Add PreferWriteOnlyAttribute() validators to resourcevalidator and all value validator packages.

.changes/unreleased/FEATURES-20250206-120903.yaml

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+kind: FEATURES
+body: 'boolvalidator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:09:03.733715-05:00
+custom:
+    Issue: "263"

.changes/unreleased/FEATURES-20250206-121130.yaml

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+kind: FEATURES
+body: 'dynamicvalidator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:11:30.572285-05:00
+custom:
+    Issue: "263"

.changes/unreleased/FEATURES-20250206-121159.yaml

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+kind: FEATURES
+body: 'float32validator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:11:59.137017-05:00
+custom:
+    Issue: "263"

.changes/unreleased/FEATURES-20250206-121224.yaml

@@ -0,0 +1,5 @@
+kind: FEATURES
+body: 'float64validator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:12:24.396457-05:00
+custom:
+    Issue: "263"

.changes/unreleased/FEATURES-20250206-121243.yaml

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+kind: FEATURES
+body: 'int32validator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:12:43.521669-05:00
+custom:
+    Issue: "263"

.changes/unreleased/FEATURES-20250206-121308.yaml

@@ -0,0 +1,5 @@
+kind: FEATURES
+body: 'int64validator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:13:08.483387-05:00
+custom:
+    Issue: "263"

.changes/unreleased/FEATURES-20250206-121402.yaml

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+kind: FEATURES
+body: 'listvalidator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:14:02.302221-05:00
+custom:
+    Issue: "263"

.changes/unreleased/FEATURES-20250206-121418.yaml

@@ -0,0 +1,5 @@
+kind: FEATURES
+body: 'mapvalidator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:14:18.324953-05:00
+custom:
+    Issue: "263"

.changes/unreleased/FEATURES-20250206-121440.yaml

@@ -0,0 +1,5 @@
+kind: FEATURES
+body: 'numbervalidator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:14:40.942642-05:00
+custom:
+    Issue: "263"

.changes/unreleased/FEATURES-20250206-121500.yaml

@@ -0,0 +1,5 @@
+kind: FEATURES
+body: 'objectvalidator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:15:00.176757-05:00
+custom:
+    Issue: "263"

.changes/unreleased/FEATURES-20250206-121519.yaml

@@ -0,0 +1,5 @@
+kind: FEATURES
+body: 'resourcevalidator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:15:19.618622-05:00
+custom:
+    Issue: "263"

.changes/unreleased/FEATURES-20250206-121533.yaml

@@ -0,0 +1,5 @@
+kind: FEATURES
+body: 'setvalidator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:15:33.908556-05:00
+custom:
+    Issue: "263"

.changes/unreleased/FEATURES-20250206-121553.yaml

@@ -0,0 +1,5 @@
+kind: FEATURES
+body: 'stringvalidator: Added `PreferWriteOnlyAttribute` validator'
+time: 2025-02-06T12:15:53.337804-05:00
+custom:
+    Issue: "263"

boolvalidator/prefer_write_only_attribute.go

@@ -0,0 +1,28 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package boolvalidator
+
+import (
+	"github.com/hashicorp/terraform-plugin-framework/path"
+	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
+
+	"github.com/hashicorp/terraform-plugin-framework-validators/internal/schemavalidator"
+)
+
+// PreferWriteOnlyAttribute returns a warning if the Terraform client supports
+// write-only attributes, and the attribute that the validator is applied to has a value.
+// It takes in a path.Expression that represents the write-only attribute schema location,
+// and the warning message will indicate that the write-only attribute should be preferred.
+//
+// This validator should only be used for resource attributes as other schema types do not
+// support write-only attributes.
+//
+// This implements the validation logic declaratively within the schema.
+// Refer to [resourcevalidator.PreferWriteOnlyAttribute]
+// for declaring this type of validation outside the schema definition.
+func PreferWriteOnlyAttribute(writeOnlyAttribute path.Expression) validator.Bool {
+	return schemavalidator.PreferWriteOnlyAttribute{
+		WriteOnlyAttribute: writeOnlyAttribute,
+	}
+}

