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Andreessen Mode — Market-First Decision & Productivity

A blunt Marc Andreessen persona that pressure-tests ideas, ventures, features, and career bets and ends every run with a BUILD/DERISK/KILL verdict plus confidence level.

UtilitiesIntermediate★ 24,151⑂ 3,405AI score 8/10Last updated: Aug 9, 2026

What it does

Turns Claude into a market-obsessed operator modeled on Marc Andreessen (a16z).

  • Anti-sycophancy operating prompt: leads with the strongest counterargument to your position, bans premise validation, disclaimers, and unresolved "it depends," and attaches high/moderate/low/unknown confidence to every substantive claim.
  • Three load-bearing convictions: market > team > product; the only milestone that matters is product/market fit; bias to build over further study.
  • Six forcing questions, asked one at a time: what exactly is the market and is it pulling, why now, before or after PMF and which single signal proves it, what you're willing to change, where the software leverage compounds, and the cheapest experiment that tests the riskiest assumption this week.
  • Three deterministic scripts: market_first_evaluator.py (market weighted 0.55, sub-4 market is a hard kill gate), pmf_signal_scorer.py (Sean Ellis 40% gate plus four qualitative signals), and anti_todo_card.py (3x5 card capped at 3–5 must-dos with an Anti-Todo log).
  • Output is a verdict, not a survey: BUILD-POUR-FUEL / MARKET-FIRST-DERISK / KILL-OR-REPICK-MARKET.

Who it's for

  • Founders who want an idea attacked before they commit years to it
  • PMs and growth leads deciding whether a feature or bet deserves resources
  • Anyone facing a big career bet who wants unvarnished feedback
  • People who want a hard 3–5 item daily focus routine

Examples

  1. Idea pressure test: "andreessen mode — be brutal about this B2B SaaS idea" → counterargument first → six questions in sequence → market scoring → KILL-OR-REPICK-MARKET with defended reasoning.
  2. PMF check: "pmf check, our Sean Ellis score is 45%" → 40% gate plus retention/organic/demand signals → APPROACHING-PMF verdict and the next experiment to run.
  3. Daily planning: "what should I focus on today?" → 3x5 card front capped at five must-dos (a sixth is rejected) and an Anti-Todo log on the back for what actually got done.

· · · Install guide · · ·

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the .gemini/skills/andreessen folder from the GitHub repo alirezarezvani/claude-skills into my ~/.claude/skills/andreessen/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/alirezarezvani/claude-skills.git && mkdir -p ~/.claude/skills && cp -r claude-skills/.gemini/skills/andreessen ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open your terminal (Terminal on macOS/Linux, Git Bash on Windows).
  2. Clone the repository: git clone https://github.com/alirezarezvani/claude-skills.git
  3. Make sure the skills folder exists: mkdir -p ~/.claude/skills
  4. Copy just this skill: cp -r claude-skills/.gemini/skills/andreessen ~/.claude/skills/
  5. Verify with ls ~/.claude/skills/andreessen — you should see SKILL.md, scripts/, references/, and assets/.
  6. Restart Claude Code, then trigger it with a phrase like "andreessen mode: should I build this?" or "pmf check".
  7. The scripts use only the Python standard library, so no extra packages are needed — just confirm Python exists with python3 --version.
View source on GitHub ↗License: MIT