diff --git a/src/main/claude/claude-structured-item-translation.ts b/src/main/claude/claude-structured-item-translation.ts
index 1c1673b59cd..3b43a0c9301 100644
--- a/src/main/claude/claude-structured-item-translation.ts
+++ b/src/main/claude/claude-structured-item-translation.ts
@@ -6,7 +6,7 @@ import type {
 import type { NativeChatBlock } from '../../shared/native-chat-types'
 import {
   boundInlineText,
-  DEFAULT_JOURNAL_PAYLOAD_LIMITS
+  type JournalPayloadLimits
 } from '../native-chat/agent-session-journal/journal-payload-bounds'
 
 export type ClaudeMessageEnvelope = {
@@ -171,18 +171,19 @@ export function claudeThinkingText(envelope: ClaudeMessageEnvelope): string | nu
   return parts.length > 0 ? parts.join('\n') : null
 }
 
-export function claudeToolBody(input: {
-  tool: ClaudeToolUse
-  result?: ClaudeToolResult
-}): AgentJournalItemBody {
+export function claudeToolBody(
+  input: {
+    tool: ClaudeToolUse
+    result?: ClaudeToolResult
+  },
+  limits: JournalPayloadLimits
+): AgentJournalItemBody {
   return {
     kind: 'tool-call',
     name: input.tool.name,
     input: input.tool.input,
     state: input.result ? (input.result.failed ? 'failed' : 'completed') : 'running',
-    ...(input.result
-      ? { output: boundInlineText(input.result.output, DEFAULT_JOURNAL_PAYLOAD_LIMITS).bounded }
-      : {})
+    ...(input.result ? { output: boundInlineText(input.result.output, limits).bounded } : {})
   }
 }
 
diff --git a/src/main/claude/claude-structured-journal-translation.test.ts b/src/main/claude/claude-structured-journal-translation.test.ts
index 951872f0c69..07d786c2842 100644
--- a/src/main/claude/claude-structured-journal-translation.test.ts
+++ b/src/main/claude/claude-structured-journal-translation.test.ts
@@ -17,7 +17,7 @@ import {
 } from '../native-chat/agent-session-wire/structured-agent-session-event-sink'
 import {
   boundInlineText,
-  DEFAULT_JOURNAL_PAYLOAD_LIMITS
+  UNRETAINED_JOURNAL_PAYLOAD_LIMITS
 } from '../native-chat/agent-session-journal/journal-payload-bounds'
 import type { ClaudePendingPrompt } from './claude-structured-prompt-replies'
 import { createClaudeJournalTranslator } from './claude-structured-journal-translation'
@@ -567,7 +567,7 @@ describe('Claude structured journal translation', () => {
 
     expect(state.items.at(-1)?.body).toEqual({
       kind: 'status',
-      text: boundInlineText(thinking, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text
+      text: boundInlineText(thinking, UNRETAINED_JOURNAL_PAYLOAD_LIMITS).text
     })
   })
 
diff --git a/src/main/claude/claude-structured-journal-translation.ts b/src/main/claude/claude-structured-journal-translation.ts
index 759c2926763..9d26f89f60d 100644
--- a/src/main/claude/claude-structured-journal-translation.ts
+++ b/src/main/claude/claude-structured-journal-translation.ts
@@ -1,11 +1,11 @@
 import type { AgentJournalItemIdentity } from '../../shared/agent-session-journal-types'
 import { agentJournalItemKey } from '../../shared/agent-session-journal-item-key'
 import type { AgentSessionDeltaCoalescerDeps } from '../native-chat/agent-session-wire/agent-session-delta-coalescer'
-import type { StructuredAgentSessionEventSink } from '../native-chat/agent-session-wire/structured-agent-session-event-sink'
 import {
-  boundInlineText,
-  DEFAULT_JOURNAL_PAYLOAD_LIMITS
-} from '../native-chat/agent-session-journal/journal-payload-bounds'
+  structuredAgentSessionPayloadLimits,
+  type StructuredAgentSessionEventSink
+} from '../native-chat/agent-session-wire/structured-agent-session-event-sink'
+import { boundInlineText } from '../native-chat/agent-session-journal/journal-payload-bounds'
 import type { ClaudeStructuredSessionEvent } from './claude-structured-session-state'
 import {
   claudeMessageBody,
@@ -166,7 +166,7 @@ export function createClaudeJournalTranslator(
       tools.set(tool.id, tool)
       deps.sink.appendItem(
         claudeToolIdentity(envelope.sessionId, tool.id),
-        claudeToolBody({ tool })
+        claudeToolBody({ tool }, structuredAgentSessionPayloadLimits(deps.sink))
       )
       changed = true
     }
@@ -178,7 +178,7 @@ export function createClaudeJournalTranslator(
       }
       deps.sink.appendItem(
         claudeToolIdentity(envelope.sessionId, result.toolUseId),
-        claudeToolBody({ tool, result })
+        claudeToolBody({ tool, result }, structuredAgentSessionPayloadLimits(deps.sink))
       )
       // A spawn call's result is the parent turn's evidence its child finished.
       subagents.observeToolResult(result.toolUseId, result.failed)
@@ -190,7 +190,7 @@ export function createClaudeJournalTranslator(
     if (thinking) {
       deps.sink.appendItem(claudeThinkingIdentity(envelope.sessionId, envelope.uuid), {
         kind: 'status',
-        text: boundInlineText(thinking, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text
+        text: boundInlineText(thinking, structuredAgentSessionPayloadLimits(deps.sink)).text
       })
       changed = true
     }
@@ -234,7 +234,10 @@ export function createClaudeJournalTranslator(
         promptKey: event.prompt.promptKey
       })
       identities.push(identity)
-      deps.sink.appendItem(identity, claudeApprovalItem(event.prompt))
+      deps.sink.appendItem(
+        identity,
+        claudeApprovalItem(event.prompt, structuredAgentSessionPayloadLimits(deps.sink))
+      )
       deps.bindPromptItemId?.(agentJournalItemKey(identity), event.prompt.promptKey)
     }
     promptItems.set(event.prompt.promptKey, identities)
diff --git a/src/main/claude/claude-structured-prompt-items.ts b/src/main/claude/claude-structured-prompt-items.ts
index 3bdf8ab6091..ed2ea85d712 100644
--- a/src/main/claude/claude-structured-prompt-items.ts
+++ b/src/main/claude/claude-structured-prompt-items.ts
@@ -7,7 +7,7 @@ import type {
 } from '../../shared/agent-session-journal-types'
 import {
   boundInlineText,
-  DEFAULT_JOURNAL_PAYLOAD_LIMITS
+  type JournalPayloadLimits
 } from '../native-chat/agent-session-journal/journal-payload-bounds'
 import { claudeRecord, claudeText } from './claude-structured-item-translation'
 import {
@@ -43,12 +43,15 @@ export function claudePromptIdentity(input: {
   }
 }
 
-export function claudeApprovalItem(prompt: ClaudePendingPrompt): AgentJournalApprovalItem {
+export function claudeApprovalItem(
+  prompt: ClaudePendingPrompt,
+  limits: JournalPayloadLimits
+): AgentJournalApprovalItem {
   const serialized = JSON.stringify(prompt.input)
   return {
     kind: 'approval',
     title: `Allow ${prompt.toolName}?`,
-    detail: serialized ? boundInlineText(serialized, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text : null,
+    detail: serialized ? boundInlineText(serialized, limits).text : null,
     options: CLAUDE_APPROVAL_DECISIONS.map((decision) => ({
       id: decision,
       label: APPROVAL_LABELS[decision]
diff --git a/src/main/claude/claude-structured-provider-fallback.ts b/src/main/claude/claude-structured-provider-fallback.ts
index 68aec07976b..d919242b766 100644
--- a/src/main/claude/claude-structured-provider-fallback.ts
+++ b/src/main/claude/claude-structured-provider-fallback.ts
@@ -1,8 +1,8 @@
-import type { StructuredAgentSessionEventSink } from '../native-chat/agent-session-wire/structured-agent-session-event-sink'
 import {
-  boundInlineText,
-  DEFAULT_JOURNAL_PAYLOAD_LIMITS
-} from '../native-chat/agent-session-journal/journal-payload-bounds'
+  structuredAgentSessionPayloadLimits,
+  type StructuredAgentSessionEventSink
+} from '../native-chat/agent-session-wire/structured-agent-session-event-sink'
+import { boundInlineText } from '../native-chat/agent-session-journal/journal-payload-bounds'
 import { CLAUDE_STREAM_JSON_FRAME_KINDS } from '../native-chat/agent-session-wire/claude-stream-json-frame-schema'
 import {
   readableProviderFrameText,
@@ -112,13 +112,12 @@ export function createClaudeProviderFrameFallback(
   return {
     append: (kind, payload, displayText) => {
       sequence += 1
-      const translated = unhandledProviderFrameJournalItem('claude', kind, payload)
+      const limits = structuredAgentSessionPayloadLimits(sink)
+      const translated = unhandledProviderFrameJournalItem('claude', kind, payload, limits)
       if (!translated) {
         return
       }
-      const bounded = displayText
-        ? boundInlineText(displayText, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text
-        : null
+      const bounded = displayText ? boundInlineText(displayText, limits).text : null
       sink.appendItem(
         {
           provider: 'orca',
diff --git a/src/main/codex/codex-image-item-translation.ts b/src/main/codex/codex-image-item-translation.ts
index 7d5e70a0c51..2bf5effcf16 100644
--- a/src/main/codex/codex-image-item-translation.ts
+++ b/src/main/codex/codex-image-item-translation.ts
@@ -1,12 +1,12 @@
 import type { AgentJournalMessageItem } from '../../shared/agent-session-journal-types'
 import type { NativeChatBlock } from '../../shared/native-chat-types'
 import { buildImageDataUri } from '../../shared/image-data-uri'
-import { DEFAULT_JOURNAL_PAYLOAD_LIMITS } from '../native-chat/agent-session-journal/journal-payload-bounds'
+import { DEFAULT_JOURNAL_INLINE_HEAD_BYTES } from '../native-chat/agent-session-journal/journal-payload-bounds'
 import { readString } from './codex-item-field-readers'
 import type { CodexThreadItem } from './codex-thread-item-identity'
 
 // Leave room for operation text and the journal envelope beside inline image bytes.
-const MAX_IMAGE_REFERENCE_BYTES = DEFAULT_JOURNAL_PAYLOAD_LIMITS.inlineHeadBytes / 2
+const MAX_IMAGE_REFERENCE_BYTES = DEFAULT_JOURNAL_INLINE_HEAD_BYTES / 2
 
 function imagePath(item: CodexThreadItem, key: string): string | null {
   const value = readString(item, key)
diff --git a/src/main/codex/codex-notice-item-translation.test.ts b/src/main/codex/codex-notice-item-translation.test.ts
index 15f638c4015..be7313d588f 100644
--- a/src/main/codex/codex-notice-item-translation.test.ts
+++ b/src/main/codex/codex-notice-item-translation.test.ts
@@ -2,30 +2,44 @@ import { describe, expect, it } from 'vitest'
 import { codexItemBody, codexStreamingJournalItem } from './codex-structured-item-translation'
 import { AgentJournalItemBodySchema } from '../../shared/agent-session-journal-schemas'
 import { projectStructuredItemsToNativeChat } from '../../shared/structured-agent-session-projection'
+import { UNRETAINED_JOURNAL_PAYLOAD_LIMITS } from '../native-chat/agent-session-journal/journal-payload-bounds'
 
 describe('plan document translation', () => {
   it('marks both complete documents and streaming snapshots', () => {
     const item = { id: 'plan-1', type: 'plan', text: '# Plan\n\nReadable prose.' }
-    expect(codexItemBody(item)).toEqual({
+    expect(codexItemBody(item, UNRETAINED_JOURNAL_PAYLOAD_LIMITS)).toEqual({
       kind: 'status',
       text: item.text,
       presentation: 'plan-document'
     })
-    expect(codexStreamingJournalItem(item, '# Plan\n\nPartial').body).toEqual({
+    expect(
+      codexStreamingJournalItem(item, '# Plan\n\nPartial', UNRETAINED_JOURNAL_PAYLOAD_LIMITS).body
+    ).toEqual({
       kind: 'status',
       text: '# Plan\n\nPartial',
       presentation: 'plan-document'
     })
-    expect(codexItemBody({ id: 'plan-1', type: 'plan' })).toBeNull()
+    expect(
+      codexItemBody({ id: 'plan-1', type: 'plan' }, UNRETAINED_JOURNAL_PAYLOAD_LIMITS)
+    ).toBeNull()
   })
   it('preserves the full existing reasoning body byte for byte', () => {
     expect(
-      codexItemBody({ id: 'r', type: 'reasoning', summary: ['Thinking through the problem.'] })
+      codexItemBody(
+        { id: 'r', type: 'reasoning', summary: ['Thinking through the problem.'] },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toEqual({
       kind: 'status',
       text: 'Thinking through the problem.'
     })
-    expect(codexStreamingJournalItem({ id: 'r', type: 'reasoning' }, 'Thinking…')).toEqual({
+    expect(
+      codexStreamingJournalItem(
+        { id: 'r', type: 'reasoning' },
+        'Thinking…',
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
+    ).toEqual({
       body: { kind: 'status', text: 'Thinking…' },
       handled: true
     })
@@ -36,7 +50,9 @@ describe('image item translation', () => {
   it.each(['/remote/work/image.png', 'C:\\work\\image.png'])(
     'preserves the execution-host path %s and old-reader operation text',
     (path) => {
-      expect(codexItemBody({ id: 'view', type: 'imageView', path })).toEqual({
+      expect(
+        codexItemBody({ id: 'view', type: 'imageView', path }, UNRETAINED_JOURNAL_PAYLOAD_LIMITS)
+      ).toEqual({
         kind: 'message',
         role: 'assistant',
         blocks: [
@@ -47,13 +63,16 @@ describe('image item translation', () => {
     }
   )
   it('prefers saved paths over unbounded inline image data', () => {
-    const body = codexItemBody({
-      id: 'gen',
-      type: 'imageGeneration',
-      status: 'completed',
-      savedPath: '/remote/image.png',
-      result: 'A'.repeat(100_000)
-    })
+    const body = codexItemBody(
+      {
+        id: 'gen',
+        type: 'imageGeneration',
+        status: 'completed',
+        savedPath: '/remote/image.png',
+        result: 'A'.repeat(100_000)
+      },
+      UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+    )
     expect(body).toEqual({
       kind: 'message',
       role: 'assistant',
@@ -72,7 +91,10 @@ describe('image item translation', () => {
     'maps bounded image data onto a meaningful existing image-ref: %s',
     (result) => {
       expect(
-        codexItemBody({ id: 'gen', type: 'imageGeneration', status: 'completed', result })
+        codexItemBody(
+          { id: 'gen', type: 'imageGeneration', status: 'completed', result },
+          UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+        )
       ).toMatchObject({
         kind: 'message',
         role: 'assistant',
@@ -86,12 +108,15 @@ describe('image item translation', () => {
   it.each(['A'.repeat(20_000), 'not valid image bytes', 'data:text/html;base64,AAAA', ''])(
     'keeps unavailable results bounded and readable',
     (result) => {
-      const body = codexItemBody({
-        id: 'gen',
-        type: 'imageGeneration',
-        status: 'completed',
-        result
-      })
+      const body = codexItemBody(
+        {
+          id: 'gen',
+          type: 'imageGeneration',
+          status: 'completed',
+          result
+        },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
       expect(body).toEqual({
         kind: 'message',
         role: 'assistant',
@@ -105,7 +130,12 @@ describe('image item translation', () => {
     [{ status: 'completed', failure: { type: 'usageLimitExceeded' } }, 'Image generation failed'],
     [{ status: 'future-state' }, 'Image generation: preview unavailable']
   ])('does not invent completed output for %j', (fields, text) => {
-    expect(codexItemBody({ id: 'gen', type: 'imageGeneration', ...fields })).toEqual({
+    expect(
+      codexItemBody(
+        { id: 'gen', type: 'imageGeneration', ...fields },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
+    ).toEqual({
       kind: 'message',
       role: 'assistant',
       blocks: [{ type: 'text', text }]
diff --git a/src/main/codex/codex-prompt-registry-bounds.ts b/src/main/codex/codex-prompt-registry-bounds.ts
index e5f79fe3a31..54a7ce640a3 100644
--- a/src/main/codex/codex-prompt-registry-bounds.ts
+++ b/src/main/codex/codex-prompt-registry-bounds.ts
@@ -1,3 +1,4 @@
+import { JOURNAL_OVERFLOW_NOT_RETAINED } from '../native-chat/agent-session-journal/journal-overflow-store'
 import {
   boundPayload,
   digestPayload
@@ -19,8 +20,11 @@ export function codexJournalPromptIdPart(value: string): string {
     return value
   }
   const suffix = `#${digestPayload(value).slice(0, 32)}`
+  // A prompt id, not user content: the clipped tail is replaced by the digest
+  // suffix that keeps it unique, so there is nothing to retain.
   const bounded = boundPayload(value, {
-    inlineHeadBytes: CODEX_JOURNAL_PROMPT_ID_COMPONENT_MAX_BYTES - suffix.length
+    inlineHeadBytes: CODEX_JOURNAL_PROMPT_ID_COMPONENT_MAX_BYTES - suffix.length,
+    overflow: JOURNAL_OVERFLOW_NOT_RETAINED
   })
   return `${bounded.head}${suffix}`
 }
diff --git a/src/main/codex/codex-structured-item-streams.ts b/src/main/codex/codex-structured-item-streams.ts
index e67263f133d..1e3e243e2b6 100644
--- a/src/main/codex/codex-structured-item-streams.ts
+++ b/src/main/codex/codex-structured-item-streams.ts
@@ -1,4 +1,5 @@
 import { agentJournalItemKey } from '../../shared/agent-session-journal-item-key'
+import { structuredAgentSessionPayloadLimits } from '../native-chat/agent-session-wire/structured-agent-session-event-sink'
 import { createAgentSessionDeltaCoalescer } from '../native-chat/agent-session-wire/agent-session-delta-coalescer'
 import { CodexItemStreamRetention } from './codex-item-stream-retention'
 import {
@@ -99,7 +100,8 @@ export function createCodexStructuredItemStreams(
   }
 
