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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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GPG key ID: B5690EEEBB952194
4 changed files with 17 additions and 6 deletions
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2
examples/server/everything/main.go
View file

@ -291,6 +291,6 @@ func mcpIcons() []mcp.Icon {
Source: "data:image/png;base64," + base64.StdEncoding.EncodeToString(mcpIconData),
MIMEType: "image/png",
Sizes: []string{"48x48"},
Theme: "light", // or "dark" or empty
Theme: mcp.IconThemeLight,
}}
}

2
mcp/conformance_test.go
View file

@ -152,7 +152,7 @@ var iconObj = Icon{
Source: "foobar",
MIMEType: "image/png",
Sizes: []string{"48x48", "96x96"},
Theme: "light",
Theme: IconThemeLight,
}
// runServerTest runs the server conformance test.

4
mcp/content_test.go
View file

@ -121,7 +121,7 @@ func TestContent(t *testing.T) {
Description: "This resource demonstrates all fields",
MIMEType: "text/plain",
Meta: mcp.Meta{"custom": "metadata"},
Icons: []mcp.Icon{{Source: "foobar", MIMEType: "image/png", Sizes: []string{"48x48"}, Theme: "light"}},
Icons: []mcp.Icon{{Source: "foobar", MIMEType: "image/png", Sizes: []string{"48x48"}, Theme: mcp.IconThemeLight}},
},
`{"type":"resource_link","mimeType":"text/plain","uri":"https://example.com/resource","name":"Example Resource","title":"A comprehensive example resource","description":"This resource demonstrates all fields","_meta":{"custom":"metadata"},"icons":[{"src":"foobar","mimeType":"image/png","sizes":["48x48"],"theme":"light"}]}`,
},
@ -217,7 +217,7 @@ func TestContentUnmarshal(t *testing.T) {
// Meta: mcp.Meta{"custom": "metadata"},
Size: &valInt64,
Annotations: &mcp.Annotations{Audience: []mcp.Role{"user", "assistant"}, LastModified: "2025-01-12T15:00:58Z", Priority: 0.5},
Icons: []mcp.Icon{{Source: "foobar", MIMEType: "image/png", Sizes: []string{"48x48"}, Theme: "light"}},
Icons: []mcp.Icon{{Source: "foobar", MIMEType: "image/png", Sizes: []string{"48x48"}, Theme: mcp.IconThemeLight}},
},
},
}

15
mcp/protocol.go
View file

@ -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.