feat(prebuilt/cloud-sql): Add create backup tool for Cloud SQL (#2141)

## Description

This pull request adds a new tool, cloud-sql-create-backup, which
enables taking a backup on a Cloud SQL instance from the toolbox using
the Cloud SQL Admin API. The tool supports optionally supplying a
location or description for the backup.

Tested:
<img width="1561" height="425" alt="image"
src="https://github.com/user-attachments/assets/c8984b07-5450-470a-9ac6-df16943e25e9"
/>


## PR Checklist

> Thank you for opening a Pull Request! Before submitting your PR, there
are a
> few things you can do to make sure it goes smoothly:

- [x] Make sure you reviewed

[CONTRIBUTING.md](https://github.com/googleapis/genai-toolbox/blob/main/CONTRIBUTING.md)
- [x] Make sure to open an issue as a

[bug/issue](https://github.com/googleapis/genai-toolbox/issues/new/choose)
  before writing your code! That way we can discuss the change, evaluate
  designs, and agree on the general idea
- [x] Ensure the tests and linter pass
- [x] Code coverage does not decrease (if any source code was changed)
- [x] Appropriate docs were updated (if necessary)
- [x] Make sure to add `!` if this involve a breaking change

🛠️ Fixes #2140

---------

Co-authored-by: Yuan Teoh <45984206+Yuan325@users.noreply.github.com>
Co-authored-by: Averi Kitsch <akitsch@google.com>

cmd/root.go

@@ -92,6 +92,7 @@ import (
 	_ "github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/cloudhealthcaresearchdicomstudies"
 	_ "github.com/googleapis/genai-toolbox/internal/tools/cloudmonitoring"
 	_ "github.com/googleapis/genai-toolbox/internal/tools/cloudsql/cloudsqlcloneinstance"
+	_ "github.com/googleapis/genai-toolbox/internal/tools/cloudsql/cloudsqlcreatebackup"
 	_ "github.com/googleapis/genai-toolbox/internal/tools/cloudsql/cloudsqlcreatedatabase"
 	_ "github.com/googleapis/genai-toolbox/internal/tools/cloudsql/cloudsqlcreateusers"
 	_ "github.com/googleapis/genai-toolbox/internal/tools/cloudsql/cloudsqlgetinstances"

cmd/root_test.go

@@ -1493,7 +1493,7 @@ func TestPrebuiltTools(t *testing.T) {
 			wantToolset: server.ToolsetConfigs{
 				"cloud_sql_postgres_admin_tools": tools.ToolsetConfig{
 					Name:      "cloud_sql_postgres_admin_tools",
-					ToolNames: []string{"create_instance", "get_instance", "list_instances", "create_database", "list_databases", "create_user", "wait_for_operation", "postgres_upgrade_precheck", "clone_instance"},
+					ToolNames: []string{"create_instance", "get_instance", "list_instances", "create_database", "list_databases", "create_user", "wait_for_operation", "postgres_upgrade_precheck", "clone_instance", "create_backup"},
 				},
 			},
 		},
@@ -1503,7 +1503,7 @@ func TestPrebuiltTools(t *testing.T) {
 			wantToolset: server.ToolsetConfigs{
 				"cloud_sql_mysql_admin_tools": tools.ToolsetConfig{
 					Name:      "cloud_sql_mysql_admin_tools",
-					ToolNames: []string{"create_instance", "get_instance", "list_instances", "create_database", "list_databases", "create_user", "wait_for_operation", "clone_instance"},
+					ToolNames: []string{"create_instance", "get_instance", "list_instances", "create_database", "list_databases", "create_user", "wait_for_operation", "clone_instance", "create_backup"},
 				},
 			},
 		},
@@ -1513,7 +1513,7 @@ func TestPrebuiltTools(t *testing.T) {
 			wantToolset: server.ToolsetConfigs{
 				"cloud_sql_mssql_admin_tools": tools.ToolsetConfig{
 					Name:      "cloud_sql_mssql_admin_tools",
-					ToolNames: []string{"create_instance", "get_instance", "list_instances", "create_database", "list_databases", "create_user", "wait_for_operation", "clone_instance"},
+					ToolNames: []string{"create_instance", "get_instance", "list_instances", "create_database", "list_databases", "create_user", "wait_for_operation", "clone_instance", "create_backup"},
 				},
 			},
 		},

