emrg: auto-title new sessions from the first user message (TUI client)

Agent.md

@@ -119,7 +119,7 @@ Community needs voiced in HN agent-UI discussions map directly to EMRG's design:
 pkill -f "emrg.server"; rm -f ~/.emrg/emrgd.token; python -m emrg
 ```
 
-Python: `uv run pytest tests/ -v` (1136) — import check: `uv run python -c "from emrg.client.app import run_client"`
+Python: `uv run pytest tests/ -v` (1144) — import check: `uv run python -c "from emrg.client.app import run_client"`
 GUI: `cd emrg/gui && npm test` (95: 45 daemon_client + 20 conn-manager + 8 integration + 6 build-config + 7 gui-state + 3 preload-api + 4 boot-contract + 2 theme-guard) — syntax: `node --check main.js preload.js daemon_client.js`
 Renderer: `cd emrg/gui/renderer && npm run typecheck && npm test` (448: 5 snapshot-store + 9 utils + 3 ErrorBoundary + 2 App smoke + 11 commands + 4 copywriting + 11 i18n + 11 markdown + 15 transcript + 7 TranscriptView + 15 history + 22 composer + 14 Composer + 12 sidebar + 17 Sidebar + 9 fileTree + 9 FileTree + 16 resultPanel + 8 ResultPanel + 27 workspaceView + 10 WorkspaceView + 10 dialog + 6 Dialog + 9 ConfirmDialog + 9 RenameDialog + 10 dialogLists + 3 HelpDialog + 9 MemoryDialog + 6 SkillsDialog + 9 openSession + 6 WelcomeDialog + 8 OpenSessionDialog + 7 NewSessionDialog + 7 rewind + 8 RewindDialog + 7 GithubDeviceDialog + 15 daemonBridge + 7 DaemonBridgeProvider + 25 Shell + 15 DialogHost + 20 SettingsPanel + 6 TaskFormDialog + 5 RantDialog + 4 vendorMarkdown) + `npm run build` → `renderer/dist/`
 CI: `uv run pytest` (ubuntu + **windows-2025 matrix** — Windows pytest 回归在 PR CI 即失败，v0.2.29 教训 #725) + GUI tests + **actionlint workflow lint** (`rhysd/actionlint@v1.7.12` gate, #444 — workflow 解析错误在 PR CI 即失败，如 `if:` secrets 上下文)

emrg/client/app.py

@@ -4,7 +4,7 @@
 
 from __future__ import annotations
 
-import asyncio, json, logging, os, platform, signal, subprocess, sys, threading, time
+import asyncio, json, logging, os, platform, re, signal, subprocess, sys, threading, time
 try:
  import fcntl # POSIX-only（TUI 非阻塞 stdin）；Windows 无此模块
 except ImportError: # pragma: no cover - Windows
@@ -83,6 +83,29 @@ def _format_status_left(title: str, sid: str, model: str = "") -> str:
  return " ".join(parts)
 
 
+def _auto_title_from_prompt(text: str, max_len: int = 30) -> str | None:
+ """Derive a short session title from the first user message.
+
+ Codex #40492 borrow: unnamed tasks/sessions get a descriptive title
+ automatically. Deterministic text-derived (no LLM call, zero latency,
+ no token cost) — unlike the on-demand LLM auto-title via ``/rename``
+ with an empty title.
+
+ Returns ``None`` when the message is a slash command or has no usable
+ text (session stays untitled in that case). Module-level so it is
+ unit-testable.
+ """
+ if not text or text.lstrip().startswith("/"):
+ return None
+ first = next((ln.strip() for ln in text.splitlines() if ln.strip()), "")
+ if not first:
+ return None
+ first = re.sub(r"\s+", " ", first)
+ if len(first) <= max_len:
+ return first
+ return first[: max_len - 1] + "…"
+
+
 # ── Clipboard image support (platform-adaptive) ─────────────
 
 def _detect_clipboard_image() -> tuple[bool, str | None]:
@@ -2007,6 +2030,15 @@ def _is_image_token(s, i):
  _pending_images[:] = [img for img in _pending_images if img.get("label") in inp.text]
  images = _pending_images or None
  _pending_images = []
+ # Auto-title a fresh, untitled session from its first user
+ # message (Codex #40492 borrow: unnamed sessions/tasks get a
+ # descriptive title automatically). Deterministic text-derived
+ # title — free, no LLM call. Skips slash commands.
+ if msg_count == 1 and not session_title:
+ auto_title = _auto_title_from_prompt(text)
+ if auto_title:
+ await conn.send_command("rename_session", session_id=session_id,
+ cwd=cwd, title=auto_title)
  rid = await conn.send_task(session_id=session_id, cwd=cwd, prompt=text,
  images=images)
  if was_busy:

tests/test_app_auto_title.py

@@ -0,0 +1,49 @@
+"""Tests for _auto_title_from_prompt (Codex #40492 borrow).
+
+New sessions previously displayed the raw session id until the host ran
+`/rename` manually. The auto-title helper derives a short descriptive
+title from the first user message — deterministic, no LLM call.
+"""
+
+from emrg.client.app import _auto_title_from_prompt
+
+
+def test_plain_prompt_kept_verbatim():
+ assert _auto_title_from_prompt("fix the billing bug") == "fix the billing bug"
+
+
+def test_long_prompt_truncated_with_ellipsis():
+ title = _auto_title_from_prompt("x" * 100)
+ assert len(title) == 30
+ assert title.endswith("…")
+
+
+def test_slash_command_skipped():
+ assert _auto_title_from_prompt("/sessions") is None
+ assert _auto_title_from_prompt(" /rename foo bar") is None
+
+
+def test_multiline_uses_first_line():
+ assert _auto_title_from_prompt("first line\nsecond line") == "first line"
+
+
+def test_whitespace_only_returns_none():
+ assert _auto_title_from_prompt("") is None
+ assert _auto_title_from_prompt(" \n ") is None
+
+
+def test_cjk_prompt_truncates_safely():
+ text = "请修复这个 bug，它发生在登录流程中，需要检查 token 刷新逻辑"
+ title = _auto_title_from_prompt(text)
+ assert isinstance(title, str)
+ assert len(title) == 30
+ assert title.endswith("…")
+
+
+def test_collapses_internal_whitespace():
+ assert _auto_title_from_prompt(" hello world ") == "hello world"
+
+
+def test_max_len_custom():
+ assert len(_auto_title_from_prompt("a" * 50, max_len=12)) == 12
+ assert _auto_title_from_prompt("short", max_len=12) == "short"