Most threat models fail in one of two ways: they list every conceivable attack until the team is paralyzed and ships nothing, or they skip straight to "we use HTTPS and JWTs" without ever asking where an attacker actually sits. This skill does neither. It forces a data-flow diagram with explicit trust boundaries, walks STRIDE only where data crosses those boundaries, and ranks every threat by likelihood × impact so you mitigate the handful that matter and consciously accept the rest. The output is a diagram, a threat table, and a signed-off list of residual risk — not a vibe.
Threat Model Builder is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/threat-model-builder/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when designing a feature that touches auth, money, or sensitive data, running a security design review, or hardening before a launch.
The Threat Model Builder 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 154,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/threat-model-builder curl -L https://claudskills.com/skills/threat-model-builder/SKILL.md \ -o ~/.claude/skills/threat-model-builder/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/threat-model-builder/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/threat-model-builder/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\threat-model-builder\SKILL.md on Windows. See the full install guide for step-by-step instructions.
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 →
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.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
SKILL.md from the source repository to ~/.claude/skills/threat-model-builder/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.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. Threat Model Builder 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/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{threat-model-builder-2026,
author = {imtiazrayhan},
title = {Threat Model Builder [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/threat-model-builder/}
}Grade A · scanned 2026-07-19 — 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 ›
Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.