docs/en/how-to/connect-ide/cloud_sql_mssql_admin_mcp.md

@@ -48,6 +48,7 @@ instance, database and users:
     * `roles/cloudsql.editor`: Provides permissions to manage existing resources.
         * All `viewer` tools
         * `create_database`
+        * `create_backup`
     * `roles/cloudsql.admin`: Provides full control over all resources.
         * All `editor` and `viewer` tools
         * `create_instance`
@@ -299,6 +300,7 @@ instances and interacting with your database:
 * **create_user**: Creates a new user in a Cloud SQL instance.
 * **wait_for_operation**: Waits for a Cloud SQL operation to complete.
 * **clone_instance**: Creates a clone of an existing Cloud SQL for SQL Server instance.
+* **create_backup**: Creates a backup on a Cloud SQL instance.
 
 {{< notice note >}}
 Prebuilt tools are pre-1.0, so expect some tool changes between versions. LLMs

docs/en/how-to/connect-ide/cloud_sql_mysql_admin_mcp.md

@@ -48,6 +48,7 @@ database and users:
     * `roles/cloudsql.editor`: Provides permissions to manage existing resources.
         * All `viewer` tools
         * `create_database`
+        * `create_backup`
     * `roles/cloudsql.admin`: Provides full control over all resources.
         * All `editor` and `viewer` tools
         * `create_instance`
@@ -299,6 +300,7 @@ instances and interacting with your database:
 * **create_user**: Creates a new user in a Cloud SQL instance.
 * **wait_for_operation**: Waits for a Cloud SQL operation to complete.
 * **clone_instance**: Creates a clone of an existing Cloud SQL for MySQL instance.
+* **create_backup**: Creates a backup on a Cloud SQL instance.
 
 {{< notice note >}}
 Prebuilt tools are pre-1.0, so expect some tool changes between versions. LLMs

docs/en/how-to/connect-ide/cloud_sql_pg_admin_mcp.md

@@ -48,6 +48,7 @@ instance, database and users:
     * `roles/cloudsql.editor`: Provides permissions to manage existing resources.
         * All `viewer` tools
         * `create_database`
+        * `create_backup`
     * `roles/cloudsql.admin`: Provides full control over all resources.
         * All `editor` and `viewer` tools
         * `create_instance`
@@ -299,6 +300,7 @@ instances and interacting with your database:
 * **create_user**: Creates a new user in a Cloud SQL instance.
 * **wait_for_operation**: Waits for a Cloud SQL operation to complete.
 * **clone_instance**: Creates a clone of an existing Cloud SQL for PostgreSQL instance.
+* **create_backup**: Creates a backup on a Cloud SQL instance.
 
 {{< notice note >}}
 Prebuilt tools are pre-1.0, so expect some tool changes between versions. LLMs

docs/en/reference/prebuilt-tools.md

@@ -187,6 +187,7 @@ See [Usage Examples](../reference/cli.md#examples).
         manage existing resources.
         * All `viewer` tools
         * `create_database`
+        * `create_backup`
     *   **Cloud SQL Admin** (`roles/cloudsql.admin`): Provides full control over
         all resources.
         * All `editor` and `viewer` tools
@@ -203,6 +204,7 @@ See [Usage Examples](../reference/cli.md#examples).
     *   `create_user`: Creates a new user in a Cloud SQL instance.
     *   `wait_for_operation`: Waits for a Cloud SQL operation to complete.
     *   `clone_instance`: Creates a clone for an existing Cloud SQL for MySQL instance.
+    *   `create_backup`: Creates a backup on a Cloud SQL instance.
 