   const append = (state: CodexItemStreamState, text: string): boolean => {
-    const translated = codexStreamingJournalItem(state.item, text)
+    const limits = structuredAgentSessionPayloadLimits(deps.sink)
+    const translated = codexStreamingJournalItem(state.item, text, limits)
     if (!translated.body) {
       return true
     }
@@ -237,7 +239,8 @@ export function createCodexStructuredItemStreams(
           return { handled: true, admission: { accepted: false, reason: 'failed' } }
         }
         state.item = { ...state.item, changes: paramsRecord.changes }
-        const translated = codexJournalItem(state.item)
+        const limits = structuredAgentSessionPayloadLimits(deps.sink)
+        const translated = codexJournalItem(state.item, limits)
         if (translated.body) {
           const nextPending: CodexPendingItemPatch = {
             identity: state.identity,
diff --git a/src/main/codex/codex-structured-item-translation.test.ts b/src/main/codex/codex-structured-item-translation.test.ts
index 201df58bc90..9c398db4f6e 100644
--- a/src/main/codex/codex-structured-item-translation.test.ts
+++ b/src/main/codex/codex-structured-item-translation.test.ts
@@ -6,10 +6,10 @@ import {
   describeToolInput
 } from '../../shared/native-chat-tool-summary'
 import {
-  codexItemBody,
+  codexItemBody as boundCodexItemBody,
   codexItemIdentity,
-  codexJournalItem,
-  codexMessageBlocks,
+  codexJournalItem as boundCodexJournalItem,
+  codexMessageBlocks as boundCodexMessageBlocks,
   CodexTurnOrdinals,
   MAX_CODEX_TURN_ORDINAL_BYTES,
   MAX_CODEX_TURN_ORDINAL_ENTRIES,
@@ -17,6 +17,16 @@ import {
   readCodexThreadItem,
   type CodexThreadItem
 } from './codex-structured-item-translation'
+import { UNRETAINED_JOURNAL_PAYLOAD_LIMITS } from '../native-chat/agent-session-journal/journal-payload-bounds'
+
+// These cases assert the clip and the shape of a translated row. Retention of
+// what the clip drops has its own suite, so they all bound the same way.
+const codexItemBody = (item: CodexThreadItem) =>
+  boundCodexItemBody(item, UNRETAINED_JOURNAL_PAYLOAD_LIMITS)
+const codexJournalItem = (item: CodexThreadItem) =>
+  boundCodexJournalItem(item, UNRETAINED_JOURNAL_PAYLOAD_LIMITS)
+const codexMessageBlocks = (item: CodexThreadItem) =>
+  boundCodexMessageBlocks(item, UNRETAINED_JOURNAL_PAYLOAD_LIMITS)
 
 /** The tool-call input a Codex item lands on, which is what the row label and
  *  the collapsed run header are both derived from. */
diff --git a/src/main/codex/codex-structured-item-translation.ts b/src/main/codex/codex-structured-item-translation.ts
index 576f3fb19ec..051b214440c 100644
--- a/src/main/codex/codex-structured-item-translation.ts
+++ b/src/main/codex/codex-structured-item-translation.ts
@@ -4,7 +4,7 @@ import type { NativeChatBlock } from '../../shared/native-chat-types'
 import {
   boundInlineText,
   boundToolInput,
-  DEFAULT_JOURNAL_PAYLOAD_LIMITS
+  type JournalPayloadLimits
 } from '../native-chat/agent-session-journal/journal-payload-bounds'
 import { unhandledProviderFrameJournalItem } from '../native-chat/agent-session-wire/unhandled-provider-frame'
 import { codexImageItemBody } from './codex-image-item-translation'
@@ -31,13 +31,16 @@ export {
 // Codex thread items → journal item bodies.
 
 /** `userMessage` carries structured content parts; `agentMessage` a flat text. */
-export function codexMessageBlocks(item: CodexThreadItem): NativeChatBlock[] {
+export function codexMessageBlocks(
+  item: CodexThreadItem,
+  limits: JournalPayloadLimits
+): NativeChatBlock[] {
   const text =
     item.type === 'agentMessage'
       ? (readString(item, 'text') ?? readTextContent(item, 'content'))
       : readString(item, 'text')
   if (text !== null) {
-    return [{ type: 'text', text: boundInlineText(text, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text }]
+    return [{ type: 'text', text: boundInlineText(text, limits).text }]
   }
   const content = item.content
   if (!Array.isArray(content)) {
@@ -52,7 +55,7 @@ export function codexMessageBlocks(item: CodexThreadItem): NativeChatBlock[] {
     if (partText !== null) {
       blocks.push({
         type: 'text',
-        text: boundInlineText(partText, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text
+        text: boundInlineText(partText, limits).text
       })
       continue
     }
@@ -85,9 +88,9 @@ export type CodexJournalItem = {
   handled: boolean
 }
 
-function commandItem(item: CodexThreadItem): CodexJournalItem {
+function commandItem(item: CodexThreadItem, limits: JournalPayloadLimits): CodexJournalItem {
   const output = readFirstString(item, ['aggregatedOutput', 'aggregated_output'])
-  const bounded = output === null ? null : boundInlineText(output, DEFAULT_JOURNAL_PAYLOAD_LIMITS)
+  const bounded = output === null ? null : boundInlineText(output, limits)
   const parsed = commandActionFacts(item)
   return {
     body: {
@@ -96,7 +99,7 @@ function commandItem(item: CodexThreadItem): CodexJournalItem {
       // Raw command and cwd stay so the expanded view still shows what ran.
       input: boundToolInput(
         { command: item.command ?? null, cwd: item.cwd ?? null, ...parsed?.fields },
-        DEFAULT_JOURNAL_PAYLOAD_LIMITS
+        limits
       ),
       state: commandState(item),
       ...toolExecutionMetadata(item),
@@ -106,7 +109,7 @@ function commandItem(item: CodexThreadItem): CodexJournalItem {
   }
 }
 
-function fileChangeItem(item: CodexThreadItem): CodexJournalItem {
+function fileChangeItem(item: CodexThreadItem, limits: JournalPayloadLimits): CodexJournalItem {
   const changes = Array.isArray(item.changes)
     ? item.changes.flatMap((change) => {
         const record = typeof change === 'object' && change !== null ? readRecord(change) : {}
@@ -120,14 +123,14 @@ function fileChangeItem(item: CodexThreadItem): CodexJournalItem {
       body: {
         kind: 'tool-call',
         name: 'apply_patch',
-        input: boundToolInput({ changes: item.changes ?? null }, DEFAULT_JOURNAL_PAYLOAD_LIMITS),
+        input: boundToolInput({ changes: item.changes ?? null }, limits),
         state: commandState(item)
       },
       handled: true
     }
   }
   const patch = changes.map((change) => change.diff).join('\n')
-  const bounded = boundInlineText(patch, DEFAULT_JOURNAL_PAYLOAD_LIMITS).bounded
+  const bounded = boundInlineText(patch, limits).bounded
   return {
     body: {
       kind: 'diff',
@@ -161,18 +164,18 @@ function mcpToolArguments(value: unknown): unknown {
   return Array.isArray(value) ? { arguments: value } : Object.keys(value).length > 0 ? value : null
 }
 
-function mcpToolCallItem(item: CodexThreadItem): CodexJournalItem {
+function mcpToolCallItem(item: CodexThreadItem, limits: JournalPayloadLimits): CodexJournalItem {
   const server = readString(item, 'server')
   const tool = readString(item, 'tool')
   const failure = readString(readRecord(item.error), 'message')
   const text = failure ?? readTextContent(readRecord(item.result), 'content')
-  const bounded = text === null ? null : boundInlineText(text, DEFAULT_JOURNAL_PAYLOAD_LIMITS)
+  const bounded = text === null ? null : boundInlineText(text, limits)
   return {
     body: {
       kind: 'tool-call',
       name: mcpToolCallName(item),
       ...(server && tool ? { mcpIdentity: { server, tool } } : {}),
-      input: boundToolInput(mcpToolArguments(item.arguments), DEFAULT_JOURNAL_PAYLOAD_LIMITS),
+      input: boundToolInput(mcpToolArguments(item.arguments), limits),
       state: failure === null ? commandState(item) : 'failed',
       ...(bounded === null ? {} : { output: bounded.bounded })
     },
@@ -205,16 +208,16 @@ function webSearchInput(item: CodexThreadItem): Record<string, unknown> | null {
  *  action, then sends the action, so `action` is the completion signal — a
  *  completed item's own `query` is routinely still empty. The hits arrive on
  *  `results` and are the call's output. */
-function webSearchItem(item: CodexThreadItem): CodexJournalItem {
+function webSearchItem(item: CodexThreadItem, limits: JournalPayloadLimits): CodexJournalItem {
   const results = toolWebSearchResults(item.results)
   const hits = Array.isArray(item.results) && item.results.length > 0 ? item.results : null
-  const bounded = hits && boundInlineText(JSON.stringify(hits), DEFAULT_JOURNAL_PAYLOAD_LIMITS)
+  const bounded = hits && boundInlineText(JSON.stringify(hits), limits)
   return {
     body: {
       kind: 'tool-call',
       name: 'web_search',
       ...(results.length > 0 ? { webSearchResults: results } : {}),
-      input: boundToolInput(webSearchInput(item), DEFAULT_JOURNAL_PAYLOAD_LIMITS),
+      input: boundToolInput(webSearchInput(item), limits),
       state: item.action === null || item.action === undefined ? 'running' : 'completed',
       ...(bounded === null ? {} : { output: bounded.bounded })
     },
@@ -228,9 +231,12 @@ function webSearchItem(item: CodexThreadItem): CodexJournalItem {
  * Known empty items wait for later deltas. Unknown types become bounded status
  * rows so a provider release cannot make new activity invisible.
  */
-export function codexJournalItem(item: CodexThreadItem): CodexJournalItem {
+export function codexJournalItem(
+  item: CodexThreadItem,
+  limits: JournalPayloadLimits
+): CodexJournalItem {
   if (item.type === 'userMessage' || item.type === 'agentMessage') {
-    const blocks = codexMessageBlocks(item)
+    const blocks = codexMessageBlocks(item, limits)
     return {
       body:
         blocks.length === 0
@@ -240,16 +246,16 @@ export function codexJournalItem(item: CodexThreadItem): CodexJournalItem {
     }
   }
   if (item.type === 'commandExecution') {
-    return commandItem(item)
+    return commandItem(item, limits)
   }
   if (item.type === 'fileChange') {
-    return fileChangeItem(item)
+    return fileChangeItem(item, limits)
   }
   if (item.type === 'mcpToolCall') {
-    return mcpToolCallItem(item)
+    return mcpToolCallItem(item, limits)
   }
   if (item.type === 'webSearch') {
-    return webSearchItem(item)
+    return webSearchItem(item, limits)
   }
   if (item.type === 'imageView' || item.type === 'imageGeneration') {
     return { body: codexImageItemBody(item), handled: true }
@@ -262,7 +268,7 @@ export function codexJournalItem(item: CodexThreadItem): CodexJournalItem {
           ? null
           : {
               kind: 'status',
-              text: boundInlineText(text, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text,
+              text: boundInlineText(text, limits).text,
               presentation: 'plan-document'
             },
       handled: true
@@ -274,43 +280,50 @@ export function codexJournalItem(item: CodexThreadItem): CodexJournalItem {
       readTextContent(item, 'summary') ??
       readTextContent(item, 'content')
     return {
-      body:
-        text === null
-          ? null
-          : { kind: 'status', text: boundInlineText(text, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text },
+      body: text === null ? null : { kind: 'status', text: boundInlineText(text, limits).text },
       handled: true
     }
   }
-  const unhandled = unhandledProviderFrameJournalItem('codex', `item:${item.type}`, item)
+  const unhandled = unhandledProviderFrameJournalItem('codex', `item:${item.type}`, item, limits)
   return unhandled ? { body: unhandled.body, handled: false } : { body: null, handled: true }
 }
 
-export function codexItemBody(item: CodexThreadItem): AgentJournalItemBody | null {
-  return codexJournalItem(item).body
+export function codexItemBody(
+  item: CodexThreadItem,
+  limits: JournalPayloadLimits
+): AgentJournalItemBody | null {
+  return codexJournalItem(item, limits).body
 }
 
