opentui(v5/item1): resumed tools render like live (collapsible + output)

Resumed tool calls were flat `⚡name arg` rows — no output, not collapsible —
because the resume snapshot (_history_to_messages) dropped each tool's result.
Now the native engine passes `with_tool_output: true` on session.resume and the
gateway folds the tool's redacted+capped result + args into its row, so resumed
turns show `▶ name arg (N lines)` collapsible blocks identical to a live turn.

The flag is OPT-IN: Ink doesn't pass it, so _history_to_messages stays byte-for-
byte unchanged for the Ink path (its expanded verbose-trail render OOM'd on big
output, #34095; the native engine renders tools collapsed, so the capped tail is
safe there). resume.ts maps context→argsPreview, result_text→resultText (label
peeled + envelope stripped), args→argsText — same shape as the live tool part.

py_compile OK. resume tests updated + 1 added (79 pass).

tui_gateway/server.py

@@ -2931,7 +2931,13 @@ def _coerce_message_text(content: Any) -> str:
     return str(content)
 
 
-def _history_to_messages(history: list[dict]) -> list[dict]:
+def _history_to_messages(history: list[dict], include_tool_output: bool = False) -> list[dict]:
+    # ``include_tool_output`` (opt-in; only the native/opentui engine passes it via
+    # session.resume) folds each tool's redacted+capped result + args into its row so
+    # a resumed transcript renders collapsible tool blocks identical to a live turn.
+    # OFF by default so the Ink path is byte-for-byte unchanged (its render tree showed
+    # the verbose trail expanded and OOM'd on big output — #34095; the native engine
+    # renders tools collapsed, so shipping the same capped tail is safe there).
     messages = []
     tool_call_args = {}
 
@@ -2959,9 +2965,13 @@ def _history_to_messages(history: list[dict]) -> list[dict]:
             tc_info = tool_call_args.get(tc_id) if tc_id else None
             name = (tc_info[0] if tc_info else None) or m.get("tool_name") or "tool"
             args = (tc_info[1] if tc_info else None) or {}
-            messages.append(
-                {"role": "tool", "name": name, "context": _tool_ctx(name, args)}
-            )
+            tool_msg = {"role": "tool", "name": name, "context": _tool_ctx(name, args)}
+            if include_tool_output:
+                if args:
+                    tool_msg["args"] = args
+                if content_text.strip():
+                    tool_msg["result_text"] = _redact_tui_verbose_text(content_text)
+            messages.append(tool_msg)
             continue
         if not content_text.strip():
             continue
@@ -3338,7 +3348,9 @@ def _(rid, params: dict) -> dict:
         display_history_prefix = display_history[
             : max(0, len(display_history) - len(history))
         ]
-        messages = _history_to_messages(display_history)
+        messages = _history_to_messages(
+            display_history, include_tool_output=bool(params.get("with_tool_output"))
+        )
         tokens = _set_session_context(target)
         try:
             # Pass the profile's db so the agent persists turns to the right

ui-tui-opentui-v2/src/entry/main.tsx

@@ -66,7 +66,10 @@ const resumeInto = (gateway: GatewayServiceShape, store: SessionStore, sid: stri
     const t0 = Date.now()
     const resumed = yield* gateway.request<{ messages?: unknown; info?: Record<string, unknown> }>('session.resume', {
       cols,
-      session_id: sid
+      session_id: sid,
+      // native engine renders tools collapsed → safe to fold each tool's capped
+      // result into the resume snapshot so resumed turns render like live (item 1).
+      with_tool_output: true
     })
     const t1 = Date.now()
     const snapshot = mapResumeHistory(resumed?.messages)

ui-tui-opentui-v2/src/logic/resume.ts

@@ -9,7 +9,8 @@
  * a live one. Resumed assistant text is given a single text part so it renders
  * through the native markdown path. IDs are `r*` (distinct from live `p*`).
  */
-import type { Message, Part, SessionItem } from './store.ts'
+import type { Message, Part, SessionItem, ToolPartState } from './store.ts'
+import { stripOmittedNote, stripToolEnvelope } from './toolOutput.ts'
 
