feat(agents): Select, copy, quote and search the conversation

- Conversation text can be selected and copied.
- Selected text gets a Quote button that replies to it in the composer.
- Messages have Copy on hover; your own messages also have Edit and
  Resend and Send Again.
- Code blocks are highlighted and have a Copy button.
- File paths in replies (`src/lib.rs:12`) open in the editor when the
  file exists.
- Find in Conversation (⌘F / Ctrl+F) highlights every match and steps
  through them, opening collapsed tool output.
- Jump to Bottom appears after scrolling up.
- Your messages show when they were sent and how long the agent took;
  a running turn shows its elapsed time.

crates/ide-agent/src/lib.rs

@@ -232,7 +232,7 @@ impl AgentManager {
                     if matches!(f.task.status, AgentStatus::Running | AgentStatus::NeedsInput | AgentStatus::Starting) {
                         f.task.status = AgentStatus::Ready;
                         let mut timeline = Timeline::from_entries(std::mem::take(&mut f.entries));
-                        timeline.end_turn();
+                        timeline.end_turn(None);
                         f.entries = timeline.entries;
                     }
                     let task = Task::restore(f, shared.clone());
@@ -658,7 +658,7 @@ impl Task {
         loop {
             let result = self.turn(&prompt).await;
             tokio::time::sleep(TURN_GRACE).await;
-            let changed = self.state.lock().timeline.end_turn();
+            let changed = self.state.lock().timeline.end_turn(Some(now_ms()));
             self.mark_dirty(changed);
             let send_now = self.send_now.swap(false, Ordering::AcqRel);
             let next = {
@@ -702,7 +702,12 @@ impl Task {
             .map(|f| file_name(&f.0))
             .chain(prompt.images.iter().map(|i| i.name.clone().unwrap_or_else(|| "image".into())))
             .collect();
-        self.push_entry(AgentEntry::User { text: prompt.text.clone(), attachments });
+        self.push_entry(AgentEntry::User {
+            text: prompt.text.clone(),
+            attachments,
+            sent_ms: Some(now_ms()),
+            done_ms: None,
+        });
         // Launching the agent can take a while (`npx` fetches its adapter on first use).
         let starting = self.live.lock().as_ref().is_none_or(|l| l.peer.is_closed());
         self.set_status(if starting { AgentStatus::Starting } else { AgentStatus::Running }, None);

crates/ide-agent/src/model.rs

@@ -194,6 +194,12 @@ pub enum AgentEntry {
         text: String,
         /// Names of the files and images sent with it.
         attachments: Vec<String>,
+        /// When it was sent (ms since the epoch); `None` in tasks saved before this was kept.
+        #[serde(default)]
+        sent_ms: Option<f64>,
+        /// When the turn it started ended; `None` while it runs or when it was cut off.
+        #[serde(default)]
+        done_ms: Option<f64>,
     },
     Agent {
         text: String,

crates/ide-agent/src/tests.rs

@@ -238,10 +238,17 @@ async fn a_task_runs_asks_for_permission_and_survives_a_restart() {
             events.iter().any(|e| matches!(e, AgentEvent::Task { task } if task.status == AgentStatus::NeedsInput))
         );
         let last_entry = events.iter().rev().find_map(|e| match e {
-            AgentEvent::Entry { index, entry, .. } => Some((*index, entry.clone())),
+            AgentEvent::Entry { index, entry, .. } if !matches!(entry, AgentEntry::User { .. }) => {
+                Some((*index, entry.clone()))
+            }
             _ => None,
         });
         assert_eq!(last_entry, Some((4, AgentEntry::Agent { text: "chose yes".into() })));
+        // The turn's end is recorded on the message that started it.
+        assert!(events.iter().any(|e| matches!(
+            e,
+            AgentEvent::Entry { index: 0, entry: AgentEntry::User { sent_ms: Some(_), done_ms: Some(_), .. }, .. }
+        )));
     }
     let providers = mgr.providers();
     let claude = providers.iter().find(|p| p.id == "claude").unwrap();

crates/ide-agent/src/timeline.rs

@@ -166,11 +166,17 @@ impl Timeline {
         }
     }
 
-    /// Settles what an ended turn left open: running tools and pending permissions.
-    pub fn end_turn(&mut self) -> Vec<usize> {
+    /// Settles what an ended turn left open: running tools and pending permissions,
+    /// and records when the turn ended (`done`) on the message that started it.
+    pub fn end_turn(&mut self, done: Option<f64>) -> Vec<usize> {
         let mut changed = Vec::new();
+        let started = self.entries.iter().rposition(|e| matches!(e, AgentEntry::User { .. }));
         for (i, e) in self.entries.iter_mut().enumerate() {
             match e {
+                AgentEntry::User { done_ms, .. } if Some(i) == started && done.is_some() && done_ms.is_none() => {
+                    *done_ms = done;
+                    changed.push(i);
+                }
                 AgentEntry::Tool { status, .. }
                     if matches!(status, AgentToolStatus::Pending | AgentToolStatus::Running) =>
                 {
@@ -286,12 +292,27 @@ mod tests {
         assert_eq!(t.apply(&plan("completed")).changed, vec![0]);
         t.apply(&json!({"sessionUpdate": "tool_call", "toolCallId": "c", "title": "Run", "status": "in_progress"}));
         t.push(AgentEntry::Permission { id: 1, title: "Run?".into(), options: vec![], chosen: None });
-        assert_eq!(t.end_turn(), vec![2, 3]);
+        assert_eq!(t.end_turn(None), vec![2, 3]);
         let again = Timeline::from_entries(t.entries.clone());
         assert_eq!(again.plan, Some(0));
         assert_eq!(again.tools.get("c"), Some(&2));
     }
 
