feat: support the user_connections manifest feature

internal/shared/types/app_manifest.go

@@ -80,6 +80,7 @@ type AppFeatures struct {
 	Search                     *Search                     `json:"search,omitempty" yaml:"search,flow,omitempty"`
 	RichPreviews               *RichPreviews               `json:"rich_previews,omitempty" yaml:"rich_previews,flow,omitempty"`
 	CodeChannels               *CodeChannels               `json:"code_channels,omitempty" yaml:"code_channels,flow,omitempty"`
+	UserConnections            *UserConnections            `json:"user_connections,omitempty" yaml:"user_connections,flow,omitempty"`
 }
 
 type RichPreviews struct {
@@ -300,6 +301,11 @@ type CodeChannels struct {
 	SlashCommandURL string `json:"slash_command_url,omitempty" yaml:"slash_command_url,omitempty"`
 }
 
+type UserConnections struct {
+	IsEnabled bool     `json:"is_enabled" yaml:"is_enabled"`
+	AuthHosts []string `json:"auth_hosts" yaml:"auth_hosts,flow"`
+}
+
 // Workflow defines the structure of a workflow in the app manifest.
 type Workflow struct {
 	Title             string             `json:"title" yaml:"title"`

internal/shared/types/app_manifest_test.go

@@ -273,6 +273,30 @@ func Test_AppManifest_AppFeatures(t *testing.T) {
 			},
 			want: `{"app_home":{},"bot_user":{"display_name":"coding_agent"},"code_channels":{"enabled":false}}`,
 		},
+		"includes user connections when provided": {
+			features: AppFeatures{
+				BotUser: BotUser{
+					DisplayName: "connector",
+				},
+				UserConnections: &UserConnections{
+					IsEnabled: true,
+					AuthHosts: []string{"example.com", "auth.example.com"},
+				},
+			},
+			want: `{"app_home":{},"bot_user":{"display_name":"connector"},"user_connections":{"is_enabled":true,"auth_hosts":["example.com","auth.example.com"]}}`,
+		},
+		"serializes user connections disabled explicitly": {
+			features: AppFeatures{
+				BotUser: BotUser{
+					DisplayName: "connector",
+				},
+				UserConnections: &UserConnections{
+					IsEnabled: false,
+					AuthHosts: []string{"example.com"},
+				},
+			},
+			want: `{"app_home":{},"bot_user":{"display_name":"connector"},"user_connections":{"is_enabled":false,"auth_hosts":["example.com"]}}`,
+		},
 	}
 	for name, tc := range tests {
 		t.Run(name, func(t *testing.T) {
@@ -283,6 +307,43 @@ func Test_AppManifest_AppFeatures(t *testing.T) {
 	}
 }
 
+func Test_AppManifest_AppFeatures_UserConnections(t *testing.T) {
+	tests := map[string]struct {
+		manifestJSON string
+		expected     *UserConnections
+	}{
+		"undefined user connections are omitted": {
+			manifestJSON: `{"display_information":{"name":"connector"},"features":{"app_home":{},"bot_user":{"display_name":"connector"}}}`,
+			expected:     nil,
+		},
+		"enabled user connections are preserved": {
+			manifestJSON: `{"display_information":{"name":"connector"},"features":{"app_home":{},"bot_user":{"display_name":"connector"},"user_connections":{"is_enabled":true,"auth_hosts":["example.com","auth.example.com"]}}}`,
+			expected: &UserConnections{
+				IsEnabled: true,
+				AuthHosts: []string{"example.com", "auth.example.com"},
+			},
+		},
+		"disabled user connections keep their auth hosts": {
+			manifestJSON: `{"display_information":{"name":"connector"},"features":{"app_home":{},"bot_user":{"display_name":"connector"},"user_connections":{"is_enabled":false,"auth_hosts":["example.com"]}}}`,
+			expected: &UserConnections{
+				IsEnabled: false,
+				AuthHosts: []string{"example.com"},
+			},
+		},
+	}
+	for name, tc := range tests {
+		t.Run(name, func(t *testing.T) {
+			var manifest AppManifest
+			err := json.Unmarshal([]byte(tc.manifestJSON), &manifest)
+			require.NoError(t, err)
+			assert.Equal(t, tc.expected, manifest.Features.UserConnections)
+			actualJSON, err := json.Marshal(manifest)
+			require.NoError(t, err)
+			assert.JSONEq(t, tc.manifestJSON, string(actualJSON))
+		})
+	}
+}
+
 func Test_AppManifest_AppSettings_SiwsLinks(t *testing.T) {
 	expectedSiws := SiwsLinks{
 		InitiateURI: "an initiate uri",