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mcp: switch icon theme to named string type (#733)

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To be consistent with logging level, use a named string type for icon
themes. This improves readability / discoverability, and is more
consistent.

Updates #552
For #725
This commit is contained in:
Robert Findley 2025-12-19 13:44:10 -08:00 • committed by GitHub
commit 411d5a049a
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1 changed files with 17 additions and 6 deletions
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15
mcp/protocol.go
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@ -750,6 +750,16 @@ type ProgressNotificationParams struct {
func (*ProgressNotificationParams) isParams() {}
// IconTheme specifies the theme an icon is designed for.
type IconTheme string
const (
// IconThemeLight indicates the icon is designed for a light background.
IconThemeLight IconTheme = "light"
// IconThemeDark indicates the icon is designed for a dark background.
IconThemeDark IconTheme = "dark"
)
// Icon provides visual identifiers for their resources, tools, prompts, and implementations
// See [/specification/draft/basic/index#icons] for notes on icons
//
@ -763,8 +773,9 @@ type Icon struct {
MIMEType string `json:"mimeType,omitempty"`
// Optional size specification (e.g., ["48x48"], ["any"] for scalable formats like SVG, or ["48x48", "96x96"] for multiple sizes)
Sizes []string `json:"sizes,omitempty"`
// Optional Theme of the icon, e.g., "light" or "dark"
Theme string `json:"theme,omitempty"`
// Optional theme specifier. "light" indicates the icon is designed for a light
// background, "dark" indicates the icon is designed for a dark background.
Theme IconTheme `json:"theme,omitempty"`
}
// A prompt or prompt template that the server offers.