Official updates for developers building with @ClaudeAI
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A few of you asked what mods are, here's a quick walkthrough! They’re really just plugins with a few special functions that let your code run inside Claude Code, like middleware.
(don't worry, you can just ask Claude to write them for you 😛)
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We're adding a new plugin to Claude Code: You should Know.
It scans Claude's output for important information you might miss to help keep you in the loop.
Enable it with:
/plugin enable cc-plugin-you-should-know@builtin
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"You should know" is a mod that works by spinning off a sideagent to observe Claude's output.
Read more about mods in our newest blog post: claude.dev/blog/getting-star…
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You can now mod Claude Code:
- Change how it behaves
- Customize the UI
- Swap in your own features
Write one with a few lines of TypeScript, or have Claude build it for you. Mods ship inside plugins, so you install them with /plugin in the CLI or desktop app.
A few examples:
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We're adding pre-built sample mods to the Claude Code Playground repo you can riff off of, if you need some inspiration.
Learn more in our getting started guide: claude.dev/blog/getting-star…
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We’ve used mods to build features like /diff and AGENTS.md support. We hope you find them as useful (and fun) as we do, and can't wait to see what you build!
claude.com/blog/claude-code-…
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Claude.dev is our new home for developers building with Claude.
You'll find engineering deep dives, Claude Code and API guides, tips from the teams building Claude, and some fun easter eggs.
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Claude Sonnet 5.5 is out! We wrote a guide for building with it:
• choosing between Sonnet 5.5 and Opus 5.5
• migrating from Sonnet 5 and tuning effort
• using it in Claude Code
claude.dev/blog/building-wit…
Community note
The reference photograph shown in this video was originally posted by @IceSolst. The photographer stated it was used without credit or permission.
x.com/IceSolst/statu… x.com/IceSolst/statu…
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Claude can now help you build evaluations and hillclimb on them.
In this article, we share guidance on eval design & skills that Claude Code can use to improve your applications.
claude.dev/blog/automating-e…
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Sonnet 5.5 is smarter, more efficient, and 30% faster than Sonnet 5. It costs up to 30% less for most work, so your Claude Code usage goes further too.
Use it for well-scoped everyday tasks like fixing bugs and quickly iterating on features.
Introducing Claude Sonnet 5.5, the second model in the Claude 5.5 family.
It’s a clear upgrade over Sonnet 5, runs more than 30% faster, and costs up to 30% less for most work.
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We’re extending preserved thinking with Sonnet 5.5 to curb distillation attacks via account-switching. Thinking stays in the original org that generated it, so if you switch accounts mid-session, Claude will reread the session and generate new thinking. platform.claude.com/docs/en/…
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Sonnet 5.5 is available now in the Claude Platform and Claude Code.
We granted all Pro, Max, and Team users a reset last Tuesday. If you haven’t used it yet, you can still apply it whenever you want, before Oct 22. clau.de/reset
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What is effort really? When do you change it it and why not just use max effort for everything?
I dove deep into this problem, looking into evals and doing my own tests and I was quite surprised by the results.
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It’s now easier to build plugins for Claude.
We built a new portal to submit your plugin, track review, and see usage.
Plugins package MCP and skills, and are becoming the way to build for Claude. MCP usage across Claude products is up 110x this year!
claude.com/blog/build-plugin…
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Plugins are the main way for third-party developers to create extensions for Claude. Over the coming weeks, one discovery experience will roll out across Claude and Claude Code.
Read the blog to learn more: claude.com/blog/build-plugin…
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Go build plugins for Claude!
claude.com/docs/build/overvi…
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