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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".

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 69,000+ 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.

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

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See pricing → Download desktop app

Attribution & license

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
Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills.  ·  What's New  ·  Install guide  ·  About  ·  llms.txt

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