+    #[test]
+    fn end_turn_records_when_the_last_message_was_answered() {
+        let user =
+            |sent: f64| AgentEntry::User { text: "q".into(), attachments: vec![], sent_ms: Some(sent), done_ms: None };
+        let mut t = Timeline::default();
+        t.push(user(1.0));
+        t.push(AgentEntry::Agent { text: "a".into() });
+        t.push(user(2.0));
+        assert_eq!(t.end_turn(Some(5.0)), vec![2]);
+        assert!(matches!(t.entries[0], AgentEntry::User { done_ms: None, .. }));
+        assert!(matches!(t.entries[2], AgentEntry::User { done_ms: Some(5.0), .. }));
+        // Settled once: a later end (a restart) doesn't move it.
+        assert_eq!(t.end_turn(Some(9.0)), Vec::<usize>::new());
+    }
+
     #[test]
     fn long_output_keeps_its_tail() {
         let s = tail("é".repeat(MAX_OUTPUT));

src/bindings.ts

@@ -986,7 +986,11 @@ export type AgentConfigVia =
 /**  One item of a task's conversation. */
 export type AgentEntry = { type: "user"; text: string; 
 /**  Names of the files and images sent with it. */
-attachments: string[] } | { type: "agent"; text: string } | { type: "thought"; text: string } | { type: "tool"; id: string; title: string; 
+attachments: string[]; 
+/**  When it was sent (ms since the epoch); `None` in tasks saved before this was kept. */
+sentMs?: number | null; 
+/**  When the turn it started ended; `None` while it runs or when it was cut off. */
+doneMs?: number | null } | { type: "agent"; text: string } | { type: "thought"; text: string } | { type: "tool"; id: string; title: string; 
 /**  ACP tool kind: `read`, `edit`, `execute`, `search`, `fetch`, `think`… */
 kind: string; status: AgentToolStatus; locations: IpcPath[]; 
 /**  Text the tool reported (command output…), truncated. */

src/features/agents/Composer.tsx

@@ -80,6 +80,15 @@ export function Composer(props: ComposerProps) {
     if (props.autoFocus) ref.current?.focus();
   }, [props.autoFocus]);
 
+  const focus = useAgents((s) => (s.focus?.key === id ? s.focus.seq : 0));
+  useEffect(() => {
+    const el = ref.current;
+    if (!focus || !el) return;
+    el.focus();
+    el.setSelectionRange(el.value.length, el.value.length);
+    el.scrollTop = el.scrollHeight;
+  }, [focus]);
+
   // Grow with the text, up to a limit.
   useLayoutEffect(() => {
     const el = ref.current;

src/features/agents/Markdown.tsx

@@ -1,8 +1,18 @@
-/** Agent messages: Markdown → sanitized HTML (marked + DOMPurify). */
-import { useMemo } from "react";
+/**
+ * Agent messages: Markdown → sanitized HTML (marked + DOMPurify). Fenced code is
+ * highlighted and gets a Copy button; inline code naming a file of the task opens it.
+ */
+import { useLayoutEffect, useMemo, useRef } from "react";
 import { Marked } from "marked";
 import DOMPurify from "dompurify";
+import { highlightInto } from "@/editor/lsp/markdown";
+import { iconNode } from "@/editor/lsp/iconMarkup";
+import { call, commands } from "@/platform/ipc";
+import { tx } from "@/platform/i18n";
 import { openExternalUrl } from "@/platform/openUrl";
+import { copyText } from "@/ui";
+import { editorService } from "@/workbench/contributions";
+import { pathLink, type PathLink } from "./conversation";
 import styles from "./Session.module.css";
 
 const marked = new Marked({ gfm: true, breaks: true });
@@ -12,13 +22,85 @@ export function markdownHtml(text: string): string {
   return DOMPurify.sanitize(html, { USE_PROFILES: { html: true } });
 }
 
-export function Markdown({ text }: { text: string }) {
+/** Whether a path names an existing file, per path (agents name the same files again and again). */
+const existing = new Map<string, Promise<boolean>>();
+function fileExists(path: string): Promise<boolean> {
+  let known = existing.get(path);
+  if (!known) {
+    known = call(commands.fsProbe(path)).then(
+      () => true,
+      () => false,
+    );
+    existing.set(path, known);
+  }
+  return known;
+}
+
+export function openPathLink(link: PathLink) {
+  const selection = link.line === undefined ? undefined : { line: link.line, col: link.col ?? 0 };
+  void editorService().openFile(link.path, { selection, focus: true });
+}
+
+/** Highlighting, Copy buttons and file links over freshly rendered `root`. */
+function enhance(root: HTMLElement, cwd: string): () => void {
+  let alive = true;
+  root.querySelectorAll<HTMLElement>("pre > code").forEach((code) => {
+    const pre = code.parentElement!;
+    const lang = [...code.classList].find((c) => c.startsWith("language-"))?.slice("language-".length) ?? null;
+    const text = (code.textContent ?? "").replace(/\n+$/, "");
+    code.textContent = text;
+    void highlightInto(code, text, lang);
+    const copy = document.createElement("button");
+    copy.type = "button";
+    copy.className = styles.codeCopy!;
+    const label = tx("Copy Code");
+    copy.title = label;
+    copy.setAttribute("aria-label", label);
+    copy.appendChild(iconNode("copy", 14));
+    copy.dataset.copy = text;
+    pre.appendChild(copy);
+  });
+  root.querySelectorAll<HTMLElement>("code").forEach((code) => {
+    if (code.parentElement?.tagName === "PRE" || code.closest("a")) return;
+    const link = pathLink(code.textContent ?? "", cwd);
+    if (!link) return;
+    void fileExists(link.path).then((exists) => {
+      if (!alive || !exists) return;
+      code.classList.add(styles.fileLink!);
+      code.dataset.path = link.path;
+      if (link.line !== undefined) code.dataset.line = String(link.line);
+      if (link.col !== undefined) code.dataset.col = String(link.col);
+      code.title = tx`Open ${link.path}`;
+    });
+  });
+  return () => {
+    alive = false;
+  };
+}
+
+export function Markdown({ text, cwd }: { text: string; cwd: string }) {
   const html = useMemo(() => markdownHtml(text), [text]);
+  const ref = useRef<HTMLDivElement>(null);
+  useLayoutEffect(() => (ref.current ? enhance(ref.current, cwd) : undefined), [html, cwd]);
   return (
     <div
+      ref={ref}
       className={styles.markdown}
       onClick={(e) => {
-        const a = (e.target as HTMLElement).closest("a");
+        const target = e.target as HTMLElement;
+        const copy = target.closest<HTMLElement>("button[data-copy]");
+        if (copy) {
+          void copyText(copy.dataset.copy ?? "");
+          return;
+        }
+        const file = target.closest<HTMLElement>("code[data-path]");
+        if (file && !window.getSelection()?.toString()) {
+          const line = file.dataset.line === undefined ? undefined : Number(file.dataset.line);
+          const col = file.dataset.col === undefined ? undefined : Number(file.dataset.col);
+          openPathLink({ path: file.dataset.path!, line, col });
+          return;
+        }
+        const a = target.closest("a");
         if (!a) return;
         e.preventDefault();
         if (/^https?:/i.test(a.href)) void openExternalUrl(a.href);

