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Sweep 10 Nov 2026 · 02:18Z Build v2.1.322 539 read Stable v2.1.311 Latest v2.1.322 Next v2.1.322 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.280 ·

MCP Apps (SEP-1865): support for UI resources via mcp_read_resource

Claude Code adds MCP Apps support, letting a connected MCP server's tools render UI resources through a new mcp_read_resource protocol subtype

Group of 2 Use it now Notable New Features
JSON All of v2.1.280
Use it nowTier: how much it should matter to you
5Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
MCPArea: what it touches
New FeaturesKind: in v2.1.280,
What probably matters to youSection of the release

What

  • A new protocol subtype mcp_read_resource lets a host read a ui:// resource from a connected MCP server (via resources/read) for rendering an MCP Apps UI panel.
  • Tool definitions can now carry a validated _meta field surfacing ui.resourceUri and ui.visibility (or the deprecated flat ui/resourceUri).
  • Two new capabilities, mcp_read_resource_v1 and mcp_tool_ui_meta_v1, are advertised during session setup, unless disabled by a local flag.

Why This is the initial support for MCP Apps (SEP-1865), letting MCP servers define rich UI panels tied to their tools rather than plain text output.

Read from
Names in the bundlemcp_read_resource_meta.ui
What the documentation says
Documented inclaude-code/agent-sdk/typescript
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Confirmed since Anthropic's documentation has since written up _meta.ui, on Design guidelines. Set `_meta.ui.prefersBorder` to `true` or `false` to control whether your content renders with a border. If you don't set it, content renders borderless on web and bordered on mobile. connectors/building/mcp-apps/design-guidelines see the edit
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up _meta.ui, on Design guidelines.

See this entry in the whole of v2.1.280 →

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