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/sophymarine/openregistrynpx agentmods add skills/sophymarine/openregistry/netherlands-kvkWrote 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/sophymarine/openregistry/netherlands-kvk)<a href="https://agentmods.dev/skills/sophymarine/openregistry/netherlands-kvk"><img src="https://agentmods.dev/badge/skills/sophymarine/openregistry/netherlands-kvk/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/sophymarine/openregistry/netherlands-kvk"><img src="https://agentmods.dev/badge/skills/sophymarine/openregistry/netherlands-kvk.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 | $0.00000 | $0.00904 |
| Opus 5 | $0.00000 | $0.00452 |
| Sonnet 5 | $0.00000 | $0.00181 |
| Haiku 4.5 | $0.00000 | $0.00090 |
Grade A, and why
Netherlands — KVK Lookup 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.
How it starts
The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Netherlands — KVK Lookup
Live, direct-to-government access to Kamer van Koophandel (KVK) — Handelsregister, Open Dataset APIs.
Single-country variant of the cross-border Cross-Border UBO Chain Walker. Use this skill when the user is explicitly focused on Netherlands.
What you get
- Direct query to KVK. Every tool call hits Kamer van Koophandel (KVK) — Handelsregister, Open Dataset APIs at the moment you ask. No nightly scrape, no aggregator middle layer.
- Unmodified responses. Field names, status codes, and (where available) raw filing bytes are returned exactly as the registry's own system emits them.
- Native ID format support. 8-digit KVK number (e.g.
33002587for ASML Holding NV). - Sample entity: ASML Holding NV.
Available tools (jurisdiction = NL)
get_company_profile, list_filings, get_financials
For every tool, pass jurisdiction: "NL" (case-insensitive).
Example prompts
Pull ASML Holding NV's latest deposited annual accounts in iXBRL format
Confirm the legal status of Adyen NV (KVK 34259528)
Get the most recent filings list for ING Groep NV
Workflow
Step 1 — Resolve the entity
search_companies({ jurisdiction: "NL", query: "<name or ID>" })
get_company_profile({ jurisdiction: "NL", company_id: "<id>" })
Step 2 — Pull the relevant register slice
Pick from the available tools list above. For UBO walks across borders, return to the Cross-Border UBO Chain Walker.
Quirks specific to Netherlands
- Post CJEU C-37/20 — the KVK UBO-register is access-restricted to AML-obliged entities.
get_persons_with_significant_controlreturns 501 withalternative_url. - Officer data is not in the KVK Open Dataset; for directors of Dutch entities the official paid channel is KVK Handelsregister Inzage.
- Financial statements are filed at KVK as iXBRL (jaarrekeningen).
get_financialsreturns the latest deposited annual accounts. - Dutch holding companies (BV/NV) are common in cross-border structures — use this as a hop in UBO chains.
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 · 73 lines · 0 tokens per session scan A 5654ec898d9b
Netherlands — KVK Lookup is a skill published in the GitHub repository sophymarine/openregistry (17 stars, last pushed 4d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 904 tokens. 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 2026-08-30.
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