diff --git a/src/agents/bash-tools.exec.ts b/src/agents/bash-tools.exec.ts
index 32655f6a9..3d58bc705 100644
--- a/src/agents/bash-tools.exec.ts
+++ b/src/agents/bash-tools.exec.ts
@@ -896,8 +896,8 @@ export function createExecTool(
                   security: hostSecurity,
                   ask: hostAsk,
                   agentId: defaults?.agentId,
-                  resolvedPath: null,
-                  sessionKey: defaults?.sessionKey ?? null,
+                  resolvedPath: undefined,
+                  sessionKey: defaults?.sessionKey,
                   timeoutMs: DEFAULT_APPROVAL_TIMEOUT_MS,
                 },
               )) as { decision?: string } | null;
@@ -1060,7 +1060,7 @@ export function createExecTool(
           const approvalSlug = createApprovalSlug(approvalId);
           const expiresAtMs = Date.now() + DEFAULT_APPROVAL_TIMEOUT_MS;
           const contextKey = `exec:${approvalId}`;
-          const resolvedPath = analysis.segments[0]?.resolution?.resolvedPath ?? null;
+          const resolvedPath = analysis.segments[0]?.resolution?.resolvedPath;
           const noticeSeconds = Math.max(1, Math.round(approvalRunningNoticeMs / 1000));
           const commandText = params.command;
           const effectiveTimeout =
@@ -1082,7 +1082,7 @@ export function createExecTool(
                   ask: hostAsk,
                   agentId: defaults?.agentId,
                   resolvedPath,
-                  sessionKey: defaults?.sessionKey ?? null,
+                  sessionKey: defaults?.sessionKey,
                   timeoutMs: DEFAULT_APPROVAL_TIMEOUT_MS,
                 },
               )) as { decision?: string } | null;
diff --git a/src/cli/nodes-cli/register.invoke.ts b/src/cli/nodes-cli/register.invoke.ts
index 4cad89315..9a9ff2834 100644
--- a/src/cli/nodes-cli/register.invoke.ts
+++ b/src/cli/nodes-cli/register.invoke.ts
@@ -267,8 +267,8 @@ export function registerNodesInvokeCommands(nodes: Command) {
               security: hostSecurity,
               ask: hostAsk,
               agentId,
-              resolvedPath: null,
-              sessionKey: null,
+              resolvedPath: undefined,
+              sessionKey: undefined,
               timeoutMs: 120_000,
             })) as { decision?: string } | null;
             const decision =
diff --git a/src/gateway/server-methods/exec-approval.test.ts b/src/gateway/server-methods/exec-approval.test.ts
index 4682e6e1a..8142b281f 100644
--- a/src/gateway/server-methods/exec-approval.test.ts
+++ b/src/gateway/server-methods/exec-approval.test.ts
@@ -1,10 +1,54 @@
 import { describe, expect, it, vi } from "vitest";
 import { ExecApprovalManager } from "../exec-approval-manager.js";
 import { createExecApprovalHandlers } from "./exec-approval.js";
+import { validateExecApprovalRequestParams } from "../protocol/index.js";
 
 const noop = () => {};
 
 describe("exec approval handlers", () => {
+  describe("ExecApprovalRequestParams validation", () => {
+    it("accepts request with resolvedPath omitted", () => {
+      const params = {
+        command: "echo hi",
+        cwd: "/tmp",
+        host: "node",
+      };
+      expect(validateExecApprovalRequestParams(params)).toBe(true);
+    });
+
+    it("accepts request with resolvedPath as string", () => {
+      const params = {
+        command: "echo hi",
+        cwd: "/tmp",
+        host: "node",
+        resolvedPath: "/usr/bin/echo",
+      };
+      expect(validateExecApprovalRequestParams(params)).toBe(true);
+    });
+
+    it("accepts request with resolvedPath as undefined", () => {
+      const params = {
+        command: "echo hi",
+        cwd: "/tmp",
+        host: "node",
+        resolvedPath: undefined,
+      };
+      expect(validateExecApprovalRequestParams(params)).toBe(true);
+    });
+
+    // This documents the TypeBox/AJV behavior that caused the Discord exec bug:
+    // Type.Optional(Type.String()) does NOT accept null, only string or undefined.
+    it("rejects request with resolvedPath as null", () => {
+      const params = {
+        command: "echo hi",
+        cwd: "/tmp",
+        host: "node",
+        resolvedPath: null,
+      };
+      expect(validateExecApprovalRequestParams(params)).toBe(false);
+    });
+  });
+
   it("broadcasts request + resolve", async () => {
     const manager = new ExecApprovalManager();
     const handlers = createExecApprovalHandlers(manager);