Make Repository field properly optional in server.json (#717)

<!-- Provide a brief summary of your changes -->

## Motivation and Context
<!-- Why is this change needed? What problem does it solve? -->
The Repository field in ServerJSON was not properly omitting empty
values
when marshaling to JSON. Even when a server had no repository
configured,
the JSON would include `"repository": {"url": "", "source": ""}` due to:

1. Repository struct fields (URL, Source) lacking omitempty tags
2. Repository being a value type instead of pointer in ServerJSON

This caused validation warnings for servers without repository URLs.

Changes:
- Add omitempty tags to Repository.URL and Repository.Source fields
- Change ServerJSON.Repository from model.Repository to
*model.Repository
- Update validateRepository to handle nil pointers
- Update all code creating Repository instances to use pointers

Now, servers without repository information correctly omit the field
entirely from JSON output, eliminating spurious validation warnings.
## How Has This Been Tested?
<!-- Have you tested this in a real application? Which scenarios were
tested? -->

## Breaking Changes
<!-- Will users need to update their code or configurations? -->

## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [ ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ ] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

## Additional context
<!-- Add any other context, implementation notes, or design decisions
-->

Signed-off-by: Radoslav Dimitrov <[email protected]>

Author: rdimitrov

cmd/publisher/commands/init.go

@@ -387,14 +387,17 @@ func createServerJSON(
 	}
 
 	// Create repository with optional subfolder
-	repo := model.Repository{
-		URL:    repoURL,
-		Source: repoSource,
-	}
+	var repo *model.Repository
+	if repoURL != "" && repoSource != "" {
+		repo = &model.Repository{
+			URL:    repoURL,
+			Source: repoSource,
+		}
 
-	// Only set subfolder if we're actually in a subdirectory
-	if subfolder != "" {
-		repo.Subfolder = subfolder
+		// Only set subfolder if we're actually in a subdirectory
+		if subfolder != "" {
+			repo.Subfolder = subfolder
+		}
 	}
 
 	// Create server structure

cmd/publisher/commands/publish_test.go

@@ -69,7 +69,7 @@ func TestPublishCommand_DeprecatedSchema(t *testing.T) {
 				Name:        "com.example/test-server",
 				Description: "A test server",
 				Version:     "1.0.0",
-				Repository: model.Repository{
+				Repository: &model.Repository{
 					URL:    "https://github.com/example/test",
 					Source: "github",
 				},

internal/api/handlers/v0/edit_test.go

@@ -46,7 +46,7 @@ func TestEditServerEndpoint(t *testing.T) {
 			Name:        "io.github.testuser/editable-server",
 			Description: "Server that can be edited",
 			Version:     "1.0.0",
-			Repository: model.Repository{
+			Repository: &model.Repository{
 				URL:    "https://github.com/testuser/editable-server",
 				Source: "github",
 				ID:     "testuser/editable-server",
@@ -57,7 +57,7 @@ func TestEditServerEndpoint(t *testing.T) {
 			Name:        "io.github.otheruser/other-server",
 			Description: "Server owned by another user",
 			Version:     "1.0.0",
-			Repository: model.Repository{
+			Repository: &model.Repository{
 				URL:    "https://github.com/otheruser/other-server",
 				Source: "github",
 				ID:     "otheruser/other-server",
@@ -77,7 +77,7 @@ func TestEditServerEndpoint(t *testing.T) {
 		Name:        "io.github.testuser/deleted-server",
 		Description: "Server that was deleted",
 		Version:     "1.0.0",
-		Repository: model.Repository{
+		Repository: &model.Repository{
 			URL:    "https://github.com/testuser/deleted-server",
 			Source: "github",
 			ID:     "testuser/deleted-server",
@@ -96,7 +96,7 @@ func TestEditServerEndpoint(t *testing.T) {
 		Name:        "io.github.testuser/build-metadata-server",
 		Description: "Server with build metadata version",
 		Version:     "1.0.0+20130313144700",
-		Repository: model.Repository{
+		Repository: &model.Repository{
 			URL:    "https://github.com/testuser/build-metadata-server",
 			Source: "github",
 			ID:     "testuser/build-metadata-server",
@@ -133,7 +133,7 @@ func TestEditServerEndpoint(t *testing.T) {
 				Name:        "io.github.testuser/editable-server",
 				Description: "Updated server description",
 				Version:     "1.0.0",
-				Repository: model.Repository{
+				Repository: &model.Repository{
 					URL:    "https://github.com/testuser/editable-server",
 					Source: "github",
 					ID:     "testuser/editable-server",
@@ -347,7 +347,7 @@ func TestEditServerEndpoint(t *testing.T) {
 				Name:        "io.github.testuser/build-metadata-server",
 				Description: "Updated server with build metadata",
 				Version:     "1.0.0+20130313144700",
-				Repository: model.Repository{
+				Repository: &model.Repository{
 					URL:    "https://github.com/testuser/build-metadata-server",
 					Source: "github",
 					ID:     "testuser/build-metadata-server",