 function readStr(value: unknown, key: string): string | undefined {
   if (!value || typeof value !== 'object') return undefined
@@ -55,8 +56,28 @@ export function mapResumeHistory(history: unknown): Message[] {
     if (role === 'tool') {
       const name = readStr(raw, 'name') ?? 'tool'
       const context = readStr(raw, 'context')
-      const tool: Part = { type: 'tool', id: id(), name, state: 'complete' }
-      if (context) tool.summary = context
+      const tool: ToolPartState = { type: 'tool', id: id(), name, state: 'complete' }
+      // Match the live tool part exactly (item 1): primary-arg preview in the
+      // header, plus the (capped) output so resumed tools are collapsible too.
+      if (context) tool.argsPreview = context
+      const rawResult = readStr(raw, 'result_text')
+      if (rawResult) {
+        const { body, omittedNote } = stripOmittedNote(rawResult)
+        const resultText = stripToolEnvelope(body)
+        if (resultText) {
+          tool.resultText = resultText
+          tool.lineCount = resultText.replace(/\s+$/, '').split('\n').length
+        }
+        if (omittedNote) tool.omittedNote = omittedNote
+      }
+      const args = (raw as { args?: unknown }).args
+      if (args && typeof args === 'object') {
+        try {
+          tool.argsText = JSON.stringify(args, null, 2)
+        } catch {
+          /* unstringifiable — leave unset */
+        }
+      }
       if (!currentAssistant) {
         currentAssistant = { role: 'assistant', text: '', parts: [] }
         out.push(currentAssistant)

ui-tui-opentui-v2/src/test/resume.test.ts

@@ -22,7 +22,8 @@ describe('mapResumeHistory (Phase 4b)', () => {
     expect(a1.parts?.map(p => p.type)).toEqual(['text', 'tool']) // text + folded tool, inline
     const tool = a1.parts![1]!
     if (tool.type === 'tool') {
-      expect(tool).toMatchObject({ name: 'terminal', state: 'complete', summary: 'ls -la' })
+      // context → argsPreview (same field as a live tool part, so it renders identically)
+      expect(tool).toMatchObject({ name: 'terminal', state: 'complete', argsPreview: 'ls -la' })
     } else {
       throw new Error('expected a folded tool part')
     }
@@ -33,7 +34,27 @@ describe('mapResumeHistory (Phase 4b)', () => {
     const msgs = mapResumeHistory([{ role: 'tool', name: 'read_file', context: 'foo.ts' }])
     expect(msgs).toHaveLength(1)
     expect(msgs[0]!.role).toBe('assistant')
-    expect(msgs[0]!.parts?.[0]).toMatchObject({ type: 'tool', name: 'read_file', summary: 'foo.ts' })
+    expect(msgs[0]!.parts?.[0]).toMatchObject({ type: 'tool', name: 'read_file', argsPreview: 'foo.ts' })
+  })
+
+  test('folds result_text + args so resumed tools render collapsible like live (item 1)', () => {
+    const msgs = mapResumeHistory([
+      { role: 'assistant', text: 'Running.' },
+      {
+        role: 'tool',
+        name: 'terminal',
+        context: 'ls /usr/bin',
+        args: { command: 'ls /usr/bin' },
+        result_text: '[showing verbose tail; omitted 90 chars]\n{"output":"a\\nb\\nc","exit_code":0}'
+      }
+    ])
+    const tool = msgs[0]!.parts![1]!
+    if (tool.type !== 'tool') throw new Error('expected a folded tool part')
+    expect(tool.argsPreview).toBe('ls /usr/bin')
+    expect(tool.resultText).toBe('a\nb\nc') // label peeled + envelope stripped → collapsible
+    expect(tool.lineCount).toBe(3)
+    expect(tool.omittedNote).toBe('90 chars')
+    expect(tool.argsText).toContain('"command"')
   })
 
   test('ignores non-arrays and unknown roles', () => {