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[research] MCP Apps support for TUIs

enhancementNew feature or requestNew feature or request

Status: Open.

#419 In modelcontextprotocol/ext-apps;

· liady opened on Jan 31, 2026

View state persistence

enhancementNew feature or requestNew feature or request

protocol

Status: Open.

#417 In modelcontextprotocol/ext-apps;

· idosal opened on Jan 31, 2026

Mechanism to defer <code>UIResource</code> rendering for intermediate tool calls

Status: Open.

#402 In modelcontextprotocol/ext-apps;

· JorisAndrade opened on Jan 29, 2026

Unable to render Color Picker UI in Cursor

bugSomething isn't workingSomething isn't working

Status: Open.

#396 In modelcontextprotocol/ext-apps;

· AseemWangoo opened on Jan 29, 2026

Example App not working in Claude Desktop, no UI displayed

bugSomething isn't workingSomething isn't working

Status: Open.

#395 In modelcontextprotocol/ext-apps;

· sibendu opened on Jan 29, 2026

Support <code>frameDomains</code> → <code>frame-src</code> CSP Mapping for External Iframe Embeds

enhancementNew feature or requestNew feature or request

Status: Open.

#387 In modelcontextprotocol/ext-apps;

· fdaudens opened on Jan 28, 2026

MCP Apps SDK callServerTool() fails - "Invalid JSON-RPC message received" in Claude Desktop

bugSomething isn't workingSomething isn't working

Status: Open.

#386 In modelcontextprotocol/ext-apps;

· yaniv-golan opened on Jan 28, 2026

Getting errors when using server-map mcp app.

bugSomething isn't workingSomething isn't working

Status: Open.

#383 In modelcontextprotocol/ext-apps;

· dehlers-cts opened on Jan 28, 2026

Standardizing Host CSS Variables

documentationImprovements or additions to documentationImprovements or additions to documentation

Status: Open.

#382 In modelcontextprotocol/ext-apps;

· rabisg opened on Jan 27, 2026

Properly clarify content model visibility - content vs structuredContent vs _meta

documentationImprovements or additions to documentationImprovements or additions to documentation

Status: Open.

#380 In modelcontextprotocol/ext-apps;

· liady opened on Jan 27, 2026

Side Panels For Interactive Documents

enhancementNew feature or requestNew feature or request

Status: Open.

#412 In modelcontextprotocol/ext-apps;

· hodeware opened on Jan 27, 2026

MCP Apps portability issue: widgets render in ChatGPT but not Claude due to host-specific globals and asset assumptions

Status: Open.

#413 In modelcontextprotocol/ext-apps;

· hatgit opened on Jan 27, 2026