feat(ui): finished turns keep their tool tree, reasoning and say bubbles, the thread stops dragging the reader down

src/beaver_gateway/backends/claude_sdk.py

@@ -20,6 +20,7 @@ import tempfile
 import time
 import uuid
 import warnings
+from collections import deque
 from collections.abc import Mapping
 from dataclasses import dataclass, field
 from pathlib import Path
@@ -49,7 +50,12 @@ from claude_agent_sdk import (
 from beaver_gateway.agents import policy as policy_mod
 from beaver_gateway.agents import prompts as prompt_assembly
 from beaver_gateway.backends.capture import TurnCapture, TurnUsage
-from beaver_gateway.backends.sessions import Session, SessionClient, SessionPool
+from beaver_gateway.backends.sessions import (
+    STDERR_LINES,
+    Session,
+    SessionClient,
+    SessionPool,
+)
 from beaver_gateway.backends.transcript import (
     build_entries,
     close_open_tool_uses,
@@ -71,6 +77,7 @@ from beaver_gateway.events.stream import (
     build_thinking_delta,
     build_tool_use_block_start,
 )
+from beaver_gateway.security.redact import redact
 
 if TYPE_CHECKING:
     from collections.abc import (
@@ -262,12 +269,7 @@ class ClaudeSdkBackend:
         await self._pool.close(key)
 
     async def interrupt(self, key: str) -> bool:
-        live = self._pool.get(key)
+        return await self._pool.interrupt(key)
-        if live is None or not live.busy:
-            return False
-        live.interrupt_requested = True
-        await live.client.interrupt()
-        return True
 
     def live(self, key: str) -> Session | None:
         return self._pool.get(key)
@@ -674,7 +676,8 @@ class ClaudeSdkBackend:
     async def _spawn(
         self, resume: str | None, *, key: str, spec: _SessionSpec
     ) -> Session:
-        options = self._build_options(resume, key=key, spec=spec)
+        stderr: deque[str] = deque(maxlen=STDERR_LINES)
+        options = self._build_options(resume, key=key, spec=spec, stderr=stderr)
         client = self._factory(options)
         await client.connect()
         _log.info(
@@ -693,6 +696,7 @@ class ClaudeSdkBackend:
             session_id=resume,
             resumed=resume is not None,
             pinned=spec.pinned,
+            stderr=stderr,
         )
         live.reader = asyncio.create_task(self._read(live))
         return live
@@ -701,7 +705,12 @@ class ClaudeSdkBackend:
         return _RunnerClient(options, uid=self._uid)
 
     def _build_options(
-        self, resume: str | None, *, key: str, spec: _SessionSpec
+        self,
+        resume: str | None,
+        *,
+        key: str,
+        spec: _SessionSpec,
+        stderr: deque[str] | None = None,
     ) -> ClaudeAgentOptions:
         agent = self._agent
         opt = agent.options
@@ -747,11 +756,14 @@ class ClaudeSdkBackend:
             plugins=cast("Any", plugins),
             skills="all" if plugins else None,
             max_turns=opt.max_turns,
-            stderr=lambda line: _log.warning(
+            stderr=lambda line: self._stderr(line.rstrip(), stderr),
-                "claude[%s]: %s", agent.name, line.rstrip()
-            ),
         )
 
+    def _stderr(self, line: str, tail: deque[str] | None) -> None:
+        _log.warning("claude[%s]: %s", self._agent.name, line)
+        if tail is not None:
+            tail.append(redact(line))
+
     def _can_use_tool(
         self, key: str
     ) -> Callable[

src/beaver_gateway/backends/processes.py

@@ -0,0 +1,118 @@
+"""What runs under the gateway: the process tree with memory and CPU, and the kill."""
+
+from __future__ import annotations
+
+import contextlib
+import os
+import time
+from dataclasses import dataclass, field
+from pathlib import Path
+from typing import Any
+
+import psutil
+
+from beaver_gateway.security.redact import redact
+
+__all__ = ["Processes", "subtree"]
+
+_VALUE_HIDDEN = frozenset(
+    {
+        "--system-prompt",
+        "--append-system-prompt",
+        "--mcp-config",
+        "--settings",
+        "--agents",
+    }
+)
+_ARG_CLIP = 80
+_COMMAND_CLIP = 240
+
+
+@dataclass(slots=True)
+class Processes:
+    root: int = field(default_factory=os.getpid)
+    _cpu_seen: dict[int, tuple[float, float]] = field(default_factory=dict)
+
+    def tree_parents_first(self) -> list[dict[str, Any]]:
+        try:
+            found = psutil.Process(self.root).children(recursive=True)
+        except psutil.Error:
+            return []
+        now = time.monotonic()
+        rows: dict[int, dict[str, Any]] = {}
+        for process in found:
+            with contextlib.suppress(psutil.Error), process.oneshot():
+                spent = process.cpu_times()
+                rows[process.pid] = {
+                    "pid": process.pid,
+                    "parent": process.ppid(),
+                    "name": process.name(),
+                    "command": _command(process.cmdline()),
+                    "rss": process.memory_info().rss,
+                    "cpu": self._rate(process.pid, spent.user + spent.system, now),
+                    "age_seconds": round(time.time() - process.create_time(), 1),
+                }
+        self._cpu_seen = {p: seen for p, seen in self._cpu_seen.items() if p in rows}
+        children: dict[int, list[int]] = {}
+        for pid, row in rows.items():
+            parent = row["parent"] if row["parent"] in rows else self.root
+            children.setdefault(parent, []).append(pid)
+        ordered: list[dict[str, Any]] = []
+
+        def walk(parent: int, depth: int) -> None:
+            for pid in sorted(children.get(parent, ())):
+                ordered.append({**rows[pid], "depth": depth})
+                walk(pid, depth + 1)
+
+        walk(self.root, 0)
+        return ordered
+
+    def kill_own_descendant(self, pid: int) -> bool:
+        try:
+            owned = psutil.Process(self.root).children(recursive=True)
+            target = next((p for p in owned if p.pid == pid), None)
+            if target is None:
+                return False
+            doomed = [*target.children(recursive=True), target]
+        except psutil.Error:
+            return False
+        for process in doomed:
+            with contextlib.suppress(psutil.Error):
+                process.kill()
+        return True
+
+    def _rate(self, pid: int, spent: float, now: float) -> float | None:
+        before = self._cpu_seen.get(pid)
+        self._cpu_seen[pid] = (spent, now)
+        if before is None or now <= before[1]:
+            return None
+        return round(100 * max(spent - before[0], 0.0) / (now - before[1]), 1)
+
+
+def subtree(rows: list[dict[str, Any]], pid: int | None) -> list[dict[str, Any]]:
+    start = next((i for i, row in enumerate(rows) if row["pid"] == pid), None)
+    if start is None:
+        return []
+    base = rows[start]["depth"]
+    out = [{**rows[start], "depth": 0}]
+    for row in rows[start + 1 :]:
+        if row["depth"] <= base:
+            break
+        out.append({**row, "depth": row["depth"] - base})
+    return out
+
+
+def _command(argv: list[str]) -> str:
+    if not argv:
+        return ""
+    parts = [Path(argv[0]).name]
+    hide = False
+    for arg in argv[1:]:
+        if hide:
+            parts.append("…")
+            hide = False
+            continue
+        hide = arg in _VALUE_HIDDEN
+        parts.append(arg if len(arg) <= _ARG_CLIP else f"{arg[:_ARG_CLIP]}…")
+    command = redact(" ".join(parts))
+    return command if len(command) <= _COMMAND_CLIP else f"{command[:_COMMAND_CLIP]}…"

src/beaver_gateway/backends/sessions.py

@@ -13,12 +13,15 @@ import contextlib
 import logging
 import os
 import time
+from collections import deque
 from dataclasses import dataclass, field
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Protocol
 
 import psutil
 
+from beaver_gateway.backends.processes import Processes, subtree
+
 if TYPE_CHECKING:
     from collections.abc import (
         AsyncIterable,
@@ -43,6 +46,7 @@ DEFAULT_TTL: Mapping[str, float | None] = {
 
 _EVICT_ORDER = {"fork": 0, "job": 0, "deep": 1, "branch": 2, "master": 3}
 _RSS_HEADROOM = 0.8
+STDERR_LINES = 200
 
 
 class SessionClient(Protocol):
@@ -86,6 +90,7 @@ class Session:
     """Summary of the last task notification, the pending turn's prompt."""
     observer: Callable[[Any], None] | None = None
     """The last turn's observer; sees subagent traffic between turns."""
+    stderr: deque[str] = field(default_factory=lambda: deque(maxlen=STDERR_LINES))
 
     @property
     def busy(self) -> bool:
@@ -121,6 +126,7 @@ class SessionPool:
         self._max_live = max_live
         self._ttl = dict(ttl)
         self._reap_interval = reap_interval
+        self._processes = Processes()
 
     def __len__(self) -> int:
         return len(self._sessions)
@@ -168,19 +174,6 @@ class SessionPool:
                 total += child.memory_info().rss
         return total
 
-    @staticmethod
-    def rss_of(session: Session) -> int | None:
-        pid = session.pid
-        if pid is None:
-            return None
-        try:
-            process = psutil.Process(pid)
-            return process.memory_info().rss + sum(
-                c.memory_info().rss for c in process.children(recursive=True)
-            )
-        except psutil.Error:
-            return None
-
     def over_limit(self) -> bool:
         if self._rss_limit is not None:
             return self.rss() > self._rss_limit * _RSS_HEADROOM
@@ -214,11 +207,21 @@ class SessionPool:
         _log.info("closing session %s (%s, %s)", session.session_id, session.kind, key)
         if session.reader is not None and session.reader is not asyncio.current_task():
             session.reader.cancel()
+        if session.attached:
+            session.inbox.put_nowait(RuntimeError(f"session {key} was closed"))
         try:
             await session.client.disconnect()
         except Exception:  # noqa: BLE001
             _log.exception("disconnect failed for session %s", session.session_id)
 