 /** Snapshot body for text still streaming, before its item completes. */
-export function codexStreamingMessageBody(text: string): AgentJournalItemBody {
+export function codexStreamingMessageBody(
+  text: string,
+  limits: JournalPayloadLimits
+): AgentJournalItemBody {
   return {
     kind: 'message',
     role: 'assistant',
-    blocks: [{ type: 'text', text: boundInlineText(text, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text }]
+    blocks: [{ type: 'text', text: boundInlineText(text, limits).text }]
   }
 }
 
 /** Snapshot body for any item-level stream, keyed onto its parent item. */
-export function codexStreamingJournalItem(item: CodexThreadItem, text: string): CodexJournalItem {
+export function codexStreamingJournalItem(
+  item: CodexThreadItem,
+  text: string,
+  limits: JournalPayloadLimits
+): CodexJournalItem {
   if (item.type === 'agentMessage') {
-    return { body: codexStreamingMessageBody(text), handled: true }
+    return { body: codexStreamingMessageBody(text, limits), handled: true }
   }
   if (item.type === 'commandExecution') {
-    return commandItem({ ...item, aggregatedOutput: text })
+    return commandItem({ ...item, aggregatedOutput: text }, limits)
   }
   if (item.type === 'fileChange') {
     const path = Array.isArray(item.changes)
       ? readString(readRecord(item.changes[0]), 'path')
       : null
-    const bounded = boundInlineText(text, DEFAULT_JOURNAL_PAYLOAD_LIMITS).bounded
+    const bounded = boundInlineText(text, limits).bounded
     return {
       body: { kind: 'diff', path: path ?? 'pending patch', patch: bounded },
       handled: true
@@ -320,12 +333,12 @@ export function codexStreamingJournalItem(item: CodexThreadItem, text: string):
     return {
       body: {
         kind: 'status',
-        text: boundInlineText(text, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text,
+        text: boundInlineText(text, limits).text,
         presentation: 'plan-document'
       },
       handled: true
     }
   }
-  const bounded = boundInlineText(text, DEFAULT_JOURNAL_PAYLOAD_LIMITS)
+  const bounded = boundInlineText(text, limits)
   return { body: { kind: 'status', text: bounded.text }, handled: true }
 }
diff --git a/src/main/codex/codex-structured-journal-generic-frames.ts b/src/main/codex/codex-structured-journal-generic-frames.ts
index 6c211a8f5a4..121cd2ba78a 100644
--- a/src/main/codex/codex-structured-journal-generic-frames.ts
+++ b/src/main/codex/codex-structured-journal-generic-frames.ts
@@ -12,6 +12,7 @@ import {
   MAX_CODEX_GENERIC_TURN_BUCKETS
 } from './codex-structured-journal-limits'
 import { readCodexTurnId } from './codex-structured-thread-facts'
+import { structuredAgentSessionPayloadLimits } from '../native-chat/agent-session-wire/structured-agent-session-event-sink'
 
 const OVERFLOW_BUCKET = '__codex-generic-overflow__'
 type SuppressedSummary = { count: number; publishedCount: number }
@@ -63,7 +64,12 @@ export class CodexJournalGenericFrames {
     payload: unknown,
     threadId = 'session'
   ): CodexJournalTranslationAdmission {
-    const translated = unhandledProviderFrameJournalItem('codex', kind, payload)
+    const translated = unhandledProviderFrameJournalItem(
+      'codex',
+      kind,
+      payload,
+      structuredAgentSessionPayloadLimits(this.deps.sink)
+    )
     // A frame the classifier declines is deliberately not journaled, which is success.
     // Failing admission here force-closes the provider through the retry queue.
     if (!translated) {
diff --git a/src/main/codex/codex-structured-journal-items.ts b/src/main/codex/codex-structured-journal-items.ts
index 62091580da3..fa6a78f6c8b 100644
--- a/src/main/codex/codex-structured-journal-items.ts
+++ b/src/main/codex/codex-structured-journal-items.ts
@@ -3,6 +3,7 @@ import type {
   AgentJournalItemIdentity
 } from '../../shared/agent-session-journal-types'
 import { requiresTerminalSettlement } from '../native-chat/agent-session-journal/journal-terminal-settlement'
+import { structuredAgentSessionPayloadLimits } from '../native-chat/agent-session-wire/structured-agent-session-event-sink'
 import {
   codexItemIdentity,
   codexJournalItem,
@@ -89,7 +90,7 @@ export class CodexJournalItems {
     ) {
       return { handled: true, admission: { accepted: false, reason: 'failed' } }
     }
-    const translated = codexJournalItem(item)
+    const translated = codexJournalItem(item, structuredAgentSessionPayloadLimits(this.deps.sink))
     const command = readCodexJournalString(item, 'command')
     if (command) {
       const boundedCommand = Buffer.from(command, 'utf8')
@@ -214,7 +215,10 @@ export class CodexJournalItems {
       }
       const evicted = this.activeItems.get(oldest)
       if (evicted) {
-        const translated = codexJournalItem(evicted.item).body
+        const translated = codexJournalItem(
+          evicted.item,
+          structuredAgentSessionPayloadLimits(this.deps.sink)
+        ).body
         if (translated) {
           const admission = appendCodexLifecycleItem(
             this.deps.sink,
diff --git a/src/main/codex/codex-structured-journal-prompts.ts b/src/main/codex/codex-structured-journal-prompts.ts
index 93ecec77f77..e7a61ce6483 100644
--- a/src/main/codex/codex-structured-journal-prompts.ts
+++ b/src/main/codex/codex-structured-journal-prompts.ts
@@ -1,5 +1,6 @@
 import { agentJournalItemKey } from '../../shared/agent-session-journal-item-key'
 import { cancelledJournalPromptBody } from '../native-chat/agent-session-journal/journal-prompt-body-bounds'
+import { structuredAgentSessionPayloadLimits } from '../native-chat/agent-session-wire/structured-agent-session-event-sink'
 import {
   codexApprovalItem,
   codexPromptIdentity,
@@ -38,7 +39,8 @@ export class CodexJournalPrompts {
       const questions = codexQuestionItems({
         threadId: event.threadId,
         promptKey: event.promptKey,
-        params: event.params
+        params: event.params,
+        limits: structuredAgentSessionPayloadLimits(this.deps.sink)
       })
       const promptItems = questions.map(({ identity, body }) => ({ identity, body }))
       const admission = this.admit(event, promptItems)
@@ -63,7 +65,8 @@ export class CodexJournalPrompts {
     const body = codexApprovalItem({
       method: event.method,
       params: event.params,
-      detail: this.detailFor(event.threadId, event.codexItemId)
+      detail: this.detailFor(event.threadId, event.codexItemId),
+      limits: structuredAgentSessionPayloadLimits(this.deps.sink)
     })
     const admission = this.admit(event, [{ identity, body }])
     if (!admission.accepted) {
diff --git a/src/main/codex/codex-structured-journal-settlement.ts b/src/main/codex/codex-structured-journal-settlement.ts
index 8c8bf091839..e32de7029bd 100644
--- a/src/main/codex/codex-structured-journal-settlement.ts
+++ b/src/main/codex/codex-structured-journal-settlement.ts
@@ -21,6 +21,7 @@ import {
 import type { CodexStructuredItemStreams } from './codex-structured-item-streams'
 import type { CodexStructuredSessionEvent } from './codex-structured-session-adapter'
 import { codexCommandOutlivesTurn } from './codex-command-lifecycle'
+import { structuredAgentSessionPayloadLimits } from '../native-chat/agent-session-wire/structured-agent-session-event-sink'
 
 export type CodexActiveJournalItem = {
   threadId: string
@@ -50,9 +51,10 @@ export function settleCodexJournalSession(input: {
   const turnOrdinalsToForget: { threadId: string; turnId: string }[] = []
   for (const active of input.activeItems.values()) {
     const streamed = input.streams.snapshot(active.threadId, active.item.id)
+    const limits = structuredAgentSessionPayloadLimits(input.sink)
     const translated = streamed
-      ? codexStreamingJournalItem(active.item, streamed.text)
-      : codexJournalItem(active.item)
+      ? codexStreamingJournalItem(active.item, streamed.text, limits)
+      : codexJournalItem(active.item, limits)
     const body = interruptedBody(translated.body)
     if (body) {
       mutations.push({ kind: 'item', identity: active.identity, body })
@@ -123,9 +125,10 @@ export function settleCodexJournalTurn(input: {
       continue
     }
     const streamed = input.streams.snapshot(active.threadId, active.item.id)
+    const limits = structuredAgentSessionPayloadLimits(input.sink)
     const translated = streamed
-      ? codexStreamingJournalItem(active.item, streamed.text)
-      : codexJournalItem(active.item)
+      ? codexStreamingJournalItem(active.item, streamed.text, limits)
+      : codexJournalItem(active.item, limits)
     const body = interruptedBody(translated.body)
     if (body) {
       mutations.push({ kind: 'item', identity: active.identity, body })
@@ -176,9 +179,10 @@ export function settleCodexOversizedNotification(input: {
       continue
     }
     const streamed = input.streams.snapshot(active.threadId, active.item.id)
+    const limits = structuredAgentSessionPayloadLimits(input.sink)
     const translated = streamed
-      ? codexStreamingJournalItem(active.item, streamed.text)
-      : codexJournalItem(active.item)
+      ? codexStreamingJournalItem(active.item, streamed.text, limits)
+      : codexJournalItem(active.item, limits)
     const body = interruptedBody(translated.body)
     if (body) {
       mutations.push({ kind: 'item', identity: active.identity, body })
diff --git a/src/main/codex/codex-structured-prompt-items.test.ts b/src/main/codex/codex-structured-prompt-items.test.ts
index e5d996f05d5..7ab544ca611 100644
--- a/src/main/codex/codex-structured-prompt-items.test.ts
+++ b/src/main/codex/codex-structured-prompt-items.test.ts
@@ -11,6 +11,7 @@ import {
   encodeCodexQuestionOptionId
 } from './codex-structured-prompt-replies'
 import { MAX_JOURNAL_LIFECYCLE_BATCH_BYTES } from '../native-chat/agent-session-journal/journal-row-schema'
+import { UNRETAINED_JOURNAL_PAYLOAD_LIMITS } from '../native-chat/agent-session-journal/journal-payload-bounds'
 
 const THREAD_ID = 'thread-abc'
 const CODEX_ITEM_ID = 'item-4'
@@ -42,7 +43,8 @@ describe('codex approval items', () => {
     const command = codexApprovalItem({
       method: CODEX_COMMAND_APPROVAL_METHOD,
       params: { availableDecisions: ['accept'] },
-      detail: 'rm -rf build'
+      detail: 'rm -rf build',
+      limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
     })
 
     expect(command).toMatchObject({
@@ -52,10 +54,20 @@ describe('codex approval items', () => {
       resolution: { state: 'pending', selectedOptionId: null, resolvedBy: null, resolvedAt: null }
     })
     expect(
-      codexApprovalItem({ method: CODEX_FILE_CHANGE_APPROVAL_METHOD, params: {}, detail: null })
+      codexApprovalItem({
+        method: CODEX_FILE_CHANGE_APPROVAL_METHOD,
+        params: {},
+        detail: null,
+        limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      })
     ).toMatchObject({ title: 'Apply file changes?', detail: null })
     expect(
-      codexApprovalItem({ method: 'item/other/requestApproval', params: {}, detail: null })
+      codexApprovalItem({
+        method: 'item/other/requestApproval',
+        params: {},
+        detail: null,
+        limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      })
     ).toMatchObject({ title: 'Approve this action?' })
   })
 
@@ -63,7 +75,8 @@ describe('codex approval items', () => {
     const item = codexApprovalItem({
       method: CODEX_COMMAND_APPROVAL_METHOD,
       params: { reason: 'writes outside the workspace' },
-      detail: 'rm -rf build'
+      detail: 'rm -rf build',
+      limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
     })
 
     expect(item.detail).toBe('writes outside the workspace')
@@ -74,21 +87,24 @@ describe('codex approval items', () => {
       codexApprovalItem({
         method: CODEX_COMMAND_APPROVAL_METHOD,
         params: { command: ['git', 'status'] },
-        detail: 'parent command'
+        detail: 'parent command',
+        limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
       }).detail
     ).toBe('git status')
     expect(
       codexApprovalItem({
         method: CODEX_COMMAND_APPROVAL_METHOD,
         params: { command: ['pnpm', 'test'], reason: 'same parent reason' },
-        detail: 'parent command'
+        detail: 'parent command',
+        limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
       }).detail
     ).toBe('pnpm test')
     expect(
       codexApprovalItem({
         method: CODEX_FILE_CHANGE_APPROVAL_METHOD,
         params: { grantRoot: '/outside' },
-        detail: null
+        detail: null,
+        limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
       }).detail
     ).toBe('"/outside"')
   })
@@ -97,7 +113,8 @@ describe('codex approval items', () => {
     const item = codexApprovalItem({
       method: CODEX_COMMAND_APPROVAL_METHOD,
       params: { command: 'x'.repeat(2_000_000) },
-      detail: null
+      detail: null,
+      limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
     })
 
     expect(item.detail).toContain('output truncated')
@@ -118,7 +135,12 @@ describe('codex question items', () => {
   }
 
   it('makes one journal item per question, each with its own resolution', () => {
-    const items = codexQuestionItems({ threadId: THREAD_ID, promptKey: CODEX_ITEM_ID, params })
+    const items = codexQuestionItems({
+      threadId: THREAD_ID,
+      promptKey: CODEX_ITEM_ID,
+      params,
+      limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+    })
 
     expect(items.map((item) => item.questionId)).toEqual(['q1', 'q2'])
     expect(items.map((item) => item.body.question)).toEqual(['Which branch?', 'Proceed?'])
@@ -126,7 +148,12 @@ describe('codex question items', () => {
   })
 
   it('keys each question separately so two answers cannot collide on one row', () => {
-    const items = codexQuestionItems({ threadId: THREAD_ID, promptKey: CODEX_ITEM_ID, params })
+    const items = codexQuestionItems({
+      threadId: THREAD_ID,
+      promptKey: CODEX_ITEM_ID,
+      params,
+      limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+    })
 
     expect(items.map((item) => item.identity)).toEqual([
       { provider: 'orca', clientMessageId: 'codex-prompt:thread-abc:item-4:q1' },
@@ -135,7 +162,12 @@ describe('codex question items', () => {
   })
 
   it('names the question inside every option id, because codex replies by question', () => {
-    const items = codexQuestionItems({ threadId: THREAD_ID, promptKey: CODEX_ITEM_ID, params })
+    const items = codexQuestionItems({
+      threadId: THREAD_ID,
+      promptKey: CODEX_ITEM_ID,
+      params,
+      limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+    })
 
     expect(items[0]?.body.options).toEqual([
       { id: encodeCodexQuestionOptionId('q1', 'main'), label: 'main' },
@@ -148,7 +180,8 @@ describe('codex question items', () => {
     const items = codexQuestionItems({
       threadId: THREAD_ID,
       promptKey: CODEX_ITEM_ID,
-      params: { questions: [{ question: 'no id' }, { id: 'q3' }, { id: 'q4', question: 'ok' }] }
+      params: { questions: [{ question: 'no id' }, { id: 'q3' }, { id: 'q4', question: 'ok' }] },
+      limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
     })
 
     expect(items.map((item) => item.questionId)).toEqual(['q4'])
@@ -156,7 +189,12 @@ describe('codex question items', () => {
 
   it('returns nothing when the request carries no questions at all', () => {
     expect(
-      codexQuestionItems({ threadId: THREAD_ID, promptKey: CODEX_ITEM_ID, params: {} })
+      codexQuestionItems({
+        threadId: THREAD_ID,
+        promptKey: CODEX_ITEM_ID,
+        params: {},
+        limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      })
     ).toEqual([])
   })
 