src/features/agents/Session.module.css

@@ -96,6 +96,15 @@
   cursor: default;
 }
 
+/* The conversation plus what floats over it (find bar, Quote, Jump to Bottom). */
+.streamArea {
+  position: relative;
+  flex: 1;
+  min-height: 0;
+  display: flex;
+  flex-direction: column;
+}
+
 .stream {
   flex: 1;
   min-height: 0;
@@ -105,6 +114,101 @@
   flex-direction: column;
   gap: 10px;
 }
+.stream:focus {
+  outline: none;
+}
+
+/* A message with its actions, shown on hover. */
+.message {
+  position: relative;
+}
+.messageMeta {
+  display: flex;
+  align-items: center;
+  min-height: 20px;
+  padding-left: 12px;
+  font-size: var(--fs-small);
+}
+.messageActions {
+  display: inline-flex;
+  gap: 2px;
+  margin-left: 6px;
+  opacity: 0;
+  pointer-events: none;
+  -webkit-user-select: none;
+  user-select: none;
+}
+/* Over the bottom-right corner of an agent message (code blocks keep the top one), taking no room of its own. */
+.floatingActions {
+  position: absolute;
+  z-index: 1;
+  bottom: -14px;
+  right: 0;
+  margin: 0;
+  padding: 1px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-small);
+  background: var(--bg-popup);
+  box-shadow: var(--shadow-tooltip);
+}
+.message:hover .messageActions,
+.messageActions:focus-within {
+  opacity: 1;
+  pointer-events: auto;
+}
+
+.jumpToBottom {
+  position: absolute;
+  right: 16px;
+  bottom: 12px;
+  background: var(--bg-popup);
+  border: 1px solid var(--border);
+  border-radius: 50%;
+  box-shadow: var(--shadow-tooltip);
+}
+
+.quoteButton {
+  position: absolute;
+  z-index: 2;
+  height: 24px;
+  padding: 0 10px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-small);
+  background: var(--bg-popup);
+  color: var(--fg);
+  box-shadow: var(--shadow-tooltip);
+  cursor: pointer;
+  -webkit-user-select: none;
+  user-select: none;
+}
+.quoteButton:hover {
+  background: var(--bg-hover);
+}
+
+.findBar {
+  flex: none;
+  display: flex;
+  align-items: center;
+  gap: 2px;
+  padding: 4px 8px;
+  border-bottom: 1px solid var(--border);
+}
+.findField {
+  flex: 1;
+  min-width: 0;
+}
+.findCount {
+  color: var(--fg-subtle);
+  font-size: var(--fs-small);
+  white-space: nowrap;
+}
+
+::highlight(agent-find) {
+  background-color: var(--bg-text-search-result);
+}
+::highlight(agent-find-current) {
+  background-color: var(--bg-text-search-result-current);
+}
 
 .user {
   padding: 2px 0 2px 10px;
@@ -141,6 +245,79 @@
   padding: 0;
   background: none;
 }
+.markdown :global(pre) {
+  position: relative;
+}
+.codeCopy {
+  position: absolute;
+  top: 4px;
+  right: 4px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 22px;
+  height: 22px;
+  padding: 0;
+  border: none;
+  border-radius: var(--radius-small);
+  background: var(--bg-elev);
+  color: var(--fg-secondary);
+  cursor: pointer;
+  opacity: 0;
+}
+.markdown :global(pre:hover) .codeCopy,
+.codeCopy:focus-visible {
+  opacity: 1;
+}
+.codeCopy:hover {
+  background: var(--bg-hover);
+}
+.fileLink {
+  color: var(--link);
+  cursor: pointer;
+}
+.fileLink:hover {
+  text-decoration: underline;
+}
+
+/* Lezer classHighlighter tokens in fenced code (same colours as the Markdown preview). */
+.markdown :global(.tok-keyword),
+.markdown :global(.tok-modifier),
+.markdown :global(.tok-controlKeyword),
+.markdown :global(.tok-operatorKeyword) {
+  color: var(--syn-keyword);
+}
+.markdown :global(.tok-string),
+.markdown :global(.tok-string2) {
+  color: var(--syn-string);
+}
+.markdown :global(.tok-number),
+.markdown :global(.tok-bool),
+.markdown :global(.tok-atom) {
+  color: var(--syn-number);
+}
+.markdown :global(.tok-typeName),
+.markdown :global(.tok-className),
+.markdown :global(.tok-namespace) {
+  color: var(--syn-type);
+}
+.markdown :global(.tok-comment) {
+  color: var(--syn-comment);
+}
+.markdown :global(.tok-meta),
+.markdown :global(.tok-macroName) {
+  color: var(--syn-annotation);
+}
+.markdown :global(.tok-propertyName) {
+  color: var(--syn-property);
+}
+.markdown :global(.tok-variableName.tok-definition) {
+  color: var(--syn-function);
+}
+.markdown :global(.tok-punctuation),
+.markdown :global(.tok-operator) {
+  color: var(--syn-punct);
+}
 .markdown :global(ul),
 .markdown :global(ol) {
   margin: 0 0 8px;