+    async def interrupt(self, key: str) -> bool:
+        session = self._sessions.get(key)
+        if session is None or not session.busy:
+            return False
+        session.interrupt_requested = True
+        await session.client.interrupt()
+        return True
+
     async def close_all(self, *, agent: str | None = None) -> None:
         for session in list(self._sessions.values()):
             if agent is None or session.agent == agent:
@@ -246,15 +249,25 @@ class SessionPool:
                 _log.exception("session reaper failed")
 
     def snapshot(self) -> list[dict[str, Any]]:
+        return self.census()["sessions"]
+
+    def census(self) -> dict[str, Any]:
         now = time.monotonic()
-        return [
+        rows = self._processes.tree_parents_first()
+        owned: set[int] = set()
+        sessions: list[dict[str, Any]] = []
+        for s in self._sessions.values():
+            tree = subtree(rows, s.pid)
+            owned.update(row["pid"] for row in tree)
+            sessions.append(
                 {
                     "key": s.key,
                     "agent": s.agent,
                     "kind": s.kind,
                     "session_id": s.session_id,
                     "pid": s.pid,
-                "rss": self.rss_of(s),
+                    "rss": sum(row["rss"] for row in tree) if tree else None,
+                    "cpu": _cpu(tree),
                     "idle_seconds": round(now - s.last_used, 1),
                     "age_seconds": round(now - s.created_at, 1),
                     "turns": s.turns,
@@ -264,9 +277,29 @@ class SessionPool:
                     "pending_question": s.pending_question,
                     "pinned": s.pinned,
                     "dirty": s.dirty,
+                    "processes": tree,
                 }
-            for s in self._sessions.values()
+            )
-        ]
+        return {
+            "rss": sum(row["rss"] for row in rows),
+            "rss_limit": self._rss_limit,
+            "cpu": _cpu(rows),
+            "sessions": sessions,
+            "others": [row for row in rows if row["pid"] not in owned],
+        }
+
+    async def kill(self, pid: int) -> bool:
+        if not self._processes.kill_own_descendant(pid):
+            return False
+        for session in list(self._sessions.values()):
+            if session.pid == pid:
+                await self.close(session.key)
+        return True
+
+
+def _cpu(rows: list[dict[str, Any]]) -> float | None:
+    rates = [row["cpu"] for row in rows if row["cpu"] is not None]
+    return round(sum(rates), 1) if rates else None
 
 
 def cgroup_limit() -> int | None:

src/beaver_gateway/backends/transcript.py

@@ -164,9 +164,9 @@ def build_entries(
 
 
 def messages_from_entries(
-    entries: Iterable[Mapping[str, Any]], *, with_ts: bool = False
+    entries: Iterable[Mapping[str, Any]], *, stamped: bool = False
 ) -> list[dict[str, Any]]:
-    """Messages as the model saw them; ``with_ts`` adds when each one was written."""
+    """Messages as the model saw them; ``stamped`` adds each one's entry id and time."""
     out: list[dict[str, Any]] = []
     last_message_id: str | None = None
     for entry in entries:
@@ -189,7 +189,8 @@ def messages_from_entries(
                     "role": "user",
                     "content": _user_content(content),
                 }
-                if with_ts:
+                if stamped:
+                    message_out["id"] = entry.get("uuid")
                     message_out["ts"] = entry.get("timestamp")
                 out.append(message_out)
             last_message_id = None
@@ -205,7 +206,8 @@ def messages_from_entries(
             out[-1]["content"].extend(blocks)
         else:
             message_out: dict[str, Any] = {"role": "assistant", "content": blocks}
-            if with_ts:
+            if stamped:
+                message_out["id"] = entry.get("uuid")
                 message_out["ts"] = entry.get("timestamp")
             out.append(message_out)
         last_message_id = message_id

src/beaver_gateway/conversations/rows.py

@@ -19,6 +19,7 @@ from beaver_gateway.backends.transcript import (
 )
 from beaver_gateway.conversations.kinds import KINDS, Kind
 from beaver_gateway.conversations.state import State, iso
+from beaver_gateway.conversations.texts import split_service
 from beaver_gateway.frontends.markdown.history import load_messages
 from beaver_gateway.storage.models import (
     Conversation,
@@ -482,9 +483,31 @@ class Rows(State):
                 return await load_messages(
                     session, conversation_id=cast("int", conv.id)
                 )
-        return messages_from_entries(
+        messages = messages_from_entries(
-            cast("Any", await self.entries(conv)), with_ts=True
+            cast("Any", await self.entries(conv)), stamped=True
         )
+        return [self._unwrapped(message) for message in messages]
+
+    def _unwrapped(self, message: dict[str, Any]) -> dict[str, Any]:
+        if message["role"] != "user":
+            return message
+        content = message["content"]
+        if isinstance(content, str):
+            text, service = split_service(content, self._texts)
+            return (
+                message
+                if service is None
+                else {**message, "content": text, "service": service}
+            )
+        for index, block in enumerate(content):
+            if block.get("type") != "text":
+                continue
+            text, service = split_service(str(block.get("text") or ""), self._texts)
+            if service is not None:
+                blocks = [*content]
+                blocks[index] = {**block, "text": text}
+                return {**message, "content": blocks, "service": service}
+        return message
 
     async def entries(self, conv: Conversation, *, subpath: str = "") -> list[Any]:
         if conv.session_id is None:

src/beaver_gateway/conversations/texts.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import re
 from dataclasses import dataclass, field
 from typing import TYPE_CHECKING
 
@@ -22,6 +23,7 @@ __all__ = [
     "NewDayContext",
     "SeedContext",
     "UserSaid",
+    "split_service",
 ]
 
 
@@ -127,3 +129,12 @@ class ConversationTexts:
         "; {fixed} open tool calls received tool_result «{interrupted}»"
     )
     envelope: EnvelopeTexts = field(default_factory=EnvelopeTexts)
+
+
+def split_service(text: str, texts: ConversationTexts) -> tuple[str, str | None]:
+    bundle = re.escape(texts.bundle_header).replace(r"\{since\}", ".+")
+    heads = f"{re.escape(texts.envelope.header)}|{bundle}"
+    match = re.search(rf"(?:\A|\n\n)(?=(?:{heads})$)", text, re.MULTILINE)
+    if match is None:
+        return text, None
+    return text[: match.start()], text[match.end() :]

src/beaver_gateway/events/bus.py

@@ -57,10 +57,16 @@ class EventBus:
                 event = await queue.get()
                 if (
                     conversation_id is None
-                    or event.get("conversation_id") == conversation_id
+                    or _conversation_of(event) == conversation_id
                 ):
                     yield event
 
     @property
     def subscribers(self) -> int:
         return len(self._subscribers)
+
+
+def _conversation_of(event: Event) -> Any:
+    if event["type"].startswith("conversation."):
+        return event.get("id")
+    return event.get("conversation_id")

src/beaver_gateway/frontends/api/frontend.py

@@ -55,6 +55,7 @@ if TYPE_CHECKING:
     from collections.abc import AsyncIterator, Iterable, Sequence
     from pathlib import Path
 
+    from beaver_gateway.backends.sessions import Session, SessionPool
     from beaver_gateway.conversations.service import Conversations
     from beaver_gateway.frontends.base import GatewayRuntime
     from beaver_gateway.jobs.scheduler import Job, Scheduler
@@ -633,15 +634,74 @@ def build_app(  # noqa: PLR0915
         await require_token(request, runtime, scope=SCOPE)
         return _sse(runtime, conversation_id=None)
 
+    def pool_of() -> SessionPool:
+        if runtime.pool is None:
+            raise HTTPException(status.HTTP_404_NOT_FOUND, "no session pool")
+        return runtime.pool
+
+    def session_of(key: str) -> Session:
+        session = pool_of().get(key)
+        if session is None:
+            raise HTTPException(status.HTTP_404_NOT_FOUND, f"no live session {key}")
+        return session
+
     @app.get("/sessions")
     async def sessions(request: Request) -> dict[str, Any]:
         await require_token(request, runtime, scope=SCOPE)
-        pool = runtime.pool
+        if runtime.pool is None:
             return {
-            "rss": pool.rss() if pool is not None else None,
+                "rss": None,
-            "rss_limit": pool.rss_limit if pool is not None else None,
+                "rss_limit": None,
-            "sessions": pool.snapshot() if pool is not None else [],
+                "cpu": None,
+                "sessions": [],
+                "others": [],
             }
+        return runtime.pool.census()
+
+    @app.get("/sessions/{key}/stderr")
+    async def session_stderr(key: str, request: Request) -> dict[str, Any]:
+        await require_token(request, runtime, scope=ADMIN_SCOPE)
+        return {"key": key, "lines": list(session_of(key).stderr)}
+
+    @app.post("/sessions/{key}/interrupt")
+    async def session_interrupt(key: str, request: Request) -> dict[str, Any]:
+        token = await require_token(request, runtime, scope=SCOPE)
+        session = session_of(key)
+        interrupted = await pool_of().interrupt(key)
+        await audit.log(
+            runtime,
+            actor=f"token:{token}",
+            kind="session_interrupt",
+            agent_name=session.agent,
+            session=key,
+            interrupted=interrupted,
+        )
+        return {"key": key, "interrupted": interrupted}
+
+    @app.post("/sessions/{key}/close")
+    async def session_close(key: str, request: Request) -> dict[str, Any]:
+        token = await require_token(request, runtime, scope=ADMIN_SCOPE)
+        session = session_of(key)
+        await pool_of().close(key)
+        await audit.log(
+            runtime,
+            actor=f"token:{token}",
+            kind="session_close",
+            agent_name=session.agent,
+            session=key,
+            busy=session.busy,
+        )
+        return {"key": key, "closed": True}
+
+    @app.post("/processes/{pid}/kill")
+    async def process_kill(pid: int, request: Request) -> dict[str, Any]:
+        token = await require_token(request, runtime, scope=ADMIN_SCOPE)
+        if not await pool_of().kill(pid):
+            raise HTTPException(
+                status.HTTP_404_NOT_FOUND, f"no process {pid} under the gateway"
+            )
+        await audit.log(runtime, actor=f"token:{token}", kind="process_kill", pid=pid)
+        return {"pid": pid, "killed": True}
 
     @app.get("/schedules")
     async def schedules(request: Request) -> dict[str, Any]:

src/beaver_gateway/frontends/telegram/drafts.py

@@ -9,6 +9,7 @@ from __future__ import annotations
 
 import asyncio
 import contextlib
+import html
 import logging
 import time
 import zlib
@@ -26,6 +27,7 @@ __all__ = ["Draft"]
 _log = logging.getLogger("beaver_gateway.frontends.telegram.drafts")
 
 _TAIL = 3500
+_REASONING_TAIL = 400
 _KEEPALIVE = 20.0
 
 
@@ -47,6 +49,7 @@ class Draft:
         self._interval = interval
         self.status = status
         self.text = ""
+        self.reasoning = ""
         self._paused = False
         self._dirty = True
         self._broken = False
@@ -80,9 +83,20 @@ class Draft:
             self.text = self.text.rstrip() + "\n\n" + text.lstrip()
         else:
             self.text += text
+        self.reasoning = ""
         self._paused = False
         self._dirty = True
 
+    def think(self, text: str) -> None:
+        if text:
+            self.reasoning += text
+            self._dirty = True
+
+    def rethink(self) -> None:
+        if self.reasoning:
+            self.reasoning = ""
+            self._dirty = True
+
     async def stop(self) -> None:
         """Stop pushing and wait for the push in flight.
 
