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Prompting & Context Engineering

Claude Fable 5 is free for 4 more days. Here is the full guide
Anthropic’s strongest model ever is included in paid plans until July 12. The best practices, the copy-paste prompts, and the two patterns that keep…
 • Ruben Dominguez
Your AI bill is mostly wasted tokens
The 4-layer system that cuts it 50 to 90%, with the copy-paste setup
 • Ruben Dominguez
The head of Claude Code stopped prompting Claude. Most builders missed why
Loop engineering, the five blocks Claude Code and Codex both ship in 2026, copy-paste /goal conditions and SKILL.md, the maker-checker split, and the…
 • Ruben Dominguez
You are still chaining prompts. Anthropic's engineers stopped a month ago
The 6 patterns and 14 steps the frontier company actually uses to migrate code, sort 1,000 items, and verify agents at scale
 • Ruben Dominguez
Your AI agent is going to hallucinate at scale
The bigger the memory, the worse it gets. The 6 architectures that fix it, the 12 prompts that constrain Claude into structured output, and the 30-day…
 • Ruben Dominguez
I built a $0 second brain that compounds for life
Obsidian has 2,700+ plugins. The CEO just shipped official Claude Skills with 12,900 GitHub stars. The integration is the personal AI moat nobody is…
 • Ruben Dominguez
Your voice is the only AI moat that compounds. Here is how to clone it into Claude in a weekend
The model is the commodity. Your voice is the asset. A 4,000-token file is the only defense that gets stronger as AI gets cheaper
 • Ruben Dominguez
Build your own stock analyst with Claude
The 12-prompt system that replaces a $250K Bloomberg terminal and a $1,500/month research subscription. For $20/month. Built for operators who manage…
 • Ruben Dominguez
The AI code review checklist that prevents the next $1M production incident
8 documented disasters. 7 failure modes. 3 review tiers. 12 self-review prompts. Built for engineers shipping AI code in 2026.
 • Ruben Dominguez
The 5-agent sales team you can build this weekend
$60K-per-year SDRs are getting laid off. $5K-per-month AI SDR tools are getting canceled at 70% churn. The founders winning right now built 5…
 • Ruben Dominguez
The AI agent that thinks like Jensen Huang, Elon Musk, and Dario Amodei
Full system prompts for Claude, ChatGPT, and OpenClaw. The mental models of the best founders in the world, encoded into a thinking partner you can text…
 • Ruben Dominguez
25 Claude Skills that give your startup a marketing team it cannot afford yet
Copy-paste prompts for every workflow your team repeats. Content. Email. SEO. Paid. CRO. Research. Launch. Install once. Run forever.
 • Ruben Dominguez
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