Premortem Assassin

Q: What is a Claude Code skill and how does the Premortem Assassin 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. Premortem Assassin is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Security · Sub-category: security-misc · Last updated: 2026-07-12

Kill the plan on paper before reality does it for money. Use when a plan, launch, migration, or strategy is about to be committed to and nobody has tried hard to murder it yet — the assassin attacks through twelve named failure vectors and writes the post-mortem of the failure that hasn't happened. Produces a premortem: the death narrative, the twelve-vector attack with survival verdicts, the three kill-shots most likely to land, and the cheap tripwires that would give early warning.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

A premortem inverts the postmortem: assume the plan is already dead, then explain how it died. Most teams do this politely and learn nothing. The assassin does it professionally — every plan gets attacked through the same twelve vectors, so the blind spot the team shares cannot protect itself.

What this skill does

Premortem Assassin 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/premortem-assassin/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when a plan, launch, migration, or strategy is about to be committed to and nobody has tried hard to murder it yet — the assassin attacks through twelve named failure vectors and writes the post-mortem of the failure that hasn't happened. Produces a premortem: the death narrative, the twelve-vector attack with survival verdicts, the three kill-shots most likely to land, and the cheap tripwires that would give early warning.

Who uses this skill

The Premortem Assassin 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 174,000+ 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/premortem-assassin
curl -L https://claudskills.com/skills/premortem-assassin/SKILL.md \
  -o ~/.claude/skills/premortem-assassin/SKILL.md

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

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

📱 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 Premortem Assassin Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/premortem-assassin/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Premortem Assassin skill do?

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 Premortem Assassin skill?

Use Premortem Assassin when your Claude Code task falls under the Security category — specifically in the security misc 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 Premortem Assassin" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Premortem Assassin 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. Premortem Assassin 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

Source: https://github.com/mohitagw15856/pm-claude-skills/blob/HEAD/plugins/pm-warroom/skills/premortem-assassin/SKILL.md
License: MIT
Author: mohitagw15856
Website: https://mohitagw15856.github.io/pm-claude-skills/

Cite this skill

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

APA

mohitagw15856. (2026). Premortem Assassin [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/premortem-assassin/

BibTeX

@misc{premortem-assassin-2026,
  author    = {mohitagw15856},
  title     = {Premortem Assassin [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/premortem-assassin/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/premortem-assassin.svg)](https://claudskills.com/skills/premortem-assassin/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade A · scanned 2026-08-02 — 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 ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

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

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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