Supersede older widget instances changedconnectors/building/mcp-apps/instance-supersession
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Upstream edited this page at 25 Sep 2026 18:00 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 22 Oct 2026 18:07 UTC.
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240240## Next steps
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242242* [Set `ui.domain` for Claude](/docs/connectors/building/mcp-apps/getting-started#set-ui-domain-for-claude): how to compute `_meta.ui.domain` for Claude
243* [Troubleshoot MCP Apps](/docs/connectors/building/mcp-apps/troubleshooting): developer tools and fixes when a widget doesn't render
243* [Troubleshoot MCP Apps](/docs/connectors/building/mcp-apps/troubleshooting.md): developer tools and fixes when a widget doesn't render
244244* [SDK API reference](https://modelcontextprotocol.github.io/ext-apps/api/index.html): `registerAppTool`, `App`, and `McpUiResourceMeta`
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