diff --git a/ui-tui/packages/hermes-ink/src/ink/components/AlternateScreen.tsx b/ui-tui/packages/hermes-ink/src/ink/components/AlternateScreen.tsx
index f5fb660bed..6bf9f513aa 100644
--- a/ui-tui/packages/hermes-ink/src/ink/components/AlternateScreen.tsx
+++ b/ui-tui/packages/hermes-ink/src/ink/components/AlternateScreen.tsx
@@ -53,7 +53,11 @@ export function AlternateScreen(t0: Props) {
       }
 
       writeRaw(
-        ENTER_ALT_SCREEN + ERASE_SCROLLBACK + ERASE_SCREEN + CURSOR_HOME + (mouseTracking ? ENABLE_MOUSE_TRACKING : DISABLE_MOUSE_TRACKING)
+        ENTER_ALT_SCREEN +
+          ERASE_SCROLLBACK +
+          ERASE_SCREEN +
+          CURSOR_HOME +
+          (mouseTracking ? ENABLE_MOUSE_TRACKING : DISABLE_MOUSE_TRACKING)
       )
       ink?.setAltScreenActive(true, mouseTracking)
 
diff --git a/ui-tui/packages/hermes-ink/src/ink/dom.ts b/ui-tui/packages/hermes-ink/src/ink/dom.ts
index 9ff1be4119..1a1ad4af49 100644
--- a/ui-tui/packages/hermes-ink/src/ink/dom.ts
+++ b/ui-tui/packages/hermes-ink/src/ink/dom.ts
@@ -323,27 +323,38 @@ const measureTextNode = function (
   widthMode: LayoutMeasureMode
 ): { width: number; height: number } {
   const elem = node.nodeName !== '#text' ? (node as DOMElement) : node.parentNode
+
   if (elem && elem.nodeName === 'ink-text') {
     let cache = elem._textMeasureCache
+
     if (!cache) {
       cache = { gen: 0, entries: new Map() }
       elem._textMeasureCache = cache
     }
+
     const key = `${width}|${widthMode}`
     const hit = cache.entries.get(key)
+
     if (hit && hit._gen === cache.gen) {
       return hit.result
     }
+
     const result = computeTextMeasure(node, width, widthMode)
+
     // Enforce cap with FIFO eviction to avoid unbounded growth during
     // pathological frames where yoga probes many widths.
     if (cache.entries.size >= MEASURE_CACHE_CAP) {
       const firstKey = cache.entries.keys().next().value
-      cache.entries.delete(firstKey)
+      if (firstKey !== undefined) {
+        cache.entries.delete(firstKey)
+      }
     }
+
     cache.entries.set(key, { _gen: cache.gen, result })
+
     return result
   }
+
   return computeTextMeasure(node, width, widthMode)
 }
 
@@ -475,6 +486,7 @@ export const clearYogaNodeReferences = (node: DOMElement | TextNode): void => {
     for (const child of node.childNodes) {
       clearYogaNodeReferences(child)
     }
+
     node._textMeasureCache = undefined
   }
 
diff --git a/ui-tui/packages/hermes-ink/src/ink/termio/osc.test.ts b/ui-tui/packages/hermes-ink/src/ink/termio/osc.test.ts
index 02ea9ebd2c..4860544479 100644
--- a/ui-tui/packages/hermes-ink/src/ink/termio/osc.test.ts
+++ b/ui-tui/packages/hermes-ink/src/ink/termio/osc.test.ts
@@ -9,18 +9,21 @@ describe('shouldEmitClipboardSequence', () => {
   })
 
   it('keeps OSC enabled for remote or plain local terminals', () => {
-    expect(shouldEmitClipboardSequence({ SSH_CONNECTION: '1', TMUX: '/tmp/tmux-1/default,1,0' } as NodeJS.ProcessEnv)).toBe(
-      true
-    )
+    expect(
+      shouldEmitClipboardSequence({ SSH_CONNECTION: '1', TMUX: '/tmp/tmux-1/default,1,0' } as NodeJS.ProcessEnv)
+    ).toBe(true)
     expect(shouldEmitClipboardSequence({ TERM: 'xterm-256color' } as NodeJS.ProcessEnv)).toBe(true)
   })
 
