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 loonheffingen-en-werkkostengit 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/loonheffingen-en-werkkosten)<a href="https://agentmods.dev/skills/johnhout/knowledge-work-belastingzaken/loonheffingen-en-werkkosten"><img src="https://agentmods.dev/badge/skills/johnhout/knowledge-work-belastingzaken/loonheffingen-en-werkkosten/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/loonheffingen-en-werkkosten"><img src="https://agentmods.dev/badge/skills/johnhout/knowledge-work-belastingzaken/loonheffingen-en-werkkosten.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 | $0.00075 | $0.00318 |
| Opus 5 | $0.00037 | $0.00159 |
| Sonnet 5 | $0.00015 | $0.00064 |
| Haiku 4.5 | $0.00007 | $0.00032 |
Grade A, and why
loonheffingen-en-werkkosten 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
Loonheffingen en Werkkosten
Use this skill to prepare payroll tax processes and WKR-oriented checks.
Scope
- Payroll period control workflow
- Loonheffing evidence checks
- WKR attention point tracking
Boundaries
- Do not provide final legal or payroll advice.
- Do not conclude compliance without verified evidence.
- Keep unresolved classification issues explicit.
Workflow
- Confirm employer entity and period scope.
- Reconcile payroll administration figures with source exports.
- Check for unusual deviations and categorization issues.
- Prepare filing-readiness and follow-up checklist.
Official Source Verification
- Verify payroll filing requirements and timing on
belastingdienst.nl. - Verify article-level references on
wetten.overheid.nlwhere needed. - Include URL and retrieval date.
- Mark claims as unverified if official references are unavailable.
Escalation Points
Escalate when:
- Employee/tax classification is unclear
- WKR treatment has high financial impact
- Reconciliation gaps remain unresolved
- Significant corrections are required
Safety
This skill supports payroll tax workflows and does not replace professional 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 · 75 tokens per session scan A ed55b6d9865d
loonheffingen-en-werkkosten is a skill published in the GitHub repository johnhout/knowledge-work-belastingzaken (6 stars, last pushed 7mo ago), licensed MIT. It adds 75 tokens to every session and 318 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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