@@ -146,8 +160,21 @@ class Draft:
         )
 
     def _render(self) -> tuple[str, str]:
+        rendered, plain = [to_html(self.status)], [self.status]
+        thought = _tail(self.reasoning.strip(), _REASONING_TAIL)
+        if thought:
+            rendered.append(f"<blockquote>{html.escape(thought)}</blockquote>")
+            plain.append(thought)
         tail = self.text[-_TAIL:]
-        if not tail.strip():
+        if tail.strip():
-            return to_html(self.status), self.status
+            rendered.append(to_html_tail(self.text, _TAIL))
-        rendered = f"{to_html(self.status)}\n\n{to_html_tail(self.text, _TAIL)}"
+            plain.append(tail)
-        return rendered, f"{self.status}\n\n{tail}"
+        return "\n\n".join(rendered), "\n\n".join(plain)
+
+
+def _tail(text: str, limit: int) -> str:
+    if len(text) <= limit:
+        return text
+    cut = text[-limit:]
+    _, _, rest = cut.partition(" ")
+    return f"… {rest or cut}"

src/beaver_gateway/frontends/telegram/frontend.py

@@ -994,10 +994,13 @@ class TelegramFrontend(Frontend):
                     draft.append(progress)
                 else:
                     draft.set_status(self.texts.thinking)
+                    draft.think(progress)
         elif kind == "content_block_start":
             block = raw.get("content_block") or {}
             if block.get("type") == "tool_use":
                 draft.set_status(self._tool_status(block.get("name") or "", None))
+            elif block.get("type") == "thinking":
+                draft.rethink()
 
     def _tool_status(self, name: Any, tool_input: Any) -> str:
         label = status_label(str(name), tool_input, self.texts.tool_labels)

src/beaver_gateway/vault/watch.py

@@ -13,6 +13,7 @@ import difflib
 import fnmatch
 import logging
 import os
+import re
 from dataclasses import dataclass, field
 from datetime import UTC, datetime
 from pathlib import Path
@@ -30,6 +31,8 @@ __all__ = ["Change", "VaultFilter", "VaultWatch", "WatchRules"]
 
 _log = logging.getLogger("beaver_gateway.vault.watch")
 
+_FENCE = re.compile(r"^\s*(`{3,}|~{3,})\s*(.*?)\s*$")
+
 
 @dataclass(frozen=True, slots=True)
 class WatchRules:
@@ -44,6 +47,8 @@ class WatchRules:
     names: tuple[str, ...] = ()
     ignore: tuple[str, ...] = ()
     suffixes: tuple[str, ...] = (".md",)
+    skip_fences: tuple[str, ...] = ("tasks", "dataview", "dataviewjs")
+    """Fenced blocks of these languages are queries: ``full`` files drop them."""
 
     def kind(self, rel: str, *, today: str) -> str | None:
         """The most specific matching pattern wins, whichever list it is in."""
@@ -140,7 +145,7 @@ class VaultWatch:
             if kind is None:
                 continue
             with contextlib.suppress(OSError):
-                lines = _read_lines(path)
+                lines = self._lines(path, full=kind == "full")
                 self._seen[rel] = _Seen(
                     lines=lines if kind == "full" else None, count=len(lines)
                 )
@@ -158,7 +163,7 @@ class VaultWatch:
             self._pending.pop(rel, None)
             return None
         stat = path.stat()
-        lines = _read_lines(path)
+        lines = self._lines(path, full=kind == "full")
         seen = self._seen.get(rel)
         change = Change(
             path=rel,
@@ -186,12 +191,16 @@ class VaultWatch:
         for change in changes:
             path = self.root / change.path
             with contextlib.suppress(OSError):
-                lines = _read_lines(path)
+                lines = self._lines(path, full=change.full)
                 self._seen[change.path] = _Seen(
                     lines=lines if change.full else None, count=len(lines)
                 )
         return changes
 
+    def _lines(self, path: Path, *, full: bool) -> list[str]:
+        lines = _read_lines(path)
+        return _prose(lines, self.rules.skip_fences) if full else lines
+
     def _rel(self, path: Path) -> str:
         return path.resolve().relative_to(self.root.resolve()).as_posix()
 
@@ -216,6 +225,37 @@ def _read_lines(path: Path) -> list[str]:
     return path.read_text(encoding="utf-8", errors="replace").splitlines()
 
 
+def _prose(lines: list[str], skip_fences: tuple[str, ...]) -> list[str]:
+    start = 0
+    if lines and lines[0].strip() == "---":
+        closing = next(
+            (i for i, line in enumerate(lines[1:], 1) if line.strip() == "---"), None
+        )
+        start = closing + 1 if closing is not None else 0
+    out: list[str] = []
+    fence: str | None = None
+    skipping = False
+    for line in lines[start:]:
+        match = _FENCE.match(line)
+        if fence is None and match:
+            fence = match.group(1)
+            language = match.group(2).split(maxsplit=1)[0] if match.group(2) else ""
+            skipping = language.lower() in skip_fences
+        elif fence is not None and match and _closes(match, fence):
+            fence = None
+            if skipping:
+                skipping = False
+                continue
+        if not skipping and line.strip():
+            out.append(line)
+    return out
+
+
+def _closes(match: re.Match[str], fence: str) -> bool:
+    mark = match.group(1)
+    return mark[0] == fence[0] and len(mark) >= len(fence) and not match.group(2)
+
+
 def _added(old: list[str], new: list[str]) -> list[str]:
     matcher = difflib.SequenceMatcher(a=old, b=new, autojunk=False)
     added: list[str] = []

tests/test_api.py

@@ -396,6 +396,54 @@ async def test_describe_snapshots_open_tools_and_records_rate_limit(
     assert page["offset"] == 0 and len(page["entries"]) == 1
 
 
+async def test_sessions_show_their_processes_and_take_orders(world: World) -> None:
+    world.backend._factory = ToolClient  # noqa: SLF001
+    api = Api(world)
+    api.store.grant("api-only", "weak", scope="api")
+    weak = {"Authorization": "Bearer weak"}
+    conv = await world.conversations.create(kind="master", agent="a", origin="test")
+    key = conv.external_id
+    ScriptedClient.hold = asyncio.Event()
+    await world.conversations.post(conv, "go")
+    await asyncio.sleep(0.3)
+    census = await api.get("/sessions")
+    (row,) = census["sessions"]
+    assert row["key"] == key and row["busy"]
+    assert row["processes"] == [] and row["cpu"] is None
+    assert isinstance(census["others"], list)
+    live = world.pool.get(key)
+    assert live is not None
+    live.stderr.append("warning: something")
+    stderr = await api.get(f"/sessions/{key}/stderr")
+    assert stderr["lines"] == ["warning: something"]
+    for path in (f"/sessions/{key}/close", "/processes/1/kill"):
+        assert (await api.http.post(path, headers=weak)).status_code == 403
+    assert (
+        await api.http.get(f"/sessions/{key}/stderr", headers=weak)
+    ).status_code == 403
+
+    closed = await api.http.post(f"/sessions/{key}/close", headers=HEADERS)
+    assert closed.json() == {"key": key, "closed": True}
+    assert world.pool.get(key) is None
+    deadline = asyncio.get_running_loop().time() + 5
+    while ("user", "failed") not in await world.statuses(conv):
+        assert asyncio.get_running_loop().time() < deadline, "the cut turn hangs"
+        await asyncio.sleep(0.02)
+    again = await api.http.post(f"/sessions/{key}/close", headers=HEADERS)
+    assert again.status_code == 404
+    gone = await api.http.post("/processes/999999999/kill", headers=HEADERS)
+    assert gone.status_code == 404
+
+    ScriptedClient.hold = asyncio.Event()
+    await world.conversations.post(conv, "once more")
+    await asyncio.sleep(0.3)
+    interrupted = await api.http.post(f"/sessions/{key}/interrupt", headers=weak)
+    assert interrupted.json() == {"key": key, "interrupted": True}
+    assert ScriptedClient.instances[-1].interrupted
+    kinds = [r["kind"] for r in (await api.get("/audit"))["records"]]
+    assert kinds == ["session_interrupt", "session_close"]
+
+
 async def test_tokens_and_audit_need_admin_scope(world: World) -> None:
     api = Api(world)
     api.store.grant("api-only", "weak", scope="api")

tests/test_conversations.py

@@ -1052,3 +1052,23 @@ def test_reply_text_keeps_progress_updates_and_drops_hidden_reasoning() -> None:
 def test_reply_text_on_a_plain_answer_is_unchanged() -> None:
     blocks = [AnthropicTextBlock(type="text", text="  just an answer  ")]
     assert reply_text(blocks, thinking_is_progress=True) == "just an answer"
+
+
+async def test_a_conversation_stream_carries_updates_about_that_conversation() -> None:
+    bus = EventBus()
+    seen: list[tuple[str, str | None]] = []
+
+    async def collect() -> None:
+        async for event in bus.stream(conversation_id="c1"):
+            seen.append((event["type"], event.get("id")))
+            if len(seen) == 2:
+                return
+
+    task = asyncio.create_task(collect())
+    await asyncio.sleep(0)
+    bus.publish("conversation.updated", id="c2", running_turn=None)
+    bus.publish("conversation.updated", id="c1", running_turn=None)
+    bus.publish("stream", conversation_id="c2")
+    bus.publish("stream", conversation_id="c1")
+    await asyncio.wait_for(task, 1)
+    assert seen == [("conversation.updated", "c1"), ("stream", None)]

tests/test_envelope.py

@@ -7,7 +7,11 @@ from test_conversations import ScriptedClient, World, world
 
 from beaver_gateway.conversations.service import UserSaid
 from beaver_gateway.conversations.envelope import Envelope, RecallContext, render
-from beaver_gateway.conversations.texts import EnvelopeTexts
+from beaver_gateway.conversations.texts import (
+    ConversationTexts,
+    EnvelopeTexts,
+    split_service,
+)
 from beaver_gateway.vault.watch import Change, VaultWatch, WatchRules
 
 __all__ = ["world"]
@@ -77,6 +81,37 @@ def test_watch_reports_only_added_lines_with_mtime() -> None:
     assert only.added == ["- 14:00 снова"]
 
 
+def test_a_templated_note_shows_its_text_without_queries_or_frontmatter() -> None:
+    root, watch = vault()
+    rel = f"дни/{watch.today()}.md"
+    diary = root / rel
+    watch._seen.pop(rel)
+    diary.write_text(
+        "---\ntags:\n  - дни\n---\n## сводка\n- \n\n\n---\n\n# планы\nпросрочены:\n"
+        "```tasks\nnot done\ndue before 2026-10-13\n```\n"
+        "обязательно сегодня:\n~~~dataview\nlist\n~~~\n"
+        "```python\nprint(1)\n```\n06:04 - спать\n"
+    )
+    watch.note(diary)
+    (change,) = watch.take()
+    assert change.added == [
+        "## сводка",
+        "- ",
+        "---",
+        "# планы",
+        "просрочены:",
+        "обязательно сегодня:",
+        "```python",
+        "print(1)",
+        "```",
+        "06:04 - спать",
+    ]
+    append(diary, "```tasks\ndone on 2026-10-13\n```\n07:10 - встал\n")
+    watch.note(diary)
+    (later,) = watch.take()
+    assert later.added == ["07:10 - встал"]
+
+
 def test_envelope_respects_ceilings_and_names_only_window() -> None:
     root, watch = vault()
     today = watch.today()
@@ -129,6 +164,24 @@ def test_render_hits_total_ceiling() -> None:
     assert lines[1] == "time: 2026-08-26 13:04 (Warsaw)"
 
