diff --git a/tui_gateway/server.py b/tui_gateway/server.py
index 462a774ea41..2a1456e41be 100644
--- a/tui_gateway/server.py
+++ b/tui_gateway/server.py
@@ -3134,27 +3134,6 @@ def _(rid, params: dict) -> dict:
         _write_config_key("display.tui_mouse", nv)
         return _ok(rid, {"key": key, "value": "on" if nv else "off"})
 
-    if key == "copy_on_select":
-        raw = str(value or "").strip().lower()
-        display = (
-            _load_cfg().get("display")
-            if isinstance(_load_cfg().get("display"), dict)
-            else {}
-        )
-        current = bool(display.get("tui_copy_on_select", True))
-
-        if raw in ("", "toggle"):
-            nv = not current
-        elif raw == "on":
-            nv = True
-        elif raw == "off":
-            nv = False
-        else:
-            return _err(rid, 4002, f"unknown copy_on_select value: {value}")
-
-        _write_config_key("display.tui_copy_on_select", nv)
-        return _ok(rid, {"key": key, "value": "on" if nv else "off"})
-
     if key in ("prompt", "personality", "skin"):
         try:
             cfg = _load_cfg()
@@ -3302,14 +3281,6 @@ def _(rid, params: dict) -> dict:
         display = _load_cfg().get("display")
         on = display.get("tui_mouse", True) if isinstance(display, dict) else True
         return _ok(rid, {"value": "on" if on else "off"})
-    if key == "copy_on_select":
-        display = _load_cfg().get("display")
-        on = (
-            display.get("tui_copy_on_select", True)
-            if isinstance(display, dict)
-            else True
-        )
-        return _ok(rid, {"value": "on" if on else "off"})
     if key == "mtime":
         cfg_path = _hermes_home / "config.yaml"
         try:
diff --git a/ui-tui/src/app/interfaces.ts b/ui-tui/src/app/interfaces.ts
index 27fca574c0b..1d7cdaead03 100644
--- a/ui-tui/src/app/interfaces.ts
+++ b/ui-tui/src/app/interfaces.ts
@@ -86,7 +86,6 @@ export interface UiState {
   bgTasks: Set<string>
   busy: boolean
   compact: boolean
-  copyOnSelect: boolean
   detailsMode: DetailsMode
   detailsModeCommandOverride: boolean
   info: null | SessionInfo
diff --git a/ui-tui/src/app/slash/commands/core.ts b/ui-tui/src/app/slash/commands/core.ts
index 0461b2f92dc..2cad70b9a5d 100644
--- a/ui-tui/src/app/slash/commands/core.ts
+++ b/ui-tui/src/app/slash/commands/core.ts
@@ -107,27 +107,6 @@ export const coreCommands: SlashCommand[] = [
     }
   },
 
-  {
-    aliases: ['cos'],
-    help: 'toggle auto copy-on-drag-release [on|off|toggle]',
-    name: 'copyselect',
-    run: (arg, ctx) => {
-      const current = ctx.ui.copyOnSelect
-      const next = flagFromArg(arg, current)
-
-      if (next === null) {
-        return ctx.transcript.sys('usage: /copyselect [on|off|toggle]')
-      }
-
-      patchUiState({ copyOnSelect: next })
-      ctx.gateway
-        .rpc<ConfigSetResponse>('config.set', { key: 'copy_on_select', value: next ? 'on' : 'off' })
-        .catch(() => {})
-
-      queueMicrotask(() => ctx.transcript.sys(`copy-on-select ${next ? 'on' : 'off'}`))
-    }
-  },
-
   {
     aliases: ['new'],
     help: 'start a new session',
diff --git a/ui-tui/src/app/uiStore.ts b/ui-tui/src/app/uiStore.ts
index ad7a01fd33a..1b3a841e18c 100644
--- a/ui-tui/src/app/uiStore.ts
+++ b/ui-tui/src/app/uiStore.ts
@@ -1,6 +1,6 @@
 import { atom } from 'nanostores'
 
