diff --git a/inc/Cli/Commands/WorkspaceCommand.php b/inc/Cli/Commands/WorkspaceCommand.php
index 79a47bb..7c40c86 100644
--- a/inc/Cli/Commands/WorkspaceCommand.php
+++ b/inc/Cli/Commands/WorkspaceCommand.php
@@ -5886,7 +5886,7 @@ private function render_worktree_artifact_cleanup_result( array $result, array $
 
 		if ( $dry_run ) {
 			$apply_command = (string) ( $result['apply_command'] ?? $summary['apply_command'] ?? 'studio wp datamachine-code workspace cleanup run --mode=artifacts --format=json' );
-			WP_CLI::success(sprintf('%d artifact(s) would be removed. Apply this page with `%s`; --apply-plan remains a low-level escape hatch.', (int) ( $summary['would_remove_artifacts'] ?? 0 ), $apply_command));
+			WP_CLI::success(sprintf('%d artifact(s) would be removed. Apply reviewed artifact cleanup with `%s`; --apply-plan remains a low-level escape hatch.', (int) ( $summary['would_remove_artifacts'] ?? 0 ), $apply_command));
 			return;
 		}
 		WP_CLI::success(sprintf('Removed %d artifact(s); %d worktree(s) skipped.', (int) ( $summary['removed_artifacts'] ?? 0 ), count($skipped)));
diff --git a/inc/Workspace/WorkspaceArtifactCleanup.php b/inc/Workspace/WorkspaceArtifactCleanup.php
index 0c69b41..f334d4a 100644
--- a/inc/Workspace/WorkspaceArtifactCleanup.php
+++ b/inc/Workspace/WorkspaceArtifactCleanup.php
@@ -54,7 +54,8 @@ public function worktree_cleanup_artifacts( array $opts = array() ): array|\WP_E
 		if ( $exhaustive || $full_workspace ) {
 			$limit = 0;
 		}
-		$apply_command = $this->build_artifact_cleanup_apply_command();
+		$apply_command   = $this->build_artifact_cleanup_apply_command();
+		$preview_command = $this->build_artifact_cleanup_preview_command($opts);
 		// Apply paths default to safety probing (small subset). Dry-run defaults
 		// to skipping the per-worktree git probes unless explicitly requested or
 		// the caller asked for exhaustive mode.
@@ -67,7 +68,7 @@ public function worktree_cleanup_artifacts( array $opts = array() ): array|\WP_E
 		}
 
 		if ( ! $dry_run && null === $apply_plan ) {
-			return new \WP_Error('artifact_cleanup_plan_required', sprintf('Artifact cleanup applies through the high-level cleanup runner for daily cleanup. Run `%s` to apply the same bounded page, or use --dry-run first and --apply-plan=<file> only as a low-level escape hatch.', $apply_command), array( 'status' => 400 ));
+			return new \WP_Error('artifact_cleanup_plan_required', sprintf('Artifact cleanup applies through the high-level cleanup runner for daily cleanup. Run `%s` to apply reviewed artifact cleanup, or use --dry-run first and --apply-plan=<file> only as a low-level escape hatch.', $apply_command), array( 'status' => 400 ));
 		}
 
 		$only_handles = null;
@@ -141,13 +142,19 @@ public function worktree_cleanup_artifacts( array $opts = array() ): array|\WP_E
 
