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 johnhout/knowledge-work-belastingzaken --skill omzetbelasting-btwgit clone --depth 1 https://github.com/johnhout/knowledge-work-belastingzakenWrote 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/johnhout/knowledge-work-belastingzaken/omzetbelasting-btw)<a href="https://agentmods.dev/skills/johnhout/knowledge-work-belastingzaken/omzetbelasting-btw"><img src="https://agentmods.dev/badge/skills/johnhout/knowledge-work-belastingzaken/omzetbelasting-btw/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/johnhout/knowledge-work-belastingzaken/omzetbelasting-btw"><img src="https://agentmods.dev/badge/skills/johnhout/knowledge-work-belastingzaken/omzetbelasting-btw.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 | $0.00068 | $0.00317 |
| Opus 5 | $0.00034 | $0.00159 |
| Sonnet 5 | $0.00014 | $0.00063 |
| Haiku 4.5 | $0.00007 | $0.00032 |
Grade A, and why
omzetbelasting-btw 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 12d 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
Omzetbelasting BTW
Use this skill to run VAT preparation with period controls and evidence traceability.
Scope
- Monthly/quarterly/annual BTW preparation
- Input/output VAT control checks
- Data quality checks and correction tracking
Boundaries
- Do not finalize filing decisions without evidence completeness.
- Do not provide definitive legal advice.
- Keep all unresolved VAT treatment questions explicitly open.
Workflow
- Confirm period, registration context, and transaction profile.
- Reconcile sales/purchase evidence to VAT categories.
- Identify anomalies and missing invoice support.
- Produce filing readiness output with risk notes.
Official Source Verification
- Verify filing deadlines and practical instructions on
belastingdienst.nl. - Verify legal wording when needed on
wetten.overheid.nl. - Log URL + retrieval date for each rule-sensitive statement.
- Mark unverifiable claims as non-final.
Escalation Points
Escalate when:
- Cross-border VAT treatment is uncertain
- Reverse-charge or special regime treatment is unclear
- Material period-over-period deviations lack explanation
- High-value corrections are needed
Safety
This skill supports process quality and does not replace professional fiscal advice.
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.
- 12d ago First seen · 47 lines · 68 tokens per session scan A c91164ac5575
omzetbelasting-btw is a skill published in the GitHub repository johnhout/knowledge-work-belastingzaken (6 stars, last pushed 7mo ago), licensed MIT. It adds 68 tokens to every session and 317 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 2026-08-31.
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