 ## Cloud SQL for PostgreSQL
 
@@ -275,6 +277,7 @@ See [Usage Examples](../reference/cli.md#examples).
         manage existing resources.
         * All `viewer` tools
         * `create_database`
+        * `create_backup`
     *   **Cloud SQL Admin** (`roles/cloudsql.admin`): Provides full control over
         all resources.
         * All `editor` and `viewer` tools
@@ -290,6 +293,7 @@ See [Usage Examples](../reference/cli.md#examples).
     *   `create_user`: Creates a new user in a Cloud SQL instance.
     *   `wait_for_operation`: Waits for a Cloud SQL operation to complete.
     *   `clone_instance`: Creates a clone for an existing Cloud SQL for PostgreSQL instance.
+    *   `create_backup`: Creates a backup on a Cloud SQL instance.
 
 ## Cloud SQL for SQL Server
 
@@ -336,6 +340,7 @@ See [Usage Examples](../reference/cli.md#examples).
         manage existing resources.
         * All `viewer` tools
         * `create_database`
+        * `create_backup`
     *   **Cloud SQL Admin** (`roles/cloudsql.admin`): Provides full control over
         all resources.
         * All `editor` and `viewer` tools
@@ -351,6 +356,7 @@ See [Usage Examples](../reference/cli.md#examples).
     *   `create_user`: Creates a new user in a Cloud SQL instance.
     *   `wait_for_operation`: Waits for a Cloud SQL operation to complete.
     *   `clone_instance`: Creates a clone for an existing Cloud SQL for SQL Server instance.
+    *   `create_backup`: Creates a backup on a Cloud SQL instance.
 
 ## Dataplex
 

docs/en/resources/tools/cloudsql/cloudsqlcreatebackup.md

@@ -0,0 +1,45 @@
+---
+title: cloud-sql-create-backup
+type: docs
+weight: 10
+description: "Creates a backup on a Cloud SQL instance."
+---
+
+The `cloud-sql-create-backup` tool creates an on-demand backup on a Cloud SQL instance using the Cloud SQL Admin API.
+
+{{< notice info dd>}}
+This tool uses a `source` of kind `cloud-sql-admin`.
+{{< /notice >}}
+
+## Examples
+
+Basic backup creation (current state)
+
+```yaml
+tools:
+  backup-creation-basic:
+    kind: cloud-sql-create-backup
+    source: cloud-sql-admin-source
+    description: "Creates a backup on the given Cloud SQL instance."
+```
+## Reference
+### Tool Configuration
+| **field**      | **type** | **required** | **description**                                               |
+| -------------- | :------: | :----------: | ------------------------------------------------------------- |
+| kind           | string   | true         | Must be "cloud-sql-create-backup".                            |
+| source         | string   | true         | The name of the `cloud-sql-admin` source to use.              |
+| description    | string   | false        | A description of the tool.                                    |
+
+### Tool Inputs
+
+| **parameter**              | **type** | **required** | **description**                                                                 |
+| -------------------------- | :------: | :----------: | ------------------------------------------------------------------------------- |
+| project                    | string   | true         | The project ID.                                                                 |
+| instance                   | string   | true         | The name of the instance to take a backup on. Does not include the project ID.  |
+| location                   | string   | false        | (Optional) Location of the backup run.                                          |
+| backup_description         | string   | false        | (Optional) The description of this backup run.                                  |
+
+## See Also
+- [Cloud SQL Admin API documentation](https://cloud.google.com/sql/docs/mysql/admin-api)
+- [Toolbox Cloud SQL tools documentation](../cloudsql)
+- [Cloud SQL Backup API documentation](https://cloud.google.com/sql/docs/mysql/backup-recovery/backups)

internal/prebuiltconfigs/tools/cloud-sql-mssql-admin.yaml

@@ -43,6 +43,9 @@ tools:
   clone_instance:
     kind: cloud-sql-clone-instance
     source: cloud-sql-admin-source
+  create_backup:
+    kind: cloud-sql-create-backup
+    source: cloud-sql-admin-source
 
 toolsets:
   cloud_sql_mssql_admin_tools:
@@ -54,3 +57,4 @@ toolsets:
     - create_user
     - wait_for_operation
     - clone_instance
+    - create_backup

