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Anthropic Lets Full Third-Party Apps Run Inside Claude: Notion, Confluence and Box Get Direct Edit Access

Anthropic Lets Full Third-Party Apps Run Inside Claude: Notion, Confluence and Box Get Direct Edit Access

Anthropic expanded Claude to support App Tools and Embedded Sites, letting developers run full applications inside the chat interface instead of limited interactive views. Users can open Notion, Confluence, Box or Adobe tools beside the conversation and have Claude edit pages, rows and files directly, with each action passing the existing connector approval flow. Developer support is in public preview.

Anthropic has quietly made one of its more strategic product moves of the quarter: full third-party applications can now run inside Claude. Announced via its developer channels and blog on November 10-11, the expansion of MCP Apps adds App Tools and Embedded Sites to the protocol extension, so a developer's complete application - not a stripped-down interactive view - runs inside the Claude web app and desktop client, opening beside the conversation or expanding to full screen.

The change is easiest to see in the supported connectors. Users can open a Confluence page or a Notion database and get the full editor, signed in with their own account, rather than the small live previews interactive connectors previously offered. From the same screen they can ask Claude to write, edit or restructure content, and watch changes appear in the tool as they are made. Anthropic named Adobe, Atlassian, Box, HubSpot and Notion as the first interactive connectors showcasing the capability: retouching photos and redacting PDFs through Adobe, editing Confluence pages live, revising Box files with side-by-side version comparison, prioritizing HubSpot pipelines, and building Notion documents and databases mid-conversation.

The initial directory leaning on the new primitives includes Asana, Canva, Carta, Dropbox, monday.com, Smartsheet, Vercel and Webflow, with Figma, Harvey and Shopify building integrations. Tools can be pinned to the sidebar or reached from the + menu, and a connected tool can be launched without writing a prompt first. Every action still passes through the same connector approval flow that existed before - Claude can modify the page, row or file the user has open only after the user approves, and results sync back to the underlying application.

For developers, support for the new embedded capabilities is in public preview, available immediately through Anthropic's developer documentation. For organization admins, nothing structural changes: if a connector's tools are already allowed, the new features appear as they roll out, and admins can restrict connector tools with the same controls as today.

The strategically important part is what MCP Apps is not: Claude-exclusive. Anthropic describes it as an open extension to the Model Context Protocol, meaning an app built for Claude can run in any AI application that supports the extension. That is a deliberate bid to make the app-in-chat pattern a protocol-level standard rather than a platform lock-in play - and it gives third-party developers a reason to build once and distribute everywhere, with Anthropic's enormous consumer and business user base as the anchor deployment.

The launch lands alongside Anthropic's office-suite push - Claude Sheets, Whiteboards and Data began rolling out this week - and together they sketch the same thesis from two directions: Anthropic wants the chat window to become the place where work happens, whether the work is done by Claude natively or inside someone else's software. The competitive subtext with Microsoft 365 is hard to miss. If the chat client becomes the workspace, owning the protocol that apps plug into matters more than owning the apps - and Anthropic has just moved first on the open standard.

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