 
+def test_the_users_words_part_from_what_the_gateway_put_under_them() -> None:
+    texts = ConversationTexts()
+    envelope = f"{HEADER}\ntime: 2026-10-13 10:00 (UTC)"
+    bundle = texts.bundle_header.format(since="2026-10-13T10:00:00+00:00")
+    injects = f"{bundle}\n- [cron] tick"
+    assert split_service(f"hello\n\n{envelope}", texts) == ("hello", envelope)
+    assert split_service(f"hello\n\n{envelope}\n\n{injects}", texts) == (
+        "hello",
+        f"{envelope}\n\n{injects}",
+    )
+    assert split_service(f"hello\n\n{injects}", texts) == ("hello", injects)
+    assert split_service(f"\n\n{envelope}", texts) == ("", envelope)
+    assert split_service("hello\n\n[a note of mine]\nmore", texts) == (
+        "hello\n\n[a note of mine]\nmore",
+        None,
+    )
+
+
 async def test_master_turn_gets_envelope_after_text_and_before_injects(
     world: World,
 ) -> None:

tests/test_processes.py

@@ -0,0 +1,92 @@
+import os
+import subprocess
+import sys
+import time
+
+from beaver_gateway.backends.processes import Processes, _command, subtree
+
+SLEEP = "import time; time.sleep(60)"
+NEST = (
+    "import subprocess, sys, time; "
+    f"subprocess.Popen([sys.executable, '-c', {SLEEP!r}]); time.sleep(60)"
+)
+
+
+def spawn(code: str) -> subprocess.Popen[bytes]:
+    return subprocess.Popen([sys.executable, "-c", code])
+
+
+def rows_under(processes: Processes, pid: int, count: int) -> list[dict]:
+    deadline = time.monotonic() + 5
+    while time.monotonic() < deadline:
+        rows = subtree(processes.tree_parents_first(), pid)
+        if len(rows) >= count:
+            return rows
+        time.sleep(0.05)
+    msg = f"{pid} never grew to {count} processes"
+    raise AssertionError(msg)
+
+
+def test_the_tree_shows_what_the_gateway_started_and_what_it_costs() -> None:
+    child = spawn(SLEEP)
+    try:
+        processes = Processes()
+        (row,) = rows_under(processes, child.pid, 1)
+        assert row["parent"] == os.getpid()
+        assert row["depth"] == 0
+        assert row["rss"] > 0
+        assert row["cpu"] is None
+        assert "time.sleep" in row["command"]
+        (again,) = rows_under(processes, child.pid, 1)
+        assert again["cpu"] is not None
+    finally:
+        child.kill()
+        child.wait()
+
+
+def test_kill_takes_the_branch_and_nothing_the_gateway_did_not_start() -> None:
+    parent = spawn(NEST)
+    try:
+        processes = Processes()
+        top, nested = rows_under(processes, parent.pid, 2)
+        assert (top["depth"], nested["depth"]) == (0, 1)
+        assert not processes.kill_own_descendant(os.getpid())
+        assert not processes.kill_own_descendant(os.getppid())
+        assert processes.kill_own_descendant(parent.pid)
+        parent.wait(timeout=5)
+        alive = {row["pid"] for row in processes.tree_parents_first()}
+        assert not alive & {top["pid"], nested["pid"]}
+    finally:
+        parent.kill()
+        parent.wait()
+
+
+def test_a_subtree_ends_at_the_next_sibling() -> None:
+    rows = [
+        {"pid": 1, "depth": 0},
+        {"pid": 2, "depth": 1},
+        {"pid": 3, "depth": 2},
+        {"pid": 4, "depth": 1},
+        {"pid": 5, "depth": 0},
+    ]
+    assert [(r["pid"], r["depth"]) for r in subtree(rows, 2)] == [(2, 0), (3, 1)]
+    assert [r["pid"] for r in subtree(rows, 1)] == [1, 2, 3, 4]
+    assert subtree(rows, 9) == []
+    assert subtree(rows, None) == []
+
+
+def test_a_command_line_keeps_prompts_and_configs_to_itself() -> None:
+    argv = [
+        "/opt/claude/claude",
+        "--model",
+        "m",
+        "--system-prompt",
+        "you are a beaver",
+        "--mcp-config",
+        '{"gateway": {"headers": {"Authorization": "Bearer abc"}}}',
+        "x" * 100,
+    ]
+    assert _command(argv) == (
+        "claude --model m --system-prompt … --mcp-config … " + "x" * 80 + "…"
+    )
+    assert _command([]) == ""

tests/test_telegram.py

@@ -1228,18 +1228,50 @@ def test_progress_updates_reach_the_draft_but_hidden_reasoning_does_not() -> Non
     assert draft.status == texts.writing
 
 
-def test_reasoning_from_an_agent_whose_thinking_is_not_progress_stays_hidden() -> None:
+def test_reasoning_rides_under_the_status_and_never_reaches_the_text() -> None:
     draft = _progress_draft()
     texts = TelegramTexts()
     stub = SimpleNamespace(_drafts={"k": draft}, texts=texts)
-    TelegramFrontend._feed_draft(
+    feed = functools.partial(
-        cast("Any", stub),
+        TelegramFrontend._feed_draft, cast("Any", stub), "k", thinking_is_progress=False
-        "k",
-        _thinking_delta("weighing it"),
-        thinking_is_progress=False,
     )
+
+    feed(_thinking_delta("weighing <it> "))
+    feed(_thinking_delta("against the note"))
     assert draft.text == ""
     assert draft.status == texts.thinking
+    assert draft._render() == (
+        f"{texts.thinking}\n\n"
+        "<blockquote>weighing &lt;it&gt; against the note</blockquote>",
+        f"{texts.thinking}\n\nweighing <it> against the note",
+    )
+
+    feed(
+        {
+            "event": {
+                "type": "content_block_start",
+                "index": 2,
+                "content_block": {"type": "thinking"},
+            }
+        }
+    )
+    assert draft.reasoning == ""
+    feed(_thinking_delta("word " * 200))
+    shown = draft._render()[1].removeprefix(f"{texts.thinking}\n\n")
+    assert shown.startswith("… word")
+    assert len(shown) <= 402
+
+    feed(
+        {
+            "event": {
+                "type": "content_block_delta",
+                "index": 3,
+                "delta": {"type": "text_delta", "text": "Done."},
+            }
+        }
+    )
+    assert draft.reasoning == ""
+    assert draft._render()[1] == f"{texts.writing}\n\nDone."
 
 
 def test_a_tool_call_between_progress_updates_starts_a_new_paragraph() -> None:

ui/src/lib/api/client.ts

@@ -313,6 +313,22 @@ export class ApiClient {
     return this.get("/api/sessions");
   }
 
+  sessionStderr(key: string): Promise<{ key: string; lines: string[] }> {
+    return this.get(`/api/sessions/${encodeURIComponent(key)}/stderr`);
+  }
+
+  interruptSession(key: string): Promise<{ interrupted: boolean }> {
+    return this.post(`/api/sessions/${encodeURIComponent(key)}/interrupt`);
+  }
+
+  closeSession(key: string): Promise<{ closed: boolean }> {
+    return this.post(`/api/sessions/${encodeURIComponent(key)}/close`);
+  }
+
+  killProcess(pid: number): Promise<{ killed: boolean }> {
+    return this.post(`/api/processes/${pid}/kill`);
+  }
+
   jobs(): Promise<JobsResponse> {
     return this.get("/api/jobs");
   }

ui/src/lib/api/types.ts

@@ -106,7 +106,9 @@ export interface ContentBlock {
 
 export interface HistoryMessage {
   content: string | ContentBlock[];
+  id?: string | null;
   role: "user" | "assistant";
+  service?: string;
   // When the first block of this message was written; absent for old rows.
   ts?: string | null;
 }
@@ -144,17 +146,31 @@ export interface AgentsResponse {
   mcps: { name: string; kind: string }[];
 }
 
+export interface ProcessRow {
+  age_seconds: number;
+  command: string;
+  cpu: number | null;
+  depth: number;
+  name: string;
+  parent: number;
+  pid: number;
+  rss: number;
+}
+
 export interface SessionRow {
   age_seconds: number;
   agent: string;
   busy: boolean;
+  cpu: number | null;
   dirty: boolean;
   idle_seconds: number;
   key: string;
   kind: string;
+  pending: number;
   pending_question: boolean;
   pid: number | null;
   pinned: boolean;
+  processes: ProcessRow[];
   rss: number | null;
   running_turn: string | null;
   session_id: string | null;
@@ -162,6 +178,8 @@ export interface SessionRow {
 }
 
 export interface SessionsResponse {
+  cpu: number | null;
+  others: ProcessRow[];
   rss: number | null;
   rss_limit: number | null;
   sessions: SessionRow[];

ui/src/lib/format.ts

@@ -68,6 +68,12 @@ export function fmtSeconds(seconds: number | null | undefined): string {
     : fmtDuration(seconds * THOUSAND);
 }
 
+export function fmtCpu(percent: number | null | undefined): string {
+  return percent === null || percent === undefined
+    ? "–"
+    : `${Math.round(percent)}%`;
+}
+
 export function fmtBytes(bytes: number | null | undefined): string {
   if (bytes === null || bytes === undefined) {
     return "–";

ui/src/lib/panel/activity.svelte.ts

@@ -30,6 +30,8 @@ export interface Turn {
   // A tool call came between two pieces of text; the next piece starts a
   // paragraph, as the final message will show it.
   paused: boolean;
+  // What the model thought, when its thinking is reasoning and not progress.
+  reasoning: string;
   resultSubtype: string | null;
   roots: string[];
   says: string[];
@@ -223,27 +225,47 @@ export class ActivityModel {
     const turn = this.turnFor(turnId, ts, parent);
     const sdk = raw as Record<string, unknown>;
     if (sdk.type === "content_block_start") {
-      const block = sdk.content_block as Record<string, unknown> | undefined;
+      this.onBlockStart(turn, sdk.content_block, parent, ts);
+    } else if (sdk.type === "content_block_delta" && parent === null) {
+      this.onDelta(turn, sdk.delta as Record<string, unknown> | undefined);
+    }
+  }
+
+  private onBlockStart(
+    turn: Turn,
+    raw: unknown,
+    parent: string | null,
+    ts: string
+  ): void {
+    const block = raw as Record<string, unknown> | undefined;
     if (block?.type === "tool_use" && typeof block.id === "string") {
       this.ensureNode(turn, block.id, str(block.name) ?? "?", parent, ts);
     } else if (block?.type === "thinking" && parent === null) {
       turn.thinking += 1;
+      if (turn.reasoning) {
+        turn.reasoning += "\n\n";
       }
+    }
+  }
+
+  private onDelta(
+    turn: Turn,
+    delta: Record<string, unknown> | undefined
+  ): void {
+    const thought = delta?.type === "thinking_delta" ? delta.thinking : null;
+    if (
+      typeof thought === "string" &&
+      this.conversation?.thinking_is_progress !== true
+    ) {
+      turn.reasoning += thought;
       return;
     }
-    if (sdk.type === "content_block_delta" && parent === null) {
+    const text = thought ?? delta?.text;
-      const delta = sdk.delta as Record<string, unknown> | undefined;
-      const progress = this.conversation?.thinking_is_progress === true;
-      const text =
-        delta?.type === "thinking_delta" && progress
-          ? delta.thinking
-          : delta?.text;
     if (typeof text === "string" && text) {
       turn.text = joinText(turn.text, text, turn.paused);
       turn.paused = false;
     }
   }
-  }
 
   private onTool({ event, ts, turnId, parent }: Cursor): void {
     if (!(turnId && typeof event.tool_use_id === "string")) {
@@ -365,6 +387,7 @@ export class ActivityModel {
       nodes: {},
       origin: origin ?? "?",
       paused: false,
+      reasoning: "",
       resultSubtype: null,
       roots: [],
       says: [],

ui/src/lib/panel/chat-view.svelte

@@ -6,12 +6,16 @@
   import ErrorNote from "$lib/components/error-note.svelte";
   import { clip, fmtDateTime, fmtTime } from "$lib/format";
   import { cn } from "$lib/utils";
-  import type { ActivityModel } from "./activity.svelte";
+  import type { ActivityModel, ToolNode } from "./activity.svelte";
-  import { isLive, summarizeInput, toolLabel } from "./activity.svelte";
+  import { isLive } from "./activity.svelte";
   import { cacheableHistory, historyKey } from "./history-cache";
   import { usePanelHost } from "./host";
   import Markdown from "./markdown.svelte";
   import QuestionCard from "./question-card.svelte";
+  import Reasoning from "./reasoning.svelte";
+  import SayBubble from "./say-bubble.svelte";
+  import ServiceLine from "./service-line.svelte";
+  import ToolNodeView from "./tool-node.svelte";
   import TurnCard from "./turn-card.svelte";
 
   let {
@@ -26,25 +30,42 @@
     refreshKey?: number;
   } = $props();
 