internal/prebuiltconfigs/tools/cloud-sql-mysql-admin.yaml

@@ -43,6 +43,9 @@ tools:
   clone_instance:
     kind: cloud-sql-clone-instance
     source: cloud-sql-admin-source
+  create_backup:
+    kind: cloud-sql-create-backup
+    source: cloud-sql-admin-source
 
 toolsets:
   cloud_sql_mysql_admin_tools:
@@ -54,3 +57,4 @@ toolsets:
     - create_user
     - wait_for_operation
     - clone_instance
+    - create_backup

internal/prebuiltconfigs/tools/cloud-sql-postgres-admin.yaml

@@ -46,6 +46,9 @@ tools:
   postgres_upgrade_precheck:
     kind: postgres-upgrade-precheck
     source: cloud-sql-admin-source
+  create_backup:
+    kind: cloud-sql-create-backup
+    source: cloud-sql-admin-source
 
 toolsets:
   cloud_sql_postgres_admin_tools:
@@ -58,3 +61,4 @@ toolsets:
     - wait_for_operation
     - postgres_upgrade_precheck
     - clone_instance
+    - create_backup

internal/sources/cloudsqladmin/cloud_sql_admin.go

@@ -352,6 +352,28 @@ func (s *Source) GetWaitForOperations(ctx context.Context, service *sqladmin.Ser
 	return nil, nil
 }
 
+func (s *Source) InsertBackupRun(ctx context.Context, project, instance, location, backupDescription, accessToken string) (any, error) {
+	backupRun := &sqladmin.BackupRun{}
+	if location != "" {
+		backupRun.Location = location
+	}
+	if backupDescription != "" {
+		backupRun.Description = backupDescription
+	}
+
+	service, err := s.GetService(ctx, string(accessToken))
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := service.BackupRuns.Insert(project, instance, backupRun).Do()
+	if err != nil {
+		return nil, fmt.Errorf("error creating backup: %w", err)
+	}
+
+	return resp, nil
+}
+
 func generateCloudSQLConnectionMessage(ctx context.Context, source *Source, logger log.Logger, opResponse map[string]any, connectionMessageTemplate string) (string, bool) {
 	operationType, ok := opResponse["operationType"].(string)
 	if !ok || operationType != "CREATE_DATABASE" {