src/features/agents/SessionEditor.tsx

@@ -1,16 +1,30 @@
 /** An agent task as an editor tab: the conversation, a composer and the task's changed files. */
-import { useEffect, useLayoutEffect, useMemo, useRef, useState } from "react";
+import { useCallback, useEffect, useLayoutEffect, useMemo, useRef, useState, type RefObject } from "react";
 import clsx from "clsx";
 import type { AgentChange, AgentEntry, AgentTask } from "@/bindings";
 import { executeAction } from "@/platform/actions";
 import { call, commands } from "@/platform/ipc";
 import { basename, relativeDir, useProject } from "@/platform/project";
 import { editorService, notifications, type EditorInput } from "@/workbench/contributions";
-import { Button, EmptyState, Icon, IconButton, Spinner, T, Tree, fileIconName } from "@/ui";
+import {
+  Button,
+  EmptyState,
+  Icon,
+  IconButton,
+  SearchField,
+  Spinner,
+  T,
+  Tree,
+  copyText,
+  fileIconName,
+  selectableText,
+} from "@/ui";
+import { useTx } from "@/platform/i18n";
 import { TaskStatusIcon } from "./AgentsView";
 import { Composer } from "./Composer";
 import { canSend, emptyDraft, usageLabel } from "./composerModel";
 import { ConfigPickers } from "./ConfigPickers";
+import { findRanges, formatDuration, formatSentAt } from "./conversation";
 import { Markdown } from "./Markdown";
 import { branchLabel, isBusy, providerIcon, statusLabel } from "./model";
 import {
@@ -19,8 +33,11 @@ import {
   loadEntries,
   markVisible,
   refreshChanges,
+  editMessage,
   editQueued,
+  quoteInComposer,
   removeQueued,
+  resendMessage,
   respond,
   sendMessage,
   sendQueuedNow,
@@ -28,6 +45,7 @@ import {
   useAgentCommands,
   useAgents,
 } from "./store";
+import { setFocusedSession, focusedSession, type FocusedSession } from "./sessionFocus";
 import styles from "./Session.module.css";
 
 export function SessionEditor({ input }: { input: EditorInput }) {
@@ -40,13 +58,41 @@ export function SessionEditor({ input }: { input: EditorInput }) {
     void refreshChanges(id);
     return markVisible(id);
   }, [id]);
+  const [finding, setFinding] = useState(false);
+  const [findFocus, setFindFocus] = useState(0);
+  const [session] = useState<FocusedSession>(() => ({
+    openFind: () => {
+      setFinding(true);
+      setFindFocus((n) => n + 1);
+    },
+  }));
+  useEffect(
+    () => () => {
+      if (focusedSession() === session) setFocusedSession(null);
+    },
+    [session],
+  );
   if (!task) return <EmptyState title="This agent task no longer exists" />;
   return (
-    <div className={styles.session}>
+    <div
+      className={styles.session}
+      onFocusCapture={() => setFocusedSession(session)}
+      onBlurCapture={(e) => {
+        if (!e.currentTarget.contains(e.relatedTarget as Node | null) && focusedSession() === session) {
+          setFocusedSession(null);
+        }
+      }}
+    >
       <div className={styles.conversation}>
         <Header task={task} />
         <PermissionBanner task={task} entries={entries ?? null} />
-        <Stream task={task} entries={entries ?? null} />
+        <Stream
+          task={task}
+          entries={entries ?? null}
+          finding={finding}
+          findFocus={findFocus}
+          onCloseFind={() => setFinding(false)}
+        />
         <SessionComposer task={task} entries={entries ?? null} />
       </div>
       <ChangesPane task={task} changes={changes ?? null} />
@@ -106,34 +152,248 @@ function Usage({ task }: { task: AgentTask }) {
   );
 }
 
