diff --git a/src/main/codex/codex-structured-journal-translation.test.ts b/src/main/codex/codex-structured-journal-translation.test.ts
index 852e32500b2..623403c6c4c 100644
--- a/src/main/codex/codex-structured-journal-translation.test.ts
+++ b/src/main/codex/codex-structured-journal-translation.test.ts
@@ -469,6 +469,39 @@ describe('codex journal translation', () => {
     expect(timeline).toEqual([])
   })
 
+  it('renders a system error carried by a suppressed status kind', () => {
+    const { translator, tap } = translatorWith()
+
+    translator.handle(
+      notification('thread/status/changed', {
+        threadId: THREAD_ID,
+        status: { type: 'systemError' }
+      })
+    )
+
+    const timeline = projectStructuredItemsToNativeChat(
+      tap.rows.map((row, index) => ({
+        itemId: row.key,
+        revision: 1,
+        sequence: index + 1,
+        observedAt: index + 1,
+        body: row.body
+      }))
+    )
+    expect(timeline).toEqual([
+      expect.objectContaining({
+        role: 'system',
+        blocks: [
+          expect.objectContaining({
+            providerFrame: expect.objectContaining({
+              kind: 'notification:thread/status/changed'
+            })
+          })
+        ]
+      })
+    ])
+  })
+
   it('writes nothing more after dispose', () => {
     const { translator, tap, window } = translatorWith()
 
diff --git a/src/main/native-chat/agent-session-wire/provider-frame-disposition.ts b/src/main/native-chat/agent-session-wire/provider-frame-disposition.ts
index 838b7af9155..f284efda051 100644
--- a/src/main/native-chat/agent-session-wire/provider-frame-disposition.ts
+++ b/src/main/native-chat/agent-session-wire/provider-frame-disposition.ts
@@ -1,5 +1,50 @@
 export type ProviderFrameDisposition = 'debug-only' | 'timeline'
 
+const ERROR_VARIANT_KEYS = new Set(['type', 'status', 'state', 'subtype', 'outcome'])
+const ERROR_VALUE_KEYS = new Set(['error', 'failureReason', 'failure_reason'])
+
+function isErrorVariant(value: unknown): boolean {
+  if (typeof value !== 'string') {
+    return false
+  }
+  const normalized = value.replace(/[_\s-]/g, '').toLowerCase()
+  return (
+    normalized.startsWith('error') || normalized.startsWith('fail') || normalized === 'systemerror'
+  )
+}
+
+function hasProviderError(payload: unknown): boolean {
+  const pending = [payload]
+  const seen = new WeakSet<object>()
+  while (pending.length > 0) {
+    const value = pending.pop()
+    if (typeof value !== 'object' || value === null || seen.has(value)) {
+      continue
+    }
+    seen.add(value)
+    if (Array.isArray(value)) {
+      pending.push(...value)
+      continue
+    }
+    for (const [key, nested] of Object.entries(value)) {
+      if ((key === 'isError' || key === 'is_error') && nested === true) {
+        return true
+      }
+      if (key === 'success' && nested === false) {
+        return true
+      }
+      if (ERROR_VARIANT_KEYS.has(key) && isErrorVariant(nested)) {
+        return true
+      }
+      if (ERROR_VALUE_KEYS.has(key) && nested !== null && nested !== false && nested !== '') {
+        return true
+      }
+      pending.push(nested)
+    }
+  }
+  return false
+}
+
 function notificationKind(kind: string): string {
   return kind.startsWith('notification:') ? kind.slice('notification:'.length) : kind
 }
@@ -27,11 +72,25 @@ function isClaudeStatusFrame(kind: string): boolean {
   )
 }
 
