diff --git a/prometeu-packer/prometeu-packer-v1/src/main/java/p/packer/services/FileSystemPackerWorkspaceService.java b/prometeu-packer/prometeu-packer-v1/src/main/java/p/packer/services/FileSystemPackerWorkspaceService.java
index a717a49d..701bc568 100644
--- a/prometeu-packer/prometeu-packer-v1/src/main/java/p/packer/services/FileSystemPackerWorkspaceService.java
+++ b/prometeu-packer/prometeu-packer-v1/src/main/java/p/packer/services/FileSystemPackerWorkspaceService.java
@@ -9,8 +9,10 @@ import p.packer.PackerWorkspaceService;
 import p.packer.events.PackerEventKind;
 import p.packer.events.PackerEventSink;
 import p.packer.events.PackerProgress;
+import p.packer.dtos.PackerDiagnosticDTO;
 import p.packer.dtos.PackerPackSummaryAssetDTO;
 import p.packer.dtos.PackerPackSummaryDTO;
+import p.packer.dtos.PackerPackValidationAssetDTO;
 import p.packer.messages.*;
 import p.packer.messages.assets.*;
 import p.packer.messages.diagnostics.PackerDiagnosticCategory;
@@ -158,7 +160,20 @@ public final class FileSystemPackerWorkspaceService implements PackerWorkspaceSe
 
     @Override
     public ValidatePackWorkspaceResult validatePackWorkspace(ValidatePackWorkspaceRequest request) {
-        throw new UnsupportedOperationException("pack workspace validation is not implemented yet");
+        final PackerProjectContext project = Objects.requireNonNull(request, "request").project();
+        final PackerRuntimeSnapshot snapshot = runtimeRegistry.getOrLoad(project).snapshot();
+        final List<PackerPackValidationAssetDTO> blockedAssets = snapshot.assets().stream()
+                .filter(runtimeAsset -> runtimeAsset.registryEntry().isPresent() && runtimeAsset.registryEntry().get().includedInBuild())
+                .map(this::toPackValidationAssetDTO)
+                .filter(PackerPackValidationAssetDTO::blocked)
+                .toList();
+        final PackerOperationStatus status = blockedAssets.isEmpty()
+                ? PackerOperationStatus.SUCCESS
+                : PackerOperationStatus.PARTIAL;
+        final String summary = blockedAssets.isEmpty()
+                ? "Pack validation completed without blocking diagnostics."
+                : "Pack validation found blocking diagnostics in " + blockedAssets.size() + " included assets.";
+        return new ValidatePackWorkspaceResult(status, summary, blockedAssets);
     }
 
     @Override
@@ -677,6 +692,29 @@ public final class FileSystemPackerWorkspaceService implements PackerWorkspaceSe
                 0L);
     }
 
+    private PackerPackValidationAssetDTO toPackValidationAssetDTO(PackerRuntimeAsset runtimeAsset) {
+        final PackerRegistryEntry registryEntry = runtimeAsset.registryEntry()
+                .orElseThrow(() -> new IllegalArgumentException("pack validation asset must be registered"));
+        final PackerAssetDeclarationParseResult parsed = runtimeAsset.parsedDeclaration();
+        final PackerAssetDeclaration declaration = parsed.declaration();
+        final String assetName = declaration != null
+                ? declaration.name()
+                : runtimeAsset.assetRoot().getFileName().toString();
+        final List<PackerDiagnostic> blockingDiagnostics = Stream.of(
+                        parsed.diagnostics(),
+                        runtimeAsset.walkDiagnostics(),
+                        identityMismatchDiagnostics(registryEntry, parsed, runtimeAsset.manifestPath()))
+                .flatMap(Collection::stream)
+                .filter(PackerDiagnostic::blocking)
+                .toList();
+        return new PackerPackValidationAssetDTO(
+                registryEntry.assetId(),
+                assetName,
+                runtimeAsset.assetRoot(),
+                0L,
+                PackerReadMessageMapper.toDiagnosticDTOs(blockingDiagnostics));
+    }
+
     private void saveRuntimeCache(PackerProjectContext project, PackerRuntimeSnapshot snapshot) {
         cacheRepository.save(project, snapshot.cacheState());
     }
diff --git a/prometeu-packer/prometeu-packer-v1/src/test/java/p/packer/services/FileSystemPackerWorkspaceServiceTest.java b/prometeu-packer/prometeu-packer-v1/src/test/java/p/packer/services/FileSystemPackerWorkspaceServiceTest.java
index 4131e12a..46fc87f2 100644
--- a/prometeu-packer/prometeu-packer-v1/src/test/java/p/packer/services/FileSystemPackerWorkspaceServiceTest.java
+++ b/prometeu-packer/prometeu-packer-v1/src/test/java/p/packer/services/FileSystemPackerWorkspaceServiceTest.java
@@ -140,6 +140,61 @@ final class FileSystemPackerWorkspaceServiceTest {
         assertEquals(0L, result.packSummary().assets().getFirst().lastModified());
     }
 
