Overview
andreessen is an open-source integrations skill for Claude Code and compatible agents, published by alirezarezvani. Its author describes it as: “Marc Andreessen-mode decision and productivity skill. A blunt, market-first operator that pressure-tests ideas, ventures, features, and career bets through Andreessen's actual frameworks — market dominates team and pr…”. The project has 25k stars on GitHub and is available under the MIT license. Add it to your setup with `/plugin marketplace add alirezarezvani/claude-skills`.
What andreessen does
> **Portability:** Reasoning-led skill with 3 stdlib Python tools. No external APIs, no LLM calls in > scripts. Works in Claude Code CLI and Claude.ai web. The voice is the product.
What’s inside
The SKILL.md for andreessen is organised into these sections:
- The Operating Prompt (non-negotiable voice)
- The Andreessen Lens (what the skill actually believes)
- Workflow
- 1. Detect the question type and route
- 2. Run the forcing-question interrogation (for any substantive bet)
- 3. Use the tools to make verdicts deterministic
- 4. Deliver the verdict in the operating voice
- Tooling
- References
- Assets
- Hard Rules
- Anti-Patterns To Reject
Installation
Add andreessen to your agent with:
/plugin marketplace add alirezarezvani/claude-skillsReview a skill’s source before installing it — skills can instruct your agent to run commands. This command comes from the skill’s public repository, which is the source of truth for setup steps. New to skills? Read how to install Claude Code skills.
Supported agents
- Claude Code — ships a claude code plugin marketplace
- Codex — declared in the repository topics
- Cursor — declared in the repository topics
- Gemini CLI — declared in the repository topics
License
andreessen is published under the MIT license.
Strengths
- Clear MIT license — safe to read and adapt within its terms
- Ships in alirezarezvani/claude-skills, an established project with 24,617 GitHub stars
- Works with Claude Code, Codex, Cursor, Gemini CLI
- Actively maintained — repository updated in the last 90 days
Author
Topics
Frequently asked questions
- What does andreessen do?
- Marc Andreessen-mode decision and productivity skill. A blunt, market-first operator that pressure-tests ideas, ventures, features, and career bets through Andreessen's actual frameworks — market dominates team and product; the only milestone that matters is product/market fit; bias to build over deliberate. Use when the user says 'andreessen', 'pmarca mode', 'should I build this', 'is there a market', 'are we at product/market fit', 'pmf check', 'pressure-test this idea', 'be brutal about this venture', 'market-first take', or wants a no-disclaimers, no-hedging, confidence-leveled verdict on whether something is worth pursuing. Also provides the 3x5-card + Anti-Todo personal productivity routine. Runs on a fixed anti-sycophancy operating prompt: leads with the strongest counterargument, never validates premises, uses explicit confidence levels, never apologizes for disagreeing. Not for polite brainstorming — this skill exists to tell you the market is dead when it is.
- How do I install andreessen?
- Run /plugin marketplace add alirezarezvani/claude-skills in your agent, then reload your skills. Review the source at https://github.com/alirezarezvani/claude-skills before installing.
- Is andreessen free to use?
- Yes. andreessen is free and open source under the MIT license, so you can read, run, and adapt it within that license's terms.
- Which agents does andreessen work with?
- andreessen lists Claude Code, Codex, Cursor, and Gemini CLI — named in its SKILL.md, its plugin marketplace or its repository topics. Skills use the portable SKILL.md format, so other agents that read that format may load it too.
- Where does andreessen come from?
- andreessen ships inside alirezarezvani/claude-skills, a repository that contains 41 catalogued skills in total. The repository's 24,617 GitHub stars apply to that whole collection, not to this skill on its own.