Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/johnhout/knowledge-work-belastingzakennpx agentmods add commands/johnhout/knowledge-work-belastingzaken/tax-calendarWrote 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/commands/johnhout/knowledge-work-belastingzaken/tax-calendar)<a href="https://agentmods.dev/commands/johnhout/knowledge-work-belastingzaken/tax-calendar"><img src="https://agentmods.dev/badge/commands/johnhout/knowledge-work-belastingzaken/tax-calendar/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/commands/johnhout/knowledge-work-belastingzaken/tax-calendar"><img src="https://agentmods.dev/badge/commands/johnhout/knowledge-work-belastingzaken/tax-calendar.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 | $0.00006 | $0.00404 |
| Opus 5 | $0.00003 | $0.00202 |
| Sonnet 5 | $0.00001 | $0.00081 |
| Haiku 4.5 | $0.00001 | $0.00040 |
Grade A, and why
tax-calendar 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 10d 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
Tax Calendar / Belastingkalender
If placeholders are unclear, see CONNECTORS.md.
Important / Belangrijk: This workflow support is not legal or fiscal advice. Require review by a qualified Dutch tax professional.
Create a tax deadline calendar for Dutch obligations with official-source verification.
Usage
/belastingadviseur:tax-calendar <belastingjaar> [profieltype]
Workflow
- Determine scope:
- Year and profile (
particulier,zzp,bv) - Filing frequencies (monthly/quarterly/annual)
- Determine obligation set:
- Include only applicable categories (IB, BTW, VPB, loonheffingen, and related tasks)
- Label optional vs mandatory milestones
- Verify every deadline:
- Check
belastingdienst.nlfor operational deadlines and filing windows - Check
wetten.overheid.nlwhen legal timing basis must be cited - Record verification URL and retrieval date for each date-sensitive claim
- Build practical planning layer:
- Add internal buffer dates (prep/review/sign-off)
- Flag dependencies on external data and approvals
- Fallback behavior:
- If no connectors are available, produce the same calendar with explicit assumptions and manual document requirements
- If official source cannot be verified, mark item as unverified and do not present as final
Required Output Format (Use Exactly)
Context / ContextAssumptions / AannamesRequired Documents / Benodigde stukkenStep-by-step / StappenplanChecks & Risks / Controles en risico'sNext Actions / Volgende actiesSources (official) / Bronnen (officieel)Professional Review Disclaimer / Disclaimer deskundige beoordeling
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.
- 10d ago First seen · 53 lines · 6 tokens per session scan A e6fe9ece4368
tax-calendar is a command published in the GitHub repository johnhout/knowledge-work-belastingzaken (6 stars, last pushed 6mo ago), licensed MIT. It adds 6 tokens to every session and 404 once invoked, about $0.0000 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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