internal/tools/cloudsql/cloudsqlcreatebackup/cloudsqlcreatebackup.go

@@ -0,0 +1,180 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cloudsqlcreatebackup
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/goccy/go-yaml"
+	"github.com/googleapis/genai-toolbox/internal/embeddingmodels"
+	"github.com/googleapis/genai-toolbox/internal/sources"
+	"github.com/googleapis/genai-toolbox/internal/tools"
+	"github.com/googleapis/genai-toolbox/internal/util/parameters"
+	"google.golang.org/api/sqladmin/v1"
+)
+
+const kind string = "cloud-sql-create-backup"
+
+var _ tools.ToolConfig = Config{}
+
+type compatibleSource interface {
+	GetDefaultProject() string
+	GetService(context.Context, string) (*sqladmin.Service, error)
+	UseClientAuthorization() bool
+	InsertBackupRun(ctx context.Context, project, instance, location, backupDescription, accessToken string) (any, error)
+}
+
+// Config defines the configuration for the create-backup tool.
+type Config struct {
+	Name         string   `yaml:"name" validate:"required"`
+	Kind         string   `yaml:"kind" validate:"required"`
+	Description  string   `yaml:"description"`
+	Source       string   `yaml:"source" validate:"required"`
+	AuthRequired []string `yaml:"authRequired"`
+}
+
+func init() {
+	if !tools.Register(kind, newConfig) {
+		panic(fmt.Sprintf("tool kind %q already registered", kind))
+	}
+}
+
+func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (tools.ToolConfig, error) {
+	actual := Config{Name: name}
+	if err := decoder.DecodeContext(ctx, &actual); err != nil {
+		return nil, err
+	}
+	return actual, nil
+}
+
+// ToolConfigKind returns the kind of the tool.
+func (cfg Config) ToolConfigKind() string {
+	return kind
+}
+
+// Initialize initializes the tool from the configuration.
+func (cfg Config) Initialize(srcs map[string]sources.Source) (tools.Tool, error) {
+	rawS, ok := srcs[cfg.Source]
+	if !ok {
+		return nil, fmt.Errorf("no source named %q configured", cfg.Source)
+	}
+	s, ok := rawS.(compatibleSource)
+	if !ok {
+		return nil, fmt.Errorf("invalid source for %q tool: source %q not compatible", kind, cfg.Source)
+	}
+
+	project := s.GetDefaultProject()
+	var projectParam parameters.Parameter
+	if project != "" {
+		projectParam = parameters.NewStringParameterWithDefault("project", project, "The GCP project ID. This is pre-configured; do not ask for it unless the user explicitly provides a different one.")
+	} else {
+		projectParam = parameters.NewStringParameter("project", "The project ID")
+	}
+
+	allParameters := parameters.Parameters{
+		projectParam,
+		parameters.NewStringParameter("instance", "Cloud SQL instance ID. This does not include the project ID."),
+		// Location and backup_description are optional.
+		parameters.NewStringParameterWithRequired("location", "Location of the backup run.", false),
+		parameters.NewStringParameterWithRequired("backup_description", "The description of this backup run.", false),
+	}
+	paramManifest := allParameters.Manifest()
+
+	description := cfg.Description
+	if description == "" {
+		description = "Creates a backup on a Cloud SQL instance."
+	}
+
+	mcpManifest := tools.GetMcpManifest(cfg.Name, description, cfg.AuthRequired, allParameters, nil)
+
+	return Tool{
+		Config:      cfg,
+		AllParams:   allParameters,
+		manifest:    tools.Manifest{Description: description, Parameters: paramManifest, AuthRequired: cfg.AuthRequired},
+		mcpManifest: mcpManifest,
+	}, nil
+}
+
+// Tool represents the create-backup tool.
+type Tool struct {
+	Config
+	AllParams   parameters.Parameters `yaml:"allParams"`
+	manifest    tools.Manifest
+	mcpManifest tools.McpManifest
+}
+
+func (t Tool) ToConfig() tools.ToolConfig {
+	return t.Config
+}
+
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, error) {
+	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Kind)
+	if err != nil {
+		return nil, err
+	}
+	paramsMap := params.AsMap()
+
+	project, ok := paramsMap["project"].(string)
+	if !ok {
+		return nil, fmt.Errorf("error casting 'project' parameter: %v", paramsMap["project"])
+	}
+	instance, ok := paramsMap["instance"].(string)
+	if !ok {
+		return nil, fmt.Errorf("error casting 'instance' parameter: %v", paramsMap["instance"])
+	}
+
+	location, _ := paramsMap["location"].(string)
+	description, _ := paramsMap["backup_description"].(string)
+
+	return source.InsertBackupRun(ctx, project, instance, location, description, string(accessToken))
+}
+
+// ParseParams parses the parameters for the tool.
+func (t Tool) ParseParams(data map[string]any, claims map[string]map[string]any) (parameters.ParamValues, error) {
+	return parameters.ParseParams(t.AllParams, data, claims)
+}
+
+func (t Tool) EmbedParams(ctx context.Context, paramValues parameters.ParamValues, embeddingModelsMap map[string]embeddingmodels.EmbeddingModel) (parameters.ParamValues, error) {
+	return parameters.EmbedParams(ctx, t.AllParams, paramValues, embeddingModelsMap, nil)
+}
+
+// Manifest returns the tool's manifest.
+func (t Tool) Manifest() tools.Manifest {
+	return t.manifest
+}
+
+// McpManifest returns the tool's MCP manifest.
+func (t Tool) McpManifest() tools.McpManifest {
+	return t.mcpManifest
+}
+
+// Authorized checks if the tool is authorized.
+func (t Tool) Authorized(verifiedAuthServices []string) bool {
+	return true
+}
+
+func (t Tool) RequiresClientAuthorization(resourceMgr tools.SourceProvider) (bool, error) {
+	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Source, t.Name, t.Kind)
+	if err != nil {
+		return false, err
+	}
+
+	return source.UseClientAuthorization(), nil
+}
+
+func (t Tool) GetAuthTokenHeaderName(resourceMgr tools.SourceProvider) (string, error) {
+	return "Authorization", nil
+}

