feat: expand thread workflows and provider reliability

apps/web/src/addons/terminal-shell/index.test.tsx

@@ -0,0 +1,32 @@
+import { renderToStaticMarkup } from "react-dom/server";
+import { describe, expect, it } from "vite-plus/test";
+
+import { TerminalShellStatus, terminalShellRootProps } from ".";
+
+describe("terminal shell addon", () => {
+  it("exposes a stable host hook for its scoped styles", () => {
+    expect(terminalShellRootProps["data-terminal-shell"]).toBe("true");
+    expect(terminalShellRootProps.className).toContain("terminal-shell");
+  });
+
+  it("renders ready status without working-only controls", () => {
+    const markup = renderToStaticMarkup(
+      <TerminalShellStatus activeTerminalCount={0} isWorking={false} workingStepLabel={null} />,
+    );
+
+    expect(markup).toContain("Ready");
+    expect(markup).not.toContain("esc to interrupt");
+    expect(markup).not.toContain("terminal active");
+  });
+
+  it("renders working status and pluralizes active terminals", () => {
+    const markup = renderToStaticMarkup(
+      <TerminalShellStatus activeTerminalCount={2} isWorking workingStepLabel="Running command" />,
+    );
+
+    expect(markup).toContain('data-terminal-shell-status-state="working"');
+    expect(markup).toContain("Running command");
+    expect(markup).toContain("esc to interrupt");
+    expect(markup).toContain("2 terminals active");
+  });
+});

apps/web/src/addons/terminal-shell/index.tsx

@@ -0,0 +1,34 @@
+export const terminalShellRootProps = {
+  className: "terminal-shell relative flex min-h-0 min-w-0 flex-1 overflow-hidden bg-background",
+  "data-terminal-shell": "true",
+} as const;
+
+export type TerminalShellStatusProps = {
+  readonly isWorking: boolean;
+  readonly workingStepLabel: string | null;
+  readonly activeTerminalCount: number;
+};
+
+export function TerminalShellStatus({
+  isWorking,
+  workingStepLabel,
+  activeTerminalCount,
+}: TerminalShellStatusProps) {
+  return (
+    <div
+      aria-live="polite"
+      className="flex items-center gap-2 px-1 pb-1.5 text-[11px] text-muted-foreground"
+      data-terminal-shell-status="true"
+    >
+      <span data-terminal-shell-status-state={isWorking ? "working" : "ready"}>
+        {isWorking ? (workingStepLabel ?? "Working") : "Ready"}
+      </span>
+      {isWorking ? <span aria-hidden="true">· esc to interrupt</span> : null}
+      {activeTerminalCount > 0 ? (
+        <span>
+          · {activeTerminalCount} terminal{activeTerminalCount === 1 ? "" : "s"} active
+        </span>
+      ) : null}
+    </div>
+  );
+}