@@ -173,7 +211,8 @@ describe('codex question items', () => {
             options: [{ label: 'Known' }, { label: 'Other', isOther: true }]
           }
         ]
-      }
+      },
+      limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
     })
 
     expect(withoutOptions?.body).toMatchObject({ options: [], freeTextQuestionId: 'q1' })
@@ -197,7 +236,8 @@ describe('codex question items', () => {
             options: Array.from({ length: 80 }, () => ({ label: longLabel }))
           }
         ]
-      }
+      },
+      limits: UNRETAINED_JOURNAL_PAYLOAD_LIMITS
     })
     const item = items[0]
 
diff --git a/src/main/codex/codex-structured-prompt-items.ts b/src/main/codex/codex-structured-prompt-items.ts
index d088c6684fc..2c70cf2b957 100644
--- a/src/main/codex/codex-structured-prompt-items.ts
+++ b/src/main/codex/codex-structured-prompt-items.ts
@@ -6,7 +6,7 @@ import type {
 } from '../../shared/agent-session-journal-types'
 import {
   boundInlineText,
-  DEFAULT_JOURNAL_PAYLOAD_LIMITS
+  type JournalPayloadLimits
 } from '../native-chat/agent-session-journal/journal-payload-bounds'
 import {
   CODEX_APPROVAL_DECISIONS,
@@ -40,7 +40,7 @@ const PENDING = {
 
 const MAX_CODEX_PROMPT_QUESTIONS = 64
 const MAX_CODEX_PROMPT_OPTIONS = 64
-const PROMPT_OPTION_LIMITS = { ...DEFAULT_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 1024 }
+const PROMPT_OPTION_INLINE_HEAD_BYTES = 1024
 
 function readParams(params: unknown): Record<string, unknown> {
   return typeof params === 'object' && params !== null ? (params as Record<string, unknown>) : {}
@@ -51,12 +51,13 @@ function readString(source: Record<string, unknown>, key: string): string | null
   return typeof value === 'string' && value.length > 0 ? value : null
 }
 
-function boundPromptText(value: string): string {
-  return boundInlineText(value, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text
+function boundPromptText(value: string, limits: JournalPayloadLimits): string {
+  return boundInlineText(value, limits).text
 }
 
-function boundPromptOptionLabel(value: string): string {
-  return boundInlineText(value, PROMPT_OPTION_LIMITS).text
+function boundPromptOptionLabel(value: string, limits: JournalPayloadLimits): string {
+  return boundInlineText(value, { ...limits, inlineHeadBytes: PROMPT_OPTION_INLINE_HEAD_BYTES })
+    .text
 }
 
 /**
@@ -82,6 +83,7 @@ export function codexApprovalItem(input: {
   /** What is being approved, taken from the item Codex already announced —
    *  the approval request itself does not repeat the command or the patch. */
   detail: string | null
+  limits: JournalPayloadLimits
 }): AgentJournalApprovalItem {
   const params = readParams(input.params)
   return {
@@ -92,14 +94,17 @@ export function codexApprovalItem(input: {
         : input.method === CODEX_COMMAND_APPROVAL_METHOD
           ? 'Run a command?'
           : 'Approve this action?',
-    detail: boundNullablePromptText(approvalDetail(params) ?? input.detail),
+    detail: boundNullablePromptText(approvalDetail(params) ?? input.detail, input.limits),
     options: codexApprovalOptions(input.params),
     resolution: { ...PENDING }
   }
 }
 
-function boundNullablePromptText(value: string | null): string | null {
-  return value === null ? null : boundPromptText(value)
+function boundNullablePromptText(
+  value: string | null,
+  limits: JournalPayloadLimits
+): string | null {
+  return value === null ? null : boundPromptText(value, limits)
 }
 
 function approvalDetail(params: Record<string, unknown>): string | null {
@@ -134,6 +139,7 @@ export function codexQuestionItems(input: {
   threadId: string
   promptKey: string
   params: unknown
+  limits: JournalPayloadLimits
 }): CodexQuestionItem[] {
   const questions = readParams(input.params).questions
   if (!Array.isArray(questions)) {
@@ -152,8 +158,8 @@ export function codexQuestionItems(input: {
       identity: codexPromptIdentity({ ...input, questionId }),
       body: {
         kind: 'question',
-        question: boundPromptText(prompt),
-        options: questionOptions(question, questionId),
+        question: boundPromptText(prompt, input.limits),
+        options: questionOptions(question, questionId, input.limits),
         ...(questionAllowsFreeText(question)
           ? { freeTextQuestionId: codexJournalPromptIdPart(questionId) }
           : {}),
@@ -175,7 +181,8 @@ function questionAllowsFreeText(question: Record<string, unknown>): boolean {
 
 function questionOptions(
   question: Record<string, unknown>,
-  questionId: string
+  questionId: string,
+  limits: JournalPayloadLimits
 ): AgentJournalPromptOption[] {
   const options = question.options
   if (!Array.isArray(options)) {
@@ -193,7 +200,7 @@ function questionOptions(
       // question id, and the client only ever hands back an option id.
       mapped.push({
         id: encodeCodexJournalQuestionOptionId(questionId, label),
-        label: boundPromptOptionLabel(label)
+        label: boundPromptOptionLabel(label, limits)
       })
     }
   }
diff --git a/src/main/codex/codex-tool-identity-translation.test.ts b/src/main/codex/codex-tool-identity-translation.test.ts
index 751886f35aa..7852c4b6666 100644
--- a/src/main/codex/codex-tool-identity-translation.test.ts
+++ b/src/main/codex/codex-tool-identity-translation.test.ts
@@ -1,6 +1,7 @@
 import { describe, expect, it } from 'vitest'
 import { codexItemBody, codexStreamingJournalItem } from './codex-structured-item-translation'
 import { boundStreamItem } from './codex-structured-item-stream-bounds'
+import { UNRETAINED_JOURNAL_PAYLOAD_LIMITS } from '../native-chat/agent-session-journal/journal-payload-bounds'
 
 const command = {
   type: 'commandExecution',
@@ -11,7 +12,9 @@ const command = {
 
 describe('command row metadata', () => {
   it.each([0, 127, -1])('preserves exit %s with provider duration', (exitCode) => {
-    expect(codexItemBody({ ...command, exitCode, durationMs: 400 })).toMatchObject({
+    expect(
+      codexItemBody({ ...command, exitCode, durationMs: 400 }, UNRETAINED_JOURNAL_PAYLOAD_LIMITS)
+    ).toMatchObject({
       kind: 'tool-call',
       name: 'shell',
       exitCode,
@@ -25,7 +28,7 @@ describe('command row metadata', () => {
       { exitCode: null, durationMs: null },
       { exitCode: 1.5, durationMs: -1 }
     ]) {
-      const body = codexItemBody({ ...command, ...fields })
+      const body = codexItemBody({ ...command, ...fields }, UNRETAINED_JOURNAL_PAYLOAD_LIMITS)
       expect(body).not.toHaveProperty('exitCode')
       expect(body).not.toHaveProperty('durationMs')
     }
@@ -38,19 +41,24 @@ describe('command row metadata', () => {
       aggregatedOutput: 'x'.repeat(70000)
     }
     expect(boundStreamItem(source)).toMatchObject({ exitCode: 0, durationMs: 400 })
-    expect(codexStreamingJournalItem(source, 'output').body).toMatchObject({
+    expect(
+      codexStreamingJournalItem(source, 'output', UNRETAINED_JOURNAL_PAYLOAD_LIMITS).body
+    ).toMatchObject({
       exitCode: 0,
       durationMs: 400
     })
   })
   it('keeps metadata on classified exec rows', () => {
     expect(
-      codexItemBody({
-        ...command,
-        exitCode: 0,
-        durationMs: 15,
-        commandActions: [{ type: 'read', command: 'cat a.ts', name: 'a.ts', path: 'a.ts' }]
-      })
+      codexItemBody(
+        {
+          ...command,
+          exitCode: 0,
+          durationMs: 15,
+          commandActions: [{ type: 'read', command: 'cat a.ts', name: 'a.ts', path: 'a.ts' }]
+        },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toMatchObject({ name: 'read', exitCode: 0, durationMs: 15 })
   })
 })
@@ -58,13 +66,16 @@ describe('command row metadata', () => {
 describe('web result annotations', () => {
   it('adds safe result annotations and retains old-reader JSON output', () => {
     const results = [{ title: 'Docs', url: 'https://example.com/' }, { url: 'javascript:alert(1)' }]
-    const body = codexItemBody({
-      type: 'webSearch',
-      id: 'web',
-      query: 'docs',
-      action: { type: 'search' },
-      results
-    })
+    const body = codexItemBody(
+      {
+        type: 'webSearch',
+        id: 'web',
+        query: 'docs',
+        action: { type: 'search' },
+        results
+      },
+      UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+    )
     expect(body).toMatchObject({
       kind: 'tool-call',
       name: 'web_search',
@@ -75,18 +86,26 @@ describe('web result annotations', () => {
   })
   it('leaves legacy and malformed results without an annotation', () => {
     expect(
-      codexItemBody({ type: 'webSearch', id: 'web', query: 'docs', results: [{}] })
+      codexItemBody(
+        { type: 'webSearch', id: 'web', query: 'docs', results: [{}] },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).not.toHaveProperty('webSearchResults')
   })
 })
 
 it('annotates only confirmed MCP calls and retains the raw server/tool name', () => {
   expect(
-    codexItemBody({ type: 'mcpToolCall', id: 'm', server: 'my_server', tool: 'ns.tool' })
+    codexItemBody(
+      { type: 'mcpToolCall', id: 'm', server: 'my_server', tool: 'ns.tool' },
+      UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+    )
   ).toMatchObject({
     kind: 'tool-call',
     name: 'my_server/ns.tool',
     mcpIdentity: { server: 'my_server', tool: 'ns.tool' }
   })
-  expect(codexItemBody(command)).not.toHaveProperty('mcpIdentity')
+  expect(codexItemBody(command, UNRETAINED_JOURNAL_PAYLOAD_LIMITS)).not.toHaveProperty(
+    'mcpIdentity'
+  )
 })
diff --git a/src/main/codex/codex-turn-ordinals.ts b/src/main/codex/codex-turn-ordinals.ts
index 89ed72666db..cdc27e97a39 100644
--- a/src/main/codex/codex-turn-ordinals.ts
+++ b/src/main/codex/codex-turn-ordinals.ts
@@ -1,3 +1,4 @@
+import { JOURNAL_OVERFLOW_NOT_RETAINED } from '../native-chat/agent-session-journal/journal-overflow-store'
 import {
   boundPayload,
   digestPayload
@@ -32,7 +33,9 @@ export class CodexTurnOrdinals {
     const suffix = `#${digestPayload(value).slice(0, 24)}`
     return `${
       boundPayload(encoded, {
-        inlineHeadBytes: 256 - Buffer.byteLength(suffix, 'utf8')
+        inlineHeadBytes: 256 - Buffer.byteLength(suffix, 'utf8'),
+        // A turn key; the digest suffix carries what the clip drops.
+        overflow: JOURNAL_OVERFLOW_NOT_RETAINED
       }).head
     }${suffix}`
   }
diff --git a/src/main/native-chat/agent-session-journal/journal-legacy-import.test.ts b/src/main/native-chat/agent-session-journal/journal-legacy-import.test.ts
index 13673626ebc..6a62727d317 100644
--- a/src/main/native-chat/agent-session-journal/journal-legacy-import.test.ts
+++ b/src/main/native-chat/agent-session-journal/journal-legacy-import.test.ts
@@ -16,7 +16,7 @@ import {
   appendLegacyTranscriptMessages,
   importLegacyTranscriptIntoJournal
 } from './journal-legacy-import'
-import { DEFAULT_JOURNAL_PAYLOAD_LIMITS } from './journal-payload-bounds'
+import { UNRETAINED_JOURNAL_PAYLOAD_LIMITS } from './journal-payload-bounds'
 import { openAgentSessionJournal } from './journal-store-factory'
 import type { AgentSessionJournal } from './journal-store'
 
@@ -419,7 +419,10 @@ describe('payload bounds on import', () => {
       agent: 'claude',
       sessionId: CLAUDE_SESSION,
       fence: 1,
-      options: { filePath, limits: { ...DEFAULT_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 1_024 } }
+      options: {
+        filePath,
+        limits: { ...UNRETAINED_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 1_024 }
+      }
     })
 
     const item = journal.snapshot().items[0]
@@ -540,7 +543,7 @@ describe('import failures', () => {
 
   it('bounds oversized legacy tool-call input before journal publication', async () => {
     const journalDir = join(root, 'bounded-tool-input-journal')
-    const limits = { ...DEFAULT_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 64 }
+    const limits = { ...UNRETAINED_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 64 }
     const journal = await open('claude', CLAUDE_SESSION, { journalDir })
     const filePath = await writeFixture('oversized-tool-input.jsonl', [
       {
@@ -650,7 +653,7 @@ describe('import failures', () => {
 // row that also has text, and omp's execution cells always pair the invocation
 // with its output — so the multi-block path carries untrusted tool input too.
 describe('multi-block legacy messages', () => {
-  const limits = { ...DEFAULT_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 64 }
+  const limits = { ...UNRETAINED_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 64 }
   const oversized = 'x'.repeat(10_000)
 