-  const RESULT_CLIP = 600;
+  interface Step {
-  // Markdown for the last few screens renders at once; the rest waits
+    block: ContentBlock;
-  // until scrolled near, so a long thread paints as fast as a short one.
+    eager: boolean;
-  const EAGER_MARKDOWN = 40;
+    key: string;
+    stampedAt: string | null;
+  }
+
+  type Row =
+    | { day: string; key: string; kind: "day" }
+    | { key: string; kind: "system"; text: string; ts: string | null }
+    | {
+        eager: boolean;
+        key: string;
+        kind: "user";
+        service: string | null;
+        texts: string[];
+        ts: string | null;
+      }
+    | { key: string; kind: "agent"; steps: Step[] };
+
+  const RESULT_CLIP = 20_000;
+  const RENDERED_AT_ONCE = 40;
   const host = usePanelHost();
-  const NEAR_BOTTOM_PX = 120;
+  const AT_BOTTOM_PX = 8;
   const TICK_MS = 1000;
+  const NO_NODES: Record<string, ToolNode> = {};
 
   let messages = $state<HistoryMessage[] | null>(null);
   let failure = $state<string | null>(null);
-  let showResults = $state(false);
   let loadedAt = $state(new Date(0).toISOString());
   let scroller = $state<HTMLDivElement | null>(null);
   let body = $state<HTMLDivElement | null>(null);
-  const SETTLE_MS = 2500;
-  const SETTLE_STEP_MS = 120;
-  let settleUntil = 0;
   let now = $state(Date.now());
   let pinned = true;
+  let readerRow: { node: Element; top: number } | null = null;
+  let ownScroll = false;
 
   const tail = $derived(
     model.turns
@@ -53,7 +74,11 @@
   );
   const tailSize = $derived(
     tail.reduce(
-      (n, turn) => n + turn.text.length + Object.keys(turn.nodes).length,
+      (n, turn) =>
+        n +
+        turn.text.length +
+        turn.reasoning.length +
+        Object.keys(turn.nodes).length,
       0
     )
   );
@@ -71,46 +96,61 @@
     try {
       ({ messages } = await client.history(conversationId));
       loadedAt = new Date().toISOString();
-      settle();
       host.cache?.set(historyKey(conversationId), cacheableHistory(messages));
     } catch (cause) {
       failure = cause instanceof Error ? cause.message : String(cause);
     }
   }
 
-  // The scroller is column-reverse: its origin is the bottom, scrollTop is
-  // zero there and goes negative upward, and the browser keeps the view at
-  // the bottom while content grows - no matter how late markdown lands.
-  function nearBottom(): boolean {
-    return !scroller || Math.abs(scroller.scrollTop) < NEAR_BOTTOM_PX;
-  }
-
   function toBottom() {
     if (scroller) {
       scroller.scrollTop = 0;
     }
   }
 
-  async function scrollToBottom() {
+  function topRow(): { node: Element; top: number } | null {
-    await tick();
+    if (!(scroller && body)) {
-    toBottom();
+      return null;
+    }
+    const edge = scroller.getBoundingClientRect().top;
+    const rows = body.children;
+    let low = 0;
+    let high = rows.length - 1;
+    while (low < high) {
+      const middle = Math.floor((low + high) / 2);
+      if (rows[middle].getBoundingClientRect().bottom > edge) {
+        high = middle;
+      } else {
+        low = middle + 1;
+      }
+    }
+    const node = rows[low];
+    return node ? { node, top: node.getBoundingClientRect().top } : null;
   }
 
-  // A fresh thread keeps growing after it is on screen: markdown renders
+  function trackReader() {
-  // late, embeds load, fonts land. Hold the bottom for a while after a load.
+    if (ownScroll) {
-  function settle() {
+      ownScroll = false;
-    settleUntil = Date.now() + SETTLE_MS;
-    const step = () => {
-      if (!pinned || Date.now() > settleUntil) {
       return;
     }
+    pinned = !scroller || Math.abs(scroller.scrollTop) < AT_BOTTOM_PX;
+    readerRow = pinned ? null : topRow();
+  }
+
+  function keepReaderRowInPlace() {
+    if (pinned) {
       toBottom();
-      setTimeout(step, SETTLE_STEP_MS);
+      return;
-    };
+    }
-    step();
+    if (!(scroller && readerRow?.node.isConnected)) {
+      return;
+    }
+    const drift = readerRow.node.getBoundingClientRect().top - readerRow.top;
+    const before = scroller.scrollTop;
+    scroller.scrollTop += drift;
+    ownScroll = scroller.scrollTop !== before;
   }
 
-  // The date changes rarely; say it once, then only the time.
   function dayOf(iso: string | null | undefined): string {
     return iso ? iso.slice(0, 10) : "";
   }
@@ -121,7 +161,6 @@
 
   $effect(() => {
     if (refreshKey >= 0) {
-      pinned = true;
       untrack(() => load());
     }
   });
@@ -129,21 +168,15 @@
   $effect(() => {
     const count = (messages?.length ?? 0) + tailSize;
     if (pinned && count >= 0) {
-      scrollToBottom();
+      tick().then(toBottom);
     }
   });
 
-  // Markdown lands asynchronously (Obsidian renders after the DOM exists),
-  // so follow the content's height, not just the message count.
   $effect(() => {
     if (!(scroller && body)) {
       return;
     }
-    const observer = new ResizeObserver(() => {
+    const observer = new ResizeObserver(keepReaderRowInPlace);
-      if (pinned && scroller) {
-        scroller.scrollTop = scroller.scrollHeight;
-      }
-    });
     observer.observe(body);
     return () => observer.disconnect();
   });
@@ -157,36 +190,13 @@
     return () => clearInterval(timer);
   });
 
-  // Text the gateway or the CLI put in the user's seat: an inject header,
-  // an envelope, a subagent's report.
   const SYSTEM_HEAD = /^(\[[^\]\n]+\]|<task-notification>)/;
   const SECONDS = /:\d{2}$/;
   const DAY_TIME = /,?\s*\d{2}:\d{2}$/;
-  let openSystem = $state<Set<number>>(new Set());
 
-  function systemText(message: HistoryMessage): string | null {
-    if (message.role !== "user" || typeof message.content !== "string") {
-      return null;
-    }
-    return SYSTEM_HEAD.test(message.content.trimStart())
-      ? message.content
-      : null;
-  }
-
-  function toggleSystem(index: number) {
-    const next = new Set(openSystem);
-    if (next.has(index)) {
-      next.delete(index);
-    } else {
-      next.add(index);
-    }
-    openSystem = next;
-  }
-
-  // Keys count from the end: when the network copy grows the head past
-  // what the cache held, the tail keeps its nodes and its rendered markdown.
   function keyOf(message: HistoryMessage, index: number, total: number) {
-    return `${index - total}:${message.role}:${message.ts ?? ""}`;
+    const fromEnd = `${index - total}:${message.role}:${message.ts ?? ""}`;
+    return message.id ?? fromEnd;
   }
 
   function blocks(message: HistoryMessage): ContentBlock[] {
@@ -222,28 +232,127 @@
     }
     return "";
   }
+
+  const results = $derived.by(() => {
+    const found = new Map<string, { failed: boolean; text: string }>();
+    for (const message of messages ?? []) {
+      if (typeof message.content === "string") {
+        continue;
+      }
+      for (const block of message.content) {
+        if (block.type === "tool_result" && block.tool_use_id) {
+          found.set(block.tool_use_id, {
+            failed: block.is_error === true,
+            text: clip(resultText(block), RESULT_CLIP),
+          });
+        }
+      }
+    }
+    return found;
+  });
+
+  function nodeOf(block: ContentBlock): ToolNode {
+    const result = block.id ? results.get(block.id) : undefined;
+    let status: ToolNode["status"] = "aborted";
+    if (result) {
+      status = result.failed ? "error" : "done";
+    }
+    return {
+      children: [],
+      endedAt: null,
+      id: block.id ?? "",
+      input: block.input ?? null,
+      name: block.name ?? "?",
+      parent: null,
+      result: result?.text ?? "",
+      startedAt: "",
+      status,
+    };
+  }
+
+  function said(block: ContentBlock): string | null {
+    const text = (block.input as { text?: unknown } | null | undefined)?.text;
+    return block.name?.endsWith("__say") && typeof text === "string"
+      ? text
+      : null;
+  }
+
+  function userRow(
+    message: HistoryMessage,
+    parts: ContentBlock[],
+    key: string,
+    eager: boolean
+  ): Row {
+    const ts = message.ts ?? null;
+    const texts = parts.flatMap((b) =>
+      b.type === "text" && b.text ? [b.text] : []
+    );
+    if (!message.service && SYSTEM_HEAD.test(texts[0]?.trimStart() ?? "")) {
+      return { key, kind: "system", text: texts.join("\n"), ts };
+    }
+    const service = message.service ?? null;
+    return { eager, key, kind: "user", service, texts, ts };
+  }
+
+  function stepsOf(
+    message: HistoryMessage,
+    parts: ContentBlock[],
+    key: string,
+    eager: boolean,
+    minute: string
+  ): Step[] {
+    const ts = message.ts ?? null;
+    const stamped =
+      minuteOf(ts) !== minute ||
+      parts.some((b) => b.type === "text" && Boolean(b.text));
+    return parts.map((block, at) => ({
+      block,
+      eager,
+      key: `${key}:${at}`,
+      stampedAt: stamped && at === 0 ? ts : null,
+    }));
+  }
+
+  const rows = $derived.by(() => {
+    const out: Row[] = [];
+    const list = messages ?? [];
+    let run: Step[] | null = null;
+    let day = "";
+    let minute = "";
+    for (const [index, message] of list.entries()) {
+      const parts = blocks(message);
+      if (parts.every((b) => b.type === "tool_result")) {
+        continue;
+      }
+      const key = keyOf(message, index, list.length);
+      const eager = index >= list.length - RENDERED_AT_ONCE;
+      if (message.ts && dayOf(message.ts) !== day) {
+        day = dayOf(message.ts);
+        const label = fmtDateTime(message.ts).replace(DAY_TIME, "");
+        out.push({ day: label, key, kind: "day" });
+        run = null;
+      }
+      if (message.role === "user") {
+        out.push(userRow(message, parts, key, eager));
+        run = null;
+      } else if (run === null) {
+        run = stepsOf(message, parts, key, eager, minute);
+        out.push({ key, kind: "agent", steps: run });
+      } else {
+        run.push(...stepsOf(message, parts, key, eager, minute));
+      }
+      minute = message.ts ? minuteOf(message.ts) : minute;
+    }
+    return out;
+  });
 </script>
 
