A developer encountered an issue where HTML widgets, known as MCP Apps, were not rendering within Claude's interface despite successful tool calls. After extensive testing, the developer discovered that the issue stemmed from the `_meta.ui.domain` field, which is used for origin stability and CORS allowlisting. Incorrect values for this field, often due to subtle differences between the client's URL and the computed hash, caused the widgets to fail silently. AI
IMPACT Identifies a specific integration bug impacting developers building applications on Claude's platform.
RANK_REASON Developer troubleshooting a specific product integration issue.
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