diff --git a/src/ai/acp-transport.ts b/src/ai/acp-transport.ts
index d85a320a4..aab99f0e3 100644
--- a/src/ai/acp-transport.ts
+++ b/src/ai/acp-transport.ts
@@ -56,6 +56,24 @@ export function buildCrashChunks(
   return { chunks, shouldNullSession: true }
 }
 
+interface AcpDebugEntry {
+  ts: number
+  type: string
+  data: unknown
+}
+
+export const acpDebugLog: AcpDebugEntry[] = []
+
+export function getAcpDebugText(): string {
+  return acpDebugLog.map((e) =>
+    `[${new Date(e.ts).toISOString()}] ${e.type}\n${JSON.stringify(e.data, null, 2)}`
+  ).join('\n\n---\n\n')
+}
+
+export function clearAcpDebugLog() {
+  acpDebugLog.length = 0
+}
+
 export class ACPChatTransport implements ChatTransport<UIMessage> {
   private session: ACPSession | null = null
   private agentDef: ACPAgentDef
@@ -114,7 +132,11 @@ export class ACPChatTransport implements ChatTransport<UIMessage> {
 
         session.onUpdate = (params) => {
           if (closed) return
-          console.debug('[ACP update]', params.update.sessionUpdate, params.update)
+          acpDebugLog.push({
+            ts: Date.now(),
+            type: params.update.sessionUpdate,
+            data: params.update
+          })
           const result = mapUpdate(params.update, textId, textStarted)
           for (const chunk of result.chunks) {
             controller.enqueue(chunk)
diff --git a/src/components/ChatPanel.vue b/src/components/ChatPanel.vue
index d4c18f472..67eac88f7 100644
--- a/src/components/ChatPanel.vue
+++ b/src/components/ChatPanel.vue
@@ -2,6 +2,7 @@
 import { ScrollAreaRoot, ScrollAreaScrollbar, ScrollAreaThumb, ScrollAreaViewport } from 'reka-ui'
 import { computed, markRaw, nextTick, ref, watch } from 'vue'
 
+import { getAcpDebugText, clearAcpDebugLog } from '@/ai/acp-transport'
 import { copyChatLog } from '@/ai/chat-debug'
 import { clearToolLogEntries, didHitStepLimit } from '@/ai/tools'
 import AcpPermissionDialog from '@/components/chat/AcpPermissionDialog.vue'
@@ -24,6 +25,7 @@ ensureChat().then((c) => {
 })
 const messagesEnd = ref<HTMLDivElement>()
 const debugCopied = ref(false)
+const acpLogCopied = ref(false)
 const initError = ref<string | null>(null)
 
 const messages = computed(() => chat.value?.messages ?? [])
@@ -86,10 +88,19 @@ async function handleCopyDebug() {
   }, 1500)
 }
 
+async function handleCopyAcpLog() {
+  const text = getAcpDebugText()
+  if (!text) return
+  await navigator.clipboard.writeText(text)
+  acpLogCopied.value = true
+  setTimeout(() => { acpLogCopied.value = false }, 1500)
+}
+
 function handleClearChat() {
   chat.value = null
   resetChat()
   clearToolLogEntries()
+  clearAcpDebugLog()
 }
 </script>
 
@@ -170,6 +181,14 @@ function handleClearChat() {
           <icon-lucide-check v-else class="size-3 text-green-400" />
           {{ debugCopied ? 'Copied' : 'Copy log' }}
         </button>
+        <button
+          class="flex items-center gap-1 rounded px-1.5 py-0.5 text-[10px] text-muted hover:bg-hover hover:text-surface"
+          @click="handleCopyAcpLog"
+        >
+          <icon-lucide-bug v-if="!acpLogCopied" class="size-3" />
+          <icon-lucide-check v-else class="size-3 text-green-400" />
+          {{ acpLogCopied ? 'Copied' : 'ACP log' }}
+        </button>
         <button
           class="flex items-center gap-1 rounded px-1.5 py-0.5 text-[10px] text-muted hover:bg-hover hover:text-surface"
           @click="handleClearChat"