 <div
   class="flex min-h-0 flex-1 flex-col-reverse overflow-y-auto overflow-x-hidden px-3 py-3 [overflow-anchor:none] @md:px-6"
-  onscroll={() => {
+  onscroll={trackReader}
-    if (Date.now() > settleUntil) {
-      pinned = nearBottom();
-    }
-  }}
   bind:this={scroller}
 >
   <div class="flex min-w-0 max-w-full flex-col gap-3" bind:this={body}>
-    <button
-      class="rule-word self-end text-xs"
-      data-active={showResults}
-      onclick={() => {
-        showResults = !showResults;
-      }}
-      type="button"
-    >
-      {showResults ? "hide tool results" : "show tool results"}
-    </button>
     {#if failure}
       <ErrorNote message={failure} retry={load} />
     {:else if messages === null}
@@ -256,97 +365,72 @@
         title="Empty conversation"
       />
     {:else}
-      {#each messages as message, index (keyOf(message, index, messages.length))}
+      {#each rows as row (`${row.kind}:${row.key}`)}
-        {@const parts = blocks(message)}
+        {#if row.kind === "day"}
-        {@const isResultOnly = parts.every((b) => b.type === "tool_result")}
+          <p class="label-quiet self-center pt-2">{row.day}</p>
-        {@const system = systemText(message)}
+        {:else if row.kind === "system"}
-        {@const newDay =
-          message.ts && dayOf(message.ts) !== dayOf(messages[index - 1]?.ts)}
-        {@const newMinute =
-          message.ts &&
-          minuteOf(message.ts) !== minuteOf(messages[index - 1]?.ts)}
-        {@const spoken =
-          message.role === "user" ||
-          parts.some((b) => b.type === "text" && Boolean(b.text))}
-        {#if newDay}
-          <p class="label-quiet self-center pt-2">
-            {fmtDateTime(message.ts).replace(DAY_TIME, "")}
-          </p>
-        {/if}
-        {#if system}
           <div class="flex min-w-0 items-start justify-center gap-2">
-            {#if message.ts}
+            {#if row.ts}
               <span
                 class="tabular shrink-0 py-1 text-[11px] text-muted-foreground opacity-60"
-                title={fmtDateTime(message.ts)}
+                title={fmtDateTime(row.ts)}
               >
-                {minuteOf(message.ts)}
+                {minuteOf(row.ts)}
               </span>
             {/if}
-            <button
+            <ServiceLine text={row.text} />
-              aria-expanded={openSystem.has(index)}
-              class="@md:max-w-[75ch] min-w-0 max-w-full rounded-md px-2 py-1 text-left font-mono text-muted-foreground text-xs hover:bg-accent"
-              onclick={() => toggleSystem(index)}
-              type="button"
-            >
-              {#if openSystem.has(index)}
-                <span class="whitespace-pre-wrap break-words">{system}</span>
-              {:else}
-                <span class="block truncate"
-                  >{clip(system.split("\n")[0], 120)}</span
-                >
-              {/if}
-            </button>
           </div>
-        {:else if parts.length > 0 && !(isResultOnly && !showResults)}
+        {:else if row.kind === "user"}
-          <div
+          <div class="group flex min-w-0 max-w-full flex-col items-end gap-1.5">
-            class={cn(
+            {#if row.ts}
-            "group flex min-w-0 max-w-full flex-col gap-1.5",
-            message.role === "user" && !isResultOnly && "items-end"
-          )}
-          >
-            {#if message.ts && (newMinute || spoken) && !isResultOnly}
               <span
                 class="tabular px-1 text-[11px] text-muted-foreground opacity-60 transition-opacity group-hover:opacity-100"
-                title={fmtDateTime(message.ts)}
+                title={fmtDateTime(row.ts)}
               >
-                {minuteOf(message.ts)}
+                {minuteOf(row.ts)}
+              </span>
+            {/if}
+            {#each row.texts as text, index (index)}
+              <Markdown
+                class="min-w-0 @md:max-w-[75ch] max-w-full rounded-2xl rounded-br-md bg-primary/10 px-3.5 py-2"
+                eager={row.eager}
+                inert
+                {text}
+              />
+            {/each}
+            {#if row.service}
+              <ServiceLine text={row.service} />
+            {/if}
+          </div>
+        {:else}
+          <div class="group flex min-w-0 max-w-full flex-col">
+            {#each row.steps as step (step.key)}
+              {@const block = step.block}
+              {#if step.stampedAt}
+                <span
+                  class="tabular px-1 pt-1.5 text-[11px] text-muted-foreground opacity-60 transition-opacity group-hover:opacity-100"
+                  title={fmtDateTime(step.stampedAt)}
+                >
+                  {minuteOf(step.stampedAt)}
                 </span>
               {/if}
-            {#each parts as block, blockIndex (blockIndex)}
               {#if block.type === "text" && block.text}
                 <Markdown
-                  class={cn(
+                  class="min-w-0 @md:max-w-[75ch] max-w-full px-1 py-1"
-                    "min-w-0 @md:max-w-[75ch] max-w-full",
+                  eager={step.eager}
-                    message.role === "user"
-                      ? "rounded-2xl rounded-br-md bg-primary/10 px-3.5 py-2"
-                      : "px-1 py-1"
-                  )}
-                  eager={index >= messages.length - EAGER_MARKDOWN}
                   text={block.text}
                 />
               {:else if block.type === "tool_use"}
-                <p
+                {@const spoken = said(block)}
-                  class="flex min-w-0 max-w-full items-baseline gap-2 px-1 text-xs"
+                {#if spoken}
-                >
+                  <div class="py-1"><SayBubble text={spoken} /></div>
-                  <span class="shrink-0 font-medium"
+                {:else}
-                    >{toolLabel(block.name ?? "?")}</span
+                  <ToolNodeView node={nodeOf(block)} nodes={NO_NODES} now={0} />
-                  >
+                {/if}
-                  <span class="min-w-0 truncate text-muted-foreground">
+              {:else if block.type === "thinking" && block.thinking?.trim()}
-                    {clip(summarizeInput(block.name ?? "", block.input), 160)}
+                <Reasoning text={block.thinking} />
-                  </span>
-                </p>
-              {:else if block.type === "tool_result" && showResults}
-                <pre
-                  class={cn(
-                  "max-h-48 max-w-full overflow-auto whitespace-pre-wrap break-all rounded-md p-2 text-xs",
-                  block.is_error
-                    ? "bg-destructive/8 text-destructive"
-                    : "bg-muted/40"
-                )}
-                >{clip(resultText(block), RESULT_CLIP)}</pre>
               {:else if block.type === "thinking"}
-                <p class="px-1 text-kind-deep text-xs">thinking</p>
+                <p class="px-1.5 py-1 text-kind-deep text-xs">thinking</p>
               {/if}
             {/each}
           </div>

ui/src/lib/panel/fences.ts

@@ -0,0 +1,18 @@
+const FENCE_HEAD =
+  /^((?:\s*(?:[-+*]|\d+[.)])\s+|\s*>)*\s*)(`{3,}|~{3,})[ \t]*([^\s`]+)(.*)$/gm;
+
+export function inertFences(
+  text: string,
+  runs: (language: string) => boolean
+): string {
+  return text.replace(
+    FENCE_HEAD,
+    (
+      line: string,
+      lead: string,
+      fence: string,
+      language: string,
+      rest: string
+    ) => (runs(language.toLowerCase()) ? `${lead}${fence}text${rest}` : line)
+  );
+}

ui/src/lib/panel/host.ts

@@ -11,7 +11,11 @@ export interface PanelHost {
   // Where the index and the last threads persist between opens.
   cache?: PanelCache;
   // Renders ``text`` into ``node``; returns the cleanup. Absent: marked + DOMPurify.
-  markdown?: (node: HTMLElement, text: string) => (() => void) | undefined;
+  markdown?: (
+    node: HTMLElement,
+    text: string,
+    options?: { inert?: boolean }
+  ) => (() => void) | undefined;
   name: "browser" | "obsidian";
   openLink: (target: string, kind: LinkKind) => void;
   // Opens the note a conversation lives in (its markdown binding).

ui/src/lib/panel/markdown.svelte

@@ -7,7 +7,13 @@
     text,
     class: className = "",
     eager = true,
-  }: { text: string; class?: string; eager?: boolean } = $props();
+    inert = false,
+  }: {
+    text: string;
+    class?: string;
+    eager?: boolean;
+    inert?: boolean;
+  } = $props();
 
   const NEAR = "1200px";
 
@@ -50,7 +56,7 @@
     const now = (next: string) => {
       dispose?.();
       node.classList.remove("whitespace-pre-wrap");
-      dispose = host.markdown?.(node, next);
+      dispose = host.markdown?.(node, next, { inert });
     };
     const later = (next: string) => {
       pending = next;

ui/src/lib/panel/reasoning.svelte

@@ -0,0 +1,49 @@
+<script lang="ts">
+  import ChevronRightIcon from "@lucide/svelte/icons/chevron-right";
+  import { cn } from "$lib/utils";
+
+  let { text, live = false }: { text: string; live?: boolean } = $props();
+
+  const PREVIEW = 400;
+  const SPACES = /\s+/g;
+  let expanded = $state(false);
+  const flat = $derived(text.replace(SPACES, " ").trim());
+</script>
+
+<div class="flex min-w-0 max-w-full flex-col">
+  <button
+    aria-expanded={expanded}
+    class="row-hover ledger-grid grid-cols-[auto_auto_minmax(0,1fr)] rounded-md px-1.5 py-1 text-left text-sm"
+    onclick={() => {
+      expanded = !expanded;
+    }}
+    type="button"
+  >
+    <ChevronRightIcon
+      class={cn(
+        "size-3.5 text-icon transition-transform duration-150",
+        expanded && "rotate-90"
+      )}
+    />
+    <span class="size-2 rounded-full bg-kind-deep"></span>
+    <span class="flex min-w-0 items-baseline gap-2">
+      <span class="shrink-0 font-medium text-kind-deep">reasoning</span>
+      {#if live && !expanded}
+        <span class="truncate text-left text-muted-foreground" dir="rtl">
+          <bdi dir="ltr">{flat.slice(-PREVIEW)}</bdi>
+        </span>
+      {:else if !expanded}
+        <span class="truncate text-muted-foreground"
+          >{flat.slice(0, PREVIEW)}</span
+        >
+      {/if}
+    </span>
+  </button>
+  {#if expanded}
+    <p
+      class="mb-1 ml-7 @md:max-w-[75ch] whitespace-pre-wrap break-words text-muted-foreground text-sm"
+    >
+      {text.trim()}
+    </p>
+  {/if}
+</div>

ui/src/lib/panel/say-bubble.svelte

@@ -0,0 +1,11 @@
+<script lang="ts">
+  import MessageSquareIcon from "@lucide/svelte/icons/message-square";
+  import Markdown from "./markdown.svelte";
+
+  let { text }: { text: string } = $props();
+</script>
+
+<div class="mx-1 flex gap-2 rounded-md bg-primary/8 px-2.5 py-1.5">
+  <MessageSquareIcon class="mt-1 size-3.5 shrink-0 text-link" />
+  <Markdown class="min-w-0 flex-1" {text} />
+</div>

ui/src/lib/panel/service-line.svelte

@@ -0,0 +1,28 @@
+<script lang="ts">
+  import { clip } from "$lib/format";
+  import { cn } from "$lib/utils";
+
+  let { text, class: className = "" }: { text: string; class?: string } =
+    $props();
+
+  const HEAD_CLIP = 120;
+  let expanded = $state(false);
+</script>
+
+<button
+  aria-expanded={expanded}
+  class={cn(
+    "min-w-0 @md:max-w-[75ch] max-w-full rounded-md px-2 py-1 text-left font-mono text-muted-foreground text-xs hover:bg-accent",
+    className
+  )}
+  onclick={() => {
+    expanded = !expanded;
+  }}
+  type="button"
+>
+  {#if expanded}
+    <span class="whitespace-pre-wrap break-words">{text}</span>
+  {:else}
+    <span class="block truncate">{clip(text.split("\n")[0], HEAD_CLIP)}</span>
+  {/if}
+</button>

ui/src/lib/panel/tool-node.svelte

@@ -33,6 +33,11 @@
     running: "bg-signal animate-pulse-dot",
   };
   const SHOW_DURATION_AFTER_MS = 2000;
+  const timed = $derived(
+    node.status === "running"
+      ? duration >= SHOW_DURATION_AFTER_MS
+      : node.endedAt !== null
+  );
 </script>
 
