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 officiele-bronverificatiegit 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/officiele-bronverificatie)<a href="https://agentmods.dev/skills/johnhout/knowledge-work-belastingzaken/officiele-bronverificatie"><img src="https://agentmods.dev/badge/skills/johnhout/knowledge-work-belastingzaken/officiele-bronverificatie/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/officiele-bronverificatie"><img src="https://agentmods.dev/badge/skills/johnhout/knowledge-work-belastingzaken/officiele-bronverificatie.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 | $0.00073 | $0.00341 |
| Opus 5 | $0.00036 | $0.00170 |
| Sonnet 5 | $0.00015 | $0.00068 |
| Haiku 4.5 | $0.00007 | $0.00034 |
Grade A, and why
officiele-bronverificatie 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
Officiele Bronverificatie
Use this skill as the mandatory verification layer for all rule-sensitive tax outputs.
Scope
- Source validation for rates, thresholds, deadlines, and procedural rules
- Legal citation validation for statutory references
- Freshness checks with retrieval-date logging
Boundaries
- Only treat
belastingdienst.nlandwetten.overheid.nlas authoritative. - Do not elevate third-party summaries above official sources.
- Do not present stale or unverifiable claims as final guidance.
Verification Protocol
- Identify each claim that is date/rate/rule dependent.
- Verify practical guidance and deadlines on
belastingdienst.nl. - Verify legal basis text on
wetten.overheid.nlwhere applicable. - Capture exact URL, page topic, and retrieval date (
YYYY-MM-DD). - If source conflict exists, report conflict explicitly and require professional review.
- If source unavailable, mark claim as unverified and stop short of definitive guidance.
Escalation Points
Escalate when:
- Official sources appear to conflict
- No current source confirms a high-impact claim
- Filing or objection timing is near and unresolved
Safety
This skill enforces quality and recency controls; it does not replace professional legal or 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 · 41 lines · 73 tokens per session scan A 8747777278d4
officiele-bronverificatie is a skill published in the GitHub repository johnhout/knowledge-work-belastingzaken (6 stars, last pushed 7mo ago), licensed MIT. It adds 73 tokens to every session and 341 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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