diff --git a/src/cli/managedCommands.ts b/src/cli/managedCommands.ts
index f922b9532b..eee4eae5a0 100644
--- a/src/cli/managedCommands.ts
+++ b/src/cli/managedCommands.ts
@@ -16,6 +16,7 @@ import { logCliCommand } from "../cliLogging.js";
 import type { Logger } from "pino";
 import type { CliInstance } from "./types.js";
 import { registerProjectManagedApplicationGraph } from "./managedProjectGraphCommand.js";
+import { managedMembersInputSchema } from "../contracts/managed/managedToolContracts.js";
 
 export const registerManagedCommands = (
   cli: CliInstance,
@@ -60,12 +61,9 @@ const registerInspectManagedMembers = (
       path: z.string().describe("Managed PE executable or assembly path"),
     }),
     options: z.object({
-      type: z
-        .array(z.string())
-        .optional()
-        .describe(
-          "Inspect only members declared by this exact type full name, such as System.Threading.Monitor; a nested type is named by its bare name, which selects every nested type of that name (repeatable)",
-        ),
+      type: managedMembersInputSchema.shape.type_names.describe(
+        "Inspect only members declared by this exact type full name, such as System.Threading.Monitor; a nested type is named by its bare name, which selects every nested type of that name (repeatable)",
+      ),
     }),
     run: ({ args, options }) =>
       logCliCommand(logger, "inspect-managed-members", () =>
diff --git a/tests/acceptance/managedCliOutput.test.ts b/tests/acceptance/managedCliOutput.test.ts
index d8a4bb998f..a24020d601 100644
--- a/tests/acceptance/managedCliOutput.test.ts
+++ b/tests/acceptance/managedCliOutput.test.ts
@@ -177,6 +177,38 @@ cliTest(
   },
 );
 
+cliTest(
+  "managed CLI rejects repeated or empty type selections as invalid input",
+  async ({ cli }) => {
+    const root = await createTestTempDirectory("rea-managed-cli-types-");
+    const path = join(root, "fixture.dll");
+    await writeFile(path, buildManagedPeFixture());
+    for (const [types, message] of [
+      [["Fixture.Empty0", "Fixture.Empty0"], "must not repeat a name"],
+      [[""], ">=1 characters"],
+    ] as const) {
+      const result = await cli.run({
+        arguments: [
+          "inspect-managed-members",
+          path,
+          ...types.flatMap((type) => ["--type", type]),
+          "--json",
+        ],
+      });
+      expect(result.exitCode).toBe(1);
+      expect(result.json).toMatchObject({
+        code: "VALIDATION_ERROR",
+        fieldErrors: [
+          expect.objectContaining({
+            path: expect.stringMatching(/^type/u),
+            message: expect.stringContaining(message),
+          }),
+        ],
+      });
+    }
+  },
+);
+
 cliTest(
   "managed CLI bounds CIL claims by section virtual ranges",
   async ({ cli }) => {