chore: update yaml tag for tools (#2356)

Update yaml tag in tools from `kind` to `type`.

Upcoming PRs: 
* Update config in `/tests` and `/docs`

Will resolve other unit tests failure in the final PR to keep things
simpler.

internal/tools/cloudsqlmssql/cloudsqlmssqlcreateinstance/cloudsqlmssqlcreateinstance.go

@@ -27,11 +27,11 @@ import (
 	"google.golang.org/api/sqladmin/v1"
 )
 
-const kind string = "cloud-sql-mssql-create-instance"
+const resourceType string = "cloud-sql-mssql-create-instance"
 
 func init() {
-	if !tools.Register(kind, newConfig) {
-		panic(fmt.Sprintf("tool type %q already registered", kind))
+	if !tools.Register(resourceType, newConfig) {
+		panic(fmt.Sprintf("tool type %q already registered", resourceType))
 	}
 }
 
@@ -52,7 +52,7 @@ type compatibleSource interface {
 // Config defines the configuration for the create-instances tool.
 type Config struct {
 	Name         string   `yaml:"name" validate:"required"`
-	Type         string   `yaml:"kind" validate:"required"`
+	Type         string   `yaml:"type" validate:"required"`
 	Description  string   `yaml:"description"`
 	Source       string   `yaml:"source" validate:"required"`
 	AuthRequired []string `yaml:"authRequired"`
@@ -61,9 +61,9 @@ type Config struct {
 // validate interface
 var _ tools.ToolConfig = Config{}
 
-// ToolConfigType returns the kind of the tool.
+// ToolConfigType returns the type of the tool.
 func (cfg Config) ToolConfigType() string {
-	return kind
+	return resourceType
 }
 
 // Initialize initializes the tool from the configuration.
@@ -74,7 +74,7 @@ func (cfg Config) Initialize(srcs map[string]sources.Source) (tools.Tool, error)
 	}
 	s, ok := rawS.(compatibleSource)
 	if !ok {
-		return nil, fmt.Errorf("invalid source for %q tool: source kind must be `cloud-sql-admin`", kind)
+		return nil, fmt.Errorf("invalid source for %q tool: source type must be `cloud-sql-admin`", resourceType)
 	}
 
 	project := s.GetDefaultProject()

internal/tools/cloudsqlmssql/cloudsqlmssqlcreateinstance/cloudsqlmssqlcreateinstance_test.go

@@ -17,7 +17,6 @@ package cloudsqlmssqlcreateinstance_test
 import (
 	"testing"
 
-	yaml "github.com/goccy/go-yaml"
 	"github.com/google/go-cmp/cmp"
 	"github.com/googleapis/genai-toolbox/internal/server"
 	"github.com/googleapis/genai-toolbox/internal/testutils"
@@ -37,11 +36,11 @@ func TestParseFromYaml(t *testing.T) {
 		{
 			desc: "basic example",
 			in: `
-			tools:
-				create-instance-tool:
-					kind: cloud-sql-mssql-create-instance
-					description: a test description
-					source: a-source
+			kind: tools
+			name: create-instance-tool
+			type: cloud-sql-mssql-create-instance
+			description: a test description
+			source: a-source
 			`,
 			want: server.ToolConfigs{
 				"create-instance-tool": cloudsqlmssqlcreateinstance.Config{
@@ -56,15 +55,11 @@ func TestParseFromYaml(t *testing.T) {
 	}
 	for _, tc := range tcs {
 		t.Run(tc.desc, func(t *testing.T) {
-			got := struct {
-				Tools server.ToolConfigs `yaml:"tools"`
-			}{}
-			// Parse contents
-			err := yaml.UnmarshalContext(ctx, testutils.FormatYaml(tc.in), &got)
+			_, _, _, got, _, _, err := server.UnmarshalResourceConfig(ctx, testutils.FormatYaml(tc.in))
 			if err != nil {
 				t.Fatalf("unable to unmarshal: %s", err)
 			}
-			if diff := cmp.Diff(tc.want, got.Tools); diff != "" {
+			if diff := cmp.Diff(tc.want, got); diff != "" {
 				t.Fatalf("incorrect parse: diff %v", diff)
 			}
 		})