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fix: add legacy flat _meta key for MCP App rendering in Claude (#585)

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Claude.ai reads the flat `_meta["ui/resourceUri"]` key to discover UI apps,
not the nested `_meta.ui.resourceUri`. Without the flat key, tools like
n8n_health_check and n8n_list_workflows showed as collapsed accordions
instead of rendering rich UI. Now sets both keys, matching the behavior
of the official registerAppTool helper from @modelcontextprotocol/ext-apps.

Conceived by Romuald Członkowski - www.aiadvisors.pl/en

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Romuald Członkowski
2026-02-09 06:40:52 +01:00
committed by GitHub
parent 8217229e2f
commit 34159f4ece
5 changed files with 22 additions and 8 deletions
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8
src/mcp/ui/registry.ts
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@@ -64,13 +64,19 @@ export class UIAppRegistry {
* Enrich tool definitions with _meta.ui.resourceUri for tools that have
* a matching UI app. Per MCP ext-apps spec, this goes on the tool
* definition (tools/list), not the tool call response.
*
* Sets both nested (_meta.ui.resourceUri) and flat (_meta["ui/resourceUri"])
* keys for compatibility with hosts that read either format.
*/
static injectToolMeta(tools: Array<{ name: string; [key: string]: any }>): void {
if (!this.loaded) return;
for (const tool of tools) {
const entry = this.toolIndex.get(tool.name);
if (entry && entry.html) {
tool._meta = { ui: { resourceUri: entry.config.uri } };
tool._meta = {
ui: { resourceUri: entry.config.uri },
'ui/resourceUri': entry.config.uri,
};
}
}
}