We removed ~80% of the Claude Code system prompt for our newest models, this is what we've learned about writing system prompts, skills and Claude.MDs for them. http://x.com/i/article/2080703729385512960

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 and work with them iteratively to discover what you want to build. But when you send a message to Claude, the

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Opus 5 is live in Claude Code and the Claude Platform today. A few things worth knowing: 🧵 https://x.com/claudeai/status/2080699495453528290?s=20

Retweeted by ClaudeDevs [UNOFFICIAL]@claudedevs-mir-rt.selfhosted.social · 2w ago

RT @claudeai: Introducing Claude Opus 5. It's a thoughtful and proactive model that comes close to the frontier intelligence of Fable 5 at half the price.

We've just added several new features to Claude Managed Agents. You can now configure effort levels per agent, seed sessions with events, add up to 500 skills per session, use webhooks for environments + memory stores, and stream events for sub-agents.

Claude Code on desktop now works with the iOS simulator. Build and run your iOS app, and the simulator opens in a panel right next to your conversation. Available today in public beta.

http://x.com/i/article/2077886850262503424

How Anthropic runs large-scale code migrations with Claude Code

Code migrations, projects that port a production codebase to a new language, were multi-year endeavors until recently. In the last month, individual developers at Anthropic migrated 10 code packages

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if you've run into this, please restart Claude Code, fix should be propogating

Retweeted by Thariq [UNOFFICIAL]@trq212-mir-rt.selfhosted.social · 2w ago

RT @thereturningdev: I missed the memo? do Fable 5 runs on credit only from... now? I have the Max 5x plan

We're also keeping Claude Code weekly limits 50% higher, now through August 19, for all Pro, Max, Team, and seat-based Enterprise users.

Retweeted by ClaudeDevs [UNOFFICIAL]@claudedevs-mir-rt.selfhosted.social · 3w ago

RT @claudeai: Beginning July 20, Claude Fable 5 will be included in all Max and Team Premium plans, at 50% of limits. Pro and Team Standard users will continue to have access to Fable via usage credits, and will receive a one-time $100 credit.

Claude Code's /code-review now has effort levels, with the review rewritten at every one. Low effort beats other code review tools on findings at a fraction of the token cost. High effort delivers significantly higher recall when you want to go deeper. You pick the tradeoff.

We've reset 5-hour and weekly rate limits for all users.

RT @claudeai: We're extending Claude Fable 5 access on all paid plans, as well as keeping Claude Code’s weekly rate limits 50% higher, through July 19.

We've reset 5-hour and weekly rate limits for all users.

http://x.com/i/article/2074606120292020224

Model and effort in Claude Code: knowing more vs. trying harder

Claude Code gives you two settings that both seem to "make the answer better": the model, and the effort level. But what do these actually do to the output? And how do you know whether to reach for a

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RT @claudeai: We're extending access to Claude Fable 5 on all paid plans through July 12.

RT @claudeai: We've put together a short history of how Claude Code came to be, told by the people who built it and the early users who helped make it what it is today. https://www.anthropic.com/features/making-of-claude-code

http://x.com/i/article/2074204645845839872

Getting started with loops

There’s a lot of talk right now about "designing loops" instead of prompting your coding agent. If you spend some time on X trying to pin down what a loop actually is, you'll come across multiple

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http://x.com/i/article/2073090223194755072

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

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/radio 🍓☀️

We've raised Claude Platform API rate limits for all users and simplified the tiers, which are no longer based on API spend. The latest Sonnet and Haiku models now provide 5x higher rate limits at the highest tier.

RT @claudeai: Announcing Built with Claude: Life Sciences, a global virtual hackathon. Join us and @GladstoneInst for a week of researching and building with Claude Science and Claude Code, with a prize pool of $100k in credits.

Now that Fable 5 is ready to build (again), we've reset everyone's 5-hour and weekly rate limits.

RT @claudeai: Following conversations with the US government, we’ve updated our cybersecurity safeguards. The vast majority of coding work is unaffected.

RT @claudeai: Fable 5 is back.

We’ve added a few updates to Claude Managed Agents: Streaming session event deltas, per-session agent overrides, new webhook event types, reverse pagination, and credential injection scoping.

Claude Desktop is now available on Linux (Ubuntu and Debian) in beta. Alongside the browser and terminal, you now get a first-class desktop experience with Claude Code, Claude Cowork, and chat on all paid plans.

You can now run Claude models in Microsoft Foundry, hosted on Azure. Claude Opus 4.8 and Claude Haiku 4.5 are available through the Messages API with capabilities like prompt caching, thinking, and more. https://x.com/claudeai/status/2071653958905467027?s=20

Retweeted by ClaudeDevs [UNOFFICIAL]@claudedevs-mir-rt.selfhosted.social · last mo.

RT @claudeai: Claude in Microsoft Foundry is now generally available, hosted on Azure. Azure customers get Claude Opus 4.8 and Claude Haiku 4.5, with Azure authentication, billing, and commitment retirement.

Claude Tag is the next evolution of agents. It's a proactive, multiplayer agent with memory and identity, built on top of Claude Code. Learn more about how Claude Tag works and best practices for using it in this deep dive. https://x.com/claudedevs/status/2070235730295865661

The Japan Claude Community Ambassador program is here! 🇯🇵 Ambassadors have hosted 290+ meetups in 107 cities across 37 countries, with 40,000+ attendees building together. Now open from Hokkaido to Okinawa. 日本の皆さん、ぜひご応募ください！ https://claude.com/ja/community/ambassadors

Claude コミュニティ アンバサダー | Claude by Anthropic

あなたの街で Claude のコミュニティを構築し、主導しましょう。アンバサダーはイベントを主催し、地元のビルダーとつながり、Anthropic と協力して Claude の未来を形作ります。

claude.com

Update: we've gone ahead and reset 5-hour and weekly usage limits for everyone, across all plans. Enjoy your weekend!

ClaudeDevs [UNOFFICIAL]@claudedevs-mirr.selfhosted.social · 2mo ago

Earlier today, ~3% of Claude Code Max and Pro users hit a bug that showed an incorrect weekly usage limit, and in some cases blocked them from sending messages. This is fixed, and we're resetting 5-hour and weekly limits for everyone affected. Apologies for the disruption.

Earlier today, ~3% of Claude Code Max and Pro users hit a bug that showed an incorrect weekly usage limit, and in some cases blocked them from sending messages. This is fixed, and we're resetting 5-hour and weekly limits for everyone affected. Apologies for the disruption.

Artifacts are now live in Claude Code. Ask Claude to turn what it's working on into a page and send the link to your team. The page updates as the session keeps working. Available today on Team and Enterprise plans.

Retweeted by ClaudeDevs [UNOFFICIAL]@claudedevs-mir-rt.selfhosted.social · 2mo ago

RT @claudeai: New in Claude Code: Artifacts. Interactive pages built from your session, like a PR walkthrough or a living project dashboard, shared with your team at a private link. Available in beta on Team and Enterprise plans.