diff --git a/schema/architecture_integration_test.go b/schema/architecture_integration_test.go
new file mode 100644
index 0000000..254e566
--- /dev/null
+++ b/schema/architecture_integration_test.go
@@ -0,0 +1,178 @@
+/*
+ *     Copyright 2025 The CNCF ModelPack Authors
+ *
+ * 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 schema_test
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"strings"
+	"testing"
+
+	"github.com/modelpack/model-spec/schema"
+)
+
+// convertHFToArchConfig simulates HuggingFace config to architecture_config conversion.
+func convertHFToArchConfig(hfConfig map[string]interface{}) (map[string]interface{}, error) {
+	mappings := map[string]string{
+		"numLayers":         "num_hidden_layers",
+		"hiddenSize":        "hidden_size",
+		"numAttentionHeads": "num_attention_heads",
+	}
+
+	archConfig := map[string]interface{}{
+		"type": "transformer",
+	}
+
+	for archKey, hfKey := range mappings {
+		val, ok := hfConfig[hfKey]
+		if !ok {
+			return nil, fmt.Errorf("missing required field: %s", hfKey)
+		}
+		numVal, ok := val.(float64)
+		if !ok {
+			return nil, fmt.Errorf("field %s must be a number", hfKey)
+		}
+		if numVal != float64(int(numVal)) {
+			return nil, fmt.Errorf("field %s must be an integer", hfKey)
+		}
+		if numVal < 1 {
+			return nil, fmt.Errorf("field %s must be >= 1", hfKey)
+		}
+		archConfig[archKey] = int(numVal)
+	}
+
+	return archConfig, nil
+}
+
+// TestArchitectureIntegrationValidConversion tests the full conversion pipeline:
+// HF config → architecture_config → embedded in Model JSON → schema validation.
+func TestArchitectureIntegrationValidConversion(t *testing.T) {
+	// Step 1: Simulate HuggingFace config.json
+	hfConfig := map[string]interface{}{
+		"num_hidden_layers":   float64(32),
+		"hidden_size":         float64(4096),
+		"num_attention_heads": float64(32),
+		"vocab_size":          float64(32000),
+	}
+
+	// Step 2: Convert to architecture_config format
+	archConfig, err := convertHFToArchConfig(hfConfig)
+	if err != nil {
+		t.Fatalf("conversion failed: %v", err)
+	}
+
+	// Verify conversion output structure
+	if archConfig["type"] != "transformer" {
+		t.Errorf("expected type=transformer, got %v", archConfig["type"])
+	}
+	if archConfig["numLayers"] != 32 {
+		t.Errorf("expected numLayers=32, got %v", archConfig["numLayers"])
+	}
+	if archConfig["hiddenSize"] != 4096 {
+		t.Errorf("expected hiddenSize=4096, got %v", archConfig["hiddenSize"])
+	}
+	if archConfig["numAttentionHeads"] != 32 {
+		t.Errorf("expected numAttentionHeads=32, got %v", archConfig["numAttentionHeads"])
+	}
+
+	// Step 3: Build full Model JSON that includes architecture_config
+	modelData := map[string]interface{}{
+		"descriptor": map[string]interface{}{
+			"name": "test-model",
+		},
+		"config": map[string]interface{}{
+			"paramSize":           "8b",
+			"architecture_config": archConfig,
+		},
+		"modelfs": map[string]interface{}{
+			"type":    "layers",
+			"diffIds": []string{"sha256:1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"},
+		},
+	}
+
+	modelBytes, err := json.Marshal(modelData)
+	if err != nil {
+		t.Fatalf("failed to marshal model JSON: %v", err)
+	}
+
+	// Step 4: Validate complete Model with embedded architecture_config
+	// depends on architecture_config schema (PR-1)
+	err = schema.ValidatorMediaTypeModelConfig.Validate(bytes.NewReader(modelBytes))
+	if err != nil {
+		// Expected to fail until PR-1 (architecture_config schema) is merged
+		t.Logf("Model validation with architecture_config failed as expected: %v", err)
+
+		// Verify the failure is specifically about architecture_config not being allowed
+		if !strings.Contains(err.Error(), "architecture_config") {
+			t.Errorf("Expected validation to fail due to architecture_config field, but got: %v", err)
+		}
+		return
+	}
+}
+
+// TestArchitectureIntegrationMissingHFField tests conversion fails for missing required field.
+func TestArchitectureIntegrationMissingHFField(t *testing.T) {
+	// HF config missing num_hidden_layers
+	hfConfig := map[string]interface{}{
+		"hidden_size":         float64(4096),
+		"num_attention_heads": float64(32),
+	}
+
+	_, err := convertHFToArchConfig(hfConfig)
+	if err == nil {
+		t.Fatal("expected conversion to fail for missing num_hidden_layers")
+	}
+	if !strings.Contains(err.Error(), "num_hidden_layers") {
+		t.Errorf("error should mention missing field, got: %v", err)
+	}
+}
+
+// TestArchitectureIntegrationInvalidModelStructure tests schema rejects invalid Model structure.
+func TestArchitectureIntegrationInvalidModelStructure(t *testing.T) {
+	// Model missing required 'config' field
+	invalidJSON := `{
+		"descriptor": {"name": "test-model"},
+		"modelfs": {
+			"type": "layers",
+			"diffIds": ["sha256:1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"]
+		}
+	}`
+
+	err := schema.ValidatorMediaTypeModelConfig.Validate(strings.NewReader(invalidJSON))
+	if err == nil {
+		t.Fatal("expected validation to fail for missing config field")
+	}
+}
+
+// TestArchitectureIntegrationInvalidFieldValue tests conversion rejects invalid values.
+func TestArchitectureIntegrationInvalidFieldValue(t *testing.T) {
+	// Zero value for num_hidden_layers
+	hfConfig := map[string]interface{}{
+		"num_hidden_layers":   float64(0),
+		"hidden_size":         float64(4096),
+		"num_attention_heads": float64(32),
+	}
+
+	_, err := convertHFToArchConfig(hfConfig)
+	if err == nil {
+		t.Fatal("expected conversion to fail for zero value")
+	}
+	if !strings.Contains(err.Error(), ">= 1") {
+		t.Errorf("error should mention minimum value, got: %v", err)
+	}
+}