   it('honors explicit env override', () => {
-    expect(shouldEmitClipboardSequence({ HERMES_TUI_CLIPBOARD_OSC52: '1', TMUX: '/tmp/tmux-1/default,1,0' } as NodeJS.ProcessEnv)).toBe(
-      true
-    )
-    expect(shouldEmitClipboardSequence({ HERMES_TUI_COPY_OSC52: '0', TERM: 'xterm-256color' } as NodeJS.ProcessEnv)).toBe(
-      false
-    )
+    expect(
+      shouldEmitClipboardSequence({
+        HERMES_TUI_CLIPBOARD_OSC52: '1',
+        TMUX: '/tmp/tmux-1/default,1,0'
+      } as NodeJS.ProcessEnv)
+    ).toBe(true)
+    expect(
+      shouldEmitClipboardSequence({ HERMES_TUI_COPY_OSC52: '0', TERM: 'xterm-256color' } as NodeJS.ProcessEnv)
+    ).toBe(false)
   })
 })
diff --git a/ui-tui/src/__tests__/createGatewayEventHandler.test.ts b/ui-tui/src/__tests__/createGatewayEventHandler.test.ts
index f8d88a50f6..991c87a1c6 100644
--- a/ui-tui/src/__tests__/createGatewayEventHandler.test.ts
+++ b/ui-tui/src/__tests__/createGatewayEventHandler.test.ts
@@ -226,7 +226,10 @@ describe('createGatewayEventHandler', () => {
     const inlineDiff = '--- a/foo.ts\n+++ b/foo.ts\n@@\n-old\n+new'
     const assistantText = 'Done. Clean swap:\n\n```diff\n-old\n+new\n```'
 
-    onEvent({ payload: { inline_diff: inlineDiff, summary: 'patched', tool_id: 'tool-1' }, type: 'tool.complete' } as any)
+    onEvent({
+      payload: { inline_diff: inlineDiff, summary: 'patched', tool_id: 'tool-1' },
+      type: 'tool.complete'
+    } as any)
     onEvent({ payload: { text: assistantText }, type: 'message.complete' } as any)
 
     expect(appended).toHaveLength(1)
diff --git a/ui-tui/src/__tests__/createSlashHandler.test.ts b/ui-tui/src/__tests__/createSlashHandler.test.ts
index 9a255f704c..3df9f2818c 100644
--- a/ui-tui/src/__tests__/createSlashHandler.test.ts
+++ b/ui-tui/src/__tests__/createSlashHandler.test.ts
@@ -126,9 +126,7 @@ describe('createSlashHandler', () => {
     const ctx = buildCtx()
     createSlashHandler(ctx)('/details tools blink')
     expect(getUiState().sections.tools).toBeUndefined()
-    expect(ctx.transcript.sys).toHaveBeenCalledWith(
-      'usage: /details <section> [hidden|collapsed|expanded|reset]'
-    )
+    expect(ctx.transcript.sys).toHaveBeenCalledWith('usage: /details <section> [hidden|collapsed|expanded|reset]')
   })
 
   it('shows tool enable usage when names are missing', () => {
diff --git a/ui-tui/src/__tests__/details.test.ts b/ui-tui/src/__tests__/details.test.ts
index 15ef681dc2..0f567b2f72 100644
--- a/ui-tui/src/__tests__/details.test.ts
+++ b/ui-tui/src/__tests__/details.test.ts
@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest'
 
-import { isSectionName, parseDetailsMode, resolveSections, sectionMode, SECTION_NAMES } from '../domain/details.js'
+import { isSectionName, parseDetailsMode, resolveSections, SECTION_NAMES, sectionMode } from '../domain/details.js'
 
 describe('parseDetailsMode', () => {
   it('accepts the canonical modes case-insensitively', () => {
diff --git a/ui-tui/src/app.tsx b/ui-tui/src/app.tsx
index 522e982958..5fc0ba9888 100644
--- a/ui-tui/src/app.tsx
+++ b/ui-tui/src/app.tsx
@@ -1,8 +1,8 @@
 import { useStore } from '@nanostores/react'
 
 import { GatewayProvider } from './app/gatewayContext.js'
-import { useMainApp } from './app/useMainApp.js'
 import { $uiState } from './app/uiStore.js'
+import { useMainApp } from './app/useMainApp.js'
 import { AppLayout } from './components/appLayout.js'
 import type { GatewayClient } from './gatewayClient.js'
 
diff --git a/ui-tui/src/app/slash/commands/core.ts b/ui-tui/src/app/slash/commands/core.ts
index a252d8d453..518eb668a5 100644
--- a/ui-tui/src/app/slash/commands/core.ts
+++ b/ui-tui/src/app/slash/commands/core.ts
@@ -1,7 +1,7 @@
 import { NO_CONFIRM_DESTRUCTIVE } from '../../../config/env.js'
 import { dailyFortune, randomFortune } from '../../../content/fortunes.js'
 import { HOTKEYS } from '../../../content/hotkeys.js'
-import { SECTION_NAMES, isSectionName, nextDetailsMode, parseDetailsMode } from '../../../domain/details.js'
+import { isSectionName, nextDetailsMode, parseDetailsMode, SECTION_NAMES } from '../../../domain/details.js'
 import type {
   ConfigGetValueResponse,
   ConfigSetResponse,
@@ -40,8 +40,10 @@ const flagFromArg = (arg: string, current: boolean): boolean | null => {
 
