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 vennootschapsbelasting-vpbgit 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/vennootschapsbelasting-vpb)<a href="https://agentmods.dev/skills/johnhout/knowledge-work-belastingzaken/vennootschapsbelasting-vpb"><img src="https://agentmods.dev/badge/skills/johnhout/knowledge-work-belastingzaken/vennootschapsbelasting-vpb/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/vennootschapsbelasting-vpb"><img src="https://agentmods.dev/badge/skills/johnhout/knowledge-work-belastingzaken/vennootschapsbelasting-vpb.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 | $0.00064 | $0.00317 |
| Opus 5 | $0.00032 | $0.00159 |
| Sonnet 5 | $0.00013 | $0.00063 |
| Haiku 4.5 | $0.00006 | $0.00032 |
Grade A, and why
vennootschapsbelasting-vpb 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
Vennootschapsbelasting VPB
Use this skill for VPB dossier preparation and pre-filing controls.
Scope
- BV VPB workflow planning
- Fiscal bridge from accounting result to taxable profit
- Evidence mapping for adjustments and schedules
Boundaries
- Do not provide final legal/fiscal determinations.
- Do not assume treatment of complex transactions without explicit caveats.
- Keep uncertain tax positions flagged for advisor review.
Workflow
- Establish entity and book-year context.
- Gather financial source data and prior-year context.
- Build adjustment mapping with traceable evidence.
- Flag uncertain positions, missing support, and deadlines.
Official Source Verification
- Verify filing process and deadlines on
belastingdienst.nl. - Verify statutory references on
wetten.overheid.nl. - Cite URL and retrieval date in output.
- If unverifiable, classify as pending verification.
Escalation Points
Escalate when:
- Fiscal unity, mergers, restructurings, or cross-border elements exist
- Material uncertain positions affect filing outcome
- Evidence is incomplete near filing deadlines
Safety
This skill supports VPB workflows only and does not replace professional tax 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.
- 11d ago First seen · 46 lines · 64 tokens per session scan A b8c2b21df965
vennootschapsbelasting-vpb is a skill published in the GitHub repository johnhout/knowledge-work-belastingzaken (6 stars, last pushed 6mo ago), licensed MIT. It adds 64 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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