Description

The Auto Visualiser extension is enabled (confirmed via Extension Manager - listed under "Extensions available to disable"), but visualizations do not render inline in the conversation as described in the August 27, 2025 blog post.

Expected Behavior

Per the Auto Visualiser blog post:

1. Auto Visualiser should automatically detect when data would benefit from visualization and render it inline
2. Users can explicitly request visualizations (sankey, radar, donut, bar, etc.)
3. Visualizations should render directly in the conversation using MCP-UI

Actual Behavior

1. Auto Visualiser extension IS enabled in the session
2. Autovisualiser tools (showChart, renderDonut, renderRadar, etc.) execute without errors
3. Tools return null / empty string instead of visualization data
4. No visualization renders inline in the conversation

Steps to Reproduce

1. Enable Auto Visualiser extension (if not already enabled)
2. Ask for a visualization, e.g., "show me a donut chart" or use Autovisualiser.renderDonut tool
3. Tool executes successfully but returns null/empty
4. No visualization appears in the conversation

Environment

• Goose version: latest
• Auto Visualiser extension: enabled
• Apps extension: enabled (for comparison)

Additional Notes

• The Apps extension DOES work - chart apps can be created and opened in the Apps tab
• Other enabled extensions (filesystem, developer, todo, fetch, etc.) work normally
• This appears to be specifically an issue with how Auto Visualiser returns/renders MCP-UI content inline

Workaround

Using the Apps extension to manually create chart apps works as a workaround.