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Syntherklaas

Category: Security  ·  Sub-category: web-security  ·  Last updated:
Generate synthetic data from scratch through an interactive dialog — ask the user table-by-table about columns, types, foreign keys, and constraints; render the data model as ASCII UML; ask for volume + distributions; then generate consistent fake data with Faker (locale-aware) + NL-locked providers for BSN/IBAN/postcode. Outputs CSV (loose files), XLSX (loose or multi-sheet), or SQLite. Schema can be saved to YAML for re-invoke (`/syntherklaas <yaml-path>` skips the dialog, runs deterministic generation). Use when the user wants test data, demo data, fake data with FK relations, or mentions "synthetic data", "fake data", "test data", "demo dataset", "BSN-safe test data", or "anonimiseer me een schema".
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Interactive synthetic data generator. Two invocation paths:

What this skill does

Syntherklaas is a community-contributed Claude Code skill in the web-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/syntherklaas/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user wants test data, demo data, fake data with FK relations, or mentions "synthetic data", "fake data", "test data", "demo dataset", "BSN-safe test data", or "anonimiseer me een schema".

Who uses this skill

The Syntherklaas Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 153,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/syntherklaas
curl -L https://claudskills.com/skills/syntherklaas/SKILL.md \
  -o ~/.claude/skills/syntherklaas/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/syntherklaas/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/syntherklaas/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\syntherklaas\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Syntherklaas Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/syntherklaas/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Syntherklaas skill do?
Generate synthetic data from scratch through an interactive dialog — ask the user table-by-table about columns, types, foreign keys, and constraints; render the data model as ASCII UML; ask for volume + distributions; then generate consistent fake data with Faker (locale-aware) + NL-locked providers for BSN/IBAN/postcode. Outputs CSV (loose files), XLSX (loose or multi-sheet), or SQLite. Schema can be saved to YAML for re-invoke (`/syntherklaas <yaml-path>` skips the dialog, runs deterministic generation). Use when the user wants test data, demo data, fake data with FK relations, or mentions "synthetic data", "fake data", "test data", "demo dataset", "BSN-safe test data", or "anonimiseer me een schema".
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Syntherklaas skill?
Use Syntherklaas when your Claude Code task falls under the Security category — specifically in the web security area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Syntherklaas" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Syntherklaas skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Syntherklaas is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
baswenneker. (2026). Syntherklaas [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/syntherklaas/
BibTeX
@misc{syntherklaas-2026,
  author    = {baswenneker},
  title     = {Syntherklaas [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/syntherklaas/}
}

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Security scan

Grade A · scanned 2026-07-18 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

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[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/syntherklaas/#security)

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More Security skills

Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills
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