-import { COPY_ON_SELECT, MOUSE_TRACKING } from '../config/env.js'
+import { MOUSE_TRACKING } from '../config/env.js'
 import { ZERO } from '../domain/usage.js'
 import { DEFAULT_THEME } from '../theme.js'
 
@@ -10,7 +10,6 @@ const buildUiState = (): UiState => ({
   bgTasks: new Set(),
   busy: false,
   compact: false,
-  copyOnSelect: COPY_ON_SELECT,
   detailsMode: 'collapsed',
   detailsModeCommandOverride: false,
   info: null,
diff --git a/ui-tui/src/app/useConfigSync.ts b/ui-tui/src/app/useConfigSync.ts
index 8e89e02ab8f..26d02d62046 100644
--- a/ui-tui/src/app/useConfigSync.ts
+++ b/ui-tui/src/app/useConfigSync.ts
@@ -44,7 +44,6 @@ export const applyDisplay = (cfg: ConfigFullResponse | null, setBell: (v: boolea
   setBell(!!d.bell_on_complete)
   patchUiState({
     compact: !!d.tui_compact,
-    copyOnSelect: d.tui_copy_on_select !== false,
     detailsMode: resolveDetailsMode(d),
     detailsModeCommandOverride: false,
     inlineDiffs: d.inline_diffs !== false,
diff --git a/ui-tui/src/app/useMainApp.ts b/ui-tui/src/app/useMainApp.ts
index cc258892e89..9f2cae78d64 100644
--- a/ui-tui/src/app/useMainApp.ts
+++ b/ui-tui/src/app/useMainApp.ts
@@ -142,73 +142,11 @@ export function useMainApp(gw: GatewayClient) {
 
   const hasSelection = useHasSelection()
   const selection = useSelection()
-  const copyOnSelect = ui.copyOnSelect
 
   useEffect(() => {
     selection.setSelectionBgColor(ui.theme.color.selectionBg)
   }, [selection, ui.theme.color.selectionBg])
 
-  // Auto copy-on-select: when a drag completes with a real selection
-  // (anchor + focus, not a bare click), push the text to the clipboard
-  // without clearing the highlight. Matches iTerm2's "Copy to pasteboard
-  // on selection" — drag → release → already on clipboard, paste anywhere.
-  // Subscribes once and tracks the previous isDragging on a ref so the
-  // effect doesn't re-attach on every selection tick.
-  const wasDraggingRef = useRef(false)
-  const lastCopiedRef = useRef<{ anchor: string; focus: string } | null>(null)
-
-  useEffect(() => {
-    if (!copyOnSelect) {
-      wasDraggingRef.current = false
-
-      return
-    }
-
-    const fingerprint = (s: { anchor: { col: number; row: number } | null; focus: { col: number; row: number } | null }) => ({
-      anchor: s.anchor ? `${s.anchor.row}:${s.anchor.col}` : '',
-      focus: s.focus ? `${s.focus.row}:${s.focus.col}` : ''
-    })
-
-    return selection.subscribe(() => {
-      const state = selection.getState()
-
-      if (!state) {
-        return
-      }
-
-      const dragging = state.isDragging
-      const prev = wasDraggingRef.current
-      wasDraggingRef.current = dragging
-
-      if (!state.anchor) {
-        lastCopiedRef.current = null
-
-        return
-      }
-
-      if (!prev || dragging || !state.focus) {
-        return
-      }
-
-      const fp = fingerprint(state)
-      const last = lastCopiedRef.current
-
-      if (last && last.anchor === fp.anchor && last.focus === fp.focus) {
-        return
-      }
-
-      lastCopiedRef.current = fp
-
-      void selection.copySelectionNoClear().then(text => {
-        if (text) {
-          const len = text.length
-
-          turnController.pushActivity(`copied ${len} char${len === 1 ? '' : 's'} · Esc to clear`, 'info')
-        }
-      })
-    })
-  }, [copyOnSelect, selection])
-
   const composer = useComposerState({
     gw,
     onClipboardPaste: quiet => clipboardPasteRef.current(quiet),
diff --git a/ui-tui/src/config/env.ts b/ui-tui/src/config/env.ts
index f3616541b46..8fb9cf69a6e 100644
--- a/ui-tui/src/config/env.ts
+++ b/ui-tui/src/config/env.ts
@@ -2,9 +2,6 @@ const truthy = (v?: string) => /^(?:1|true|yes|on)$/i.test((v ?? '').trim())
 