 		if ( $dry_run ) {
 			$response = array(
-				'success'       => true,
-				'dry_run'       => true,
-				'apply_command' => $apply_command,
-				'candidates'    => $candidates,
-				'removed'       => array(),
-				'skipped'       => $skipped,
-				'summary'       => array( 'apply_command' => $apply_command ) + $summary,
+				'success'               => true,
+				'dry_run'               => true,
+				'apply_command'         => $apply_command,
+				'preview_command'       => $preview_command,
+				'rerun_preview_command' => $preview_command,
+				'candidates'            => $candidates,
+				'removed'               => array(),
+				'skipped'               => $skipped,
+				'summary'               => array(
+					'apply_command'         => $apply_command,
+					'preview_command'       => $preview_command,
+					'rerun_preview_command' => $preview_command,
+				) + $summary,
 			);
 			if ( null !== $pagination ) {
 				$response['pagination'] = $pagination;
@@ -209,7 +216,37 @@ public function worktree_cleanup_artifacts( array $opts = array() ): array|\WP_E
 	 * @return string
 	 */
 	private function build_artifact_cleanup_apply_command(): string {
-		return 'studio wp datamachine-code workspace cleanup run --mode=artifacts --dry-run --format=json';
+		return 'studio wp datamachine-code workspace cleanup run --mode=artifacts';
+	}
+
+	/**
+	 * Build the preview command for the current artifact cleanup dry-run.
+	 *
+	 * @param  array<string,mixed> $opts Dry-run options.
+	 * @return string
+	 */
+	private function build_artifact_cleanup_preview_command( array $opts ): string {
+		$parts = array( 'studio wp datamachine-code workspace worktree cleanup-artifacts --dry-run' );
+		if ( ! empty($opts['force']) ) {
+			$parts[] = '--force';
+		}
+		if ( isset($opts['limit']) ) {
+			$parts[] = '--limit=' . (int) $opts['limit'];
+		}
+		if ( isset($opts['offset']) && (int) $opts['offset'] > 0 ) {
+			$parts[] = '--offset=' . (int) $opts['offset'];
+		}
+		if ( ! empty($opts['exhaustive']) ) {
+			$parts[] = '--exhaustive';
+		}
+		if ( ! empty($opts['safety_probes']) ) {
+			$parts[] = '--safety-probes';
+		}
+		if ( isset($opts['sort']) && '' !== trim( (string) $opts['sort']) ) {
+			$parts[] = '--sort=' . preg_replace('/[^a-z0-9_\-]/i', '', (string) $opts['sort']);
+		}
+		$parts[] = '--format=json';
+		return implode(' ', $parts);
 	}
 
 	/**
diff --git a/inc/Workspace/WorkspaceCleanupPlan.php b/inc/Workspace/WorkspaceCleanupPlan.php
index 381fcad..ebf74e5 100644
--- a/inc/Workspace/WorkspaceCleanupPlan.php
+++ b/inc/Workspace/WorkspaceCleanupPlan.php
@@ -69,6 +69,7 @@ public function workspace_cleanup_plan( array $opts = array() ): array|\WP_Error
 			if ( $artifact_plan instanceof \WP_Error ) {
 				return $artifact_plan;
 			}
+			$artifact_plan = $this->normalize_cleanup_plan_child_preview_commands($artifact_plan);
 		}
 
 		$worktree_plan = array(
@@ -376,6 +377,7 @@ private function build_cleanup_plan_summary( array $rows, array $blocked = array
 		$category_total  = array_sum(array_map('intval', $category_totals));
 
 		return array(
+			'apply_command'           => 'studio wp datamachine-code workspace cleanup apply <run-id>',
 			'total_rows'              => $total_rows,
 			'rows_by_type'            => $counts,
 			'byte_totals'             => $byte_totals,
@@ -390,6 +392,32 @@ private function build_cleanup_plan_summary( array $rows, array $blocked = array
 		);
 	}
 
