Best use case
challenge is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
/em -challenge — Pre-Mortem Plan Analysis
Teams using challenge should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/challenge/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How challenge Compares
| Feature / Agent | challenge | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
/em -challenge — Pre-Mortem Plan Analysis
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
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SKILL.md Source
# /em:challenge — Pre-Mortem Plan Analysis **Command:** `/em:challenge <plan>` Systematically finds weaknesses in any plan before reality does. Not to kill the plan — to make it survive contact with reality. --- ## The Core Idea Most plans fail for predictable reasons. Not bad luck — bad assumptions. Overestimated demand. Underestimated complexity. Dependencies nobody questioned. Timing that made sense in a spreadsheet but not in the real world. The pre-mortem technique: **imagine it's 12 months from now and this plan failed spectacularly. Now work backwards. Why?** That's not pessimism. It's how you build something that doesn't collapse. --- ## When to Run a Challenge - Before committing significant resources to a plan - Before presenting to the board or investors - When you notice you're only hearing positive feedback about the plan - When the plan requires multiple external dependencies to align - When there's pressure to move fast and "figure it out later" - When you feel excited about the plan (excitement is a signal to scrutinize harder) --- ## The Challenge Framework ### Step 1: Extract Core Assumptions Before you can test a plan, you need to surface everything it assumes to be true. For each section of the plan, ask: - What has to be true for this to work? - What are we assuming about customer behavior? - What are we assuming about competitor response? - What are we assuming about our own execution capability? - What external factors does this depend on? **Common assumption categories:** - **Market assumptions** — size, growth rate, customer willingness to pay, buying cycle - **Execution assumptions** — team capacity, velocity, no major hires needed - **Customer assumptions** — they have the problem, they know they have it, they'll pay to solve it - **Competitive assumptions** — incumbents won't respond, no new entrant, moat holds - **Financial assumptions** — burn rate, revenue timing, CAC, LTV ratios - **Dependency assumptions** — partner will deliver, API won't change, regulations won't shift ### Step 2: Rate Each Assumption For every assumption extracted, rate it on two dimensions: **Confidence level (how sure are you this is true):** - **High** — verified with data, customer conversations, market research - **Medium** — directionally right but not validated - **Low** — plausible but untested - **Unknown** — we simply don't know **Impact if wrong (what happens if this assumption fails):** - **Critical** — plan fails entirely - **High** — major delay or cost overrun - **Medium** — significant rework required - **Low** — manageable adjustment ### Step 3: Map Vulnerabilities The matrix of Low/Unknown confidence × Critical/High impact = your highest-risk assumptions. **Vulnerability = Low confidence + High impact** These are not problems to ignore. They're the bets you're making. The question is: are you making them consciously? ### Step 4: Find the Dependency Chain Many plans fail not because any single assumption is wrong, but because multiple assumptions have to be right simultaneously. Map the chain: - Does assumption B depend on assumption A being true first? - If the first thing goes wrong, how many downstream things break? - What's the critical path? What has zero slack? ### Step 5: Test the Reversibility For each critical vulnerability: if this assumption turns out to be wrong at month 3, what do you do? - Can you pivot? - Can you cut scope? - Is money already spent? - Are commitments already made? The less reversible, the more rigorously you need to validate before committing. --- ## Output Format **Challenge Report: [Plan Name]** ``` CORE ASSUMPTIONS (extracted) 1. [Assumption] — Confidence: [H/M/L/?] — Impact if wrong: [Critical/High/Medium/Low] 2. ... VULNERABILITY MAP Critical risks (act before proceeding): • [#N] [Assumption] — WHY it might be wrong — WHAT breaks if it is High risks (validate before scaling): • ... DEPENDENCY CHAIN [Assumption A] → depends on → [Assumption B] → which enables → [Assumption C] Weakest link: [X] — if this breaks, [Y] and [Z] also fail REVERSIBILITY ASSESSMENT • Reversible bets: [list] • Irreversible commitments: [list — treat with extreme care] KILL SWITCHES What would have to be true at [30/60/90 days] to continue vs. kill/pivot? • Continue if: ... • Kill/pivot if: ... HARDENING ACTIONS 1. [Specific validation to do before proceeding] 2. [Alternative approach to consider] 3. [Contingency to build into the plan] ``` --- ## Challenge Patterns by Plan Type ### Product Roadmap - Are we building what customers will pay for, or what they said they wanted? - Does the velocity estimate account for real team capacity (not theoretical)? - What happens if the anchor feature takes 3× longer than estimated? - Who owns decisions when requirements conflict? ### Go-to-Market Plan - What's the actual ICP conversion rate, not the hoped-for one? - How many touches to close, and do you have the sales capacity for that? - What happens if the first 10 deals take 3 months instead of 1? - Is "land and expand" a real motion or a hope? ### Hiring Plan - What happens if the key hire takes 4 months to find, not 6 weeks? - Is the plan dependent on retaining specific people who might leave? - Does the plan account for ramp time (usually 3–6 months before full productivity)? - What's the burn impact if headcount leads revenue by 6 months? ### Fundraising Plan - What's your fallback if the lead investor passes? - Have you modeled the timeline if it takes 6 months, not 3? - What's your runway at current burn if the round closes at the low end? - What assumptions break if you raise 50% of the target amount? --- ## The Hardest Questions These are the ones people skip: - "What's the bear case, not the base case?" - "If this exact plan was run by a team we don't trust, would it work?" - "What are we not saying out loud because it's uncomfortable?" - "Who has incentives to make this plan sound better than it is?" - "What would an enemy of this plan attack first?" --- ## Deliverable The output of `/em:challenge` is not permission to stop. It's a vulnerability map. Now you can make conscious decisions: validate the risky assumptions, hedge the critical ones, or accept the bets you're making knowingly. Unknown risks are dangerous. Known risks are manageable.
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