codeant-ai-for-open-source[bot] commented on PR #38402:
URL: https://github.com/apache/superset/pull/38402#issuecomment-4054528334
## **Sequence Diagram**
This PR adds a new handlebars chart type path in MCP so requests with custom
HTML templates can be validated and converted into Superset form data. The core
change is mode-aware handling for raw versus aggregate queries before chart
creation or explore link generation.
```mermaid
sequenceDiagram
participant User
participant MCP Service
participant Schema Validator
participant Chart Utils
participant Superset Backend
User->>MCP Service: Send chart request with chart_type handlebars
MCP Service->>Schema Validator: Pre validate template and query mode
Schema Validator-->>MCP Service: Return validated handlebars config
MCP Service->>Chart Utils: Map config to form data
alt query mode raw
Chart Utils->>Chart Utils: Map selected columns for raw rows
else query mode aggregate
Chart Utils->>Chart Utils: Map metrics and optional groupby
end
Chart Utils-->>MCP Service: Return handlebars form data
MCP Service->>Superset Backend: Create chart or generate explore result
Superset Backend-->>User: Return chart response
```
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