 const RESET_WORDS = new Set(['reset', 'clear', 'default'])
 const CYCLE_WORDS = new Set(['cycle', 'toggle'])
+
 const DETAILS_USAGE =
   'usage: /details [hidden|collapsed|expanded|cycle]  or  /details <section> [hidden|collapsed|expanded|reset]'
+
 const DETAILS_SECTION_USAGE = 'usage: /details <section> [hidden|collapsed|expanded|reset]'
 
 export const coreCommands: SlashCommand[] = [
@@ -97,9 +99,7 @@ export const coreCommands: SlashCommand[] = [
       }
 
       patchUiState({ mouseTracking: next })
-      ctx.gateway
-        .rpc<ConfigSetResponse>('config.set', { key: 'mouse', value: next ? 'on' : 'off' })
-        .catch(() => {})
+      ctx.gateway.rpc<ConfigSetResponse>('config.set', { key: 'mouse', value: next ? 'on' : 'off' }).catch(() => {})
 
       queueMicrotask(() => ctx.transcript.sys(`mouse tracking ${next ? 'on' : 'off'}`))
     }
@@ -178,7 +178,9 @@ export const coreCommands: SlashCommand[] = [
         gateway
           .rpc<ConfigGetValueResponse>('config.get', { key: 'details_mode' })
           .then(r => {
-            if (ctx.stale()) return
+            if (ctx.stale()) {
+              return
+            }
 
             const mode = parseDetailsMode(r?.value) ?? ui.detailsMode
             patchUiState({ detailsMode: mode })
diff --git a/ui-tui/src/app/turnController.ts b/ui-tui/src/app/turnController.ts
index f45cab241c..1041b4d4f5 100644
--- a/ui-tui/src/app/turnController.ts
+++ b/ui-tui/src/app/turnController.ts
@@ -300,6 +300,7 @@ class TurnController {
 
     const hasDiffSegment = segments.some(msg => msg.kind === 'diff')
     const detailsBelongBeforeDiff = hasDiffSegment && (tools.length > 0 || Boolean(savedReasoning))
+
     const finalMessages = detailsBelongBeforeDiff
       ? insertBeforeFirstDiff(segments, {
           kind: 'trail',
diff --git a/ui-tui/src/app/uiStore.ts b/ui-tui/src/app/uiStore.ts
index 260b26ab5a..fc17a6948f 100644
--- a/ui-tui/src/app/uiStore.ts
+++ b/ui-tui/src/app/uiStore.ts
@@ -1,8 +1,8 @@
 import { atom } from 'nanostores'
 
+import { MOUSE_TRACKING } from '../config/env.js'
 import { ZERO } from '../domain/usage.js'
 import { DEFAULT_THEME } from '../theme.js'
-import { MOUSE_TRACKING } from '../config/env.js'
 
 import type { UiState } from './interfaces.js'
 
diff --git a/ui-tui/src/app/useInputHandlers.ts b/ui-tui/src/app/useInputHandlers.ts
index 47fe8a2166..294a44ca6f 100644
--- a/ui-tui/src/app/useInputHandlers.ts
+++ b/ui-tui/src/app/useInputHandlers.ts
@@ -159,16 +159,14 @@ export function useInputHandlers(ctx: InputHandlerContext): InputHandlerResult {
       voice.setProcessing(false)
     }
 
-    gateway
-      .rpc<VoiceRecordResponse>('voice.record', { action })
-      .catch((e: Error) => {
-        // Revert optimistic UI on failure.
-        if (starting) {
-          voice.setRecording(false)
-        }
+    gateway.rpc<VoiceRecordResponse>('voice.record', { action }).catch((e: Error) => {
+      // Revert optimistic UI on failure.
+      if (starting) {
+        voice.setRecording(false)
+      }
 
-        actions.sys(`voice error: ${e.message}`)
-      })
+      actions.sys(`voice error: ${e.message}`)
+    })
   }
 
   useInput((ch, key) => {
diff --git a/ui-tui/src/app/useMainApp.ts b/ui-tui/src/app/useMainApp.ts
index d2e5494a95..0230e0b1fd 100644
--- a/ui-tui/src/app/useMainApp.ts
+++ b/ui-tui/src/app/useMainApp.ts
@@ -640,14 +640,14 @@ export function useMainApp(gw: GatewayClient) {
   const showProgressArea = anyPanelVisible
     ? Boolean(
         ui.busy ||
-          turn.outcome ||
-          turn.streamPendingTools.length ||
-          turn.streamSegments.length ||
-          turn.subagents.length ||
-          turn.tools.length ||
-          turn.turnTrail.length ||
-          hasReasoning ||
-          turn.activity.length
+        turn.outcome ||
+        turn.streamPendingTools.length ||
+        turn.streamSegments.length ||
+        turn.subagents.length ||
+        turn.tools.length ||
+        turn.turnTrail.length ||
+        hasReasoning ||
+        turn.activity.length
       )
     : turn.activity.some(item => item.tone !== 'info')
 