+    @Test
+    void packValidationReturnsGreenWhenIncludedRegisteredAssetsHaveNoBlockers() throws Exception {
+        final Path projectRoot = copyFixture("workspaces/managed-basic", tempDir.resolve("pack-validation-green"));
+        final FileSystemPackerWorkspaceService service = service();
+
+        final var result = service.validatePackWorkspace(new ValidatePackWorkspaceRequest(project(projectRoot)));
+
+        assertEquals(PackerOperationStatus.SUCCESS, result.status());
+        assertTrue(result.canPack());
+        assertTrue(result.assets().isEmpty());
+    }
+
+    @Test
+    void packValidationReturnsBlockingDiagnosticsPerIncludedAsset() throws Exception {
+        final Path projectRoot = copyFixture("workspaces/managed-basic", tempDir.resolve("pack-validation-blocked"));
+        final Path manifestPath = projectRoot.resolve("assets/ui/atlas/asset.json");
+        final ObjectNode manifest = (ObjectNode) MAPPER.readTree(manifestPath.toFile());
+        manifest.remove("name");
+        MAPPER.writerWithDefaultPrettyPrinter().writeValue(manifestPath.toFile(), manifest);
+        final FileSystemPackerWorkspaceService service = service();
+
+        final var result = service.validatePackWorkspace(new ValidatePackWorkspaceRequest(project(projectRoot)));
+
+        assertEquals(PackerOperationStatus.PARTIAL, result.status());
+        assertFalse(result.canPack());
+        assertEquals(1, result.assets().size());
+        assertEquals(1, result.assets().getFirst().assetId());
+        assertEquals("atlas", result.assets().getFirst().assetName());
+        assertEquals(projectRoot.resolve("assets/ui/atlas").toAbsolutePath().normalize(), result.assets().getFirst().assetPath());
+        assertEquals(0L, result.assets().getFirst().lastModified());
+        assertTrue(result.assets().getFirst().diagnostics().stream().allMatch(diagnostic -> diagnostic.blocking()));
+        assertTrue(result.assets().getFirst().diagnostics().stream()
+                .anyMatch(diagnostic -> diagnostic.message().contains("Field 'name' must be a non-blank string")));
+    }
+
+    @Test
+    void packValidationIgnoresRegisteredAssetsExcludedFromBuild() throws Exception {
+        final Path projectRoot = copyFixture("workspaces/managed-basic", tempDir.resolve("pack-validation-excluded"));
+        final Path registryPath = projectRoot.resolve("assets/.prometeu/index.json");
+        final ObjectNode registry = (ObjectNode) MAPPER.readTree(registryPath.toFile());
+        ((ObjectNode) registry.path("assets").get(0)).put("included_in_build", false);
+        MAPPER.writerWithDefaultPrettyPrinter().writeValue(registryPath.toFile(), registry);
+        final Path manifestPath = projectRoot.resolve("assets/ui/atlas/asset.json");
+        final ObjectNode manifest = (ObjectNode) MAPPER.readTree(manifestPath.toFile());
+        manifest.remove("name");
+        MAPPER.writerWithDefaultPrettyPrinter().writeValue(manifestPath.toFile(), manifest);
+        final FileSystemPackerWorkspaceService service = service();
+
+        final var result = service.validatePackWorkspace(new ValidatePackWorkspaceRequest(project(projectRoot)));
+
+        assertEquals(PackerOperationStatus.SUCCESS, result.status());
+        assertTrue(result.canPack());
+        assertTrue(result.assets().isEmpty());
+    }
+
     @Test
     void createsRegisteredAssetAndWritesManifest() throws Exception {
         final Path projectRoot = tempDir.resolve("created");