aminghadersohi opened a new pull request, #40350:
URL: https://github.com/apache/superset/pull/40350
### SUMMARY
Adds a new MCP mutation tool `create_css_template` that allows AI assistants
to create named CSS templates for dashboards via the Model Context Protocol.
Changes:
- `superset/commands/css/create.py` — new `CreateCssTemplateCommand`
following the existing command pattern
- `superset/commands/css/exceptions.py` — adds
`CssTemplateCreateFailedError` and `CssTemplateInvalidError`
- `superset/mcp_service/css_template/` — new MCP module with Pydantic
schemas and the `@tool`-decorated function
- `superset/mcp_service/app.py` — registers `create_css_template` on startup
The tool requires `CssTemplate` write permission (same as `POST
/api/v1/css_template/`), uses `readOnlyHint=False`, and returns the created
template's `id`, `template_name`, and `css`.
### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
N/A — backend MCP tool, no UI changes.
### TESTING INSTRUCTIONS
1. Start the MCP server
2. Call `create_css_template` with `{"template_name": "My Theme", "css":
".header { color: red; }"}`
3. Verify the response returns a non-null `id`, the `template_name`, and the
`css`
4. Confirm the template appears in `GET /api/v1/css_template/`
### ADDITIONAL INFORMATION
- [ ] Has associated issue:
- [ ] Required feature flags:
- [ ] Changes UI
- [ ] Includes DB Migration (follow approval process in
[SIP-59](https://github.com/apache/superset/issues/13351))
- [ ] Migration is atomic, supports rollback & is backwards-compatible
- [ ] Confirm DB migration upgrade and downgrade tested
- [ ] Runtime estimates and downtime expectations provided
- [x] Introduces new feature or API
- [ ] Removes existing feature or API
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