boolvalidator/prefer_write_only_attribute_example_test.go

@@ -0,0 +1,34 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package boolvalidator_test
+
+import (
+	"github.com/hashicorp/terraform-plugin-framework/path"
+	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
+	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
+
+	"github.com/hashicorp/terraform-plugin-framework-validators/boolvalidator"
+)
+
+func ExamplePreferWriteOnlyAttribute() {
+	// Used within a Schema method of a Resource
+	_ = schema.Schema{
+		Attributes: map[string]schema.Attribute{
+			"example_attr": schema.BoolAttribute{
+				Optional: true,
+				Validators: []validator.Bool{
+					// Throws a warning diagnostic encouraging practitioners to use
+					// write_only_attr if example_attr has a value.
+					boolvalidator.PreferWriteOnlyAttribute(
+						path.MatchRoot("write_only_attr"),
+					),
+				},
+			},
+			"write_only_attr": schema.BoolAttribute{
+				WriteOnly: true,
+				Optional:  true,
+			},
+		},
+	}
+}

dynamicvalidator/prefer_write_only_attribute.go

@@ -0,0 +1,28 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package dynamicvalidator
+
+import (
+	"github.com/hashicorp/terraform-plugin-framework/path"
+	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
+
+	"github.com/hashicorp/terraform-plugin-framework-validators/internal/schemavalidator"
+)
+
+// PreferWriteOnlyAttribute returns a warning if the Terraform client supports
+// write-only attributes, and the attribute that the validator is applied to has a value.
+// It takes in a path.Expression that represents the write-only attribute schema location,
+// and the warning message will indicate that the write-only attribute should be preferred.
+//
+// This validator should only be used for resource attributes as other schema types do not
+// support write-only attributes.
+//
+// This implements the validation logic declaratively within the schema.
+// Refer to [resourcevalidator.PreferWriteOnlyAttribute]
+// for declaring this type of validation outside the schema definition.
+func PreferWriteOnlyAttribute(writeOnlyAttribute path.Expression) validator.Dynamic {
+	return schemavalidator.PreferWriteOnlyAttribute{
+		WriteOnlyAttribute: writeOnlyAttribute,
+	}
+}

dynamicvalidator/prefer_write_only_attribute_example_test.go

@@ -0,0 +1,34 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package dynamicvalidator_test
+
+import (
+	"github.com/hashicorp/terraform-plugin-framework/path"
+	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
+	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
+
+	"github.com/hashicorp/terraform-plugin-framework-validators/dynamicvalidator"
+)
+
+func ExamplePreferWriteOnlyAttribute() {
+	// Used within a Schema method of a Resource
+	_ = schema.Schema{
+		Attributes: map[string]schema.Attribute{
+			"example_attr": schema.DynamicAttribute{
+				Optional: true,
+				Validators: []validator.Dynamic{
+					// Throws a warning diagnostic encouraging practitioners to use
+					// write_only_attr if example_attr has a value.
+					dynamicvalidator.PreferWriteOnlyAttribute(
+						path.MatchRoot("write_only_attr"),
+					),
+				},
+			},
+			"write_only_attr": schema.DynamicAttribute{
+				WriteOnly: true,
+				Optional:  true,
+			},
+		},
+	}
+}

float32validator/prefer_write_only_attribute.go

@@ -0,0 +1,28 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package float32validator
+
+import (
+	"github.com/hashicorp/terraform-plugin-framework/path"
+	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
+
+	"github.com/hashicorp/terraform-plugin-framework-validators/internal/schemavalidator"
+)
+
+// PreferWriteOnlyAttribute returns a warning if the Terraform client supports
+// write-only attributes, and the attribute that the validator is applied to has a value.
+// It takes in a path.Expression that represents the write-only attribute schema location,
+// and the warning message will indicate that the write-only attribute should be preferred.
+//
+// This validator should only be used for resource attributes as other schema types do not
+// support write-only attributes.
+//
+// This implements the validation logic declaratively within the schema.
+// Refer to [resourcevalidator.PreferWriteOnlyAttribute]
+// for declaring this type of validation outside the schema definition.
+func PreferWriteOnlyAttribute(writeOnlyAttribute path.Expression) validator.Float32 {
+	return schemavalidator.PreferWriteOnlyAttribute{
+		WriteOnlyAttribute: writeOnlyAttribute,
+	}
+}

float32validator/prefer_write_only_attribute_example_test.go

@@ -0,0 +1,34 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package float32validator_test
+
+import (
+	"github.com/hashicorp/terraform-plugin-framework/path"
+	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
+	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
+
+	"github.com/hashicorp/terraform-plugin-framework-validators/float32validator"
+)
+
+func ExamplePreferWriteOnlyAttribute() {
+	// Used within a Schema method of a Resource
+	_ = schema.Schema{
+		Attributes: map[string]schema.Attribute{
+			"example_attr": schema.Float32Attribute{
+				Optional: true,
+				Validators: []validator.Float32{
+					// Throws a warning diagnostic encouraging practitioners to use
+					// write_only_attr if example_attr has a value.
+					float32validator.PreferWriteOnlyAttribute(
+						path.MatchRoot("write_only_attr"),
+					),
+				},
+			},
+			"write_only_attr": schema.Float32Attribute{
+				WriteOnly: true,
+				Optional:  true,
+			},
+		},
+	}
+}