-function Stream({ task, entries }: { task: AgentTask; entries: AgentEntry[] | null }) {
+interface StreamProps {
+  task: AgentTask;
+  entries: AgentEntry[] | null;
+  finding: boolean;
+  /** Bumped by Find in Conversation: focus the find field again. */
+  findFocus: number;
+  onCloseFind: () => void;
+}
+
+function Stream({ task, entries, finding, findFocus, onCloseFind }: StreamProps) {
+  const tx = useTx();
   const ref = useRef<HTMLDivElement>(null);
   const stick = useRef(true);
+  const [atBottom, setAtBottom] = useState(true);
   useLayoutEffect(() => {
     const el = ref.current;
     if (el && stick.current) el.scrollTop = el.scrollHeight;
   });
   const waiting = entries?.some((e) => e.type === "permission" && !e.chosen);
+  const lastUser = entries?.findLast((e): e is UserEntry => e.type === "user");
+  const toBottom = () => {
+    const el = ref.current;
+    if (!el) return;
+    stick.current = true;
+    el.scrollTo({ top: el.scrollHeight, behavior: "smooth" });
+  };
   return (
-    <div
-      ref={ref}
-      className={styles.stream}
-      onScroll={(e) => {
-        const el = e.currentTarget;
-        stick.current = el.scrollHeight - el.scrollTop - el.clientHeight < 40;
+    <div className={styles.streamArea}>
+      {finding && <FindBar streamRef={ref} focus={findFocus} onClose={onCloseFind} />}
+      <div
+        ref={ref}
+        // The conversation is read and copied like a document; focusable so ⌘F reaches it.
+        className={clsx(styles.stream, selectableText)}
+        tabIndex={-1}
+        onScroll={(e) => {
+          const el = e.currentTarget;
+          stick.current = el.scrollHeight - el.scrollTop - el.clientHeight < 40;
+          setAtBottom(stick.current);
+        }}
+      >
+        {entries === null ? (
+          <Spinner />
+        ) : (
+          entries.map((entry, i) => <Entry key={i} task={task} entry={entry} />)
+        )}
+        {(task.status === "running" || task.status === "starting") && !waiting && (
+          <div className={styles.working}>
+            <Spinner size={12} />
+            <T>{task.status === "starting" ? "Starting the agent…" : "Working…"}</T>
+            {lastUser?.sentMs != null && !lastUser.doneMs && <Elapsed since={lastUser.sentMs} />}
+          </div>
+        )}
+      </div>
+      <QuoteSelection task={task} streamRef={ref} />
+      {!atBottom && (
+        <IconButton
+          icon="arrow-down"
+          title={tx("Jump to Bottom")}
+          className={styles.jumpToBottom}
+          onClick={toBottom}
+        />
+      )}
+    </div>
+  );
+}
+
+type UserEntry = Extract<AgentEntry, { type: "user" }>;
+
+/** Time since `since`, ticking every second. */
+function Elapsed({ since }: { since: number }) {
+  const [now, setNow] = useState(() => Date.now());
+  useEffect(() => {
+    const t = setInterval(() => setNow(Date.now()), 1000);
+    return () => clearInterval(t);
+  }, []);
+  return <span className={styles.muted}>{formatDuration(now - since)}</span>;
+}
+
+/** A Quote button next to text selected in the conversation: replies to it in the composer. */
+function QuoteSelection({ task, streamRef }: { task: AgentTask; streamRef: RefObject<HTMLDivElement | null> }) {
+  const [at, setAt] = useState<{ left: number; top: number } | null>(null);
+  const place = useCallback(() => {
+    const stream = streamRef.current;
+    const sel = window.getSelection();
+    if (!stream || !sel || sel.isCollapsed || !sel.rangeCount || !sel.toString().trim()) return setAt(null);
+    const range = sel.getRangeAt(0);
+    if (!stream.contains(range.commonAncestorContainer)) return setAt(null);
+    const rects = range.getClientRects();
+    const last = rects[rects.length - 1] ?? range.getBoundingClientRect();
+    const area = stream.parentElement!.getBoundingClientRect();
+    const box = stream.getBoundingClientRect();
+    if (last.bottom < box.top || last.top > box.bottom) return setAt(null);
+    setAt({
+      left: Math.min(Math.max(last.right - area.left, 0), area.width - 80),
+      top: Math.min(last.bottom - area.top + 4, box.bottom - area.top - 28),
+    });
+  }, [streamRef]);
+  useEffect(() => {
+    const stream = streamRef.current;
+    document.addEventListener("selectionchange", place);
+    stream?.addEventListener("scroll", place);
+    return () => {
+      document.removeEventListener("selectionchange", place);
+      stream?.removeEventListener("scroll", place);
+    };
+  }, [place, streamRef]);
+  if (!at || task.status === "archived") return null;
+  return (
+    <button
+      type="button"
+      className={styles.quoteButton}
+      style={{ left: at.left, top: at.top }}
+      // Keep the selection: it is what gets quoted.
+      onMouseDown={(e) => e.preventDefault()}
+      onClick={() => {
+        const text = window.getSelection()?.toString() ?? "";
+        window.getSelection()?.removeAllRanges();
+        setAt(null);
+        if (text.trim()) quoteInComposer(task.id, text);
       }}
     >
-      {entries === null ? (
-        <Spinner />
-      ) : (
-        entries.map((entry, i) => <Entry key={i} task={task} entry={entry} />)
-      )}
-      {(task.status === "running" || task.status === "starting") && !waiting && (
-        <div className={styles.working}>
-          <Spinner size={12} />
-          <T>{task.status === "starting" ? "Starting the agent…" : "Working…"}</T>
-        </div>
-      )}
+      <T>Quote</T>
+    </button>
+  );
+}
+
+const highlights = (globalThis as { CSS?: { highlights?: Map<string, unknown> } }).CSS?.highlights;
+const HighlightCtor = (globalThis as { Highlight?: new (...ranges: Range[]) => unknown }).Highlight;
+
+function setHighlight(name: string, ranges: Range[]) {
+  if (!highlights || !HighlightCtor) return;
+  if (ranges.length) highlights.set(name, new HighlightCtor(...ranges));
+  else highlights.delete(name);
+}
+
+/** Scrolls `range` into view in `stream`, opening the collapsed tool output or thought holding it. */
+function revealRange(range: Range, stream: HTMLElement) {
+  for (let el = range.startContainer.parentElement; el && el !== stream; el = el.parentElement) {
+    if (el instanceof HTMLDetailsElement) el.open = true;
+  }
+  const r = range.getBoundingClientRect();
+  const box = stream.getBoundingClientRect();
+  if (r.top < box.top + 24 || r.bottom > box.bottom - 24) {
+    stream.scrollTop += r.top - box.top - box.height / 3;
+  }
+}
+
+/** Find in Conversation: every match highlighted, Enter / ⇧Enter step through them. */
+function FindBar({
+  streamRef,
+  focus,
+  onClose,
+}: {
+  streamRef: RefObject<HTMLDivElement | null>;
+  focus: number;
+  onClose: () => void;
+}) {
+  const tx = useTx();
+  const input = useRef<HTMLInputElement>(null);
+  const [query, setQuery] = useState("");
+  const [ranges, setRanges] = useState<Range[]>([]);
+  const [current, setCurrent] = useState(0);
+
+  useEffect(() => {
+    input.current?.focus();
+    input.current?.select();
+  }, [focus]);
+
+  // Matches follow the conversation as it streams in (and as code gets highlighted).
+  useEffect(() => {
+    const stream = streamRef.current;
+    if (!stream) return;
+    let frame = 0;
+    const update = () => {
+      cancelAnimationFrame(frame);
+      frame = requestAnimationFrame(() => setRanges(findRanges(stream, query.trim())));
+    };
+    update();
+    const observer = new MutationObserver(update);
+    observer.observe(stream, { subtree: true, childList: true, characterData: true });
+    return () => {
+      cancelAnimationFrame(frame);
+      observer.disconnect();
+    };
+  }, [query, streamRef]);
+
+  const index = ranges.length ? Math.min(current, ranges.length - 1) : -1;
+  useEffect(() => {
+    setHighlight("agent-find", ranges);
+    setHighlight("agent-find-current", index >= 0 ? [ranges[index]!] : []);
+  }, [ranges, index]);
+  useEffect(
+    () => () => {
+      setHighlight("agent-find", []);
+      setHighlight("agent-find-current", []);
+    },
+    [],
+  );
+
+  const step = (dir: 1 | -1) => {
+    const stream = streamRef.current;
+    if (!ranges.length || !stream) return;
+    const next = (index + dir + ranges.length) % ranges.length;
+    setCurrent(next);
+    revealRange(ranges[next]!, stream);
+  };
+  const close = () => {
+    onClose();
+    streamRef.current?.focus();
+  };
+
+  return (
+    <div className={styles.findBar} role="search">
+      <SearchField
+        ref={input}
+        value={query}
+        onChange={(v) => {
+          setQuery(v);
+          setCurrent(0);
+        }}
+        aria-label={tx("Find in Conversation")}
+        placeholder={tx("Find in conversation")}
+        className={styles.findField}
+        trailing={
+          query.trim() ? (
+            <span className={styles.findCount}>{ranges.length ? `${index + 1}/${ranges.length}` : tx("0 results")}</span>
+          ) : null
+        }
+        onKeyDown={(e) => {
+          if (e.key === "Enter") {
+            e.preventDefault();
+            step(e.shiftKey ? -1 : 1);
+          } else if (e.key === "Escape") {
+            e.preventDefault();
+            e.stopPropagation();
+            close();
+          }
+        }}
+      />
+      <IconButton icon="arrow-up" title={tx("Previous Occurrence")} size="small" disabled={!ranges.length} onClick={() => step(-1)} />
+      <IconButton icon="arrow-down" title={tx("Next Occurrence")} size="small" disabled={!ranges.length} onClick={() => step(1)} />
+      <IconButton icon="close" title={tx("Close")} size="small" onClick={close} />
     </div>
   );
 }
@@ -152,23 +412,16 @@ const TOOL_ICONS: Record<string, string> = {
 function Entry({ task, entry }: { task: AgentTask; entry: AgentEntry }) {
   switch (entry.type) {
     case "user":
+      return <UserMessage task={task} entry={entry} />;
+    case "agent":
       return (
-        <div className={styles.user}>
-          {entry.text}
-          {entry.attachments.length > 0 && (
-            <div className={styles.attachments}>
-              {entry.attachments.map((a, i) => (
-                <span key={i} className={styles.attachment}>
-                  <Icon name={fileIconName(a)} size={12} />
-                  {a}
-                </span>
-              ))}
-            </div>
-          )}
+        <div className={styles.message}>
+          <Markdown text={entry.text} cwd={task.cwd} />
+          <div className={clsx(styles.messageActions, styles.floatingActions)}>
+            <IconButton icon="copy" title="Copy" size="small" onClick={() => void copyText(entry.text)} />
+          </div>
         </div>
       );
-    case "agent":
-      return <Markdown text={entry.text} />;
     case "thought":
       return (
         <details className={styles.thought}>
@@ -206,6 +459,60 @@ function Entry({ task, entry }: { task: AgentTask; entry: AgentEntry }) {
   }
 }
 
