diff --git a/scripts/e2e/telegram-user-crabbox-proof.ts b/scripts/e2e/telegram-user-crabbox-proof.ts
index d99acf9421f..f6513b91178 100644
--- a/scripts/e2e/telegram-user-crabbox-proof.ts
+++ b/scripts/e2e/telegram-user-crabbox-proof.ts
@@ -326,13 +326,20 @@ export function parseArgs(argvInput: string[]): Options {
     argv = argv.slice(0, commandSeparator);
   }
   let expectWasPassed = false;
+  const seenSingleValueOptions = new Set<string>();
   for (let index = 0; index < argv.length; index += 1) {
     const arg = argv[index];
-    const readValue = () => {
+    const readValue = (options: { repeatable?: boolean } = {}) => {
       const value = argv[index + 1];
       if (isMissingOptionValue(value)) {
         usage();
       }
+      if (!options.repeatable) {
+        if (seenSingleValueOptions.has(arg)) {
+          throw new Error(`${arg} was provided more than once`);
+        }
+        seenSingleValueOptions.add(arg);
+      }
       index += 1;
       return value;
     };
@@ -351,7 +358,7 @@ export function parseArgs(argvInput: string[]): Options {
         opts.expect = [];
         expectWasPassed = true;
       }
-      opts.expect.push(readValue());
+      opts.expect.push(readValue({ repeatable: true }));
     } else if (arg === "--gateway-port") {
       opts.gatewayPort = parseTcpPort(readValue(), "--gateway-port");
     } else if (arg === "--id") {
diff --git a/test/scripts/telegram-user-crabbox-proof.test.ts b/test/scripts/telegram-user-crabbox-proof.test.ts
index add26736f9e..e1ef84c7147 100644
--- a/test/scripts/telegram-user-crabbox-proof.test.ts
+++ b/test/scripts/telegram-user-crabbox-proof.test.ts
@@ -157,6 +157,17 @@ describe("telegram user Crabbox proof log polling", () => {
     expect(parseArgs(["--text", "-ping"]).text).toBe("-ping");
   });
 
+  it("rejects duplicate single-value proof controls while keeping repeated expectations", () => {
+    expect(() =>
+      parseArgs(["--output-dir", ".artifacts/one", "--output-dir", ".artifacts/two"]),
+    ).toThrow("--output-dir was provided more than once");
+
+    expect(parseArgs(["--expect", "OpenClaw", "--expect", "ready"]).expect).toEqual([
+      "OpenClaw",
+      "ready",
+    ]);
+  });
+
   it("uses unique default output dirs", () => {
     const firstOutputDir = parseArgs([]).outputDir;
     const secondOutputDir = parseArgs([]).outputDir;