diff --git a/ui-tui/src/components/appChrome.tsx b/ui-tui/src/components/appChrome.tsx
index 7b697eedce..001c89b91f 100644
--- a/ui-tui/src/components/appChrome.tsx
+++ b/ui-tui/src/components/appChrome.tsx
@@ -218,11 +218,7 @@ export function StatusRule({
           {voiceLabel ? (
             <Text
               color={
-                voiceLabel.startsWith('●')
-                  ? t.color.error
-                  : voiceLabel.startsWith('◉')
-                    ? t.color.warn
-                    : t.color.dim
+                voiceLabel.startsWith('●') ? t.color.error : voiceLabel.startsWith('◉') ? t.color.warn : t.color.dim
               }
             >
               {' │ '}
diff --git a/ui-tui/src/components/messageLine.tsx b/ui-tui/src/components/messageLine.tsx
index 3fc40528a3..fc6f78e924 100644
--- a/ui-tui/src/components/messageLine.tsx
+++ b/ui-tui/src/components/messageLine.tsx
@@ -1,8 +1,8 @@
 import { Ansi, Box, NoSelect, Text } from '@hermes/ink'
 import { memo } from 'react'
 
-import { sectionMode } from '../domain/details.js'
 import { LONG_MSG } from '../config/limits.js'
+import { sectionMode } from '../domain/details.js'
 import { userDisplay } from '../domain/messages.js'
 import { ROLE } from '../domain/roles.js'
 import { compactPreview, hasAnsi, isPasteBackedText, stripAnsi } from '../lib/text.js'
@@ -72,8 +72,7 @@ export const MessageLine = memo(function MessageLine({
   const { body, glyph, prefix } = ROLE[msg.role](t)
 
   const showDetails =
-    (toolsMode !== 'hidden' && Boolean(msg.tools?.length)) ||
-    (thinkingMode !== 'hidden' && Boolean(thinking))
+    (toolsMode !== 'hidden' && Boolean(msg.tools?.length)) || (thinkingMode !== 'hidden' && Boolean(thinking))
 
   const content = (() => {
     if (msg.kind === 'slash') {
diff --git a/ui-tui/src/components/thinking.tsx b/ui-tui/src/components/thinking.tsx
index e2cfc47663..2d52102b51 100644
--- a/ui-tui/src/components/thinking.tsx
+++ b/ui-tui/src/components/thinking.tsx
@@ -1,5 +1,5 @@
 import { Box, NoSelect, Text } from '@hermes/ink'
-import { memo, useEffect, useMemo, useState, type ReactNode } from 'react'
+import { memo, type ReactNode, useEffect, useMemo, useState } from 'react'
 import spinners, { type BrailleSpinnerName } from 'unicode-animations'
 
 import { THINKING_COT_MAX } from '../config/limits.js'
@@ -919,13 +919,22 @@ export const ToolTrail = memo(function ToolTrail({
   // hidden sections stay hidden so the override is honoured.
 
   const expandAll = () => {
-    if (visible.thinking !== 'hidden') setOpenThinking(true)
-    if (visible.tools !== 'hidden') setOpenTools(true)
+    if (visible.thinking !== 'hidden') {
+      setOpenThinking(true)
+    }
+
+    if (visible.tools !== 'hidden') {
+      setOpenTools(true)
+    }
+
     if (visible.subagents !== 'hidden') {
       setOpenSubagents(true)
       setDeepSubagents(true)
     }
-    if (visible.activity !== 'hidden') setOpenMeta(true)
+
+    if (visible.activity !== 'hidden') {
+      setOpenMeta(true)
+    }
   }
 
   const metaTone: 'dim' | 'error' | 'warn' = activity.some(i => i.tone === 'error')
diff --git a/ui-tui/src/lib/platform.ts b/ui-tui/src/lib/platform.ts
index 9e85da16f8..6913df4bc8 100644
--- a/ui-tui/src/lib/platform.ts
+++ b/ui-tui/src/lib/platform.ts
@@ -43,7 +43,5 @@ export const isAction = (key: { ctrl: boolean; meta: boolean; super?: boolean },
  * accept Cmd+B (the platform action modifier) so existing macOS muscle memory
  * keeps working.
  */
-export const isVoiceToggleKey = (
-  key: { ctrl: boolean; meta: boolean; super?: boolean },
-  ch: string
-): boolean => (key.ctrl || isActionMod(key)) && ch.toLowerCase() === 'b'
+export const isVoiceToggleKey = (key: { ctrl: boolean; meta: boolean; super?: boolean }, ch: string): boolean =>
+  (key.ctrl || isActionMod(key)) && ch.toLowerCase() === 'b'