+function UserMessage({ task, entry }: { task: AgentTask; entry: UserEntry }) {
+  const tx = useTx();
+  const fail = (e: unknown) => notifications().notify({ level: "error", title: "Couldn't send the message", body: String(e) });
+  const archived = task.status === "archived";
+  return (
+    <div className={styles.message}>
+      <div className={styles.user}>
+        {entry.text}
+        {entry.attachments.length > 0 && (
+          <div className={styles.attachments}>
+            {entry.attachments.map((a, i) => (
+              <span key={i} className={styles.attachment}>
+                <Icon name={fileIconName(a)} size={12} />
+                {a}
+              </span>
+            ))}
+          </div>
+        )}
+      </div>
+      <div className={styles.messageMeta}>
+        {entry.sentMs != null && (
+          <span className={styles.muted} title={new Date(entry.sentMs).toLocaleString()}>
+            {formatSentAt(entry.sentMs)}
+          </span>
+        )}
+        {entry.sentMs != null && entry.doneMs != null && (
+          <span className={styles.muted} title={tx("Time the agent took to answer")}>
+            {`\u00a0· ${formatDuration(entry.doneMs - entry.sentMs)}`}
+          </span>
+        )}
+        <span className={styles.messageActions}>
+          <IconButton icon="copy" title="Copy" size="small" onClick={() => void copyText(entry.text)} />
+          {!archived && entry.text && (
+            <IconButton
+              icon="edit"
+              title="Edit and Resend"
+              size="small"
+              onClick={() => editMessage(task.id, entry.text)}
+            />
+          )}
+          {!archived && entry.text && entry.attachments.length === 0 && (
+            <IconButton
+              icon="refresh"
+              title="Send Again"
+              size="small"
+              onClick={() => void resendMessage(task.id, entry.text).catch(fail)}
+            />
+          )}
+        </span>
+      </div>
+    </div>
+  );
+}
+
 function ToolEntry({ task, entry }: { task: AgentTask; entry: Extract<AgentEntry, { type: "tool" }> }) {
   const head = (
     <>