float64validator/prefer_write_only_attribute.go

@@ -0,0 +1,28 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package float64validator
+
+import (
+	"github.com/hashicorp/terraform-plugin-framework/path"
+	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
+
+	"github.com/hashicorp/terraform-plugin-framework-validators/internal/schemavalidator"
+)
+
+// PreferWriteOnlyAttribute returns a warning if the Terraform client supports
+// write-only attributes, and the attribute that the validator is applied to has a value.
+// It takes in a path.Expression that represents the write-only attribute schema location,
+// and the warning message will indicate that the write-only attribute should be preferred.
+//
+// This validator should only be used for resource attributes as other schema types do not
+// support write-only attributes.
+//
+// This implements the validation logic declaratively within the schema.
+// Refer to [resourcevalidator.PreferWriteOnlyAttribute]
+// for declaring this type of validation outside the schema definition.
+func PreferWriteOnlyAttribute(writeOnlyAttribute path.Expression) validator.Float64 {
+	return schemavalidator.PreferWriteOnlyAttribute{
+		WriteOnlyAttribute: writeOnlyAttribute,
+	}
+}

float64validator/prefer_write_only_attribute_example_test.go

@@ -0,0 +1,34 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package float64validator_test
+
+import (
+	"github.com/hashicorp/terraform-plugin-framework/path"
+	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
+	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
+
+	"github.com/hashicorp/terraform-plugin-framework-validators/float64validator"
+)
+
+func ExamplePreferWriteOnlyAttribute() {
+	// Used within a Schema method of a Resource
+	_ = schema.Schema{
+		Attributes: map[string]schema.Attribute{
+			"example_attr": schema.Float64Attribute{
+				Optional: true,
+				Validators: []validator.Float64{
+					// Throws a warning diagnostic encouraging practitioners to use
+					// write_only_attr if example_attr has a value.
+					float64validator.PreferWriteOnlyAttribute(
+						path.MatchRoot("write_only_attr"),
+					),
+				},
+			},
+			"write_only_attr": schema.Float64Attribute{
+				WriteOnly: true,
+				Optional:  true,
+			},
+		},
+	}
+}

int32validator/prefer_write_only_attribute.go

@@ -0,0 +1,28 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package int32validator
+
+import (
+	"github.com/hashicorp/terraform-plugin-framework/path"
+	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
+
+	"github.com/hashicorp/terraform-plugin-framework-validators/internal/schemavalidator"
+)
+
+// PreferWriteOnlyAttribute returns a warning if the Terraform client supports
+// write-only attributes, and the attribute that the validator is applied to has a value.
+// It takes in a path.Expression that represents the write-only attribute schema location,
+// and the warning message will indicate that the write-only attribute should be preferred.
+//
+// This validator should only be used for resource attributes as other schema types do not
+// support write-only attributes.
+//
+// This implements the validation logic declaratively within the schema.
+// Refer to [resourcevalidator.PreferWriteOnlyAttribute]
+// for declaring this type of validation outside the schema definition.
+func PreferWriteOnlyAttribute(writeOnlyAttribute path.Expression) validator.Int32 {
+	return schemavalidator.PreferWriteOnlyAttribute{
+		WriteOnlyAttribute: writeOnlyAttribute,
+	}
+}

int32validator/prefer_write_only_attribute_example_test.go

@@ -0,0 +1,34 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package int32validator_test
+
+import (
+	"github.com/hashicorp/terraform-plugin-framework/path"
+	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
+	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
+
+	"github.com/hashicorp/terraform-plugin-framework-validators/int32validator"
+)
+
+func ExamplePreferWriteOnlyAttribute() {
+	// Used within a Schema method of a Resource
+	_ = schema.Schema{
+		Attributes: map[string]schema.Attribute{
+			"example_attr": schema.Int32Attribute{
+				Optional: true,
+				Validators: []validator.Int32{
+					// Throws a warning diagnostic encouraging practitioners to use
+					// write_only_attr if example_attr has a value.
+					int32validator.PreferWriteOnlyAttribute(
+						path.MatchRoot("write_only_attr"),
+					),
+				},
+			},
+			"write_only_attr": schema.Int32Attribute{
+				WriteOnly: true,
+				Optional:  true,
+			},
+		},
+	}
+}