internal/tools/cloudsql/cloudsqlcreatebackup/cloudsqlcreatebackup_test.go

@@ -0,0 +1,72 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cloudsqlcreatebackup_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"
+	"github.com/googleapis/genai-toolbox/internal/tools/cloudsql/cloudsqlcreatebackup"
+)
+
+func TestParseFromYaml(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		want server.ToolConfigs
+	}{
+		{
+			desc: "basic example",
+			in: `
+			tools:
+			  create-backup-tool:
+			    kind: cloud-sql-create-backup
+			    description: a test description
+			    source: a-source
+			`,
+			want: server.ToolConfigs{
+				"create-backup-tool": cloudsqlcreatebackup.Config{
+					Name:         "create-backup-tool",
+					Kind:         "cloud-sql-create-backup",
+					Description:  "a test description",
+					Source:       "a-source",
+					AuthRequired: []string{},
+				},
+			},
+		},
+	}
+	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)
+			if err != nil {
+				t.Fatalf("unable to unmarshal: %s", err)
+			}
+			if diff := cmp.Diff(tc.want, got.Tools); diff != "" {
+				t.Fatalf("incorrect parse: diff %v", diff)
+			}
+		})
+	}
+}

tests/cloudsql/cloud_sql_create_backup_test.go

@@ -0,0 +1,232 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cloudsql
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"reflect"
+	"regexp"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/googleapis/genai-toolbox/internal/testutils"
+	"github.com/googleapis/genai-toolbox/tests"
+	"google.golang.org/api/sqladmin/v1"
+)
+
+var (
+	createBackupToolKind = "cloud-sql-create-backup"
+)
+
+type createBackupTransport struct {
+	transport http.RoundTripper
+	url       *url.URL
+}
+
+func (t *createBackupTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	if strings.HasPrefix(req.URL.String(), "https://sqladmin.googleapis.com") {
+		req.URL.Scheme = t.url.Scheme
+		req.URL.Host = t.url.Host
+	}
+	return t.transport.RoundTrip(req)
+}
+
+type mastercreateBackupHandler struct {
+	t *testing.T
+}
+
+func (h *mastercreateBackupHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if !strings.Contains(r.UserAgent(), "genai-toolbox/") {
+		h.t.Errorf("User-Agent header not found")
+	}
+	var backupRun sqladmin.BackupRun
+	if err := json.NewDecoder(r.Body).Decode(&backupRun); err != nil {
+		h.t.Fatalf("failed to decode request body: %v", err)
+	} else {
+		h.t.Logf("Received request body: %+v", backupRun)
+	}
+
+	var expectedBackupRun sqladmin.BackupRun
+	var response any
+	var statusCode int
+
+	switch backupRun.Description {
+	case "":
+		expectedBackupRun = sqladmin.BackupRun{}
+		response = map[string]any{"name": "op1", "status": "PENDING"}
+		statusCode = http.StatusOK
+	case "test desc":
+		expectedBackupRun = sqladmin.BackupRun{Location: "us-central1", Description: "test desc"}
+		response = map[string]any{"name": "op1", "status": "PENDING"}
+		statusCode = http.StatusOK
+	default:
+		http.Error(w, fmt.Sprintf("unhandled instance name: %s", backupRun.Instance), http.StatusInternalServerError)
+		return
+	}
+
+	if diff := cmp.Diff(expectedBackupRun, backupRun); diff != "" {
+		h.t.Errorf("unexpected request body (-want +got):\n%s", diff)
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(statusCode)
+	if err := json.NewEncoder(w).Encode(response); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func TestCreateBackupToolEndpoints(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+	defer cancel()
+
+	handler := &mastercreateBackupHandler{t: t}
+	server := httptest.NewServer(handler)
+	defer server.Close()
+
+	serverURL, err := url.Parse(server.URL)
+	if err != nil {
+		t.Fatalf("failed to parse server URL: %v", err)
