Claude Code Skills·Claude Skills·The open SKILL.md registry for Claude
ClaudSkills / Security / appsec-tools

Form 4684

Category: Security  ·  Sub-category: appsec-tools  ·  Last updated:
Use this skill when an individual taxpayer or solo business owner needs to report a casualty loss, theft loss, or disaster-related property loss on IRS Form 4684. Triggers on phrases like "casualty loss", "theft loss", "Form 4684", "federally declared disaster deduction", "Hurricane casualty deduction", "fire damage tax deduction", "stolen laptop tax write-off", "deduct flood damage", or any request to claim a §165 loss on personal-use or business property. Do NOT use for: business property SALES (use the form-4797 skill); insurance recoveries already received that simply adjust basis with no remaining loss; involuntary conversions where the taxpayer is electing to defer gain under §1033 (different reporting path).
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

This skill produces an audit-grade Form 4684 from a description of damaged or stolen property. It walks the agent through the four sections (A: personal-use property; B: business and income-producing property; C: Ponzi-type investment scheme theft loss under Rev. Proc. 2009-20; D: election to deduct a federally declared disaster loss in the preceding year), applies the §165 limitation rules (especially the disaster restriction in §165(h)(5) for personal-use property and the qualified disaster loss rules in §165(h)(6)), computes the loss, and emits a deliverable the user can transcribe to a…

What this skill does

Form 4684 is a community-contributed Claude Code skill in the appsec-tools sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/form-4684/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Form 4684 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 211,000+ 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/form-4684
curl -L https://claudskills.com/skills/form-4684/SKILL.md \
  -o ~/.claude/skills/form-4684/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/form-4684/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/form-4684/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\form-4684\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 Form 4684 Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/form-4684/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Form 4684 skill do?
Use this skill when an individual taxpayer or solo business owner needs to report a casualty loss, theft loss, or disaster-related property loss on IRS Form 4684. Triggers on phrases like "casualty loss", "theft loss", "Form 4684", "federally declared disaster deduction", "Hurricane casualty deduction", "fire damage tax deduction", "stolen laptop tax write-off", "deduct flood damage", or any request to claim a §165 loss on personal-use or business property. Do NOT use for: business property SALES (use the form-4797 skill); insurance recoveries already received that simply adjust basis with no remaining loss; involuntary conversions where the taxpayer is electing to defer gain under §1033 (different reporting path).
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 Form 4684 skill?
Use Form 4684 when your Claude Code task falls under the Security category — specifically in the appsec tools 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 Form 4684" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Form 4684 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. Form 4684 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
jupid-tax. (2026). Form 4684 [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/form-4684/
BibTeX
@misc{form-4684-2026,
  author    = {jupid-tax},
  title     = {Form 4684 [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/form-4684/}
}

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Security scan

Grade A · scanned 2026-10-25 — 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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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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