Use it before building a feature, adding a larger change, or modifying code whose current structure makes the work awkward.
Why use it?
It reduces the risk of forcing a new feature into code that is difficult to change. This can help prevent extra technical debt, meaning future work made harder by earlier shortcuts.

Skill for Claude CodeCodex

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

not rated 51repo changed 1mo ago A scan 129 tokens no licence

Good fit Use it before building a feature, adding a larger change, or modifying code whose current structure makes the work awkward.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/zvadaadam/az-skills/pre-factor
View source ↗ zvadaadam/az-skills
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 zvadaadam/az-skills --skill pre-factor
Clone the repo
git clone --depth 1 https://github.com/zvadaadam/az-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 pre-factor

README.md
[![agentmods](https://agentmods.dev/badge/skills/zvadaadam/az-skills/pre-factor/github.svg)](https://agentmods.dev/skills/zvadaadam/az-skills/pre-factor)
Your own site
<a href="https://agentmods.dev/skills/zvadaadam/az-skills/pre-factor"><img src="https://agentmods.dev/badge/skills/zvadaadam/az-skills/pre-factor/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 pre-factor

Your own site · 80×15
<a href="https://agentmods.dev/skills/zvadaadam/az-skills/pre-factor"><img src="https://agentmods.dev/badge/skills/zvadaadam/az-skills/pre-factor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 129 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,770 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 $0.00129 $0.01770
Opus 5.5 $0.00052 $0.00708
Sonnet 5.5 $0.00026 $0.00354
Haiku 4.5 $0.00013 $0.00177

Measured 1mo ago against content hash 210943498430, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

pre-factor 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 1mo 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.

skills/engineering/pre-factor/SKILL.md · 104 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. 1mo ago Changed · -2 lines 210943498430
  2. 2mo ago First seen · 106 lines · 129 tokens per session scan A b818eec8fcc6

Subscribe to this mod's changes

pre-factor is a skill published in the GitHub repository zvadaadam/az-skills (51 stars, last pushed 26d ago), with no licence file. It adds 129 tokens to every session and 1,770 once invoked, about $0.0005 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.

Code review
Related

pre-factor compared with skills from other repositories

pre-factor next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
pre-factorzvadaadam/az-skillsSkill5126d agononeA129Claude Code, Codex
autoreviewopenclaw/clawhubSkill9.5kyesterdayMITA17Claude Code, Codex
agent-teams-simplify-and-hardenLeoYeAI/openclaw-master-skillsSkill2.2k6d agoMITA115Claude Code, Codex
omh-code-reviewrlaope/oh-my-hermesSkill5.2kyesterdayMITA48Claude Code, Codex
revdiff-planumputun/revdiffSkill945yesterdayMITA84Claude Code
explore-unknownsdzhng/skillsSkill1.4k2d agoMITA162Claude Code, Codex
re0-mergeLilMGenius/paperthinSkill1.4k4d agoMITA70Claude Code