diff --git a/apps/web/src/components/admin/DispoImportClient.tsx b/apps/web/src/components/admin/DispoImportClient.tsx
index 7182e39..1e78c74 100644
--- a/apps/web/src/components/admin/DispoImportClient.tsx
+++ b/apps/web/src/components/admin/DispoImportClient.tsx
@@ -65,6 +65,133 @@ const WORKBOOK_LABELS: { key: string; label: string; placeholder: string }[] = [
   { key: "roles", label: "Roles Workbook", placeholder: "/data/dispo/roles.xlsx" },
 ];
 
+type ReadinessReport = {
+  assignmentCount: number;
+  availabilityRuleCount: number;
+  canCommitWithFallbacks: boolean;
+  canCommitWithStrictSourceData: boolean;
+  fallbackAssumptions: string[];
+  issues: {
+    code: string;
+    count: number;
+    message: string;
+    resolution: string;
+    severity: "blocker" | "warning";
+  }[];
+  projectCount: number;
+  resourceCount: number;
+  unresolvedCount: number;
+  vacationCount: number;
+};
+
+function ReadinessReportPanel({ report }: { report: ReadinessReport }) {
+  const blockers = report.issues.filter((i) => i.severity === "blocker");
+  const warnings = report.issues.filter((i) => i.severity === "warning");
+
+  return (
+    <div className="mt-4 rounded-lg border border-gray-200 dark:border-gray-600 bg-gray-50 dark:bg-gray-800/50 p-4 space-y-3">
+      {/* Status line */}
+      {report.canCommitWithStrictSourceData ? (
+        <p className="text-sm font-medium text-green-700 dark:text-green-400">
+          Ready to stage — no blockers found.
+        </p>
+      ) : report.canCommitWithFallbacks ? (
+        <p className="text-sm font-medium text-amber-700 dark:text-amber-400">
+          Can stage with fallback assumptions applied.
+        </p>
+      ) : (
+        <p className="text-sm font-medium text-red-700 dark:text-red-400">
+          Blockers present — resolve before staging.
+        </p>
+      )}
+
+      {/* Counts */}
+      <div className="flex flex-wrap gap-x-4 gap-y-1 text-xs text-gray-600 dark:text-gray-400">
+        <span>{report.resourceCount} resources</span>
+        <span>{report.projectCount} projects</span>
+        <span>{report.assignmentCount} assignments</span>
+        <span>{report.vacationCount} vacations</span>
+        {report.unresolvedCount > 0 && (
+          <span className="text-amber-600 dark:text-amber-400 font-medium">
+            {report.unresolvedCount} unresolved
+          </span>
+        )}
+      </div>
+
+      {/* Blockers */}
+      {blockers.length > 0 && (
+        <div className="space-y-1">
+          {blockers.map((issue) => (
+            <div
+              key={issue.code}
+              className="rounded bg-red-50 dark:bg-red-900/20 border border-red-200 dark:border-red-800 px-3 py-2"
+            >
+              <p className="text-xs font-medium text-red-700 dark:text-red-400">
+                {issue.message}
+                {issue.count > 1 && (
+                  <span className="ml-1 font-normal">({issue.count})</span>
+                )}
+              </p>
+              <p className="text-xs text-red-600/80 dark:text-red-300/70 mt-0.5">
+                {issue.resolution}
+              </p>
+            </div>
+          ))}
+        </div>
+      )}
+
+      {/* Warnings */}
+      {warnings.length > 0 && (
+        <div className="space-y-1">
+          {warnings.map((issue) => (
+            <div
+              key={issue.code}
+              className="rounded bg-amber-50 dark:bg-amber-900/20 border border-amber-200 dark:border-amber-800 px-3 py-2"
+            >
+              <p className="text-xs font-medium text-amber-700 dark:text-amber-400">
+                {issue.message}
+                {issue.count > 1 && (
+                  <span className="ml-1 font-normal">({issue.count})</span>
+                )}
+              </p>
+              <p className="text-xs text-amber-600/80 dark:text-amber-300/70 mt-0.5">
+                {issue.resolution}
+              </p>
+            </div>
+          ))}
+        </div>
+      )}
+
+      {/* Fallback assumptions */}
+      {report.fallbackAssumptions.length > 0 && (
+        <div>
+          <p className="text-xs font-medium text-gray-500 dark:text-gray-400 mb-1">
+            Fallback assumptions:
+          </p>
+          <ul className="space-y-0.5">
+            {report.fallbackAssumptions.map((assumption, i) => (
+              <li key={i} className="text-xs text-gray-500 dark:text-gray-400 pl-2 border-l-2 border-gray-300 dark:border-gray-600">
+                {assumption}
+              </li>
+            ))}
+          </ul>
+        </div>
+      )}
+    </div>
+  );
+}
+
+function buildValidateInput(filePaths: Record<string, string>) {
+  const get = (key: string) => filePaths[key]?.trim() ?? "";
+  return {
+    referenceWorkbookPath: get("resources"),
+    planningWorkbookPath: get("projects"),
+    chargeabilityWorkbookPath: get("assignments"),
+    ...(get("vacations") ? { rosterWorkbookPath: get("vacations") } : {}),
+    ...(get("roles") ? { costWorkbookPath: get("roles") } : {}),
+  };
+}
+
 function NewImportModal({
   open,
   onClose,
@@ -76,6 +203,12 @@ function NewImportModal({
 }) {
   const [filePaths, setFilePaths] = useState<Record<string, string>>({});
   const [error, setError] = useState<string | null>(null);
+  const [validateInput, setValidateInput] = useState<ReturnType<typeof buildValidateInput> | null>(null);
+
+  const validateQuery = trpc.dispo.validateImportBatch.useQuery(
+    validateInput ?? { referenceWorkbookPath: "", planningWorkbookPath: "", chargeabilityWorkbookPath: "" },
+    { enabled: validateInput !== null, retry: false },
+  );
 