   /** The tool-call block of the first imported multi-block message. */
diff --git a/src/main/native-chat/agent-session-journal/journal-legacy-import.ts b/src/main/native-chat/agent-session-journal/journal-legacy-import.ts
index 801c91fb534..d08366c5ee8 100644
--- a/src/main/native-chat/agent-session-journal/journal-legacy-import.ts
+++ b/src/main/native-chat/agent-session-journal/journal-legacy-import.ts
@@ -35,9 +35,13 @@ import {
   boundInlineText,
   boundPayload,
   boundToolInput,
-  DEFAULT_JOURNAL_PAYLOAD_LIMITS,
+  UNRETAINED_JOURNAL_PAYLOAD_LIMITS,
   type JournalPayloadLimits
 } from './journal-payload-bounds'
+
+// The bounds here retain nothing on purpose: the provider's transcript file is
+// the durable copy, it is what this import reads, Orca never deletes it, and the
+// remnant disclosure names its path in the timeline.
 import type { AgentSessionJournal } from './journal-store'
 
 export type LegacyImportOptions = ResolveSessionFileOptions & {
@@ -78,7 +82,7 @@ export async function appendLegacyTranscriptMessages(input: {
         sessionId: input.sessionId,
         recordId: message.id
       },
-      legacyItemBody(message, DEFAULT_JOURNAL_PAYLOAD_LIMITS),
+      legacyItemBody(message, UNRETAINED_JOURNAL_PAYLOAD_LIMITS),
       { fence: input.fence, observedAt: message.timestamp ?? undefined }
     )
     appended += 1
@@ -112,7 +116,7 @@ export async function prepareLegacyTranscriptImport(input: {
   options?: LegacyImportOptions
 }): Promise<{ ok: true; items: JournalReplacementItem[] } | { ok: false; error: string }> {
   const options = input.options ?? {}
-  const limits = options.limits ?? DEFAULT_JOURNAL_PAYLOAD_LIMITS
+  const limits = options.limits ?? UNRETAINED_JOURNAL_PAYLOAD_LIMITS
   const transcriptAgent = resolveNativeChatTranscriptAgent(input.agent)
   if (!transcriptAgent) {
     return { ok: false, error: `Unsupported agent for journal import: ${input.agent}` }
diff --git a/src/main/native-chat/agent-session-journal/journal-overflow-store.test.ts b/src/main/native-chat/agent-session-journal/journal-overflow-store.test.ts
new file mode 100644
index 00000000000..3a8c112d1be
--- /dev/null
+++ b/src/main/native-chat/agent-session-journal/journal-overflow-store.test.ts
@@ -0,0 +1,112 @@
+// The remainder of a bounded payload is retained, not dropped.
+
+import { mkdtemp, readdir, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { afterEach, beforeEach, describe, expect, it } from 'vitest'
+import {
+  JOURNAL_OVERFLOW_NOT_RETAINED,
+  journalOverflowDirectory,
+  journalOverflowSink,
+  readJournalOverflow
+} from './journal-overflow-store'
+import { boundInlineText, boundPayload, digestPayload } from './journal-payload-bounds'
+
+let root: string
+
+beforeEach(async () => {
+  root = await mkdtemp(join(tmpdir(), 'orca-journal-overflow-'))
+})
+
+afterEach(async () => {
+  await rm(root, { recursive: true, force: true })
+})
+
+describe('bounding a payload larger than the row budget', () => {
+  const limits = (dir: string, quota?: number) => ({
+    inlineHeadBytes: 16,
+    overflow: journalOverflowSink(dir, quota)
+  })
+
+  it('retains every byte the clip drops, readable back by the row digest', () => {
+    const payload = `${'x'.repeat(4_096)}λ tail`
+    const bounded = boundPayload(payload, limits(root))
+
+    expect(bounded.truncated).toBe(true)
+    expect(bounded.head).toHaveLength(16)
+    expect(bounded.spilled).toBe(true)
+    // The whole payload, not the clipped head: this is the P0.
+    expect(readJournalOverflow(root, bounded.digest)).toBe(payload)
+    expect(bounded.digest).toBe(digestPayload(payload))
+  })
+
+  it('retains the text behind an inline truncation marker too', () => {
+    const payload = 'assistant output '.repeat(400)
+    const { text, bounded } = boundInlineText(payload, limits(root))
+
+    expect(text).toContain('[Orca: output truncated')
+    expect(readJournalOverflow(root, bounded.digest)).toBe(payload)
+  })
+
+  it('leaves a payload that fits inline with nothing retained', () => {
+    const bounded = boundPayload('short', limits(root))
+
+    expect(bounded).toMatchObject({ truncated: false, head: 'short' })
+    expect(bounded.spilled).toBeUndefined()
+    expect(readJournalOverflow(root, bounded.digest)).toBeNull()
+  })
+
+  it('retains identical payloads once, so item revisions do not accumulate copies', async () => {
+    const payload = 'y'.repeat(4_096)
+    boundPayload(payload, limits(root))
+    boundPayload(payload, limits(root))
+    boundPayload(payload, limits(root))
+
+    expect(await readdir(journalOverflowDirectory(root))).toHaveLength(1)
+  })
+
+  it('marks the row unspilled rather than failing when retention cannot happen', async () => {
+    // A file where the store needs its directory: every write below fails.
+    await writeFile(journalOverflowDirectory(root), 'not a directory')
+    const payload = 'z'.repeat(4_096)
+    const bounded = boundPayload(payload, limits(root))
+
+    expect(bounded).toMatchObject({ truncated: true, byteLength: 4_096 })
+    expect(bounded.spilled).toBeUndefined()
+    expect(readJournalOverflow(root, bounded.digest)).toBeNull()
+  })
+
+  it('sheds the oldest retained payloads to stay inside the quota', async () => {
+    const quota = 6_000
+    const first = boundPayload('a'.repeat(4_000), limits(root, quota))
+    const second = boundPayload('b'.repeat(4_000), limits(root, quota))
+
+    expect(second.spilled).toBe(true)
+    expect(readJournalOverflow(root, second.digest)).toBe('b'.repeat(4_000))
+    // Two 4 KB payloads do not fit in a 6 KB budget; the older one goes.
+    expect(readJournalOverflow(root, first.digest)).toBeNull()
+    expect(await readdir(journalOverflowDirectory(root))).toHaveLength(1)
+  })
+
+  it('refuses a single payload larger than the whole quota without evicting for it', () => {
+    const quota = 2_000
+    const kept = boundPayload('a'.repeat(1_000), limits(root, quota))
+    const oversized = boundPayload('b'.repeat(9_000), limits(root, quota))
+
+    expect(oversized).toMatchObject({ truncated: true, byteLength: 9_000 })
+    expect(oversized.spilled).toBeUndefined()
+    expect(readJournalOverflow(root, kept.digest)).toBe('a'.repeat(1_000))
+  })
+})
+
+describe('a bound that deliberately retains nothing', () => {
+  it('still reports the clip, its length and its digest', () => {
+    const bounded = boundPayload('k'.repeat(4_096), {
+      inlineHeadBytes: 16,
+      overflow: JOURNAL_OVERFLOW_NOT_RETAINED
+    })
+
+    expect(bounded).toMatchObject({ truncated: true, byteLength: 4_096 })
+    expect(bounded.spilled).toBeUndefined()
+  })
+})
diff --git a/src/main/native-chat/agent-session-journal/journal-overflow-store.ts b/src/main/native-chat/agent-session-journal/journal-overflow-store.ts
new file mode 100644
index 00000000000..2991b667eb2
--- /dev/null
+++ b/src/main/native-chat/agent-session-journal/journal-overflow-store.ts
@@ -0,0 +1,144 @@
+// Durable home for payload bytes the live timeline cannot hold.
+//
+// A row every reconnecting client replays must stay small, so an oversized tool
+// result, diff, or assistant message is clipped to a head. The remainder is
+// written HERE first, addressed by the sha256 the bound already computes, so the
+// clip is a display bound rather than a delete.
+//
+// Content addressing makes retention idempotent: an item republished at a new
+// revision, or two tools returning the same output, retain once. The store lives
+// inside the session's journal directory, so removing a session removes its
+// payloads with it and nothing has to reference-count them.
+//
+// Retention is best effort BY DESIGN. A failed write leaves the row exactly as
+// it is bounded today and never worse, because refusing the append instead would
+// turn a full disk into a lost turn.
+
+import { existsSync, mkdirSync, readdirSync, renameSync, rmSync, statSync } from 'node:fs'
+import { closeSync, fsyncSync, openSync, readFileSync, writeSync } from 'node:fs'
+import { join } from 'node:path'
+
+const OVERFLOW_DIR_NAME = 'overflow'
+
+/** Per-session budget for retained remainders. Oldest are evicted first; the
+ *  rows keep their head, byte length and digest either way. */
+export const JOURNAL_OVERFLOW_QUOTA_BYTES = 64 * 1024 * 1024
+
+/** Where the remainder of a bounded payload goes. `retain` answers whether the
+ *  bytes are now durable, which is what the row records as `spilled`. */
+export type JournalOverflowSink = {
+  retain: (digest: string, payload: string) => boolean
+}
+
+/** For bounds applied to derived identifiers — a prompt option id, a turn
+ *  ordinal map, an image reference — where the clipped tail is a key fragment
+ *  and not user data. Named so the choice is visible at the call site. */
+export const JOURNAL_OVERFLOW_NOT_RETAINED: JournalOverflowSink = { retain: () => false }
+
+export function journalOverflowDirectory(journalDir: string): string {
+  return join(journalDir, OVERFLOW_DIR_NAME)
+}
+
+export function journalOverflowFile(journalDir: string, digest: string): string {
+  return join(journalOverflowDirectory(journalDir), `${digest}.txt`)
+}
+
+/** Retained bytes for a digest, or null when the payload was never retained or
+ *  has since been evicted. */
+export function readJournalOverflow(journalDir: string, digest: string): string | null {
+  try {
+    return readFileSync(journalOverflowFile(journalDir, digest), 'utf8')
+  } catch {
+    return null
+  }
+}
+
+export function journalOverflowSink(
+  journalDir: string,
+  quotaBytes: number = JOURNAL_OVERFLOW_QUOTA_BYTES
+): JournalOverflowSink {
+  return {
+    retain: (digest, payload) => retainJournalOverflow(journalDir, digest, payload, quotaBytes)
+  }
+}
+
+function retainJournalOverflow(
+  journalDir: string,
+  digest: string,
+  payload: string,
+  quotaBytes: number
+): boolean {
+  const bytes = Buffer.from(payload, 'utf8')
+  // A single payload larger than the whole budget would evict everything else
+  // to store one item; the row's head, length and digest still describe it.
+  if (bytes.byteLength > quotaBytes) {
+    return false
+  }
+  const file = journalOverflowFile(journalDir, digest)
+  try {
+    if (existsSync(file)) {
+      return true
+    }
+    const directory = journalOverflowDirectory(journalDir)
+    mkdirSync(directory, { recursive: true })
+    evictJournalOverflow(directory, quotaBytes - bytes.byteLength)
+    writeOverflowFile(directory, file, digest, bytes)
+    return true
+  } catch {
+    return false
+  }
+}
+
+/** Durable before the rename, so a reader never sees a half-written payload
+ *  under a digest that claims to describe it. */
+function writeOverflowFile(directory: string, file: string, digest: string, bytes: Buffer): void {
+  const staging = join(directory, `${digest}.${process.pid}.partial`)
+  const handle = openSync(staging, 'w')
+  try {
+    writeSync(handle, bytes)
+    fsyncSync(handle)
+  } finally {
+    closeSync(handle)
+  }
+  try {
+    renameSync(staging, file)
+  } catch (error) {
+    rmSync(staging, { force: true })
+    throw error
+  }
+}
+
+/** Oldest-first, down to `budget`. Retained payloads are recoverable evidence,
+ *  not the timeline: shedding the oldest is how the sidecar stays bounded. */
+function evictJournalOverflow(directory: string, budget: number): void {
+  const entries: { path: string; bytes: number; modifiedAt: number }[] = []
+  let total = 0
+  for (const name of readdirSync(directory)) {
+    const path = join(directory, name)
+    try {
+      const stats = statSync(path)
+      if (!stats.isFile()) {
+        continue
+      }
+      entries.push({ path, bytes: stats.size, modifiedAt: stats.mtimeMs })
+      total += stats.size
+    } catch {
+      // Raced with another eviction; it is already gone.
+    }
+  }
+  if (total <= budget) {
+    return
+  }
+  entries.sort((a, b) => a.modifiedAt - b.modifiedAt)
+  for (const entry of entries) {
+    if (total <= budget) {
+      return
+    }
+    try {
+      rmSync(entry.path, { force: true })
+      total -= entry.bytes
+    } catch {
+      // Left in place; the next retention pass tries again.
+    }
+  }
+}
diff --git a/src/main/native-chat/agent-session-journal/journal-payload-bounds.ts b/src/main/native-chat/agent-session-journal/journal-payload-bounds.ts
index ea09ecf6df3..afc0307df65 100644
--- a/src/main/native-chat/agent-session-journal/journal-payload-bounds.ts
+++ b/src/main/native-chat/agent-session-journal/journal-payload-bounds.ts
@@ -2,19 +2,37 @@
 //
 // A 40 MB tool result must not be inlined into a row that every reconnecting
 // client replays. A bounded payload keeps a head plus the original byte length
-// and digest; the remainder is discarded. Crossing a bound is always marked —
-// never a silent drop.
+// and digest, and the remainder goes to the session's overflow store BEFORE the
+// clip — so the bound is what a client renders, never what survives on the host.
+//
+// The sink is part of `JournalPayloadLimits` rather than a default, because the
+// question "where does the remainder go?" has to be answered at the call site.
+// A bound applied to a derived identifier answers it with
+// `UNRETAINED_JOURNAL_PAYLOAD_LIMITS`, which is a visible, reviewable choice.
 
 import { createHash } from 'node:crypto'
 import type { AgentJournalBoundedPayload } from '../../../shared/agent-session-journal-types'
+import { JOURNAL_OVERFLOW_NOT_RETAINED, type JournalOverflowSink } from './journal-overflow-store'
 
 export type JournalPayloadLimits = {
   /** Bytes of the payload kept inline on the row. */
   inlineHeadBytes: number
+  /** Where the clipped remainder is retained. */
+  overflow: JournalOverflowSink
 }
 
-export const DEFAULT_JOURNAL_PAYLOAD_LIMITS: JournalPayloadLimits = {
-  inlineHeadBytes: 16 * 1024
+export const DEFAULT_JOURNAL_INLINE_HEAD_BYTES = 16 * 1024
+
+/** The row budget, retaining everything it clips into `overflow`. */
+export function journalPayloadLimits(overflow: JournalOverflowSink): JournalPayloadLimits {
+  return { inlineHeadBytes: DEFAULT_JOURNAL_INLINE_HEAD_BYTES, overflow }
+}
+
+/** For bounds whose clipped tail is a derived key fragment — a prompt option id,
+ *  a turn ordinal map, an image reference — and not user data. */
+export const UNRETAINED_JOURNAL_PAYLOAD_LIMITS: JournalPayloadLimits = {
+  inlineHeadBytes: DEFAULT_JOURNAL_INLINE_HEAD_BYTES,
+  overflow: JOURNAL_OVERFLOW_NOT_RETAINED
 }
 
 /** Marker appended to a clipped inline string so the UI never presents a
@@ -28,8 +46,9 @@ export function digestPayload(payload: string): string {
   return createHash('sha256').update(payload, 'utf8').digest('hex')
 }
 
-/** Clip `payload` to the inline head. `truncated` means the remainder was
- *  discarded; `digest` and `byteLength` describe the original. */
+/** Clip `payload` to the inline head, retaining the whole of it under `digest`
+ *  first. `spilled` says the retention succeeded; without it the row is exactly
+ *  the head, length and digest it would have carried before. */
 export function boundPayload(
   payload: string,
   limits: JournalPayloadLimits
@@ -39,11 +58,14 @@ export function boundPayload(
   if (buffer.byteLength <= limits.inlineHeadBytes) {
     return { head: payload, byteLength: buffer.byteLength, digest, truncated: false }
   }
+  // Retain BEFORE the clip: this is the last point that holds the whole payload.
+  const spilled = limits.overflow.retain(digest, payload)
   return {
     head: clipUtf8(buffer, limits.inlineHeadBytes),
     byteLength: buffer.byteLength,
     digest,
-    truncated: true
+    truncated: true,
+    ...(spilled ? { spilled: true as const } : {})
   }
 }
 