 export const STARTUP_RESUME_ID = (process.env.HERMES_TUI_RESUME ?? '').trim()
 export const MOUSE_TRACKING = !truthy(process.env.HERMES_TUI_DISABLE_MOUSE)
-// Drag-release auto-copies the selected text. Off by default for terminals
-// that do clipboard their own way; opt out with the env var or /copyselect.
-export const COPY_ON_SELECT = !truthy(process.env.HERMES_TUI_DISABLE_COPY_ON_SELECT)
 export const NO_CONFIRM_DESTRUCTIVE = truthy(process.env.HERMES_TUI_NO_CONFIRM)
 
 // Skip AlternateScreen — TUI renders into the primary buffer so the host
diff --git a/ui-tui/src/content/hotkeys.ts b/ui-tui/src/content/hotkeys.ts
index bc3cb6406d5..b79d08061bf 100644
--- a/ui-tui/src/content/hotkeys.ts
+++ b/ui-tui/src/content/hotkeys.ts
@@ -16,11 +16,7 @@ const copyHotkeys: [string, string][] = isMac
     : [['Ctrl+C', 'copy selection / interrupt / clear draft / exit']]
 
 export const HOTKEYS: [string, string][] = [
-  ['drag', 'select text in transcript (auto-copies on release)'],
-  ['double / triple click', 'select word / line'],
-  ['click input', 'position cursor inside the prompt'],
   ...copyHotkeys,
-  ['Esc', 'clear selection'],
   [action + '+D', 'exit'],
   [action + '+G / Alt+G', 'open $EDITOR (Alt+G fallback for VSCode/Cursor)'],
   [action + '+L', 'redraw / repaint'],
diff --git a/ui-tui/src/gatewayTypes.ts b/ui-tui/src/gatewayTypes.ts
index 96760a77f38..605d51213f7 100644
--- a/ui-tui/src/gatewayTypes.ts
+++ b/ui-tui/src/gatewayTypes.ts
@@ -61,7 +61,6 @@ export interface ConfigDisplayConfig {
   streaming?: boolean
   thinking_mode?: string
   tui_compact?: boolean
-  tui_copy_on_select?: boolean
   tui_mouse?: boolean
   tui_statusbar?: 'bottom' | 'off' | 'on' | 'top' | boolean
 }
diff --git a/ui-tui/src/types/hermes-ink.d.ts b/ui-tui/src/types/hermes-ink.d.ts
index 4d79544eb7a..5c3d85697d3 100644
--- a/ui-tui/src/types/hermes-ink.d.ts
+++ b/ui-tui/src/types/hermes-ink.d.ts
@@ -139,17 +139,12 @@ declare module '@hermes/ink' {
   export function useExternalProcess(): (run: RunExternalProcess) => Promise<void>
   export function withInkSuspended(run: RunExternalProcess): Promise<void>
   export function useInput(handler: InputHandler, options?: { readonly isActive?: boolean }): void
-  export type InkSelectionState = {
-    readonly anchor: { readonly col: number; readonly row: number } | null
-    readonly focus: { readonly col: number; readonly row: number } | null
-    readonly isDragging: boolean
-  }
   export function useSelection(): {
     readonly copySelection: () => Promise<string>
     readonly copySelectionNoClear: () => Promise<string>
     readonly clearSelection: () => void
     readonly hasSelection: () => boolean
-    readonly getState: () => InkSelectionState | null
+    readonly getState: () => unknown
     readonly subscribe: (cb: () => void) => () => void
     readonly shiftAnchor: (dRow: number, minRow: number, maxRow: number) => void
     readonly shiftSelection: (dRow: number, minRow: number, maxRow: number) => void