feat(ui): support prefersBorder option for MCP Apps #6465
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Pull request overview
This PR adds support for the prefersBorder option in MCP App resource metadata, allowing apps to control whether they render with or without a UI wrapper border.
Changes:
- Introduced
ResourceDatainterface to consolidate resource state (html, csp, prefersBorder) - Read
prefersBorderfrom_meta.uiin resource responses with proper fallback totrue - Conditionally apply border and rounded corner styling based on preference
DOsinga
approved these changes
Jan 13, 2026
| } | ||
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| if (!resourceHtml) { | ||
| if (!resource.html) { |
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consider unifying the effective two arms of the if now that the payload is growing, i.e.
const toRender = resource.html ? <iframe> : "Loading MCP app..."
aharvard
commented
Jan 13, 2026
| resource.prefersBorder ? 'border border-borderSubtle rounded-lg' : 'my-6' | ||
| )} | ||
| > | ||
| {resource.html && proxyUrl ? ( |
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@DOsinga PTAL
I unified resource.html and proxyUrl as we don't need a discrete state for proxyUrl loading
Also, leaving this inline instead of extracting as a const. I noticed a hard-to-reproduce issue where the iframe ref might have gotten lost or something... the rendered mcp app would be sitting there w/ no messages being sent down. Maybe a closure issue? Not sure. But I think what I got works.
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* main: (41 commits) Allow customizing the new line keybinding in the CLI (#5956) Ask for permission in the CLI (#6475) docs: add Ralph Loop tutorial for multi-model iterative development (#6455) Remove gitignore fallback from gooseignore docs (#6480) fix: clean up result recording for code mode (#6343) fix(code_execution): handle model quirks with tool calls (#6352) feat(ui): support prefersBorder option for MCP Apps (#6465) fixed line breaks (#6459) Use Intl.NumberFormat for token formatting in SessionsInsights (#6466) feat(ui): format large and small token counts for readability (#6449) fix: apply subrecipes when using slash commands (#6460) Fix: exclude platform_schedule_tool in CLI (#6442) Fix: Small update in how ML-based prompt injection determines final result (#6439) docs: remove SSE transport and rename to Streamable HTTP (#6319) fix: correct Cloudinary extension command and env variable (#6453) fix: add gap between buttons in MacDesktopInstallButtons.js (#6452) refactor: include hidden dotfiles folders in file picker search (#6315) upgraded safe npm packages (#6450) chore(deps): bump react-router and react-router-dom in /ui/desktop (#6408) chore(deps): bump lru from 0.12.5 to 0.16.3 (#6379) ...
lifeizhou-ap
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Jan 14, 2026
* main: fix: require auth when running goose on non loopback address (#6478) chore(deps): bump hono from 4.11.3 to 4.11.4 in /ui/desktop (#6485) feat(cli): graceful fallback for keyring failures (#5808) fix: support global .gooseignore and negation patterns (#6157) docs: manual config for jetbrains (#6490) fix: Recipe slash command doesn't work with single optional parameter (#6235) fix(openrouter): Handle Gemini thoughtSignature for tool calls (#6370) docs: fix extensions page (#6484) Allow customizing the new line keybinding in the CLI (#5956) Ask for permission in the CLI (#6475) docs: add Ralph Loop tutorial for multi-model iterative development (#6455) Remove gitignore fallback from gooseignore docs (#6480) fix: clean up result recording for code mode (#6343) fix(code_execution): handle model quirks with tool calls (#6352) feat(ui): support prefersBorder option for MCP Apps (#6465) fixed line breaks (#6459) Use Intl.NumberFormat for token formatting in SessionsInsights (#6466) feat(ui): format large and small token counts for readability (#6449) fix: apply subrecipes when using slash commands (#6460)
ThanhNguyxn
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Signed-off-by: ThanhNguyxn <[email protected]>
zanesq
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Jan 14, 2026
…ased * 'main' of github.com:block/goose: fix(code_execution): serialize record_result output as JSON (#6495) perf(google): avoid accumulating thoughtSignatures across conversation history (#6462) fix(openai): make tool_call arguments optional and fix silent stream termination (#6309) fix: Improve error messages for invalid tool calls (#6483) fix: require auth when running goose on non loopback address (#6478) chore(deps): bump hono from 4.11.3 to 4.11.4 in /ui/desktop (#6485) feat(cli): graceful fallback for keyring failures (#5808) fix: support global .gooseignore and negation patterns (#6157) docs: manual config for jetbrains (#6490) fix: Recipe slash command doesn't work with single optional parameter (#6235) fix(openrouter): Handle Gemini thoughtSignature for tool calls (#6370) docs: fix extensions page (#6484) Allow customizing the new line keybinding in the CLI (#5956) Ask for permission in the CLI (#6475) docs: add Ralph Loop tutorial for multi-model iterative development (#6455) Remove gitignore fallback from gooseignore docs (#6480) fix: clean up result recording for code mode (#6343) fix(code_execution): handle model quirks with tool calls (#6352) feat(ui): support prefersBorder option for MCP Apps (#6465) fixed line breaks (#6459)
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Summary
Adds support for the
_meta.ui.prefersBorderoption in MCP App resources. When an MCP App returnsprefersBorder: falsein its resource metadata, the UI wrapper border and rounded corners are removed, allowing the app to render edge-to-edge.Changes
prefersBorderfrom_meta.uiin the resource response (defaults totrue)ResourceDataobject for cleaner codeUsage
MCP Apps can now specify border preference in their resource response:
{ "uri": "ui://widget/example.html", "mimeType": "text/html;profile=mcp-app", "_meta": { "ui": { "prefersBorder": false } }, "text": "<!doctype html>..." }Before / After
Before: MCP App with default border and rounded corners
After: MCP App with
prefersBorder: false- no wrapper border