@@ -82,7 +104,8 @@ export function boundToolInput(input: unknown, limits: JournalPayloadLimits): un
         truncated: true,
         byteLength: bounded.byteLength,
         digest: bounded.digest,
-        head: bounded.head
+        head: bounded.head,
+        ...(bounded.spilled ? { spilled: true as const } : {})
       }
     : input
 }
diff --git a/src/main/native-chat/agent-session-journal/journal-prompt-body-bounds.ts b/src/main/native-chat/agent-session-journal/journal-prompt-body-bounds.ts
index 58d12dfcf89..a234d058fa9 100644
--- a/src/main/native-chat/agent-session-journal/journal-prompt-body-bounds.ts
+++ b/src/main/native-chat/agent-session-journal/journal-prompt-body-bounds.ts
@@ -7,12 +7,17 @@ import type {
 import {
   boundInlineText,
   boundPayload,
-  DEFAULT_JOURNAL_PAYLOAD_LIMITS
+  UNRETAINED_JOURNAL_PAYLOAD_LIMITS
 } from './journal-payload-bounds'
 
+// Everything here retains nothing, and both cases are bounded already:
+// `boundJournalStatusText` bounds Orca's own short status sentences, and
+// `cancelledJournalPromptBody` re-bounds a body the journal bounded on the way
+// in. Neither is the last holder of any bytes.
+
 export const MAX_JOURNAL_PROMPT_OPTIONS = 64
 
-const JOURNAL_PROMPT_OPTION_LIMITS = { inlineHeadBytes: 1024 }
+const JOURNAL_PROMPT_OPTION_LIMITS = { ...UNRETAINED_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 1024 }
 const JOURNAL_PROMPT_ID_MAX_BYTES = 1024
 
 export function cancelledJournalPromptBody(
@@ -34,7 +39,7 @@ export function cancelledJournalPromptBody(
 }
 
 export function boundJournalStatusText(text: string): string {
-  return boundInlineText(text, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text
+  return boundInlineText(text, UNRETAINED_JOURNAL_PAYLOAD_LIMITS).text
 }
 
 function boundJournalPromptBody(
@@ -68,13 +73,16 @@ function boundPromptOptions(
 }
 
 function boundPromptText(value: string): string {
-  return boundInlineText(value, DEFAULT_JOURNAL_PAYLOAD_LIMITS).text
+  return boundInlineText(value, UNRETAINED_JOURNAL_PAYLOAD_LIMITS).text
 }
 
 function boundPromptIdentifier(value: string): string {
   if (Buffer.byteLength(value, 'utf8') <= JOURNAL_PROMPT_ID_MAX_BYTES) {
     return value
   }
-  const bounded = boundPayload(value, { inlineHeadBytes: JOURNAL_PROMPT_ID_MAX_BYTES - 33 })
+  const bounded = boundPayload(value, {
+    ...UNRETAINED_JOURNAL_PAYLOAD_LIMITS,
+    inlineHeadBytes: JOURNAL_PROMPT_ID_MAX_BYTES - 33
+  })
   return `${bounded.head}#${bounded.digest.slice(0, 32)}`
 }
diff --git a/src/main/native-chat/agent-session-journal/journal-repair-marker.ts b/src/main/native-chat/agent-session-journal/journal-repair-marker.ts
index f9ef09e688d..5433b0e1a5e 100644
--- a/src/main/native-chat/agent-session-journal/journal-repair-marker.ts
+++ b/src/main/native-chat/agent-session-journal/journal-repair-marker.ts
@@ -14,7 +14,6 @@
 // sequence owns the epoch and stops the retry.
 
 import type Database from '../../sqlite/sync-database'
-import { deleteJournalRowSuffix } from './journal-row-table'
 
 const SELECT_REPAIR = 'SELECT epoch, content_from FROM journal_repairs WHERE session_id = ?'
 const UPSERT_REPAIR = `INSERT INTO journal_repairs (session_id, epoch, content_from, repaired_at)
@@ -45,25 +44,14 @@ export function clearJournalRepairMarker(db: Database.Database, sessionId: strin
   db.prepare(DELETE_REPAIR).run(sessionId)
 }
 
-/** Drop the rejected suffix and record that it is owed, atomically. */
-export function deleteJournalRepairedSuffix(input: {
-  db: Database.Database
-  sessionId: string
-  epoch: string
-  /** First sequence of the rejected suffix. */
-  fromSeq: number
-  /** First sequence left free once the suffix is gone. */
-  contentFrom: number
+/** Raise the marker inside the caller's repair transaction, so the rows and the
+ *  record that they are owed commit together. */
+export function writeJournalRepairMarker(
+  db: Database.Database,
+  sessionId: string,
+  epoch: string,
+  contentFrom: number,
   now: number
-}): number {
-  input.db.exec('BEGIN IMMEDIATE')
-  try {
-    const deleted = deleteJournalRowSuffix(input.db, input.sessionId, input.epoch, input.fromSeq)
-    input.db.prepare(UPSERT_REPAIR).run(input.sessionId, input.epoch, input.contentFrom, input.now)
-    input.db.exec('COMMIT')
-    return deleted
-  } catch (error) {
-    input.db.exec('ROLLBACK')
-    throw error
-  }
+): void {
+  db.prepare(UPSERT_REPAIR).run(sessionId, epoch, contentFrom, now)
 }
diff --git a/src/main/native-chat/agent-session-journal/journal-repair-suffix.ts b/src/main/native-chat/agent-session-journal/journal-repair-suffix.ts
new file mode 100644
index 00000000000..71843fbd7b4
--- /dev/null
+++ b/src/main/native-chat/agent-session-journal/journal-repair-suffix.ts
@@ -0,0 +1,53 @@
+// Dropping the rejected suffix a replay found — after it is durable elsewhere.
+//
+// Ordering is the whole contract: quarantine, fsync, THEN the transaction that
+// deletes the rows and records the rebuild they are owed. A repair that cannot
+// write the copy does not delete; it reports `quarantined: false` and the caller
+// latches read-only, which leaves the timeline exactly as it was found.
+
+import type Database from '../../sqlite/sync-database'
+import { quarantineJournalRows } from './journal-row-quarantine'
+import { writeJournalRepairMarker } from './journal-repair-marker'
+import { deleteJournalRowSuffix, readJournalRowsAfter } from './journal-row-table'
+
+export type JournalRepairedSuffix =
+  | { quarantined: true; quarantineFile: string; deleted: number }
+  /** The rows are still live and untouched. */
+  | { quarantined: false; error: unknown }
+
+export function quarantineAndDeleteJournalRepairedSuffix(input: {
+  db: Database.Database
+  journalDir: string
+  sessionId: string
+  epoch: string
+  /** First sequence of the rejected suffix. */
+  fromSeq: number
+  /** First sequence left free once the suffix is gone. */
+  contentFrom: number
+  now: number
+}): JournalRepairedSuffix {
+  let quarantineFile: string
+  try {
+    quarantineFile = quarantineJournalRows({
+      journalDir: input.journalDir,
+      epoch: input.epoch,
+      fromSeq: input.fromSeq,
+      now: input.now,
+      // `> fromSeq - 1` is `>= fromSeq`: the rejected row itself and everything
+      // behind it, which is exactly what the delete below removes.
+      rows: readJournalRowsAfter(input.db, input.sessionId, input.epoch, input.fromSeq - 1)
+    })
+  } catch (error) {
+    return { quarantined: false, error }
+  }
+  input.db.exec('BEGIN IMMEDIATE')
+  try {
+    const deleted = deleteJournalRowSuffix(input.db, input.sessionId, input.epoch, input.fromSeq)
+    writeJournalRepairMarker(input.db, input.sessionId, input.epoch, input.contentFrom, input.now)
+    input.db.exec('COMMIT')
+    return { quarantined: true, quarantineFile, deleted }
+  } catch (error) {
+    input.db.exec('ROLLBACK')
+    throw error
+  }
+}
diff --git a/src/main/native-chat/agent-session-journal/journal-row-quarantine.test.ts b/src/main/native-chat/agent-session-journal/journal-row-quarantine.test.ts
new file mode 100644
index 00000000000..cdc88556237
--- /dev/null
+++ b/src/main/native-chat/agent-session-journal/journal-row-quarantine.test.ts
@@ -0,0 +1,175 @@
+// A repair copies the rows it rejects before it drops them.
+//
+// The rejected row and every valid row behind it are the only copy of what the
+// session wrote after the fault — a submission receipt among them, which no
+// provider transcript can rebuild. These assert the copy exists, byte for byte,
+// and that a repair which cannot write one does not delete anything.
+
+import { chmod, mkdir, mkdtemp, readdir, readFile, rm } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { afterEach, beforeEach, expect, it } from 'vitest'
+import type {
+  AgentJournalItemBody,
+  AgentJournalItemIdentity,
+  AgentSessionJournalIdentity
+} from '../../../shared/agent-session-journal-types'
+import type Database from '../../sqlite/sync-database'
+import { openJournalDatabase } from './journal-database'
+import { journalDatabaseFile } from './journal-paths'
+import { journalQuarantineDirectory } from './journal-row-quarantine'
+import { createTrackedJournalOpener } from './journal-store-test-open'
+
+const IDENTITY: AgentSessionJournalIdentity = {
+  sessionId: 'session-1',
+  workspaceId: 'ws-1',
+  hostId: 'host-1',
+  agent: 'codex',
+  providerHandle: { kind: 'codex', threadId: 'thread-1' }
+}
+
+const CORRUPT_ROW = '}{ not a row λ'
+
+let root: string
+let clock = 1_000
+const journals = createTrackedJournalOpener()
+
+function tick(): number {
+  clock += 1
+  return clock
+}
+
+function item(ordinal: number): AgentJournalItemIdentity {
+  return { provider: 'codex', threadId: 'thread-1', turnId: 'turn-1', ordinal }
+}
+
+function body(value: string): AgentJournalItemBody {
+  return { kind: 'message', role: 'assistant', blocks: [{ type: 'text', text: value }] }
+}
+
+function open() {
+  return journals.open({
+    identity: IDENTITY,
+    journalDir: root,
+    now: tick,
+    mintEpoch: () => `epoch-${clock}`
+  })
+}
+
+async function withJournalDatabase<T>(run: (db: Database.Database) => T): Promise<T> {
+  const opened = openJournalDatabase(journalDatabaseFile(root))
+  try {
+    return run(opened.db)
+  } finally {
+    opened.db.close()
+  }
+}
+
+function storedRows(db: Database.Database): { seq: number; row_json: string }[] {
+  return db.prepare('SELECT seq, row_json FROM journal_rows ORDER BY seq').all() as {
+    seq: number
+    row_json: string
+  }[]
+}
+
+type QuarantinedRow = { epoch: string; seq: number; ts: number; rowJson: string }
+
+async function quarantinedRows(): Promise<QuarantinedRow[]> {
+  const directory = journalQuarantineDirectory(root)
+  const files = await readdir(directory)
+  expect(files).toHaveLength(1)
+  const contents = await readFile(join(directory, files[0]!), 'utf8')
+  return contents
+    .split('\n')
+    .filter((line) => line.length > 0)
+    .map((line) => JSON.parse(line) as QuarantinedRow)
+}
+
+/** A prefix, a row this build cannot parse, and valid rows behind it — one of
+ *  them an Orca-minted submission receipt. */
+async function seedCorruptedJournal(): Promise<void> {
+  const journal = await open()
+  await journal.appendItem(item(0), body('readable prefix'), { fence: 1 })
+  await journal.appendItem(item(1), body('the fault'), { fence: 1 })
+  await journal.appendSubmission({
+    clientMessageId: 'orca-only-receipt',
+    payloadFingerprint: 'fingerprint',
+    fence: 1,
+    body: { kind: 'message', role: 'user', blocks: [{ type: 'text', text: 'only in Orca' }] }
+  })
+  await journal.appendItem(item(2), body('valid suffix'), { fence: 1 })
+  await journal.close()
+  // Sequence 1 is the epoch row, so the fault lands at 3 and 4..5 are valid.
+  await withJournalDatabase((db) => {
+    db.prepare('UPDATE journal_rows SET row_json = ? WHERE seq = ?').run(CORRUPT_ROW, 3)
+  })
+}
+
+beforeEach(async () => {
+  root = await mkdtemp(join(tmpdir(), 'orca-journal-quarantine-'))
+  clock = 1_000
+})
+
+afterEach(async () => {
+  await journals.closeAll()
+  await chmod(journalQuarantineDirectory(root), 0o755).catch(() => undefined)
+  await rm(root, { recursive: true, force: true })
+})
+
+it('quarantines the rejected row and every valid row behind it, byte for byte', async () => {
+  await seedCorruptedJournal()
+  const before = await withJournalDatabase(storedRows)
+
+  const reopened = await open()
+  expect(reopened.repair.malformedRows).toBe(1)
+
+  const quarantined = await quarantinedRows()
+  expect(quarantined.map((row) => row.seq)).toEqual([3, 4, 5])
+  // The exact stored bytes, including the row that is not valid JSON.
+  expect(quarantined.map((row) => row.rowJson)).toEqual(
+    before.filter((row) => row.seq >= 3).map((row) => row.row_json)
+  )
+  expect(quarantined[0]?.rowJson).toBe(CORRUPT_ROW)
+  // The Orca-only submission receipt no provider transcript can rebuild.
+  expect(quarantined.some((row) => row.rowJson.includes('orca-only-receipt'))).toBe(true)
+  const sourceEpoch = before[0]?.row_json ?? ''
+  expect(quarantined.every((row) => sourceEpoch.includes(row.epoch))).toBe(true)
+})
+
+it('drops nothing and latches read-only when the copy cannot be written', async () => {
+  await seedCorruptedJournal()
+  const before = await withJournalDatabase(storedRows)
+  // A directory the store cannot create its file in.
+  await mkdir(journalQuarantineDirectory(root), { recursive: true })
+  await chmod(journalQuarantineDirectory(root), 0o500)
+
+  const reopened = await open()
+
+  expect(reopened.isReadOnly).toBe(true)
+  await expect(reopened.appendItem(item(9), body('refused'))).rejects.toMatchObject({
+    code: 'journal_read_only'
+  })
+  // Every row the repair would have deleted is still there, unchanged.
+  expect(await withJournalDatabase(storedRows)).toEqual(before)
+})
+
+it('quarantines the rows a sequence gap orphans, which carry no malformed row', async () => {
+  const journal = await open()
+  for (let ordinal = 0; ordinal < 5; ordinal += 1) {
+    await journal.appendItem(item(ordinal), body(`m${ordinal}`), { fence: 1 })
+  }
+  await journal.close()
+  // Items occupy 2..6; removing 4 leaves 5 and 6 valid but unanchored.
+  await withJournalDatabase((db) => {
+    db.prepare('DELETE FROM journal_rows WHERE seq = ?').run(4)
+  })
+  const before = await withJournalDatabase(storedRows)
+
+  await open()
+
+  const quarantined = await quarantinedRows()
+  expect(quarantined.map((row) => row.seq)).toEqual([5, 6])
+  expect(quarantined.map((row) => row.rowJson)).toEqual(
+    before.filter((row) => row.seq >= 5).map((row) => row.row_json)
+  )
+})
diff --git a/src/main/native-chat/agent-session-journal/journal-row-quarantine.ts b/src/main/native-chat/agent-session-journal/journal-row-quarantine.ts
new file mode 100644
index 00000000000..2ab8c833c11
--- /dev/null
+++ b/src/main/native-chat/agent-session-journal/journal-row-quarantine.ts
@@ -0,0 +1,58 @@
+// The rejected rows a repair is about to drop, copied out first.
+//
+// Replay stops at the first row this build cannot represent, and the repair then
+// clears from there to the tip. Those rows are the ONLY copy of everything the
+// session wrote after the fault, Orca-only submission receipts included, and no
+// provider transcript can rebuild those. They are written here with their exact
+// stored bytes BEFORE the delete transaction opens: a crash between the two
+// leaves the rows still live plus an orphan quarantine file, never the reverse.
+//
+// A failed quarantine is a refusal to delete, not a reason to proceed — the
+// caller latches the journal read-only and the next open retries.
+
+import { closeSync, fsyncSync, mkdirSync, openSync, writeSync } from 'node:fs'
+import { join } from 'node:path'
+import type { JournalStoredRow } from './journal-row-table'
+
+const QUARANTINE_DIR_NAME = 'quarantine'
+
+export function journalQuarantineDirectory(journalDir: string): string {
+  return join(journalDir, QUARANTINE_DIR_NAME)
+}
+
+/**
+ * Copy `rows` to a durable file and return its path. Throws when the bytes are
+ * not durable, so no caller can read a path here as permission to delete.
+ *
+ * The stored `row_json` is carried as a JSON string rather than embedded JSON:
+ * a rejected row is very often not valid JSON, which is the whole reason it is
+ * being quarantined.
+ */
+export function quarantineJournalRows(input: {
+  journalDir: string
+  epoch: string
+  fromSeq: number
+  now: number
+  rows: readonly JournalStoredRow[]
+}): string {
+  const directory = journalQuarantineDirectory(input.journalDir)
+  mkdirSync(directory, { recursive: true })
+  const file = join(directory, quarantineFileName(input.epoch, input.fromSeq, input.now))
+  const lines = input.rows.map((row) =>
+    JSON.stringify({ epoch: row.epoch, seq: row.seq, ts: row.ts, rowJson: row.rowJson })
+  )
+  const handle = openSync(file, 'w')
+  try {
+    writeSync(handle, Buffer.from(`${lines.join('\n')}\n`, 'utf8'))
+    fsyncSync(handle)
+  } finally {
+    closeSync(handle)
+  }
+  return file
+}
+
+/** Epoch first so one session's repairs group together, and the rejected
+ *  sequence plus the clock keep repeated repairs of one epoch distinct. */
+function quarantineFileName(epoch: string, fromSeq: number, now: number): string {
+  return `${epoch}-${fromSeq}-${now}.jsonl`
+}
diff --git a/src/main/native-chat/agent-session-journal/journal-store-open.ts b/src/main/native-chat/agent-session-journal/journal-store-open.ts
index 7b5b6d0dff8..b27ab7f5a76 100644
--- a/src/main/native-chat/agent-session-journal/journal-store-open.ts
+++ b/src/main/native-chat/agent-session-journal/journal-store-open.ts
@@ -9,6 +9,7 @@ import {
   journalFileFormatRemnantDisclosure
 } from './journal-file-format-remnant'
 import type { JournalLoad } from './journal-open'
+import type { JournalRepairedSuffix } from './journal-repair-suffix'
 import { journalRepairDisclosure, type JournalRepairDisclosure } from './journal-repair-disclosure'
 import { staleSubagentRosterRevisions } from './journal-subagent-liveness'
 
