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Anthropic launched two new features for Claude recently but forgot to provide any documentation, so I reverse-engineered them from the system prompt and wrote about what they can do and how they work simonwillison.net/2025/Jul/31/...

simonwillison.netReverse engineering some updates to ClaudeAnthropic released two major new features for their consumer-facing Claude apps in the past couple of days. Sadly, they don’t do a very good job of updating the release notes …

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For calendar events on my Pixel I would share my screen with Gemini and say "add to calendar." It either works perfectly or I get "As a Large Language Model I cannot directly add Calendar events, however you can do it yourself by..."

I don’t know if this is universal but they seem to have silently updated an alert deployed Artifact of mine to use this API. Not mad, just found it neat!