 <div class={cn("flex flex-col", depth > 0 && "ml-3 border-l pl-2")}>
@@ -59,7 +64,7 @@
         <span class="truncate text-muted-foreground">{summary}</span>
       {/if}
     </span>
-    {#if node.status !== "running" || duration >= SHOW_DURATION_AFTER_MS}
+    {#if timed}
       <span class="tabular text-muted-foreground text-xs">
         {fmtDuration(duration)}
       </span>

ui/src/lib/panel/turn-card.svelte

@@ -1,5 +1,4 @@
 <script lang="ts">
-  import MessageSquareIcon from "@lucide/svelte/icons/message-square";
   import StatusPill from "$lib/components/status-pill.svelte";
   import {
     elapsedMs,
@@ -11,6 +10,8 @@
   import { cn } from "$lib/utils";
   import { isLive, ORIGIN_LABELS, type Turn } from "./activity.svelte";
   import Markdown from "./markdown.svelte";
+  import Reasoning from "./reasoning.svelte";
+  import SayBubble from "./say-bubble.svelte";
   import ToolNodeView from "./tool-node.svelte";
 
   let { turn, now }: { turn: Turn; now: number } = $props();
@@ -59,7 +60,7 @@
         tool {toolCount === 1 ? "call" : "calls"}
       </span>
     {/if}
-    {#if turn.thinking > 0 && turn.status === "running"}
+    {#if turn.thinking > 0 && turn.status === "running" && !turn.reasoning}
       <span class="text-kind-deep">thinking…</span>
     {/if}
     {#if turn.usage}
@@ -79,9 +80,13 @@
   {:else if turn.userText}
     <Markdown
       class="mx-1 rounded-md bg-muted/50 px-2.5 py-1.5"
+      inert
       text={turn.userText}
     />
   {/if}
+  {#if turn.reasoning.trim()}
+    <Reasoning live={turn.status === "running"} text={turn.reasoning} />
+  {/if}
   {#if turn.roots.length > 0}
     <div class="flex flex-col">
       {#each turn.roots as rootId (rootId)}
@@ -92,10 +97,7 @@
     </div>
   {/if}
   {#each turn.says as text, index (index)}
-    <div class="mx-1 flex gap-2 rounded-md bg-primary/8 px-2.5 py-1.5">
+    <SayBubble {text} />
-      <MessageSquareIcon class="mt-1 size-3.5 shrink-0 text-link" />
-      <Markdown class="min-w-0 flex-1" {text} />
-    </div>
   {/each}
   {#if turn.text}
     <Markdown class="mx-1 px-1" text={turn.text} />

ui/src/lib/system/process-table.svelte

@@ -0,0 +1,68 @@
+<script lang="ts">
+  import type { ProcessRow } from "$lib/api/types";
+  import { Button } from "$lib/components/ui/button";
+  import { fmtBytes, fmtCpu, fmtSeconds } from "$lib/format";
+
+  let {
+    rows,
+    onKill,
+  }: { rows: ProcessRow[]; onKill: (row: ProcessRow) => void } = $props();
+
+  const INDENT_REM = 0.875;
+</script>
+
+<div class="overflow-x-auto">
+  <table class="w-full text-sm">
+    <thead class="text-muted-foreground text-xs">
+      <tr class="border-b text-left">
+        <th class="py-1.5 pr-3 font-medium">pid</th>
+        <th class="w-full py-1.5 pr-3 font-medium">command</th>
+        <th class="py-1.5 pr-3 text-right font-medium">cpu</th>
+        <th class="py-1.5 pr-3 text-right font-medium">rss</th>
+        <th class="hidden py-1.5 pr-3 text-right font-medium sm:table-cell">
+          age
+        </th>
+        <th class="py-1.5"><span class="sr-only">actions</span></th>
+      </tr>
+    </thead>
+    <tbody>
+      {#each rows as row (row.pid)}
+        <tr class="border-b last:border-b-0">
+          <td class="tabular py-1 pr-3 text-muted-foreground text-xs">
+            {row.pid}
+          </td>
+          <td class="max-w-0 py-1 pr-3">
+            <span
+              class="block truncate font-mono text-xs"
+              title={row.command}
+              style:padding-left="{row.depth * INDENT_REM}rem"
+            >
+              {row.command || row.name}
+            </span>
+          </td>
+          <td class="tabular py-1 pr-3 text-right text-xs">
+            {fmtCpu(row.cpu)}
+          </td>
+          <td class="tabular whitespace-nowrap py-1 pr-3 text-right text-xs">
+            {fmtBytes(row.rss)}
+          </td>
+          <td
+            class="tabular hidden whitespace-nowrap py-1 pr-3 text-right text-muted-foreground text-xs sm:table-cell"
+          >
+            {fmtSeconds(row.age_seconds)}
+          </td>
+          <td class="py-0.5 text-right">
+            <Button
+              class="text-muted-foreground hover:text-destructive max-sm:h-10"
+              onclick={() => onKill(row)}
+              size="xs"
+              variant="ghost"
+            >
+              Kill
+            </Button>
+          </td>
+        </tr>
+      {/each}
+    </tbody>
+  </table>
+</div>

ui/src/lib/system/session-detail.svelte

@@ -0,0 +1,150 @@
+<script lang="ts">
+  import { onMount, untrack } from "svelte";
+  import { base } from "$app/paths";
+  import type { ApiClient } from "$lib/api/client";
+  import type { ProcessRow, SessionRow } from "$lib/api/types";
+  import { Button } from "$lib/components/ui/button";
+  import { shortId } from "$lib/format";
+  import { ConversationFeed } from "$lib/panel/conversation.svelte";
+  import TurnCard from "$lib/panel/turn-card.svelte";
+  import ProcessTable from "./process-table.svelte";
+
+  let {
+    client,
+    row,
+    busy,
+    note,
+    onInterrupt,
+    onClose,
+    onKill,
+  }: {
+    client: ApiClient;
+    row: SessionRow;
+    busy: boolean;
+    note: string;
+    onInterrupt: (row: SessionRow) => void;
+    onClose: (row: SessionRow) => void;
+    onKill: (process: ProcessRow) => void;
+  } = $props();
+
+  const TICK_MS = 1000;
+  const feed = new ConversationFeed(
+    () => client,
+    untrack(() => row.key)
+  );
+  let stderr = $state<string[] | null>(null);
+  let now = $state(Date.now());
+
+  const turn = $derived(feed.model.running);
+
+  onMount(() => {
+    feed.start();
+    const timer = setInterval(() => {
+      now = Date.now();
+    }, TICK_MS);
+    return () => {
+      feed.stop();
+      clearInterval(timer);
+    };
+  });
+
+  $effect(() => {
+    const { key, idle_seconds: polled } = row;
+    if (polled >= 0) {
+      client
+        .sessionStderr(key)
+        .then((tail) => {
+          stderr = tail.lines;
+        })
+        .catch(() => undefined);
+    }
+  });
+</script>
+
+<div class="flex flex-col gap-4 px-3 pt-2 pb-4">
+  <div class="flex flex-wrap items-center gap-x-4 gap-y-2">
+    <p class="tabular min-w-0 flex-1 text-muted-foreground text-xs">
+      session
+      {shortId(row.session_id)}
+      {#if row.pid}
+        · pid {row.pid}
+      {/if}
+      {#if row.pending > 0}
+        · {row.pending}
+        buffered
+      {/if}
+    </p>
+    <div class="flex flex-wrap items-center gap-2">
+      {#if note}
+        <span class="text-muted-foreground text-xs" role="status">{note}</span>
+      {/if}
+      {#if !feed.error}
+        <Button
+          class="max-sm:h-10"
+          href="{base}/conversations/{row.key}"
+          size="sm"
+          variant="ghost"
+        >
+          Open thread
+        </Button>
+      {/if}
+      <Button
+        class="max-sm:h-10"
+        disabled={busy || !row.busy}
+        onclick={() => onInterrupt(row)}
+        size="sm"
+        variant="outline"
+      >
+        Interrupt turn
+      </Button>
+      <Button
+        class="max-sm:h-10"
+        disabled={busy}
+        onclick={() => onClose(row)}
+        size="sm"
+        variant="destructive"
+      >
+        Close session
+      </Button>
+    </div>
+  </div>
+
+  <section class="flex flex-col gap-1">
+    <h4 class="label-quiet">Now</h4>
+    {#if turn}
+      <TurnCard {now} {turn} />
+    {:else}
+      <p class="text-muted-foreground text-sm">
+        {row.busy
+          ? "A turn is running; its events have not reached this page yet."
+          : "Nothing in flight."}
+      </p>
+    {/if}
+  </section>
+
+  <section class="flex flex-col gap-1">
+    <h4 class="label-quiet">Process tree</h4>
+    {#if row.processes.length === 0}
+      <p class="text-muted-foreground text-sm">
+        The process is not visible to the gateway.
+      </p>
+    {:else}
+      <ProcessTable {onKill} rows={row.processes} />
+    {/if}
+  </section>
+
+  <section class="flex flex-col gap-1">
+    <h4 class="label-quiet">stderr</h4>
+    {#if stderr?.length === 0}
+      <p class="text-muted-foreground text-sm">
+        Nothing on stderr since this process started.
+      </p>
+    {:else if stderr}
+      <pre
+        class="max-h-64 overflow-auto whitespace-pre-wrap break-all rounded-md bg-muted/40 p-2 text-xs"
+      >{stderr.join(
+          "\n"
+        )}</pre>
+    {/if}
+  </section>
+</div>

ui/src/routes/system/+page.svelte

@@ -1,16 +1,39 @@
 <script lang="ts">
+  import ChevronRightIcon from "@lucide/svelte/icons/chevron-right";
   import { onMount } from "svelte";
-  import { base } from "$app/paths";
+  import type {
-  import type { SessionsResponse } from "$lib/api/types";
+    ProcessRow,
+    SessionRow,
+    SessionsResponse,
+  } from "$lib/api/types";
   import ErrorNote from "$lib/components/error-note.svelte";
-  import { fmtBytes, fmtSeconds, shortId } from "$lib/format";
+  import { Button } from "$lib/components/ui/button";
+  import * as Dialog from "$lib/components/ui/dialog";
+  import { fmtBytes, fmtCpu, fmtSeconds, shortId } from "$lib/format";
+  import { gateway } from "$lib/gateway.svelte";
   import { session } from "$lib/session.svelte";
   import KindMark from "$lib/shell/kind-mark.svelte";
+  import ProcessTable from "$lib/system/process-table.svelte";
+  import SessionDetail from "$lib/system/session-detail.svelte";
   import { cn } from "$lib/utils";
 
-  const POLL_MS = 10_000;
+  interface Order {
+    confirm: string;
+    lines: string[];
+    run: () => Promise<unknown>;
+    title: string;
+  }
+
+  const POLL_MS = 3000;
+  const SECOND_LOOK_FOR_CPU_MS = 1000;
+  const COLUMNS = 8;
   let sessions = $state<SessionsResponse | null>(null);
   let failure = $state<string | null>(null);
+  let unfolded = $state<Set<string>>(new Set());
+  let order = $state<Order | null>(null);
+  let orderFailure = $state<string | null>(null);
+  let notes = $state<Record<string, string>>({});
+  let busy = $state(false);
 
   async function load() {
     const { client } = session;
@@ -25,66 +48,114 @@
     }
   }
 
