diff --git a/packages/gateway-protocol/package.json b/packages/gateway-protocol/package.json
index 679ac1709446..5a997f7d2fba 100644
--- a/packages/gateway-protocol/package.json
+++ b/packages/gateway-protocol/package.json
@@ -78,7 +78,8 @@
     "prepack": "pnpm run build && node --import tsx ../../scripts/protocol-gen.ts --out ./protocol.schema.json"
   },
   "dependencies": {
-    "typebox": "1.3.6"
+    "typebox": "1.3.6",
+    "zod": "4.4.3"
   },
   "engines": {
     "node": ">=22.19.0"
diff --git a/packages/gateway-protocol/src/install-policy-warning-error-details.ts b/packages/gateway-protocol/src/install-policy-warning-error-details.ts
index 1b53746e573e..7241a11d2eb8 100644
--- a/packages/gateway-protocol/src/install-policy-warning-error-details.ts
+++ b/packages/gateway-protocol/src/install-policy-warning-error-details.ts
@@ -1,3 +1,5 @@
+import { z } from "zod";
+
 /** Structured install-policy warning details carried in Gateway error payloads. */
 export const INSTALL_POLICY_WARNING_ACKNOWLEDGEMENT_REQUIRED =
   "install_policy_warning_acknowledgement_required" as const;
@@ -19,3 +21,28 @@ export type InstallPolicyWarningErrorDetails = {
   reason: string;
   findings?: InstallPolicyWarningErrorFinding[];
 };
+
+const installPolicyWarningFindingSchema = z.object({
+  ruleId: z.string().trim().min(1),
+  severity: z.enum(["info", "warn", "critical"]),
+  message: z.string().trim().min(1),
+  file: z.string().trim().min(1).optional(),
+  line: z.number().int().positive().optional(),
+  evidence: z.string().trim().min(1).optional(),
+});
+
+const installPolicyWarningErrorDetailsSchema = z.object({
+  installPolicyCode: z.literal(INSTALL_POLICY_WARNING_ACKNOWLEDGEMENT_REQUIRED),
+  targetName: z.string().trim().min(1),
+  targetType: z.enum(["skill", "plugin"]),
+  requestMode: z.enum(["install", "update"]),
+  reason: z.string().trim().min(1),
+  findings: z.array(installPolicyWarningFindingSchema).optional(),
+});
+
+export function readInstallPolicyWarningErrorDetails(
+  value: unknown,
+): InstallPolicyWarningErrorDetails | undefined {
+  const parsed = installPolicyWarningErrorDetailsSchema.safeParse(value);
+  return parsed.success ? parsed.data : undefined;
+}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index dc69e89ec2b9..985f8a3a0b04 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -2231,6 +2231,9 @@ importers:
       typebox:
         specifier: 1.3.6
         version: 1.3.6
+      zod:
+        specifier: 4.4.3
+        version: 4.4.3
 
   packages/llm-core:
     dependencies:
diff --git a/src/gateway/install-policy-warning-error-details.ts b/src/gateway/install-policy-warning-error-details.ts
index 537613fa7521..90b50e6efdf0 100644
--- a/src/gateway/install-policy-warning-error-details.ts
+++ b/src/gateway/install-policy-warning-error-details.ts
@@ -1,30 +1 @@
-import { z } from "zod";
-import {
-  INSTALL_POLICY_WARNING_ACKNOWLEDGEMENT_REQUIRED,
-  type InstallPolicyWarningErrorDetails,
-} from "../../packages/gateway-protocol/src/install-policy-warning-error-details.js";
-
-const installPolicyWarningFindingSchema = z.object({
-  ruleId: z.string().trim().min(1),
-  severity: z.enum(["info", "warn", "critical"]),
-  message: z.string().trim().min(1),
-  file: z.string().trim().min(1).optional(),
-  line: z.number().int().positive().optional(),
-  evidence: z.string().trim().min(1).optional(),
-});
-
-const installPolicyWarningErrorDetailsSchema = z.object({
-  installPolicyCode: z.literal(INSTALL_POLICY_WARNING_ACKNOWLEDGEMENT_REQUIRED),
-  targetName: z.string().trim().min(1),
-  targetType: z.enum(["skill", "plugin"]),
-  requestMode: z.enum(["install", "update"]),
-  reason: z.string().trim().min(1),
-  findings: z.array(installPolicyWarningFindingSchema).optional(),
-});
-
-export function readInstallPolicyWarningErrorDetails(
-  value: unknown,
-): InstallPolicyWarningErrorDetails | undefined {
-  const parsed = installPolicyWarningErrorDetailsSchema.safeParse(value);
-  return parsed.success ? parsed.data : undefined;
-}
+export { readInstallPolicyWarningErrorDetails } from "../../packages/gateway-protocol/src/install-policy-warning-error-details.js";