Tool use lets Claude call functions you define in your API request. MCP goes further — it lets Claude connect to external servers that provide tools, data, and prompts. MCP is the bridge between Claude and the rest of your infrastructure. This is Article 13 in the Claude AI — From Zero to Power User series. You should have completed Article 8: Tool Use before this article. By the end of this article, you will understand MCP architecture, use pre-built MCP servers, and build your own MCP server in both Python and TypeScript. ...
5 Biggest AI Stories: Week of Apr 13-19, 2026
Here are the 5 biggest AI stories from the week of April 13–19, 2026. 1. Anthropic: Claude Opus 4.7 Anthropic released Claude Opus 4.7 this week. The headline numbers: 3× more production bugs fixed on SWE-bench compared to the previous model 98.5% on vision tasks — near-perfect image understanding New /ultrareview command in Claude Code for deeper code analysis The catch: Opus 4.7 uses a new tokenizer that adds up to 35% more tokens on code-heavy tasks, which increases cost even though the per-token price stayed the same. If you work with a lot of code, run the math on your current usage before upgrading. ...
Android CLI: Build Android Apps 3x Faster With Any AI Agent
Google announced a new tool for Android developers: Android CLI. It works with any AI agent — Claude Code, Gemini CLI, Codex, or others. It makes AI-assisted Android development 3x faster and cuts LLM token usage by 70%. In this article I’ll explain what Android CLI is, what commands it has, and how to get started. What Is Android CLI? Android CLI is a command-line tool built for AI agents. ...
Claude AI Tutorial #12: Extended Thinking — Claude's Reasoning Mode
Some problems need thinking. A complex debugging task, a math proof, or a multi-step architecture decision — these benefit from Claude reasoning through the problem before answering. Extended thinking makes this explicit and controllable. This is Article 12 in the Claude AI — From Zero to Power User series. You should have completed Article 7: Messages API before this article. By the end of this article, you will know how to enable extended thinking, set thinking budgets, and decide when to use it. ...
The Vibe Coding Security Bill Is Coming Due
In February 2025, Andrej Karpathy posted on X: “There’s a new kind of coding I call ‘vibe coding’, where you fully give in to the vibes, embrace exponentials, and forget that the code even exists.” By March 2026, the bill arrived. The CVE Spike Researchers at Georgia Tech track a metric called the Vibe Security Radar. It counts CVEs formally attributed to AI-generated code. Here is what they found in Q1 2026: ...
Claude Design: Anthropic's New Tool That Turns a Prompt Into Slides and Prototypes
Anthropic launched a new tool today called Claude Design. It is part of Anthropic Labs — a new sub-brand for experimental products built on Claude. The idea is simple: you describe what you want in plain language, and Claude builds it as a visual artifact — a slide deck, a prototype, a one-pager, or a general design. What Claude Design Does You open Claude Design and type what you need. Something like: “Make a pricing page with three tiers” or “Build a product overview slide deck for a SaaS company.” ...
Claude Code Routines: Let Claude Work While Your Mac Is Off
Anthropic launched a new Claude Code feature on April 14, 2026: Routines. A Routine is a Claude Code automation that runs in Anthropic’s cloud. You set it up once. Then it runs on a schedule, on an API call, or when a GitHub event fires — with your Mac completely off. What Is a Routine? A Routine packages three things together: ...
OpenCode vs Claude Code vs Codex: The AI Agent War Nobody Planned
In January 2026, Anthropic made a quiet change. They blocked Claude Pro and Max subscribers from using Claude through third-party tools. No announcement. No warning. Tools like OpenCode just stopped working overnight. The backlash was immediate. David Heinemeier Hansson — the creator of Ruby on Rails — posted on X: “Confirmation that Anthropic is intentionally blocking OpenCode, and any other 3P harness, in a paranoid attempt to force devs into Claude Code. Terrible policy for a company built on training models on our code, our writing, our everything.” ...
Claude AI Tutorial #11: Prompt Caching — Save Money on Repeated Context
Every time you call the Claude API with the same system prompt, you pay full price for those input tokens. Prompt caching fixes this. Cache your repeated context once, then pay only 10% on every subsequent call. This is Article 11 in the Claude AI — From Zero to Power User series. You should have completed Article 7: Messages API before this article. By the end of this article, you will know how prompt caching works, when it pays off, and how to implement it in your applications. ...
Claude Opus 4.7: The Upgrade Developers Actually Wanted
Anthropic released Claude Opus 4.7 on April 16, 2026. Same price as 4.6. But three times more production bugs resolved on the benchmark that matters most to developers. Here is everything that changed — and the one real catch. The 3x Claim: What It Actually Means The “3x” number comes from SWE-bench Verified, specifically the Rakuten production bug subset. SWE-bench is the standard benchmark for AI coding. It gives a model real GitHub issues from real open-source projects. The model has to produce a working fix — not a suggestion, not a comment. A fix. ...