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 cyanxxy/nl-tax-agent-skills --skill nl-tax-winstgit clone --depth 1 https://github.com/cyanxxy/nl-tax-agent-skillsWrote 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/cyanxxy/nl-tax-agent-skills/nl-tax-winst)<a href="https://agentmods.dev/skills/cyanxxy/nl-tax-agent-skills/nl-tax-winst"><img src="https://agentmods.dev/badge/skills/cyanxxy/nl-tax-agent-skills/nl-tax-winst/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/cyanxxy/nl-tax-agent-skills/nl-tax-winst"><img src="https://agentmods.dev/badge/skills/cyanxxy/nl-tax-agent-skills/nl-tax-winst.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00041 | $0.05023 |
| Opus 5 | $0.00020 | $0.02511 |
| Sonnet 5 | $0.00008 | $0.01005 |
| Haiku 4.5 | $0.00004 | $0.00502 |
Grade A, and why
nl-tax-winst 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.
How it starts
The opening of the file, as written. The whole thing — 307 lines — stays where its author put it; the contents beside it link to each section on GitHub.
NL Tax Winst uit onderneming
Background helper with two modes that are never blended:
- Annual 2025 profit determination: determine the belastbare winst uit
onderneming for an IB-ondernemer by following the ordered chain in
winstberekening-2025.md-- from a finalized profit-and-loss statement and finalized balance, through the investeringsaftrek, the ondernemersaftrek and the MKB-winstvrijstelling. Return that amount with every line of its derivation, its provenance, and its open questions to the annual workflow, which owns the box 1 total and every artifact. - Provisional 2026 expected-profit forecast: record the taxpayer's sourced,
user-reviewed forecast for
Winst uit ondernemingasonderneming.geschatte_winst. Do not prepare annual accounts, annual deductions, a Zvw amount, cessation profit, or final tax; raise the separate voorlopige aanslag Zvw with the taxpayer without sizing it.
This helper may be called through a Skill/Task tool or inlined by an owning workflow when no such tool exists. The same output contract applies either way.
Read first
Resolve every workspace/... path against workspace_root from
session-progress.yaml (or profile.yaml); never create a second workspace/
tree. _shared/ is the plugin-shared folder at this skill's ../_shared/.
Read ../_shared/runtime-contract.md first. Resolve bundled files relative to
this skill directory with the host's skill-resource or file tools. Do not
depend on shell visibility or vendor-specific environment variables.
Select the owning workflow's mode before loading mode-specific material. Never load both modes for comparison.
For annual 2025 profit determination, read the reviewed 2025 knowledge notes
below. They are canonical for every rate, amount, and threshold. Never
paraphrase a figure from memory; return each loaded source_id to the owning
workflow so it can append the ID to the active workflow's
session-progress.yaml → sources_loaded_by_workflow list and mirror it in
top-level sources_loaded. Always read the first three. Open each remaining
note when the taxpayer's own facts touch it, and report the exact path when one
cannot be opened:
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 307 lines · 41 tokens per session scan A 23366711cb5d
nl-tax-winst is a skill published in the GitHub repository cyanxxy/nl-tax-agent-skills (10 stars, last pushed 17d ago), licensed Apache-2.0. It adds 41 tokens to every session and 5,023 once invoked, about $0.0002 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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