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Render MCP App previews when hosts strip private metadata - #46
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Mirror artifact and workspace payloads into structuredContent (appPreview, appWorkspace), accept event_id on artifacts_preview, and let the app reopen a compact selection through artifacts_preview when only a version id arrives.
nicosuave
marked this pull request as ready for review
October 13, 2026 02:10
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Some MCP Apps hosts drop a tool result's
_metabefore forwarding it to the app iframe, leaving the Artifacts app with nothing to render.artifacts_preview(local, Cloudflare and managed paths) mirrors the artifact payload intostructuredContent.appPreview; workspace results mirror intoappWorkspace.artifacts_previewacceptsevent_id.artifact/preview.artifactselection it reopens it throughartifacts_preview.New e2e coverage fails without the runtime change; unit, worker and MCP App e2e suites pass locally.