@@ -32,11 +33,13 @@ export async function openJournalStoreState(input: {
   journalDir: string
   loaded: JournalLoad | null | undefined
   replay: () => JournalLoad | null
-  /** Drops the rejected suffix and records the rebuild it owes, in ONE
-   *  transaction. Corruption is not preserved; replay keeps reporting `corrupt`
+  /** Copies the rejected suffix somewhere durable, then drops it and records
+   *  the rebuild it owes in ONE transaction. Replay keeps reporting `corrupt`
    *  until provider history republishes the epoch or the session writes past
    *  `contentFrom`, the first sequence the repair left free. */
-  deleteSuffix: (fromSeq: number, contentFrom: number) => number
+  repairSuffix: (fromSeq: number, contentFrom: number) => JournalRepairedSuffix
+  /** Latches the journal against writes for the rest of its life. */
+  latchReadOnly: () => void
   start: () => void
   adopt: (loaded: JournalLoad) => void
   /** Republishes an anchor row for an epoch a repair emptied. */
@@ -60,7 +63,13 @@ export async function openJournalStoreState(input: {
   }
   input.adopt(loaded)
   if (loaded.truncateFrom !== undefined && !loaded.readOnly) {
-    input.deleteSuffix(loaded.truncateFrom, loaded.state.lastSequence + 1)
+    // The rejected rows are the only copy of everything the session wrote after
+    // the fault. Without a durable one this open takes no repair at all: the
+    // journal latches read-only with its rows intact, and a later open retries.
+    if (!input.repairSuffix(loaded.truncateFrom, loaded.state.lastSequence + 1).quarantined) {
+      input.latchReadOnly()
+      return
+    }
   }
   // A repair that took every live row leaves the epoch with no anchor. Publish
   // one before anything can append into it: an ordinary row at sequence 1 would
diff --git a/src/main/native-chat/agent-session-journal/journal-store-restore.ts b/src/main/native-chat/agent-session-journal/journal-store-restore.ts
index fc69dd339d8..645e282e8a8 100644
--- a/src/main/native-chat/agent-session-journal/journal-store-restore.ts
+++ b/src/main/native-chat/agent-session-journal/journal-store-restore.ts
@@ -10,7 +10,7 @@ import type { JournalEpochController } from './journal-epoch-controller'
 import { replayJournal } from './journal-open'
 import type { JournalStoreHost } from './journal-store-collaborators'
 import { openJournalStoreState } from './journal-store-open'
-import { deleteJournalRepairedSuffix } from './journal-repair-marker'
+import { quarantineAndDeleteJournalRepairedSuffix } from './journal-repair-suffix'
 
 export function restoreJournalStore(
   host: JournalStoreHost,
@@ -23,15 +23,17 @@ export function restoreJournalStore(
       const opened = host.database()
       return replayJournal(opened.db, opened.readOnly, host.identity.sessionId)
     },
-    deleteSuffix: (fromSeq, contentFrom) =>
-      deleteJournalRepairedSuffix({
+    repairSuffix: (fromSeq, contentFrom) =>
+      quarantineAndDeleteJournalRepairedSuffix({
         db: host.database().db,
+        journalDir: host.journalDir,
         sessionId: host.identity.sessionId,
         epoch: host.state().epoch,
         fromSeq,
         contentFrom,
         now: host.now()
       }),
+    latchReadOnly: () => host.setReadOnly(true),
     start: () => collaborators.epochController.start('session_created', 0),
     // `unreconcilable_prefix` is the durable statement that this epoch exists
     // because a repair emptied one: replay reads it back and keeps asking for
diff --git a/src/main/native-chat/agent-session-journal/journal-store.test.ts b/src/main/native-chat/agent-session-journal/journal-store.test.ts
index 97eac02fe75..22d664fe433 100644
--- a/src/main/native-chat/agent-session-journal/journal-store.test.ts
+++ b/src/main/native-chat/agent-session-journal/journal-store.test.ts
@@ -15,7 +15,7 @@ import { loadJournal } from './journal-open'
 import {
   boundInlineText,
   boundPayload,
-  DEFAULT_JOURNAL_PAYLOAD_LIMITS
+  UNRETAINED_JOURNAL_PAYLOAD_LIMITS
 } from './journal-payload-bounds'
 import { journalDatabaseFile, journalDirectoryFor, journalPathSegment } from './journal-paths'
 import { AgentSessionJournalError, type AgentSessionJournal } from './journal-store'
@@ -220,7 +220,7 @@ describe('replay', () => {
 
 describe('bounds', () => {
   it('marks a clipped payload instead of dropping bytes silently', () => {
-    const limits = { ...DEFAULT_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 16 }
+    const limits = { ...UNRETAINED_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 16 }
     const bounded = boundPayload('x'.repeat(4_096), limits)
     expect(bounded.truncated).toBe(true)
     expect(bounded.head).toHaveLength(16)
@@ -229,7 +229,7 @@ describe('bounds', () => {
   })
 
   it('never splits a multi-byte character across the bound', () => {
-    const limits = { ...DEFAULT_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 4 }
+    const limits = { ...UNRETAINED_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 4 }
     // Each character is three bytes, so a naive slice would land mid-sequence.
     const bounded = boundPayload('日本語テスト', limits)
     expect(bounded.head).toBe('日')
@@ -237,10 +237,10 @@ describe('bounds', () => {
   })
 
   it('leaves a payload inside the bound untouched', () => {
-    const bounded = boundPayload('small', DEFAULT_JOURNAL_PAYLOAD_LIMITS)
+    const bounded = boundPayload('small', UNRETAINED_JOURNAL_PAYLOAD_LIMITS)
     expect(bounded.truncated).toBe(false)
     expect(bounded.head).toBe('small')
-    expect(boundInlineText('small', DEFAULT_JOURNAL_PAYLOAD_LIMITS).text).toBe('small')
+    expect(boundInlineText('small', UNRETAINED_JOURNAL_PAYLOAD_LIMITS).text).toBe('small')
   })
 })
 
diff --git a/src/main/native-chat/agent-session-wire/provider-frame-disposition.test.ts b/src/main/native-chat/agent-session-wire/provider-frame-disposition.test.ts
index a57aa5d9ed1..87a502c50ed 100644
--- a/src/main/native-chat/agent-session-wire/provider-frame-disposition.test.ts
+++ b/src/main/native-chat/agent-session-wire/provider-frame-disposition.test.ts
@@ -7,6 +7,7 @@ import {
   PROVIDER_FRAME_CLASSIFICATIONS
 } from './provider-frame-disposition'
 import { unhandledProviderFrameJournalItem } from './unhandled-provider-frame'
+import { UNRETAINED_JOURNAL_PAYLOAD_LIMITS } from '../agent-session-journal/journal-payload-bounds'
 
 describe('provider frame classification catalog', () => {
   it('classifies every pinned Codex app-server notification method', () => {
@@ -206,10 +207,15 @@ describe('codex subagent item disposition', () => {
 
   it('journals no fallback row for subagent activity', () => {
     expect(
-      unhandledProviderFrameJournalItem('codex', 'item:subAgentActivity', {
-        kind: 'completed',
-        agentThreadId: 'child-1'
-      })
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'item:subAgentActivity',
+        {
+          kind: 'completed',
+          agentThreadId: 'child-1'
+        },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toBeNull()
   })
 
diff --git a/src/main/native-chat/agent-session-wire/structured-agent-session-event-sink-queue.ts b/src/main/native-chat/agent-session-wire/structured-agent-session-event-sink-queue.ts
index 510c1df2f4a..51a196ae685 100644
--- a/src/main/native-chat/agent-session-wire/structured-agent-session-event-sink-queue.ts
+++ b/src/main/native-chat/agent-session-wire/structured-agent-session-event-sink-queue.ts
@@ -7,6 +7,12 @@ import type {
   StructuredAgentSessionSinkState,
   StructuredAgentSessionSinkWatermarks
 } from './structured-agent-session-event-sink'
+import {
+  journalPayloadLimits,
+  UNRETAINED_JOURNAL_PAYLOAD_LIMITS,
+  type JournalPayloadLimits
+} from '../agent-session-journal/journal-payload-bounds'
+import { journalOverflowSink } from '../agent-session-journal/journal-overflow-store'
 
 export type StructuredAgentSessionSinkOperation = {
   sequence: number
@@ -26,6 +32,7 @@ export type StructuredAgentSessionDrainWaiter = {
 export class StructuredAgentSessionSinkQueue {
   private readingControl: StructuredAgentSessionReadingControl | undefined
   private target: StructuredAgentSessionEventTarget | null = null
+  private limits: JournalPayloadLimits | null = null
   private closed = false
   private failure: { error: unknown } | null = null
   private running = false
@@ -75,12 +82,26 @@ export class StructuredAgentSessionSinkQueue {
   bind(target: StructuredAgentSessionEventTarget): void {
     if (!this.closed) {
       this.target = target
+      this.limits = null
       this.pump()
     }
   }
 
   unbind(): void {
     this.target = null
+    this.limits = null
+  }
+
+  /** The row budget for the bound journal, so a clipped payload's remainder is
+   *  retained beside that journal rather than dropped. Unretained while nothing
+   *  is bound: there is no session directory to retain into yet. */
+  payloadLimits = (): JournalPayloadLimits => {
+    const journalDir = this.target?.journal.directory
+    if (!journalDir) {
+      return UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+    }
+    this.limits ??= journalPayloadLimits(journalOverflowSink(journalDir))
+    return this.limits
   }
 
   close(): void {
diff --git a/src/main/native-chat/agent-session-wire/structured-agent-session-event-sink.ts b/src/main/native-chat/agent-session-wire/structured-agent-session-event-sink.ts
index 6952b6d93e6..381218372c0 100644
--- a/src/main/native-chat/agent-session-wire/structured-agent-session-event-sink.ts
+++ b/src/main/native-chat/agent-session-wire/structured-agent-session-event-sink.ts
@@ -6,6 +6,10 @@ import type {
 import type { AgentSessionTurnActivity } from '../../../shared/agent-session-wire'
 import type { AgentSessionJournal } from '../agent-session-journal/journal-store'
 import type { JournalLifecycleMutationInput } from '../agent-session-journal/journal-row-builders'
+import {
+  UNRETAINED_JOURNAL_PAYLOAD_LIMITS,
+  type JournalPayloadLimits
+} from '../agent-session-journal/journal-payload-bounds'
 import { estimateStructuredAgentSessionItemBytes } from './structured-agent-session-event-sink-estimate'
 import { StructuredAgentSessionSinkQueue } from './structured-agent-session-event-sink-queue'
 