src/features/agents/conversation.test.ts

@@ -0,0 +1,50 @@
+import { describe, expect, it } from "vitest";
+import { findAll, findRanges, formatDuration, pathLink, quoteText, withQuote } from "./conversation";
+
+describe("quoting", () => {
+  it("quotes each line and leaves a line to type on", () => {
+    expect(quoteText("one\n\ntwo\n")).toBe("> one\n>\n> two\n\n");
+  });
+  it("adds the quote after a draft", () => {
+    expect(withQuote("", "x")).toBe("> x\n\n");
+    expect(withQuote("Why?  ", "x")).toBe("Why?\n\n> x\n\n");
+  });
+});
+
+describe("pathLink", () => {
+  const cwd = "/repo";
+  it("resolves relative paths with a line and column", () => {
+    expect(pathLink("src/lib.rs", cwd)).toEqual({ path: "/repo/src/lib.rs" });
+    expect(pathLink("./src/main.rs:12", cwd)).toEqual({ path: "/repo/src/main.rs", line: 11 });
+    expect(pathLink("a/b.ts:3:5", cwd)).toEqual({ path: "/repo/a/b.ts", line: 2, col: 4 });
+    expect(pathLink("Cargo.toml", cwd)).toEqual({ path: "/repo/Cargo.toml" });
+    expect(pathLink("/abs/x.py#L7", cwd)).toEqual({ path: "/abs/x.py", line: 6 });
+  });
+  it("ignores code that isn't a path", () => {
+    for (const t of ["foo()", "cargo test", "https://x.dev/a.md", "inventory", "1.5", "v2.0", "a.b()", "failing-tests", "tests/"]) {
+      expect(pathLink(t, cwd)).toBeNull();
+    }
+  });
+});
+
+describe("formatDuration", () => {
+  it("scales the unit", () => {
+    expect(formatDuration(850)).toBe("850ms");
+    expect(formatDuration(12_400)).toBe("12s");
+    expect(formatDuration(65_000)).toBe("1m 05s");
+    expect(formatDuration(2 * 3600_000 + 3 * 60_000)).toBe("2h 03m");
+  });
+});
+
+describe("finding", () => {
+  it("finds every occurrence, ignoring case", () => {
+    expect(findAll("Abc abc ABC", "abc")).toEqual([0, 4, 8]);
+    expect(findAll("aaa", "")).toEqual([]);
+  });
+  it("maps matches to DOM ranges", () => {
+    const root = document.createElement("div");
+    root.innerHTML = "<p>one <code>two</code> one</p>";
+    expect(findRanges(root, "one").map((r) => r.toString())).toEqual(["one", "one"]);
+    expect(findRanges(root, "TWO")).toHaveLength(1);
+  });
+});

src/features/agents/conversation.ts

@@ -0,0 +1,88 @@
+/** Reading an agent conversation: quoting, file links, turn times and finding text. */
+
+/** `text` as a Markdown quote for the composer, followed by an empty line to type in. */
+export function quoteText(text: string): string {
+  const lines = text.replace(/\s+$/, "").split("\n");
+  return `${lines.map((l) => (l ? `> ${l}` : ">")).join("\n")}\n\n`;
+}
+
+/** Appends a quote to a draft, on its own paragraph. */
+export function withQuote(draft: string, text: string): string {
+  if (!draft.trim()) return quoteText(text);
+  return `${draft.replace(/\s+$/, "")}\n\n${quoteText(text)}`;
+}
+
+export interface PathLink {
+  /** Absolute path. */
+  path: string;
+  /** 0-based line and column, when the text names them. */
+  line?: number;
+  col?: number;
+}
+
+const PATH = /^(?:\.\/)?([\w.@-]+(?:\/[\w.@-]+)*\.[A-Za-z][A-Za-z0-9]*)(?::(\d+)(?::(\d+))?|#L(\d+))?$/;
+
+/**
+ * The file an inline code span names (`src/lib.rs`, `src/main.rs:12`, `a/b.ts:3:5`,
+ * `/abs/x.py#L7`), resolved against `cwd`; null for text that isn't a file path
+ * (`foo()`, `cargo test`, URLs, `1.5`, folders, words without an extension).
+ */
+export function pathLink(text: string, cwd: string): PathLink | null {
+  const t = text.trim();
+  if (!t || /\s|:\/\//.test(t)) return null;
+  const absolute = t.startsWith("/");
+  const m = PATH.exec(absolute ? t.slice(1) : t);
+  if (!m) return null;
+  const rel = m[1]!;
+  const path = absolute ? `/${rel}` : `${cwd.replace(/\/$/, "")}/${rel}`;
+  const line = m[2] ?? m[4];
+  const out: PathLink = { path };
+  if (line) out.line = Math.max(0, Number(line) - 1);
+  if (m[3]) out.col = Math.max(0, Number(m[3]) - 1);
+  return out;
+}
+
+/** `850ms`, `12s`, `1m 05s`, `2h 03m`. */
+export function formatDuration(ms: number): string {
+  if (ms < 1000) return `${Math.max(0, Math.round(ms))}ms`;
+  const s = Math.floor(ms / 1000);
+  if (s < 60) return `${s}s`;
+  const m = Math.floor(s / 60);
+  if (m < 60) return `${m}m ${String(s % 60).padStart(2, "0")}s`;
+  return `${Math.floor(m / 60)}h ${String(m % 60).padStart(2, "0")}m`;
+}
+
+/** Clock time of a message: `14:03` today, else with the date. */
+export function formatSentAt(ms: number, now = Date.now()): string {
+  const d = new Date(ms);
+  const time = d.toLocaleTimeString(undefined, { hour: "2-digit", minute: "2-digit" });
+  return new Date(now).toDateString() === d.toDateString()
+    ? time
+    : `${d.toLocaleDateString(undefined, { month: "short", day: "numeric" })} ${time}`;
+}
+
+/** Start offsets of `query` in `text`, ignoring case; empty for an empty query. */
+export function findAll(text: string, query: string): number[] {
+  if (!query) return [];
+  const hay = text.toLowerCase();
+  const needle = query.toLowerCase();
+  const out: number[] = [];
+  for (let i = hay.indexOf(needle); i >= 0; i = hay.indexOf(needle, i + needle.length)) out.push(i);
+  return out;
+}
+
+/** DOM ranges of `query` in the text under `root` (matches within one text node). */
+export function findRanges(root: Node, query: string): Range[] {
+  const out: Range[] = [];
+  if (!query) return out;
+  const walker = document.createTreeWalker(root, NodeFilter.SHOW_TEXT);
+  for (let node = walker.nextNode(); node; node = walker.nextNode()) {
+    for (const at of findAll(node.textContent ?? "", query)) {
+      const range = document.createRange();
+      range.setStart(node, at);
+      range.setEnd(node, at + query.length);
+      out.push(range);
+    }
+  }
+  return out;
+}

