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MCP & Skills StandardizationAnthropic, OpenAI, MCP-UI (jointly)AnthropicOpenAIMCP (Model Context Protocol)

Anthropic, OpenAI and MCP-UI propose the MCP Apps extension (SEP-1865)

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Proposed the MCP Apps extension (SEP-1865)

Why it matters

Lets servers provide interactive UIs via the ui:// scheme and sandboxed iframes; co-authored by competing camps

Source — Primary sources first; secondary reports are labelled “Press”

Officialblog.modelcontextprotocol.iohttps://blog.modelcontextprotocol.io/posts/2025-11-21-mcp-apps/

Added in Week 35, 2026 · See that week

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  2. This recordAnthropic, OpenAI and MCP-UI propose the MCP Apps extension (SEP-1865)
  3. Next stopAnthropic, Block and OpenAI donate MCP to the Linux Foundation's AAIF
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Same week

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Nearby on the same axis

Anthropic releases advanced tool use in betaOfficialModel Context Protocol revises its specOfficialAnthropic, Block and OpenAI donate MCP to the Linux Foundation's AAIFOfficialAnthropic publishes Agent Skills as an open standard (agentskills.io)Press