@@ -63,6 +67,18 @@ export type StructuredAgentSessionEventSink = {
   tryPublish?(options?: StructuredAgentSessionAppendOptions): StructuredAgentSessionSinkAdmission
   /** Couples durable-queue pressure to the exact provider stream producing it. */
   bindReadingControl?(control: StructuredAgentSessionReadingControl): () => void
+  /** Row payload budget for the bound session, which retains what it clips into
+   *  that session's overflow store. Absent on a sink with no journal behind it. */
+  payloadLimits?(): JournalPayloadLimits
+}
+
+/** The budget a translator bounds with. A sink that cannot name a journal — a
+ *  test double, or one still unbound — retains nothing, which is exactly what a
+ *  row written before overflow retention existed carried. */
+export function structuredAgentSessionPayloadLimits(
+  sink: Pick<StructuredAgentSessionEventSink, 'payloadLimits'>
+): JournalPayloadLimits {
+  return sink.payloadLimits?.() ?? UNRETAINED_JOURNAL_PAYLOAD_LIMITS
 }
 
 export type StructuredAgentSessionEventTarget = {
@@ -218,7 +234,8 @@ export function createDeferredStructuredAgentSessionEventSink(
           run: (bound) => bound.publish(activity)
         })
       },
-      tryPublish: publish
+      tryPublish: publish,
+      payloadLimits: queue.payloadLimits
     },
     bind: (next) => queue.bind(next),
     unbind: () => queue.unbind(),
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 61544fd56ab..ee9aa7da69b 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
@@ -1,6 +1,7 @@
 import { describe, expect, it } from 'vitest'
 import { projectStructuredItemToNativeChat } from '../../../shared/structured-agent-session-projection'
 import { unhandledProviderFrameJournalItem } from './unhandled-provider-frame'
+import { UNRETAINED_JOURNAL_PAYLOAD_LIMITS } from '../agent-session-journal/journal-payload-bounds'
 
 describe('unhandled provider frame journal fallback', () => {
   it('keeps a compact label and bounds the expandable payload without dropping it', () => {
@@ -8,7 +9,7 @@ describe('unhandled provider frame journal fallback', () => {
       'future-provider',
       'notification:new/event',
       { body: 'abcdefghij' },
-      { inlineHeadBytes: 8 }
+      { ...UNRETAINED_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 8 }
     )
 
     expect(item).not.toBeNull()
@@ -33,54 +34,113 @@ describe('unhandled provider frame journal fallback', () => {
     const cyclic: { warning?: unknown } = {}
     cyclic.warning = cyclic
 
-    const item = unhandledProviderFrameJournalItem('codex', 'frame', cyclic)
+    const item = unhandledProviderFrameJournalItem(
+      'codex',
+      'frame',
+      cyclic,
+      UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+    )
 
     expect(item?.body.text).toBe('codex · frame')
     expect(item?.body.providerFrame?.payload.head).toContain('unserializable payload')
   })
 
   it('routes provider lifecycle, startup, and status frames away from the timeline', () => {
-    expect(unhandledProviderFrameJournalItem('codex', 'notification:thread/started', {})).toBeNull()
     expect(
-      unhandledProviderFrameJournalItem('codex', 'notification:mcpServer/startupStatus/updated', {})
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'notification:thread/started',
+        {},
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toBeNull()
     expect(
-      unhandledProviderFrameJournalItem('codex', 'notification:remoteControl/status/changed', {})
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'notification:mcpServer/startupStatus/updated',
+        {},
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toBeNull()
     expect(
-      unhandledProviderFrameJournalItem('codex', 'notification:thread/tokenUsage/updated', {})
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'notification:remoteControl/status/changed',
+        {},
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toBeNull()
     expect(
-      unhandledProviderFrameJournalItem('codex', 'notification:thread/goal/cleared', {})
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'notification:thread/tokenUsage/updated',
+        {},
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toBeNull()
-    expect(unhandledProviderFrameJournalItem('claude', 'message:system:init', {})).toBeNull()
     expect(
-      unhandledProviderFrameJournalItem('claude', 'message:result', {
-        subtype: 'success',
-        is_error: false
-      })
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'notification:thread/goal/cleared',
+        {},
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
+    ).toBeNull()
+    expect(
+      unhandledProviderFrameJournalItem(
+        'claude',
+        'message:system:init',
+        {},
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
+    ).toBeNull()
+    expect(
+      unhandledProviderFrameJournalItem(
+        'claude',
+        'message:result',
+        {
+          subtype: 'success',
+          is_error: false
+        },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toBeNull()
   })
 
   it('never creates generic rows for delta-shaped frames that report no failure', () => {
     expect(
-      unhandledProviderFrameJournalItem('codex', 'notification:item/commandExecution/outputDelta', {
-        itemId: 'exec-1',
-        delta: 'x'
-      })
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'notification:item/commandExecution/outputDelta',
+        {
+          itemId: 'exec-1',
+          delta: 'x'
+        },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toBeNull()
     expect(
-      unhandledProviderFrameJournalItem('codex', 'notification:item/future/outputDelta', {
-        itemId: 'future-1',
-        delta: 'y'
-      })
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'notification:item/future/outputDelta',
+        {
+          itemId: 'future-1',
+          delta: 'y'
+        },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toBeNull()
   })
 
   it('surfaces an unknown delta-shaped frame whose payload reports an error', () => {
-    const row = unhandledProviderFrameJournalItem('codex', 'notification:item/future/outputDelta', {
-      error: 'stream broke mid-item'
-    })
+    const row = unhandledProviderFrameJournalItem(
+      'codex',
+      'notification:item/future/outputDelta',
+      {
+        error: 'stream broke mid-item'
+      },
+      UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+    )
 
     expect(row).not.toBeNull()
     expect(row?.classification).toBe('error-surface')
@@ -91,15 +151,25 @@ describe('unhandled provider frame journal fallback', () => {
   })
 
   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'
-    })
+    const codex = unhandledProviderFrameJournalItem(
+      'codex',
+      'notification:thread/status/changed',
+      {
+        threadId: 'thread-1',
+        status: { type: 'systemError' }
+      },
+      UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+    )
+    const claude = unhandledProviderFrameJournalItem(
+      'claude',
+      'message:result',
+      {
+        subtype: 'error_during_execution',
+        is_error: true,
+        result: 'Provider request failed'
+      },
+      UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+    )
 
     expect(codex?.body.providerFrame).toMatchObject({
       provider: 'codex',
@@ -133,20 +203,30 @@ describe('unhandled provider frame journal fallback', () => {
     const kind = 'notification:mcpServer/startupStatus/updated'
 
     expect(
-      unhandledProviderFrameJournalItem('codex', kind, {
-        name: 'filesystem',
-        status: 'starting',
-        error: null,
-        failureReason: null
-      })
+      unhandledProviderFrameJournalItem(
+        'codex',
+        kind,
+        {
+          name: 'filesystem',
+          status: 'starting',
+          error: null,
+          failureReason: null
+        },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toBeNull()
     expect(
-      unhandledProviderFrameJournalItem('codex', kind, {
-        name: 'filesystem',
-        status: 'failed',
-        error: 'server exited',
-        failureReason: null
-      })
+      unhandledProviderFrameJournalItem(
+        'codex',
+        kind,
+        {
+          name: 'filesystem',
+          status: 'failed',
+          error: 'server exited',
+          failureReason: null
+        },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).not.toBeNull()
   })
 
@@ -154,28 +234,55 @@ describe('unhandled provider frame journal fallback', () => {
     const kind = 'notification:hook/completed'
 
     expect(
-      unhandledProviderFrameJournalItem('codex', kind, {
-        run: { id: 'hook-1', status: 'completed' }
-      })
+      unhandledProviderFrameJournalItem(
+        'codex',
+        kind,
+        {
+          run: { id: 'hook-1', status: 'completed' }
+        },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toBeNull()
     expect(
-      unhandledProviderFrameJournalItem('codex', kind, {
-        run: { id: 'hook-1', status: 'failed' }
-      })
+      unhandledProviderFrameJournalItem(
+        'codex',
+        kind,
+        {
+          run: { id: 'hook-1', status: 'failed' }
+        },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).not.toBeNull()
   })
 
   it('keeps unknown substantive frames visible for both providers', () => {
     expect(
-      unhandledProviderFrameJournalItem('codex', 'notification:future/event', {})
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'notification:future/event',
+        {},
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
+    ).not.toBeNull()
+    expect(
+      unhandledProviderFrameJournalItem(
+        'claude',
+        'message:future/event',
+        {},
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).not.toBeNull()
-    expect(unhandledProviderFrameJournalItem('claude', 'message:future/event', {})).not.toBeNull()
   })
 
   it('leads with the provider sentence instead of naming the opcode', () => {
-    const row = unhandledProviderFrameJournalItem('codex', 'notification:warning', {
-      message: 'Your plan limit resets in 2 hours.'
-    })
+    const row = unhandledProviderFrameJournalItem(
+      'codex',
+      'notification:warning',
+      {
+        message: 'Your plan limit resets in 2 hours.'
+      },
+      UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+    )
     expect(row?.body.text).toBe('Your plan limit resets in 2 hours.')
     // The raw frame stays available behind the row's disclosure.
     expect(row?.body.providerFrame?.kind).toBe('notification:warning')
@@ -187,7 +294,7 @@ describe('unhandled provider frame journal fallback', () => {
       'codex',
       'notification:warning',
       { message },
-      { inlineHeadBytes: 8 }
+      { ...UNRETAINED_JOURNAL_PAYLOAD_LIMITS, inlineHeadBytes: 8 }
     )
 
     expect(row?.body.text).toContain('abcdefgh')
@@ -196,13 +303,22 @@ describe('unhandled provider frame journal fallback', () => {
 
   it('unwraps a nested sentence and falls back to the opcode when there is none', () => {
     expect(
-      unhandledProviderFrameJournalItem('codex', 'notification:warning', {
-        warning: { text: 'Sandbox is degraded.' }
-      })?.body.text
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'notification:warning',
+        {
+          warning: { text: 'Sandbox is degraded.' }
+        },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )?.body.text
     ).toBe('Sandbox is degraded.')
     expect(
-      unhandledProviderFrameJournalItem('codex', 'notification:future/event', { count: 3 })?.body
-        .text
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'notification:future/event',
+        { count: 3 },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )?.body.text
     ).toBe('codex \u00b7 notification:future/event')
   })
 })
@@ -218,7 +334,8 @@ describe('a failed provider dependency', () => {
         status: 'failed',
         error: 'MCP client for `codex_apps` failed to start: authentication token invalidated',
         failureReason: 'reauthenticationRequired'
-      }
+      },
+      UNRETAINED_JOURNAL_PAYLOAD_LIMITS
     )
     expect(item?.classification).toBe('error-surface')
     expect(item?.body.text).toContain('failed to start')
@@ -227,11 +344,16 @@ describe('a failed provider dependency', () => {
 
   it('stays out of the timeline while the dependency is merely starting', () => {
     expect(
-      unhandledProviderFrameJournalItem('codex', 'notification:mcpServer/startupStatus/updated', {
-        threadId: 'thread-1',
-        name: 'codex_apps',
-        status: 'starting'
-      })
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'notification:mcpServer/startupStatus/updated',
+        {
+          threadId: 'thread-1',
+          name: 'codex_apps',
+          status: 'starting'
+        },
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toBeNull()
   })
 })
@@ -239,12 +361,24 @@ describe('a failed provider dependency', () => {
 describe('typed notice metadata', () => {
   it('publishes readable compaction statuses for both provider forms', () => {
     expect(
-      unhandledProviderFrameJournalItem('codex', 'notification:thread/compacted', {})
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'notification:thread/compacted',
+        {},
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toMatchObject({
       classification: 'timeline-substantive',
       body: { kind: 'status', text: 'Context compacted', presentation: 'compaction' }
     })
-    expect(unhandledProviderFrameJournalItem('codex', 'item:contextCompaction', {})).toMatchObject({
+    expect(
+      unhandledProviderFrameJournalItem(
+        'codex',
+        'item:contextCompaction',
+        {},
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
+    ).toMatchObject({
       body: { kind: 'status', text: 'Context compacted', presentation: 'compaction' }
     })
   })
@@ -266,7 +400,12 @@ describe('typed notice metadata', () => {
     ['error', { error: { message: 'Connection failed' } }, 'error', 'Connection failed']
   ])('assigns the tone and readable text for %s', (method, payload, tone, text) => {
     expect(
-      unhandledProviderFrameJournalItem('codex', `notification:${method}`, payload)
+      unhandledProviderFrameJournalItem(
+        'codex',
+        `notification:${method}`,
+        payload,
+        UNRETAINED_JOURNAL_PAYLOAD_LIMITS
+      )
     ).toMatchObject({
       classification: 'error-surface',
       body: { kind: 'status', text, tone }
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 272e960b838..1b240d1355c 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
@@ -2,7 +2,6 @@ import type { AgentJournalStatusItem } from '../../../shared/agent-session-journ
 import {
   boundInlineText,
   boundPayload,
-  DEFAULT_JOURNAL_PAYLOAD_LIMITS,
   type JournalPayloadLimits
 } from '../agent-session-journal/journal-payload-bounds'
 import { classifyProviderFrame } from './provider-frame-disposition'
@@ -75,7 +74,7 @@ export function unhandledProviderFrameJournalItem(
   provider: string,
   kind: string,
   payload: unknown,
-  limits: JournalPayloadLimits = DEFAULT_JOURNAL_PAYLOAD_LIMITS
+  limits: JournalPayloadLimits
 ): UnhandledProviderFrameJournalItem | null {
   const classification = classifyProviderFrame(provider, kind, payload)
   if (
diff --git a/src/shared/agent-session-journal-schemas.ts b/src/shared/agent-session-journal-schemas.ts
index 89c2d9f7293..a80f8112c9f 100644
--- a/src/shared/agent-session-journal-schemas.ts
+++ b/src/shared/agent-session-journal-schemas.ts
@@ -25,7 +25,8 @@ const BoundedPayload = z.object({
   head: z.string(),
   byteLength: z.number(),
   digest: z.string(),
-  truncated: z.boolean()
+  truncated: z.boolean(),
+  spilled: z.literal(true).optional()
 })
 
 const ProviderFrame = z.object({
diff --git a/src/shared/agent-session-journal-types.ts b/src/shared/agent-session-journal-types.ts
index c0074e015f5..1c5cad61996 100644
--- a/src/shared/agent-session-journal-types.ts
+++ b/src/shared/agent-session-journal-types.ts
@@ -59,17 +59,22 @@ export type AgentJournalItemIdentity =
 
 // ─── Bounded payloads ───────────────────────────────────────────────────────
 
-/** A tool output or diff body clipped to a head. The remainder is DISCARDED,
- *  never stored: crossing a bound sets `truncated` and the two fields below
- *  describe what was dropped, so it is marked rather than silently lost. */
+/** A tool output or diff body clipped to a head. `truncated` marks the clip and
+ *  the two fields below describe the original, so a bounded body is never a
+ *  silently short one. */
 export type AgentJournalBoundedPayload = {
   head: string
   /** Byte length of the ORIGINAL payload, not of `head`. */
   byteLength: number
-  /** sha256 of the original payload — identification only; nothing stores or
-   *  retrieves the discarded remainder by it. */
+  /** sha256 of the original payload. Also the key the full bytes are retained
+   *  under on the execution host when `spilled` is set. */
   digest: string
   truncated: boolean
+  /** The full payload was retained on the execution host under `digest` before
+   *  the clip. Absent on a row written by a build that could not retain it, and
+   *  on one whose retention failed — those still carry head, length and digest.
+   *  Additive: an older client ignores it and renders the head as it always did. */
+  spilled?: true
 }
 
 // ─── Render-model items ─────────────────────────────────────────────────────
diff --git a/src/shared/native-chat-types.ts b/src/shared/native-chat-types.ts
index 3a018d75e6b..3848523b4c1 100644
--- a/src/shared/native-chat-types.ts
+++ b/src/shared/native-chat-types.ts
@@ -44,6 +44,7 @@ export type NativeChatTextBlock = {
       byteLength: number
       digest: string
       truncated: boolean
+      spilled?: true
     }
   }
 }