diff --git a/extensions/codex/src/app-server/dynamic-tools.test.ts b/extensions/codex/src/app-server/dynamic-tools.test.ts
index 0f28ecf6412..417332288ec 100644
--- a/extensions/codex/src/app-server/dynamic-tools.test.ts
+++ b/extensions/codex/src/app-server/dynamic-tools.test.ts
@@ -1,4 +1,9 @@
 import type { AgentToolResult } from "openclaw/plugin-sdk/agent-core";
+import {
+  onInternalDiagnosticEvent,
+  waitForDiagnosticEventsDrained,
+  type DiagnosticEventPayload,
+} from "openclaw/plugin-sdk/diagnostic-runtime";
 import type { AnyAgentTool } from "openclaw/plugin-sdk/agent-harness";
 import {
   HEARTBEAT_RESPONSE_TOOL_NAME,
@@ -293,18 +298,33 @@ describe("createCodexDynamicToolBridge", () => {
 
   it("quarantines dynamic tools with unsupported input schemas", async () => {
     const warn = vi.spyOn(embeddedAgentLog, "warn").mockImplementation(() => undefined);
+    const diagnosticEvents: DiagnosticEventPayload[] = [];
+    const unsubscribeDiagnostics = onInternalDiagnosticEvent((event) =>
+      diagnosticEvents.push(event),
+    );
     const badExecute = vi.fn();
-    const bridge = createCodexDynamicToolBridge({
-      tools: [
-        createTool({ name: "message" }),
-        createTool({
-          name: "dofbot_move_angles",
-          parameters: { type: "array", items: { type: "number" } },
-          execute: badExecute,
-        }),
-      ],
-      signal: new AbortController().signal,
-    });
+    let bridge!: ReturnType<typeof createCodexDynamicToolBridge>;
+    try {
+      bridge = createCodexDynamicToolBridge({
+        tools: [
+          createTool({ name: "message" }),
+          createTool({
+            name: "dofbot_move_angles",
+            parameters: { type: "array", items: { type: "number" } },
+            execute: badExecute,
+          }),
+        ],
+        signal: new AbortController().signal,
+        hookContext: {
+          runId: "run-1",
+          sessionId: "session-1",
+          sessionKey: "agent:main:session-1",
+        },
+      });
+      await waitForDiagnosticEventsDrained();
+    } finally {
+      unsubscribeDiagnostics();
+    }
 
     expect(bridge.availableSpecs.map((tool) => tool.name)).toEqual(["message"]);
     expect(bridge.specs.map((tool) => tool.name)).toEqual(["message"]);
@@ -325,6 +345,23 @@ describe("createCodexDynamicToolBridge", () => {
         ],
       }),
     );
+    const blockedEvents = diagnosticEvents.filter(
+      (
+        event,
+      ): event is Extract<DiagnosticEventPayload, { type: "tool.execution.blocked" }> =>
+        event.type === "tool.execution.blocked",
+    );
+    expect(blockedEvents).toContainEqual(
+      expect.objectContaining({
+        type: "tool.execution.blocked",
+        runId: "run-1",
+        sessionId: "session-1",
+        sessionKey: "agent:main:session-1",
+        toolName: "dofbot_move_angles",
+        deniedReason: "unsupported_tool_schema",
+        reason: 'dofbot_move_angles.inputSchema.type must be "object"',
+      }),
+    );
 
     const result = await bridge.handleToolCall({
       threadId: "thread-1",
diff --git a/extensions/codex/src/app-server/dynamic-tools.ts b/extensions/codex/src/app-server/dynamic-tools.ts
index 606050cf597..d30743c3e03 100644
--- a/extensions/codex/src/app-server/dynamic-tools.ts
+++ b/extensions/codex/src/app-server/dynamic-tools.ts
@@ -1,4 +1,5 @@
 import type { AgentToolResult } from "openclaw/plugin-sdk/agent-core";
+import { emitTrustedDiagnosticEvent } from "openclaw/plugin-sdk/diagnostic-runtime";
 import {
   createAgentToolResultMiddlewareRunner,
   createCodexAppServerToolResultExtensionRunner,
@@ -118,6 +119,7 @@ export function createCodexDynamicToolBridge(params: {
     ...registeredProjection.quarantinedTools,
   ]);
   warnQuarantinedDynamicTools(quarantinedTools);
+  emitQuarantinedDynamicToolDiagnostics(quarantinedTools, params.hookContext);
   const telemetry: CodexDynamicToolBridge["telemetry"] = {
     didSendViaMessagingTool: false,
     messagingToolSentTexts: [],
@@ -337,6 +339,23 @@ function warnQuarantinedDynamicTools(tools: readonly CodexDynamicToolSchemaQuara
   );
 }
 
+function emitQuarantinedDynamicToolDiagnostics(
+  tools: readonly CodexDynamicToolSchemaQuarantine[],
+  ctx: CodexDynamicToolHookContext | undefined,
+): void {
+  for (const tool of tools) {
+    emitTrustedDiagnosticEvent({
+      type: "tool.execution.blocked",
+      runId: ctx?.runId,
+      sessionId: ctx?.sessionId,
+      sessionKey: ctx?.sessionKey,
+      toolName: tool.tool,
+      deniedReason: "unsupported_tool_schema",
+      reason: tool.violations.join(", "),
+    });
+  }
+}
+
 function dedupeQuarantinedDynamicTools(
   tools: readonly CodexDynamicToolSchemaQuarantine[],
 ): CodexDynamicToolSchemaQuarantine[] {