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.
npx skills add rossumai/claude-marketplace --skill business-rules-referencegit clone --depth 1 https://github.com/rossumai/claude-marketplaceWrote 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.
[](https://agentmods.dev/skills/rossumai/claude-marketplace/business-rules-reference)<a href="https://agentmods.dev/skills/rossumai/claude-marketplace/business-rules-reference"><img src="https://agentmods.dev/badge/skills/rossumai/claude-marketplace/business-rules-reference/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.
<a href="https://agentmods.dev/skills/rossumai/claude-marketplace/business-rules-reference"><img src="https://agentmods.dev/badge/skills/rossumai/claude-marketplace/business-rules-reference.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00203 | $0.00539 |
| Opus 5 | $0.00102 | $0.00269 |
| Sonnet 5 | $0.00041 | $0.00108 |
| Haiku 4.5 | $0.00020 | $0.00054 |
Grade A, and why
business-rules-reference 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 11d 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.
What it actually says
Rossum Business Rules & Validation Reference
Rossum validates extracted data and blocks automation in two ways. This pack covers the feature end-to-end for both:
- Native Rossum Rules (
POST /v1/rules) — the modern, platform-native path: a booleantrigger_conditionplus anactions[]array, evaluated at validation time. The condition is TxScript (field.Xaccess) — for that expression syntax see thetxscript-referenceskill. This pack owns the entity, the JSON shape,actions[]types, FIRE-vs-PASS polarity, and action pairings. - Legacy Business Rules Validation extension — a Store hook configured with a
checks[]array, running at the end of the extension chain. It has its own curly-brace expression engine (has_value({field}),{value, default=0},similarity()), documented in full here because nothing else uses it.
See reference.md for the full reference. Consult it when authoring or debugging either kind of rule, choosing between them, or reading a checks[] config.
Cross-references:
txscript-reference— the TxScript expression language for native Ruletrigger_conditions (and hooks/formulas). Native Rules usefield.X; the BRV extension uses a different{field}-brace engine documented here.rossum-reference— the/v1/rulesand/v1/triggersendpoint basics and the platform overview.
What ships with it
1 file 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.
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.
- 11d ago First seen · 20 lines · 203 tokens per session scan A 05be1dfa9bee
business-rules-reference is a skill published in the GitHub repository rossumai/claude-marketplace (5 stars, last pushed 2d ago), licensed MIT. It adds 203 tokens to every session and 539 once invoked, about $0.0010 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 2026-08-31.
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