it's basically impossible for someone to just "show you their prompt" now, because everything is about references, skills and examples I often ask my agent to look at 3 other repos I've made first, search the web for references, use other AI APIs, etc.↗

Using Claude Code: Spending your effort One of the best parts of our newest Claude models is how they respond to effort without breaking the prompt cache in Claude Code, but I’ve received a lot of questions on this from users. What is effort really and when do you use which effo…↗

we’re thinking of killing plan mode and using the shift+tab hotkey to adjust effort levels I don’t think the models need plan mode anymore, but if you’re a plan mode diehard would love to get your feedback on why↗

I asked Opus 5.5 to try a bunch of redesigns of my personal website using my MAX sub, using workflows to iterate and critique. I was really pleased with how it hit the tone I was looking for. Then I asked it to make a trailer with all of its iterations.↗

I now type "use big pictures and few words" several times a day↗

We're adding support for AGENTS.md to Claude Code. Starting today in version 2.1.277, if there is no CLAUDE.md in a folder, Claude will check for and use AGENTS.md. You can toggle this behavior in /config.↗

I talked to Sid & Robert about building Claude Code: how much things have changed, how hard it's been to keep up with model capabilities and also what we miss about software engineering before AI. youtube.com/watch?v=S-sYlF…↗

@jxnlco we do that once a year already↗

a skill people at Anthropic have been using a lot recently: ELI5 /eli5 <what you want explained> "explain like I'm someone who knows nothing about this topic, using a HTML artifact with big pictures and few words"↗

weird that there's a "make a lot of money" button and nobody's pressing it (take your SaaS, make it headless, let agents use it, charge per interaction esp for enterprises)↗

This is part of working with the EU AI Act, other labs are adding similar watermarking. It’s hard to identify AI-generated text, and this gives people better tools to do that. We’ll also be a shipping text detection API that you can use yourself.↗

The new rules of context engineering for Claude 5 models I’ve written previously about how to best [prompt the newest generation of Claude 5 models](x.com/trq212/status/2073100352921215386) and work with them iteratively to discover what you want to build. But when you send a m…↗

ideal prompting technique is: - thin prompts - thick artifacts + context - thin skills↗

Live tweeting video editing of my AIE talk. Swyx sent me 4 videos that are about 60GB, I also threw in my HTML deck. This is my starting prompt.↗

my keynote at AI Engineer World Fair: “A Field Guide to Fable” is live on YouTube! youtu.be/9fubhllmsBU?is…↗

A Field Guide to Fable: Finding Your Unknowns Working with Claude Fable 5 keeps re-teaching me an old lesson: the map is not the territory. The map, a representation of the work to be done, is my prompts and skills and context, it’s what I give Claude. The territory is where th…↗

Lots of people asked how I used Fable to edit its own launch video so I made a video about that! TLDR it wrote a lot of code & tool calls to use transcription services, ffmpeg, do colorgrading, use the figma mcp, make remotion UI and render it. I didn't touch a video editor.↗

A harness for every task: dynamic workflows in Claude Code Last week, we released [dynamic workflows](code.claude.com/docs/en/workflows) in Claude Code. Claude can now write its own [harness](code.claude.com/docs/en/glossary#agentic-harness) on the fly, custom-built for the task…↗

been asking others at Anthropic how they stay in the loop with Claude and fully understand the work being done this is one of my favorites from Suzanne:↗

the basic trick to using Claude Code for non-technical work is to put a bunch of files in a folder and tell it can write scripts + make HTML↗

okay this is going kinda viral and tbh my original text was kind of messy, so here's a second pass with the help of Claude: -- Implement <SPEC>. As you work maintain a running implementation-notes.html file that captures anything I should know about how the implementation diverg…↗

a prompt I've been using a lot recently: implement <SPEC> and while you do, keep a running implementation-notes.html file (or markdown) with decisions you had to make weren't in the spec, things you had to change, tradeoffs you had to make or anything else I should know↗

Using Claude Code: The Unreasonable Effectiveness of HTML This is now also on the [Claude Blog](claude.com/blog/using-claude-code-the-unreasonable-effectiveness-of-html). Markdown has become the dominant file format used by agents to communicate with us. It’s simple, portable,…↗

x.com/i/article/2044…↗

New in Claude Code: /ultraplan Claude builds an implementation plan for you on the web. You can read it and edit it, then run the plan on the web or back in your terminal. Available now in preview for all users with CC on the web enabled.↗

@jyothiwrites yeah I dont think of prompting as "saying the right magic words", but I think of it as communicating clearly with the agent and there is a huge skill ceiling there↗

I want to do some streams where I work with non-technical people using Claude Code to figure out how they might be able to improve their process. My feeling is that just a few tips could make a big difference in efficiency. Any mutuals interested?↗

/buddy↗

read the docs here: github.com/anthropics/cla…↗

Lessons from Building Claude Code: Prompt Caching Is Everything It is often said in engineering that "Cache Rules Everything Around Me", and the same rule holds for agents. Long running agentic products like Claude Code are made feasible by prompt caching which allows us to reu…↗