+	/**
+	 * Keep embedded child dry-runs from advertising preview commands as applies.
+	 *
+	 * @param  array<string,mixed> $plan Child artifact cleanup plan.
+	 * @return array<string,mixed>
+	 */
+	private function normalize_cleanup_plan_child_preview_commands( array $plan ): array {
+		$preview_command = (string) ( $plan['preview_command'] ?? $plan['rerun_preview_command'] ?? $plan['apply_command'] ?? '' );
+		unset($plan['apply_command']);
+		if ( '' !== $preview_command ) {
+			$plan['preview_command']       = $preview_command;
+			$plan['rerun_preview_command'] = $preview_command;
+		}
+
+		if ( isset($plan['summary']) && is_array($plan['summary']) ) {
+			$summary_preview_command = (string) ( $plan['summary']['preview_command'] ?? $plan['summary']['rerun_preview_command'] ?? $plan['summary']['apply_command'] ?? $preview_command );
+			unset($plan['summary']['apply_command']);
+			if ( '' !== $summary_preview_command ) {
+				$plan['summary']['preview_command']       = $summary_preview_command;
+				$plan['summary']['rerun_preview_command'] = $summary_preview_command;
+			}
+		}
+
+		return $plan;
+	}
+
 	/**
 	 * Build operator continuation evidence from bounded child cleanup plans.
 	 *
diff --git a/tests/artifact-cleanup-plan-output-contract.php b/tests/artifact-cleanup-plan-output-contract.php
new file mode 100644
index 0000000..0a4bbbe
--- /dev/null
+++ b/tests/artifact-cleanup-plan-output-contract.php
@@ -0,0 +1,105 @@
+<?php
+
+declare(strict_types=1);
+
+if ( ! defined('ABSPATH') ) {
+	define('ABSPATH', __DIR__ . '/fixtures/');
+}
+
+require_once dirname(__DIR__) . '/vendor/autoload.php';
+require_once dirname(__DIR__) . '/inc/Workspace/WorkspaceCleanupPlan.php';
+
+use DataMachineCode\Workspace\WorkspaceCleanupPlan;
+
+function artifact_cleanup_plan_contract_assert( bool $condition, string $message ): void {
+	if ( ! $condition ) {
+		throw new RuntimeException($message);
+	}
+}
+
+final class ArtifactCleanupPlanContractWorkspace {
+	use WorkspaceCleanupPlan;
+
+	public const CLEANUP_PLAN_DEFAULT_LIMIT  = 100;
+	public const CLEANUP_PLAN_DEFAULT_BUDGET = '30s';
+
+	private string $workspace_path = '/tmp/dmc-artifact-cleanup-contract';
+
+	public function worktree_cleanup_artifacts( array $opts = array() ): array {
+		$preview_command = 'studio wp datamachine-code workspace cleanup run --mode=artifacts --dry-run --format=json';
+
+		return array(
+			'success'       => true,
+			'dry_run'       => true,
+			'apply_command' => $preview_command,
+			'candidates'    => array(
+				array(
+					'handle'              => 'repo@example',
+					'repo'                => 'repo',
+					'branch'              => 'example',
+					'path'                => '/tmp/dmc-artifact-cleanup-contract/repo@example',
+					'artifact_size_bytes' => 123,
+					'artifacts'           => array(
+						array(
+							'path'       => 'vendor',
+							'size_bytes' => 123,
+						),
+					),
+				),
+			),
+			'skipped'       => array(),
+			'summary'       => array(
+				'apply_command'          => $preview_command,
+				'would_remove_artifacts' => 1,
+				'artifact_size_bytes'    => 123,
+			),
+		);
+	}
+
+	public function worktree_cleanup_merged( array $opts = array() ): array {
+		return array(
+			'success'    => true,
+			'dry_run'    => true,
+			'candidates' => array(),
+			'skipped'    => array(),
+			'summary'    => array(),
+		);
+	}
+
+	private function stable_cleanup_hash( array $data, string $prefix ): string {
+		return $prefix . '-' . substr(hash('sha256', wp_json_encode($data)), 0, 12);
+	}
+}
+
+if ( ! function_exists('wp_json_encode') ) {
+	function wp_json_encode( $data, $options = 0, $depth = 512 ) {
+		return json_encode($data, $options, $depth);
+	}
+}
+
+$workspace = new ArtifactCleanupPlanContractWorkspace();
+$plan      = $workspace->workspace_cleanup_plan(array( 'include_worktrees' => false ));
+
+artifact_cleanup_plan_contract_assert(is_array($plan), 'cleanup plan should return an array');
+artifact_cleanup_plan_contract_assert(
+	'studio wp datamachine-code workspace cleanup apply <run-id>' === ( $plan['summary']['apply_command'] ?? '' ),
+	'cleanup plan summary should expose the authoritative apply command'
+);
+
+$artifact_plan = $plan['plans']['artifact_cleanup'] ?? array();
+artifact_cleanup_plan_contract_assert(! array_key_exists('apply_command', $artifact_plan), 'nested artifact plan should not expose apply_command');
+artifact_cleanup_plan_contract_assert(! array_key_exists('apply_command', $artifact_plan['summary'] ?? array()), 'nested artifact summary should not expose apply_command');
+artifact_cleanup_plan_contract_assert(
+	'studio wp datamachine-code workspace cleanup run --mode=artifacts --dry-run --format=json' === ( $artifact_plan['preview_command'] ?? '' ),
+	'nested artifact plan should expose preview_command'
+);
+artifact_cleanup_plan_contract_assert(
+	( $artifact_plan['preview_command'] ?? null ) === ( $artifact_plan['rerun_preview_command'] ?? null ),
+	'nested artifact plan should expose matching rerun_preview_command'
+);
+artifact_cleanup_plan_contract_assert(
+	( $artifact_plan['summary']['preview_command'] ?? null ) === ( $artifact_plan['summary']['rerun_preview_command'] ?? null ),
+	'nested artifact summary should expose matching preview commands'
+);
+
+fwrite(STDOUT, "artifact-cleanup-plan-output-contract ok\n");