Is the Swing Mortem skill free?

Yes. The skill itself is free from TheStack-ai/swing-skills. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Swing Mortem SkillProof Score?

9.6/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 5/5.

How do I install Swing Mortem?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Swing Mortem with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Swing Mortem

Forces a Gary Klein pre-mortem: assume total failure, then find quantified risks and escape hatches.

by TheStack-ai · TheStack-ai/swing-skills

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.6/10
Tested: Jul 14, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · d8fa8c7

Ran a real pre-mortem on this very testing batch and it correctly flagged the GitHub API rate-limit error we'd hit minutes earlier in-session as a quantified Technical failure scenario — the un-skilled baseline could only produce 'might have scaling issues' style generic bullets with no numbers or thresholds at all.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 9/10
Docs & honesty 5/5

What Swing Mortem does

Runs a structured 6-phase pre-mortem on a plan, architecture, or launch: generates exactly 5 specific failure scenarios (technical, organizational, external, temporal, assumption), ranks them on a likelihood x impact matrix, and defines measurable leading indicators and circuit-breaker triggers for the top 3. Triggers on risk-analysis phrasing in English and Korean ('what could go wrong', '리스크 분석'); explicitly hands off to sibling skills for current-state review or option generation.

How to install Swing Mortem

git clone https://github.com/TheStack-ai/swing-skills
cd swing-skills
mkdir -p ~/.claude/skills
cp -r skills/swing-mortem ~/.claude/skills/swing-mortem

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Swing Mortem

/swing-mortem Forces a Gary Klein pre-mortem: assume total failure, then find quantified risks and escape hatches.

It also activates on plain-language prompts like these:

Before we commit to this migration plan, what could go wrong?
Do a pre-mortem on our Q3 launch plan with quantified risks.
Assume this rollout totally failed, what are the top risk scenarios?

Frequently asked questions

Is the Swing Mortem skill free?: Yes. The skill itself is free from TheStack-ai/swing-skills. SkillProof publishes the install command and an independent test verdict at no cost.
Does Swing Mortem work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 14, 2026. Verdict: Tested · Works. Ran a real pre-mortem on this very testing batch and it correctly flagged the GitHub API rate-limit error we'd hit minutes earlier in-session as a quantified Technical failure scenario — the un-skilled baseline could only produce 'might have scaling issues' style generic bullets with no numbers or thresholds at all.
What is the Swing Mortem SkillProof Score?: 9.6/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 5/5.
How do I install Swing Mortem?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Swing Mortem with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.