src/features/agents/index.ts

@@ -17,6 +17,7 @@ import {
 import { AgentsStatus } from "./AgentsStatus";
 import { HOME_KIND, SESSION_KIND, TOOL_WINDOW } from "./model";
 import { sendPaths, sendSelection } from "./references";
+import { focusedSession } from "./sessionFocus";
 import { connect, disconnect, openHome, useAgents } from "./store";
 
 export function activate(): () => void {
@@ -71,6 +72,14 @@ export function activate(): () => void {
           : [],
     }),
     registerActions([
+      {
+        id: "agents.findInConversation",
+        title: "Find in Conversation",
+        category: "Agents",
+        icon: "search",
+        when: "agentSessionFocus",
+        run: () => focusedSession()?.openFind(),
+      },
       {
         id: "agents.newTask",
         title: "New Agent Task",

src/features/agents/sessionFocus.ts

@@ -0,0 +1,15 @@
+/** The agent session tab holding focus, for actions that act on it (Find in Conversation). */
+import { setContext } from "@/platform/context";
+
+export interface FocusedSession {
+  openFind(): void;
+}
+
+let focused: FocusedSession | null = null;
+
+export function setFocusedSession(session: FocusedSession | null) {
+  focused = session;
+  setContext("agentSessionFocus", !!session);
+}
+
+export const focusedSession = () => focused;

src/features/agents/store.ts

@@ -14,6 +14,7 @@ import type {
 import { call, commands, isTauri } from "@/platform/ipc";
 import { editorService, notifications } from "@/workbench/contributions";
 import { canSend, emptyDraft, toPrompt, type ComposerDraft, type FileRef } from "./composerModel";
+import { withQuote } from "./conversation";
 import { HOME_KEY, HOME_KIND, SESSION_KIND, attentionChange, isBusy, sessionKey, upsertEntry } from "./model";
 
 /** New Task page settings (its text lives in the `HOME` composer). */
@@ -44,6 +45,8 @@ interface AgentsState {
   lastComposer: string;
   /** First messages of past tasks, newest first (New Task page ↑). */
   history: string[];
+  /** The composer asked to take focus (`seq` tells repeated requests apart). */
+  focus: { key: string; seq: number } | null;
 }
 
 const DRAFT_KEY = "openidea.agents.draft.v2";
@@ -80,6 +83,7 @@ export const useAgents = create<AgentsState>(() => ({
   composers: new Map(),
   lastComposer: HOME,
   history: load<string[]>(HISTORY_KEY, []),
+  focus: null,
 }));
 
 export function updateDraft(patch: Partial<Draft>) {
@@ -307,6 +311,28 @@ export async function sendMessage(task: string, now: boolean): Promise<void> {
   updateComposer(task, emptyDraft());
 }
 
+/** Moves the caret to the end of composer `key`. */
+export function focusComposer(key: string) {
+  useAgents.setState((s) => ({ focus: { key, seq: (s.focus?.seq ?? 0) + 1 } }));
+}
+
+/** Quotes `text` (a selection of the conversation) in the task's composer, to reply to it. */
+export function quoteInComposer(task: string, text: string) {
+  updateComposer(task, { text: withQuote(composerDraft(task).text, text) });
+  focusComposer(task);
+}
+
+/** Puts an earlier message back into the composer to edit and send again. */
+export function editMessage(task: string, text: string) {
+  const current = composerDraft(task).text;
+  updateComposer(task, { text: current.trim() ? `${text}\n${current}` : text });
+  focusComposer(task);
+}
+
+/** Sends an earlier message again (queued while the agent works). */
+export const resendMessage = (task: string, text: string) =>
+  call(commands.agentPrompt(task, { text, files: [], images: [] }, false));
+
 /** Takes a queued message back into the composer to edit it. */
 export async function editQueued(task: string, queued: string): Promise<void> {
   const item = await call(commands.agentUnqueue(task, queued));

src/platform/keymaps/intellij-macos.ts

@@ -61,6 +61,7 @@ export const intellijMacos: Record<string, string[]> = {
 
   // Find
   "find.inFile": ["Meta+F"],
+  "agents.findInConversation": ["Meta+F"],
   "find.replaceInFile": ["Meta+R"],
   "find.next": ["Meta+G"],
   "find.previous": ["Meta+Shift+G"],

src/platform/keymaps/intellij-windows.ts

@@ -62,6 +62,7 @@ export const intellijWindows: Record<string, string[]> = {
 
   // Find
   "find.inFile": ["Ctrl+F"],
+  "agents.findInConversation": ["Ctrl+F"],
   "find.replaceInFile": ["Ctrl+R"],
   "find.next": ["F3", "Ctrl+L"],
   "find.previous": ["Shift+F3", "Ctrl+Shift+L"],

src/platform/keymaps/vscode-macos.ts

@@ -62,6 +62,7 @@ export const vscodeMacos: Record<string, string[]> = {
 
   // Find
   "find.inFile": ["Meta+F"],
+  "agents.findInConversation": ["Meta+F"],
   "find.replaceInFile": ["Meta+Alt+F"],
   "find.next": ["Meta+G"],
   "find.previous": ["Meta+Shift+G"],

src/platform/locales/text/zh.json

@@ -4190,5 +4190,14 @@
   "Starting the IDE backend…": "正在启动 IDE 后端…",
   "Opening the project…": "正在打开项目…",
   "Cannot load agent tasks": "无法加载智能体任务",
-  "Opening {name}…": "正在打开 {name}…"
+  "Opening {name}…": "正在打开 {name}…",
+  "Copy Code": "复制代码",
+  "Jump to Bottom": "跳到底部",
+  "Quote": "引用",
+  "Find in Conversation": "在对话中查找",
+  "Find in conversation": "在对话中查找",
+  "0 results": "0 个结果",
+  "Time the agent took to answer": "智能体回答所用的时间",
+  "Edit and Resend": "编辑后重新发送",
+  "Send Again": "再次发送"
 }