   const stageMutation = trpc.dispo.stageImportBatch.useMutation({
     onSuccess: () => {
@@ -83,30 +216,51 @@ function NewImportModal({
       onClose();
       setFilePaths({});
       setError(null);
+      setValidateInput(null);
     },
     onError: (err) => setError(err.message),
   });
 
+  function hasRequiredPaths() {
+    const get = (key: string) => (filePaths[key] ?? "").trim();
+    return get("resources").length > 0 && get("projects").length > 0 && get("assignments").length > 0;
+  }
+
+  function handleValidate() {
+    setError(null);
+    setValidateInput(buildValidateInput(filePaths));
+  }
+
   function handleSubmit() {
     setError(null);
-    const nonEmpty = Object.fromEntries(
-      Object.entries(filePaths).filter(([, v]) => v.trim().length > 0),
-    );
-    if (Object.keys(nonEmpty).length === 0) {
+    const get = (key: string) => (filePaths[key] ?? "").trim();
+    const referenceWorkbookPath = get("resources");
+    const planningWorkbookPath = get("projects");
+    const chargeabilityWorkbookPath = get("assignments");
+    const rosterWorkbookPath = get("vacations");
+    const costWorkbookPath = get("roles");
+
+    if (!referenceWorkbookPath && !planningWorkbookPath && !chargeabilityWorkbookPath) {
       setError("Provide at least one workbook path.");
       return;
     }
     stageMutation.mutate({
-      referenceWorkbookPath: (nonEmpty as Record<string, string>).referenceWorkbookPath ?? "",
-      planningWorkbookPath: (nonEmpty as Record<string, string>).planningWorkbookPath ?? "",
-      chargeabilityWorkbookPath: (nonEmpty as Record<string, string>).chargeabilityWorkbookPath ?? "",
-      ...(nonEmpty.rosterWorkbookPath ? { rosterWorkbookPath: nonEmpty.rosterWorkbookPath } : {}),
-      ...(nonEmpty.costWorkbookPath ? { costWorkbookPath: nonEmpty.costWorkbookPath } : {}),
+      referenceWorkbookPath,
+      planningWorkbookPath,
+      chargeabilityWorkbookPath,
+      ...(rosterWorkbookPath ? { rosterWorkbookPath } : {}),
+      ...(costWorkbookPath ? { costWorkbookPath } : {}),
     } as any);
   }
 
+  function handleClose() {
+    setValidateInput(null);
+    setError(null);
+    onClose();
+  }
+
   return (
-    <AnimatedModal open={open} onClose={onClose} maxWidth="max-w-lg">
+    <AnimatedModal open={open} onClose={handleClose} maxWidth="max-w-lg">
       <div className="px-6 py-5">
         <h2 className="text-lg font-semibold text-gray-900 dark:text-gray-100 mb-4">
           New Dispo Import
@@ -123,22 +277,43 @@ function NewImportModal({
                 className="w-full rounded-lg border border-gray-300 px-3 py-2 text-sm dark:border-gray-600 dark:bg-gray-700 dark:text-gray-100 focus:ring-2 focus:ring-brand-500 focus:border-brand-500"
                 placeholder={placeholder}
                 value={filePaths[key] ?? ""}
-                onChange={(e) =>
-                  setFilePaths((prev) => ({ ...prev, [key]: e.target.value }))
-                }
+                onChange={(e) => {
+                  setFilePaths((prev) => ({ ...prev, [key]: e.target.value }));
+                  setValidateInput(null);
+                }}
               />
             </div>
           ))}
         </div>
 
+        {/* Validation report */}
+        {validateQuery.isFetching && (
+          <p className="mt-4 text-sm text-gray-500 dark:text-gray-400">Validating…</p>
+        )}
+        {!validateQuery.isFetching && validateQuery.data && (
+          <ReadinessReportPanel report={validateQuery.data as ReadinessReport} />
+        )}
+        {validateQuery.error && (
+          <p className="mt-3 text-sm text-red-600 dark:text-red-400">
+            Validation failed: {validateQuery.error.message}
+          </p>
+        )}
+
         {error && (
           <p className="mt-3 text-sm text-red-600 dark:text-red-400">{error}</p>
         )}
 
         <div className="flex justify-end gap-3 mt-6">
-          <Button variant="secondary" onClick={onClose}>
+          <Button variant="secondary" onClick={handleClose}>
             Cancel
           </Button>
+          <Button
+            variant="secondary"
+            onClick={handleValidate}
+            disabled={!hasRequiredPaths() || validateQuery.isFetching}
+          >
+            {validateQuery.isFetching ? "Validating…" : "Validate"}
+          </Button>
           <Button
             onClick={handleSubmit}
             disabled={stageMutation.isPending}