+  function toggle(key: string) {
+    const next = new Set(unfolded);
+    if (!next.delete(key)) {
+      next.add(key);
+    }
+    unfolded = next;
+  }
+
+  function ask(next: Order) {
+    orderFailure = null;
+    order = next;
+  }
+
+  async function carryOut(pending: Order) {
+    busy = true;
+    try {
+      await pending.run();
+      order = null;
+      await load();
+    } catch (cause) {
+      orderFailure = cause instanceof Error ? cause.message : String(cause);
+    } finally {
+      busy = false;
+    }
+  }
+
+  async function interrupt(row: SessionRow) {
+    const { client } = session;
+    if (!client) {
+      return;
+    }
+    busy = true;
+    try {
+      const { interrupted } = await client.interruptSession(row.key);
+      notes = {
+        ...notes,
+        [row.key]: interrupted ? "" : "Nothing was running.",
+      };
+      await load();
+    } catch (cause) {
+      const message = cause instanceof Error ? cause.message : String(cause);
+      notes = { ...notes, [row.key]: message };
+    } finally {
+      busy = false;
+    }
+  }
+
+  function askClose(row: SessionRow) {
+    const { client } = session;
+    if (!client) {
+      return;
+    }
+    const lines = [
+      "The claude process exits. The conversation stays and resumes from its transcript on the next message.",
+    ];
+    if (row.busy) {
+      lines.push("A turn is running: it is cut and its reply is lost.");
+    }
+    if (row.pinned) {
+      lines.push("This session is pinned: the gateway never closes it itself.");
+    }
+    ask({
+      confirm: "Close session",
+      lines,
+      run: () => client.closeSession(row.key),
+      title: `Close the ${row.kind} session?`,
+    });
+  }
+
+  function askKill(process: ProcessRow) {
+    const { client } = session;
+    if (!client) {
+      return;
+    }
+    const owner = sessions?.sessions.find((row) => row.pid === process.pid);
+    const lines = [
+      `SIGKILL to ${process.name} and everything it started. Nothing gets to clean up.`,
+    ];
+    if (owner) {
+      lines.push(
+        "It is a session's claude: the session is dropped, and the conversation resumes from its transcript on the next message."
+      );
+    }
+    ask({
+      confirm: "Kill",
+      lines,
+      run: () => client.killProcess(process.pid),
+      title: `Kill process ${process.pid}?`,
+    });
+  }
+
+  const titles = $derived(
+    new Map(gateway.conversations.map((row) => [row.id, row.title]))
+  );
+
   onMount(() => {
     load();
+    const second = setTimeout(load, SECOND_LOOK_FOR_CPU_MS);
     const poll = setInterval(load, POLL_MS);
-    return () => clearInterval(poll);
+    return () => {
+      clearTimeout(second);
+      clearInterval(poll);
+    };
   });
 </script>
 
-<section class="flex flex-col gap-3">
+{#snippet state(s: SessionRow)}
-  <div class="flex items-baseline gap-3">
+  <span class={cn(s.busy ? "text-signal" : "text-muted-foreground")}>
-    <h2 class="font-medium text-sm">Live claude processes</h2>
-    {#if sessions}
-      <span class="tabular text-muted-foreground text-xs">
-        {sessions.sessions.length}
-        · {fmtBytes(sessions.rss)}
-        {#if sessions.rss_limit}
-          of {fmtBytes(sessions.rss_limit)}
-        {/if}
-      </span>
-    {/if}
-  </div>
-  {#if failure}
-    <ErrorNote message={failure} retry={load} />
-  {:else if !sessions}
-    <p class="text-muted-foreground text-sm">Loading…</p>
-  {:else if sessions.sessions.length === 0}
-    <p class="text-muted-foreground text-sm">
-      No claude processes alive. Sessions spawn on the first turn and are reaped
-      by idle time or memory pressure.
-    </p>
-  {:else}
-    <div class="overflow-x-auto rounded-lg border bg-strip">
-      <table class="w-full text-sm">
-        <thead class="text-muted-foreground text-xs">
-          <tr class="border-b text-left">
-            <th class="px-3 py-2 font-medium">conversation</th>
-            <th class="px-3 py-2 font-medium">agent</th>
-            <th class="px-3 py-2 font-medium">state</th>
-            <th class="px-3 py-2 text-right font-medium">rss</th>
-            <th class="px-3 py-2 text-right font-medium">idle</th>
-            <th class="px-3 py-2 text-right font-medium">age</th>
-            <th class="px-3 py-2 text-right font-medium">turns</th>
-          </tr>
-        </thead>
-        <tbody>
-          {#each sessions.sessions as s (s.key)}
-            <tr class="row-hover border-b last:border-b-0">
-              <td class="px-3 py-1.5">
-                <a
-                  class="flex items-center gap-2 hover:underline"
-                  href="{base}/conversations/{s.key}"
-                >
-                  <KindMark kind={s.kind} />
-                  <span class="tabular text-xs">{shortId(s.key)}</span>
-                </a>
-              </td>
-              <td class="px-3 py-1.5">{s.agent}</td>
-              <td class="px-3 py-1.5 text-xs">
-                <span
-                  class={cn(s.busy ? "text-signal" : "text-muted-foreground")}
-                >
     {s.busy ? "busy" : "idle"}
   </span>
   {#if s.pinned}
@@ -96,19 +167,196 @@
   {#if s.pending_question}
     <span class="ml-1 text-attention-foreground">question</span>
   {/if}
+{/snippet}
+
+<div class="flex flex-wrap items-baseline gap-3">
+  <h2 class="font-medium text-sm">Live claude processes</h2>
+  {#if sessions}
+    <span class="tabular text-muted-foreground text-xs">
+      {sessions.sessions.length}
+      {sessions.sessions.length === 1 ? "session" : "sessions"}
+      · {fmtBytes(sessions.rss)}
+      {#if sessions.rss_limit}
+        of {fmtBytes(sessions.rss_limit)}
+      {/if}
+      · cpu {fmtCpu(sessions.cpu)}
+    </span>
+  {/if}
+</div>
+
+<div class="flex flex-col gap-6">
+  {#if failure}
+    <ErrorNote message={failure} retry={load} />
+  {:else if !sessions}
+    <p class="text-muted-foreground text-sm">Loading…</p>
+  {:else}
+    <section class="flex flex-col gap-2">
+      <h3 class="label-quiet">Sessions</h3>
+      {#if sessions.sessions.length === 0}
+        <p class="text-muted-foreground text-sm">
+          No claude processes alive. Sessions spawn on the first turn and are
+          reaped by idle time or memory pressure.
+        </p>
+      {:else}
+        <div class="overflow-x-auto rounded-lg border bg-strip">
+          <table class="w-full text-sm">
+            <thead class="text-muted-foreground text-xs">
+              <tr class="border-b text-left">
+                <th class="px-3 py-2 font-medium">conversation</th>
+                <th class="hidden px-3 py-2 font-medium sm:table-cell">
+                  agent
+                </th>
+                <th class="hidden px-3 py-2 font-medium sm:table-cell">
+                  state
+                </th>
+                <th class="px-3 py-2 text-right font-medium">cpu</th>
+                <th class="px-3 py-2 text-right font-medium">rss</th>
+                <th
+                  class="hidden px-3 py-2 text-right font-medium sm:table-cell"
+                >
+                  idle
+                </th>
+                <th
+                  class="hidden px-3 py-2 text-right font-medium sm:table-cell"
+                >
+                  age
+                </th>
+                <th
+                  class="hidden px-3 py-2 text-right font-medium sm:table-cell"
+                >
+                  turns
+                </th>
+              </tr>
+            </thead>
+            <tbody>
+              {#each sessions.sessions as s (s.key)}
+                {@const expanded = unfolded.has(s.key)}
+                <tr class={cn("border-b", !expanded && "last:border-b-0")}>
+                  <td class="max-w-0 px-1.5 py-1 sm:w-2/5">
+                    <button
+                      aria-expanded={expanded}
+                      class="row-hover flex max-w-full items-center gap-2 rounded-md px-1.5 py-1 text-left max-sm:min-h-10"
+                      onclick={() => toggle(s.key)}
+                      type="button"
+                    >
+                      <ChevronRightIcon
+                        class={cn(
+                          "size-3.5 text-icon transition-transform duration-150",
+                          expanded && "rotate-90"
+                        )}
+                      />
+                      <KindMark kind={s.kind} />
+                      <span class="flex min-w-0 flex-col">
+                        <span class="truncate font-medium">
+                          {titles.get(s.key) ?? shortId(s.key)}
+                        </span>
+                        <span class="text-xs sm:hidden">
+                          {@render state(s)}
+                        </span>
+                      </span>
+                    </button>
+                  </td>
+                  <td class="hidden px-3 py-1.5 sm:table-cell">{s.agent}</td>
+                  <td
+                    class="hidden whitespace-nowrap px-3 py-1.5 text-xs sm:table-cell"
+                  >
+                    {@render state(s)}
                   </td>
-              <td class="tabular px-3 py-1.5 text-right">{fmtBytes(s.rss)}</td>
                   <td class="tabular px-3 py-1.5 text-right">
+                    {fmtCpu(s.cpu)}
+                  </td>
+                  <td class="tabular whitespace-nowrap px-3 py-1.5 text-right">
+                    {fmtBytes(s.rss)}
+                  </td>
+                  <td
+                    class="tabular hidden px-3 py-1.5 text-right sm:table-cell"
+                  >
                     {fmtSeconds(s.idle_seconds)}
                   </td>
-              <td class="tabular px-3 py-1.5 text-right">
+                  <td
+                    class="tabular hidden px-3 py-1.5 text-right sm:table-cell"
+                  >
                     {fmtSeconds(s.age_seconds)}
                   </td>
-              <td class="tabular px-3 py-1.5 text-right">{s.turns}</td>
+                  <td
+                    class="tabular hidden px-3 py-1.5 text-right sm:table-cell"
+                  >
+                    {s.turns}
+                  </td>
                 </tr>
+                {#if expanded && session.client}
+                  <tr class="border-b last:border-b-0">
+                    <td class="bg-background/60" colspan={COLUMNS}>
+                      <SessionDetail
+                        {busy}
+                        client={session.client}
+                        note={notes[s.key] ?? ""}
+                        onClose={askClose}
+                        onInterrupt={interrupt}
+                        onKill={askKill}
+                        row={s}
+                      />
+                    </td>
+                  </tr>
+                {/if}
               {/each}
             </tbody>
           </table>
         </div>
       {/if}
-</section>
+    </section>
+
+    <section class="flex flex-col gap-2">
+      <h3 class="label-quiet">Outside any session</h3>
+      {#if sessions.others.length === 0}
+        <p class="text-muted-foreground text-sm">
+          Nothing else runs under the gateway.
+        </p>
+      {:else}
+        <ProcessTable onKill={askKill} rows={sessions.others} />
+      {/if}
+    </section>
+  {/if}
+</div>
+
+<Dialog.Root
+  onOpenChange={(next) => {
+    if (!next) {
+      order = null;
+    }
+  }}
+  open={order !== null}
+>
+  <Dialog.Content>
+    {#if order}
+      {@const pending = order}
+      <Dialog.Header>
+        <Dialog.Title>{pending.title}</Dialog.Title>
+        {#each pending.lines as line (line)}
+          <Dialog.Description>{line}</Dialog.Description>
+        {/each}
+        {#if orderFailure}
+          <p class="text-destructive text-sm" role="alert">{orderFailure}</p>
+        {/if}
+      </Dialog.Header>
+      <Dialog.Footer>
+        <Button
+          disabled={busy}
+          onclick={() => {
+            order = null;
+          }}
+          variant="ghost"
+        >
+          Cancel
+        </Button>
+        <Button
+          disabled={busy}
+          onclick={() => carryOut(pending)}
+          variant="destructive"
+        >
+          {pending.confirm}
+        </Button>
+      </Dialog.Footer>
+    {/if}
+  </Dialog.Content>
+</Dialog.Root>