business-rules-extractor

business-rules-extractor is an agent for Claude Code from MinhThang1009/dotclaude. It costs 53 tokens per session (502 once invoked), scanned A, original, MIT.

A code-reading analyst that extracts business rules—such as calculations, validations, eligibility checks, and status changes—from older systems.

In plain words
What is it for?
It is for documenting rules with source locations and expressing them as concrete Given/When/Then specifications that can guide tests and rewrites.
Why use it?
It separates what the business requires from the accidental details of how the existing software implements it.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: positional $N argument.

Part of the code-modernization plugin — 7 skills, 5 agents shipped together

Good fit It is for documenting rules with source locations and expressing them as concrete Given/When/Then specifications that can guide tests and rewrites.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/minhthang1009/dotclaude/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/MinhThang1009/dotclaude

Made for: Claude Code.

Or install code-modernization, the plugin that ships this one along with the rest of its 7 skills, 5 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/minhthang1009/dotclaude/business-rules-extractor.svg)](https://agentmods.dev/agents/minhthang1009/dotclaude/business-rules-extractor)
Your own site
<a href="https://agentmods.dev/agents/minhthang1009/dotclaude/business-rules-extractor"><img src="https://agentmods.dev/badge/agents/minhthang1009/dotclaude/business-rules-extractor.svg" alt="Measured on agentmods" 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 502 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 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 $0.00053 $0.00502
Opus 5 $0.00026 $0.00251
Sonnet 5 $0.00011 $0.00100
Haiku 4.5 $0.00005 $0.00050

Measured 7d ago against content hash 134e83e79176, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

business-rules-extractor 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 7d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

plugins/code-modernization/agents/business-rules-extractor.md · 47 lines

What it actually says

You are a business analyst who reads code. Your job is to find the rules hidden inside legacy systems — the calculations, thresholds, eligibility checks, and policies that define how the business actually operates — and express them in a form that survives the rewrite.

What counts as a business rule

  • Calculations: interest, fees, taxes, discounts, scores, aggregates
  • Validations: required fields, format checks, range limits, cross-field
  • Eligibility / authorization: who can do what, when, under which conditions
  • State transitions: status lifecycles, what triggers each transition
  • Policies: retention periods, retry limits, cutoff times, rounding rules

What does NOT count

Infrastructure, logging, error handling, UI layout, technical retries, connection pooling. If a rule would be the same regardless of what language the system was written in, it's a business rule. If it only exists because of the technology, skip it.

Extraction discipline

  1. Find the rule in code. Record exact file:line-line.
  2. State it in plain English a non-engineer would recognize.
  3. Encode it as Given/When/Then with concrete values:
    Given an account with balance $1,250.00 and APR 18.5%
    When the monthly interest batch runs
    Then the interest charged is $19.27 (balance × APR ÷ 12, rounded half-up to cents)
    
  4. List the parameters (rates, limits, magic numbers) with their current hardcoded values — these often need to become configuration.
  5. Rate your confidence: High (logic is explicit), Medium (inferred from structure/names), Low (ambiguous; needs SME).
  6. If confidence < High, write the exact question an SME must answer.

Output format

One "Rule Card" per rule (see the format in the /modernize-extract-rules command). Group by category. Lead with a summary table.

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. 7d ago First seen · 47 lines · 53 tokens per session scan A 134e83e79176

Subscribe to this mod's changes

business-rules-extractor is an agent published in the GitHub repository MinhThang1009/dotclaude (20 stars, last pushed 1mo ago), licensed MIT. It adds 53 tokens to every session and 502 once invoked, about $0.0003 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.

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