-export function classifyProviderFrame(provider: string, kind: string): ProviderFrameDisposition {
+export function classifyProviderFrame(
+  provider: string,
+  kind: string,
+  payload: unknown
+): ProviderFrameDisposition {
+  if (hasProviderError(payload)) {
+    return 'timeline'
+  }
   if (provider === 'codex' && isCodexStatusFrame(kind)) {
     return 'debug-only'
   }
   if (provider === 'claude' && isClaudeStatusFrame(kind)) {
+    if (kind === 'message:result') {
+      const record =
+        typeof payload === 'object' && payload !== null
+          ? (payload as Record<string, unknown>)
+          : null
+      return record?.subtype === 'success' ? 'debug-only' : 'timeline'
+    }
     return 'debug-only'
   }
   return 'timeline'
diff --git a/src/main/native-chat/agent-session-wire/unhandled-provider-frame.test.ts b/src/main/native-chat/agent-session-wire/unhandled-provider-frame.test.ts
index 70a10947d54..d3701122547 100644
--- a/src/main/native-chat/agent-session-wire/unhandled-provider-frame.test.ts
+++ b/src/main/native-chat/agent-session-wire/unhandled-provider-frame.test.ts
@@ -1,4 +1,5 @@
 import { describe, expect, it } from 'vitest'
+import { projectStructuredItemToNativeChat } from '../../../shared/structured-agent-session-projection'
 import { unhandledProviderFrameJournalItem } from './unhandled-provider-frame'
 
 describe('unhandled provider frame journal fallback', () => {
@@ -63,7 +64,72 @@ describe('unhandled provider frame journal fallback', () => {
       unhandledProviderFrameJournalItem('codex', 'notification:thread/goal/cleared', {})
     ).toBeNull()
     expect(unhandledProviderFrameJournalItem('claude', 'message:system:init', {})).toBeNull()
-    expect(unhandledProviderFrameJournalItem('claude', 'message:result', {})).toBeNull()
+    expect(
+      unhandledProviderFrameJournalItem('claude', 'message:result', {
+        subtype: 'success',
+        is_error: false
+      })
+    ).toBeNull()
+  })
+
+  it('renders codex systemError and Claude error result variants', () => {
+    const codex = unhandledProviderFrameJournalItem('codex', 'notification:thread/status/changed', {
+      threadId: 'thread-1',
+      status: { type: 'systemError' }
+    })
+    const claude = unhandledProviderFrameJournalItem('claude', 'message:result', {
+      subtype: 'error_during_execution',
+      is_error: true,
+      result: 'Provider request failed'
+    })
+
+    expect(codex?.body.providerFrame).toMatchObject({
+      provider: 'codex',
+      kind: 'notification:thread/status/changed'
+    })
+    expect(claude?.body.providerFrame).toMatchObject({
+      provider: 'claude',
+      kind: 'message:result'
+    })
+    expect(
+      claude
+        ? projectStructuredItemToNativeChat({
+            itemId: 'claude-error',
+            revision: 1,
+            sequence: 1,
+            observedAt: 1,
+            body: claude.body
+          })
+        : null
+    ).toMatchObject({
+      role: 'system',
+      blocks: [
+        expect.objectContaining({
+          providerFrame: expect.objectContaining({ kind: 'message:result' })
+        })
+      ]
+    })
+  })
+
+  it('keeps failed startup variants visible while suppressing startup progress', () => {
+    const kind = 'notification:mcpServer/startupStatus/updated'
+
+    expect(
+      unhandledProviderFrameJournalItem('codex', kind, {
+        name: 'filesystem',
+        status: 'starting',
+        error: null,
+        failureReason: null
+      })
+    ).toBeNull()
+    expect(
+      unhandledProviderFrameJournalItem('codex', kind, {
+        name: 'filesystem',
+        status: 'failed',
+        error: 'server exited',
+        failureReason: null
+      })
+    ).not.toBeNull()
   })
 
   it('keeps unknown substantive frames visible for both providers', () => {
diff --git a/src/main/native-chat/agent-session-wire/unhandled-provider-frame.ts b/src/main/native-chat/agent-session-wire/unhandled-provider-frame.ts
index f79a4f70ac3..0dc275bed50 100644
--- a/src/main/native-chat/agent-session-wire/unhandled-provider-frame.ts
+++ b/src/main/native-chat/agent-session-wire/unhandled-provider-frame.ts
@@ -27,7 +27,7 @@ export function unhandledProviderFrameJournalItem(
   payload: unknown,
   limits: JournalPayloadLimits = DEFAULT_JOURNAL_PAYLOAD_LIMITS
 ): UnhandledProviderFrameJournalItem | null {
-  if (classifyProviderFrame(provider, kind) === 'debug-only') {
+  if (classifyProviderFrame(provider, kind, payload) === 'debug-only') {
     return null
   }
   const serialized = serializeProviderPayload(payload)