+	}
+
+	originalTransport := http.DefaultClient.Transport
+	if originalTransport == nil {
+		originalTransport = http.DefaultTransport
+	}
+	http.DefaultClient.Transport = &createBackupTransport{
+		transport: originalTransport,
+		url:       serverURL,
+	}
+	t.Cleanup(func() {
+		http.DefaultClient.Transport = originalTransport
+	})
+
+	var args []string
+	toolsFile := getCreateBackupToolsConfig()
+	cmd, cleanup, err := tests.StartCmd(ctx, toolsFile, args...)
+	if err != nil {
+		t.Fatalf("command initialization returned an error: %s", err)
+	}
+	defer cleanup()
+
+	waitCtx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+	out, err := testutils.WaitForString(waitCtx, regexp.MustCompile(`Server ready to serve`), cmd.Out)
+	if err != nil {
+		t.Logf("toolbox command logs: \n%s", out)
+		t.Fatalf("toolbox didn't start successfully: %s", err)
+	}
+
+	tcs := []struct {
+		name        string
+		toolName    string
+		body        string
+		want        string
+		expectError bool
+		errorStatus int
+	}{
+		{
+			name:     "successful backup creation with no optional parameters",
+			toolName: "create-backup",
+			body:     `{"project": "p1", "instance": "instance-no-optional"}`,
+			want:     `{"name":"op1","status":"PENDING"}`,
+		},
+		{
+			name:     "successful backup creation with optional parameters",
+			toolName: "create-backup",
+			body:     `{"project": "p1", "instance": "instance-optional", "location": "us-central1", "backup_description": "test desc"}`,
+			want:     `{"name":"op1","status":"PENDING"}`,
+		},
+		{
+			name:        "missing instance name",
+			toolName:    "create-backup",
+			body:        `{"project": "p1", "escription": "invalid"}`,
+			expectError: true,
+			errorStatus: http.StatusBadRequest,
+		},
+	}
+
+	for _, tc := range tcs {
+		t.Run(tc.name, func(t *testing.T) {
+			api := fmt.Sprintf("http://127.0.0.1:5000/api/tool/%s/invoke", tc.toolName)
+			req, err := http.NewRequest(http.MethodPost, api, bytes.NewBufferString(tc.body))
+			if err != nil {
+				t.Fatalf("unable to create request: %s", err)
+			}
+			req.Header.Add("Content-type", "application/json")
+			resp, err := http.DefaultClient.Do(req)
+			if err != nil {
+				t.Fatalf("unable to send request: %s", err)
+			}
+			defer resp.Body.Close()
+
+			if tc.expectError {
+				if resp.StatusCode != tc.errorStatus {
+					bodyBytes, _ := io.ReadAll(resp.Body)
+					t.Fatalf("expected status %d but got %d: %s", tc.errorStatus, resp.StatusCode, string(bodyBytes))
+				}
+				return
+			}
+
+			if resp.StatusCode != http.StatusOK {
+				bodyBytes, _ := io.ReadAll(resp.Body)
+				t.Fatalf("response status code is not 200, got %d: %s", resp.StatusCode, string(bodyBytes))
+			}
+
+			var result struct {
+				Result string `json:"result"`
+			}
+			if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+				t.Fatalf("failed to decode response: %v", err)
+			}
+
+			var got, want map[string]any
+			if err := json.Unmarshal([]byte(result.Result), &got); err != nil {
+				t.Fatalf("failed to unmarshal result: %v", err)
+			}
+			if err := json.Unmarshal([]byte(tc.want), &want); err != nil {
+				t.Fatalf("failed to unmarshal want: %v", err)
+			}
+
+			if !reflect.DeepEqual(got, want) {
+				t.Fatalf("unexpected result: got %+v, want %+v", got, want)
+			}
+		})
+	}
+}
+
+func getCreateBackupToolsConfig() map[string]any {
+	return map[string]any{
+		"sources": map[string]any{
+			"my-cloud-sql-source": map[string]any{
+				"kind": "cloud-sql-admin",
+			},
+		},
+		"tools": map[string]any{
+			"create-backup": map[string]any{
+				"kind":   createBackupToolKind,
+				"source": "my-cloud-sql-source",
+			},
+		},
+	}
+}