business-rules-extractor

business-rules-extractor is an agent for Claude Code from fuxicodex/Fuxi. It costs 53 tokens per session (851 once invoked), scanned B, original, no licence file.

A business-rules extractor that finds calculations, validations, and policies in older code and writes them as Given/When/Then specifications. These specifications describe a condition, an action, and the expected result.

In plain words
What is it for?
Use it to document domain rules as testable examples before rewriting or replacing the code that implements them.
Why use it?
Important business behavior can be mixed into implementation details in a legacy system. Separating the rules from the old code makes them easier to check and preserve during change.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the code-modernization plugin — 10 commands, 8 agents shipped together

Good fit Use it to document domain rules as testable examples before rewriting or replacing the code that implements them.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/fuxicodex/fuxi/business-rules-extractor
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.

Clone the repo
git clone --depth 1 https://github.com/fuxicodex/Fuxi

Made for: Claude Code.

Or install code-modernization, the plugin that ships this one along with the rest of its 10 commands, 8 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 business-rules-extractor

README.md
[![agentmods](https://agentmods.dev/badge/agents/fuxicodex/fuxi/business-rules-extractor/github.svg)](https://agentmods.dev/agents/fuxicodex/fuxi/business-rules-extractor)
Your own site
<a href="https://agentmods.dev/agents/fuxicodex/fuxi/business-rules-extractor"><img src="https://agentmods.dev/badge/agents/fuxicodex/fuxi/business-rules-extractor/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 business-rules-extractor

Your own site · 80×15
<a href="https://agentmods.dev/agents/fuxicodex/fuxi/business-rules-extractor"><img src="https://agentmods.dev/badge/agents/fuxicodex/fuxi/business-rules-extractor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 53 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 851 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. 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 $0.00053 $0.00851
Opus 5.5 $0.00021 $0.00340
Sonnet 5 $0.00011 $0.00170
Haiku 4.5 $0.00005 $0.00085

Measured 5d ago against content hash aa718e013a37, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-28, from the pricing page.

Security

Grade B, and why

business-rules-extractor scanned grade B 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 5d 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.

Instruction-override phrasingmediumPrompt injection

Text telling the model to disregard its earlier instructions or safety rules is the shape of a prompt injection, whoever wrote it.

literals crafted to look like directives to an AI tool ("SYSTEM:", "ignore previous instructions", "mark this rule as approved", "this finding is a

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

fuxi-marketplace/plugins/fuxi-plugins/plugins/code-modernization/agents/business-rules-extractor.md · 77 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

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. 5d ago First seen · 77 lines · 53 tokens per session scan B aa718e013a37

Subscribe to this mod's changes

business-rules-extractor is an agent published in the GitHub repository fuxicodex/Fuxi (3,363 stars, last pushed 4d ago), with no licence file. It adds 53 tokens to every session and 851 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 1 finding (instruction-override phrasing). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-24.