Host matrix
| Host | Status | Notes |
|---|---|---|
preview_app() |
Available now | Uses the extracted host controller locally in a browser preview. |
| Standards-based MCP host | Available now |
McpApp still emits _meta.ui.resourceUri
and serves ui:// resources. |
| shinychat embedding | Available now | Use as_shinychat_tool(),
mcp_content_result(), or the host shell helpers. |
shinychat native ui:// support |
Future | The current adapter stays thin so it can collapse toward native support later. |
Output fallback matrix
| Result helper | MCP / preview | shinychat | Plain fallback |
|---|---|---|---|
mcp_result_text() |
text patch | tool-card text | text |
mcp_result_html() |
HTML patch | rich HTML card | text/HTML string |
mcp_result_table() |
table HTML patch | rich HTML card | printed table summary |
mcp_result_plot() |
base64 plot patch | embedded card or text summary | text summary |
mcp_result_image() |
image/plot patch | embedded card or image HTML | text summary |
mcp_result_pdf() |
HTML fallback | link-like HTML fallback | text summary |
mcp_result_widget() |
HTML patch | rich HTML card | text summary |
Migration modes
| Mode | Current status | Intended use |
|---|---|---|
| Authored runtime card | Supported | Primary path for production usage today |
| Wrapped module with explicit handler | Supported | Reuse bounded Shiny logic |
convert_app(mode = "cards") |
Scaffold | Split connected groups into chat-sized starting points |
convert_app(mode = "scaffold") |
Scaffold | Full-app starting point for manual completion |
| Headless subset execution | Future | Capability-detected bounded subset only |