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 inkomstenbelasting-boxengit 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/inkomstenbelasting-boxen)<a href="https://agentmods.dev/skills/johnhout/knowledge-work-belastingzaken/inkomstenbelasting-boxen"><img src="https://agentmods.dev/badge/skills/johnhout/knowledge-work-belastingzaken/inkomstenbelasting-boxen/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/inkomstenbelasting-boxen"><img src="https://agentmods.dev/badge/skills/johnhout/knowledge-work-belastingzaken/inkomstenbelasting-boxen.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 | $0.00077 | $0.00337 |
| Opus 5 | $0.00039 | $0.00169 |
| Sonnet 5 | $0.00015 | $0.00067 |
| Haiku 4.5 | $0.00008 | $0.00034 |
Grade A, and why
inkomstenbelasting-boxen 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
Inkomstenbelasting Boxen
Use this skill to structure IB work with box-level completeness and risk checks.
Scope
- Box-based classification support (box 1, box 2, box 3)
- Evidence mapping per box
- Filing-readiness checklist and issue flags
Boundaries
- Do not decide final tax position without verified support.
- Do not provide binding legal interpretation.
- Keep uncertain positions explicitly labeled.
Workflow
- Identify income/asset categories and assign box context.
- Reconcile supplied figures with supporting documents.
- Flag missing support, anomalies, and prior-year carryover risks.
- Build stepwise filing-preparation checklist.
Official Source Verification
For rates, thresholds, criteria, and deadlines:
- Verify on
belastingdienst.nl. - Verify legal references on
wetten.overheid.nl. - Include URL and retrieval date in outputs.
- Mark non-verified items as pending professional confirmation.
Escalation Points
Escalate when:
- Substantial-interest or complex investment structures exist
- Cross-border assets/income exist
- Material discrepancies are unresolved
- Time-sensitive filing risk is high
Safety
This skill supports tax workflow preparation only and does not provide 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.
- 11d ago First seen · 48 lines · 77 tokens per session scan A c8ae9dc57b35
inkomstenbelasting-boxen is a skill published in the GitHub repository johnhout/knowledge-work-belastingzaken (6 stars, last pushed 6mo ago), licensed MIT. It adds 77 tokens to every session and 337 once invoked, about $0.0004 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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