internal/api/handlers/v0/publish_integration_test.go

@@ -60,7 +60,7 @@ func TestPublishIntegration(t *testing.T) {
 			Schema:      model.CurrentSchemaURL,
 			Name:        "io.github.testuser/test-mcp-server",
 			Description: "A test MCP server for integration testing",
-			Repository: model.Repository{
+			Repository: &model.Repository{
 				URL:    "https://github.com/testuser/test-mcp-server",
 				Source: "github",
 				ID:     "testuser/test-mcp-server",
@@ -105,7 +105,7 @@ func TestPublishIntegration(t *testing.T) {
 			Schema:      model.CurrentSchemaURL,
 			Name:        "com.example/test-mcp-server-no-auth",
 			Description: "A test MCP server without authentication",
-			Repository: model.Repository{
+			Repository: &model.Repository{
 				URL:    "https://github.com/example/test-server",
 				Source: "github",
 				ID:     "example/test-server",
@@ -191,7 +191,7 @@ func TestPublishIntegration(t *testing.T) {
 			Name:        "io.github.other/test-server",
 			Description: "A test server",
 			Version:     "1.0.0",
-			Repository: model.Repository{
+			Repository: &model.Repository{
 				URL:    "https://github.com/example/test-server",
 				Source: "github",
 				ID:     "example/test-server",

internal/api/handlers/v0/publish_test.go

@@ -59,7 +59,7 @@ func TestPublishEndpoint(t *testing.T) {
 				Schema:      model.CurrentSchemaURL,
 				Name:        "io.github.example/test-server",
 				Description: "A test server",
-				Repository: model.Repository{
+				Repository: &model.Repository{
 					URL:    "https://github.com/example/test-server",
 					Source: "github",
 					ID:     "example/test-server",
@@ -84,7 +84,7 @@ func TestPublishEndpoint(t *testing.T) {
 				Schema:      model.CurrentSchemaURL,
 				Name:        "example/test-server",
 				Description: "A test server without auth",
-				Repository: model.Repository{
+				Repository: &model.Repository{
 					URL:    "https://github.com/example/test-server",
 					Source: "github",
 					ID:     "example/test-server",
@@ -149,7 +149,7 @@ func TestPublishEndpoint(t *testing.T) {
 				Name:        "io.github.other/test-server",
 				Description: "A test server",
 				Version:     "1.0.0",
-				Repository: model.Repository{
+				Repository: &model.Repository{
 					URL:    "https://github.com/example/test-server",
 					Source: "github",
 					ID:     "example/test-server",
@@ -174,7 +174,7 @@ func TestPublishEndpoint(t *testing.T) {
 				Name:        "example/test-server",
 				Description: "A test server",
 				Version:     "1.0.0",
-				Repository: model.Repository{
+				Repository: &model.Repository{
 					URL:    "https://github.com/example/test-server",
 					Source: "github",
 					ID:     "example/test-server",
@@ -193,7 +193,7 @@ func TestPublishEndpoint(t *testing.T) {
 					Name:        "example/test-server",
 					Description: "Existing test server",
 					Version:     "1.0.0",
-					Repository: model.Repository{
+					Repository: &model.Repository{
 						URL:    "https://github.com/example/test-server-existing",
 						Source: "github",
 						ID:     "example/test-server-existing",
@@ -239,7 +239,7 @@ func TestPublishEndpoint(t *testing.T) {
 				Name:        "com.example/server/path",
 				Description: "Server with multiple slashes in name",
 				Version:     "1.0.0",
-				Repository: model.Repository{
+				Repository: &model.Repository{
 					URL:    "https://github.com/example/test-server",
 					Source: "github",
 					ID:     "example/test-server",
@@ -334,7 +334,7 @@ func TestPublishEndpoint(t *testing.T) {
 				Name:        "com.example/test/server/v2",
 				Description: "Complex server with invalid name",
 				Version:     "2.0.0",
-				Repository: model.Repository{
+				Repository: &model.Repository{
 					URL:    "https://github.com/example/test-server",
 					Source: "github",
 					ID:     "example/test-server",

internal/api/handlers/v0/telemetry_test.go

@@ -27,7 +27,7 @@ func TestPrometheusHandler(t *testing.T) {
 		Schema:      model.CurrentSchemaURL,
 		Name:        "io.github.example/test-server",
 		Description: "Test server detail",
-		Repository: model.Repository{
+		Repository: &model.Repository{
 			URL:    "https://github.com/example/test-server",
 			Source: "github",
 			ID:     "example/test-server",

internal/importer/importer_test.go

@@ -26,7 +26,7 @@ func TestImportService_LocalFile(t *testing.T) {
 			Schema:      model.CurrentSchemaURL,
 			Name:        "io.github.test/test-server-1",
 			Description: "Test server 1",
-			Repository: model.Repository{
+			Repository: &model.Repository{
 				URL:    "https://github.com/test/repo1",
 				Source: "github",
 				ID:     "123",
@@ -69,7 +69,7 @@ func TestImportService_HTTPFile(t *testing.T) {
 			Schema:      model.CurrentSchemaURL,
 			Name:        "io.github.test/http-test-server",
 			Description: "HTTP test server",
-			Repository: model.Repository{
+			Repository: &model.Repository{
 				URL:    "https://github.com/test/http-repo",
 				Source: "github",
 				ID:     "456",

internal/validators/validators.go

@@ -74,7 +74,7 @@ func ValidateServerJSON(serverJSON *apiv0.ServerJSON) error {
 	}
 
 	// Validate repository
-	if err := validateRepository(&serverJSON.Repository); err != nil {
+	if err := validateRepository(serverJSON.Repository); err != nil {
 		return err
 	}
 
@@ -122,8 +122,8 @@ func ValidateServerJSON(serverJSON *apiv0.ServerJSON) error {
 }
 
 func validateRepository(obj *model.Repository) error {
-	// Skip validation for empty repository (optional field)
-	if obj.URL == "" && obj.Source == "" {
+	// Skip validation if repository is nil or empty (optional field)
+	if obj == nil || (obj.URL == "" && obj.Source == "") {
 		return nil
 	}