apps/web/src/addons/terminal-shell/terminal-shell.css

@@ -0,0 +1,187 @@
+/* Fork-local presentation addon. Keep its selectors scoped to the host hook so
+   upstream chat markup remains the source of truth. */
+[data-terminal-shell="true"] {
+  --terminal-shell-background: #11161d;
+  --terminal-shell-surface: #1b2230;
+  --terminal-shell-border: rgb(255 255 255 / 9%);
+  --terminal-shell-muted: #8f9aa8;
+  --terminal-shell-foreground: #e6e9ed;
+  --terminal-shell-accent: #52e7d1;
+  --terminal-shell-selection: rgb(82 231 209 / 18%);
+  background: var(--terminal-shell-background);
+  color: var(--terminal-shell-foreground);
+  font-family: var(--font-mono);
+}
+
+[data-terminal-shell="true"] [data-chat-header] {
+  min-height: 2.75rem;
+  border-bottom: 1px solid var(--terminal-shell-border);
+  background: var(--terminal-shell-background);
+  color: var(--terminal-shell-muted);
+  font-family: var(--font-mono);
+}
+
+[data-terminal-shell="true"] [data-chat-header] h2,
+[data-terminal-shell="true"] [data-chat-header] button,
+[data-terminal-shell="true"] [data-chat-header] [data-project-favicon] {
+  font-family: var(--font-mono);
+}
+
+[data-terminal-shell="true"] [data-chat-workspace-drop-target="true"] {
+  background: var(--terminal-shell-background);
+}
+
+[data-terminal-shell="true"] [data-timeline-root="true"] {
+  max-width: none;
+  padding-inline: clamp(1rem, 4vw, 4rem);
+  font-family: var(--font-mono);
+  font-size: 0.9375rem;
+  line-height: 1.55;
+}
+
+[data-terminal-shell="true"] [data-timeline-row-kind="message"] {
+  padding-block: 0.35rem;
+}
+
+[data-terminal-shell="true"] [data-message-role="assistant"] > div {
+  padding-inline: 0;
+}
+
+[data-terminal-shell="true"] [data-message-role="user"] > .group {
+  align-items: flex-start;
+  gap: 0;
+}
+
+[data-terminal-shell="true"] [data-message-role="user"] > .group > div:first-child {
+  max-width: none;
+  border: 0;
+  border-radius: 0;
+  background: transparent;
+  padding: 0;
+  color: var(--terminal-shell-foreground);
+}
+
+[data-terminal-shell="true"] [data-message-role="user"] > .group > div:first-child::before {
+  margin-inline-end: 0.75rem;
+  color: var(--terminal-shell-accent);
+  content: ">";
+  line-height: 1.55;
+}
+
+[data-terminal-shell="true"] [data-message-role="user"] [data-user-message-footer="true"] {
+  max-width: none;
+  justify-content: flex-start;
+  padding-inline-start: 1.5rem;
+  color: var(--terminal-shell-muted);
+}
+
+[data-terminal-shell="true"] [data-message-role="assistant"] a,
+[data-terminal-shell="true"] [data-message-role="assistant"] code,
+[data-terminal-shell="true"] [data-message-role="user"] code {
+  color: var(--terminal-shell-accent);
+}
+
+[data-terminal-shell="true"] [data-message-role="assistant"] a {
+  text-decoration-color: color-mix(in srgb, var(--terminal-shell-accent) 65%, transparent);
+}
+
+[data-terminal-shell="true"] [data-message-role="assistant"] pre,
+[data-terminal-shell="true"] [data-message-role="user"] pre {
+  border-color: var(--terminal-shell-border);
+  border-radius: 2px;
+  background: rgb(0 0 0 / 22%);
+}
+
+[data-terminal-shell="true"] .chat-composer-glass-shell {
+  --chat-composer-glass-surface: var(--terminal-shell-surface);
+  --chat-composer-outline: var(--terminal-shell-border);
+  max-width: none;
+}
+
+[data-terminal-shell="true"] .chat-composer-glass-shell::before,
+[data-terminal-shell="true"] .chat-composer-glass-host::after {
+  border-radius: 3px;
+}
+
+[data-terminal-shell="true"] .chat-composer-glass-shell::before {
+  background: var(--terminal-shell-surface);
+  box-shadow: 0 -14px 34px -28px rgb(0 0 0 / 80%);
+}
+
+[data-terminal-shell="true"] .chat-composer-glass-host,
+[data-terminal-shell="true"] [data-chat-composer-main-surface="true"],
+[data-terminal-shell="true"] [data-chat-composer-surface="true"] {
+  border-radius: 3px;
+}
+
+[data-terminal-shell="true"] [data-chat-composer-form="true"] {
+  max-width: none;
+}
+
+[data-terminal-shell="true"] [data-chat-composer-main-surface="true"] {
+  border: 1px solid var(--terminal-shell-border);
+  background: var(--terminal-shell-surface);
+  box-shadow: none;
+}
+
+[data-terminal-shell="true"] [data-chat-composer-surface="true"] {
+  background: transparent;
+}
+
+[data-terminal-shell="true"] [data-testid="composer-editor"] {
+  min-height: 3.5rem;
+  padding-block: 0.15rem;
+  font-family: var(--font-mono);
+  font-size: 0.9375rem;
+  line-height: 1.55;
+  caret-color: var(--terminal-shell-accent);
+}
+
+[data-terminal-shell="true"] [data-testid="composer-editor"]::selection {
+  background: var(--terminal-shell-selection);
+}
+
+[data-terminal-shell="true"] [data-chat-composer-main-surface="true"] button:hover {
+  background: rgb(255 255 255 / 7%);
+}
+
+[data-terminal-shell="true"] [data-chat-composer-overlay] {
+  background: linear-gradient(to top, var(--terminal-shell-background) 0%, transparent 100%);
+  padding-top: 1.5rem;
+}
+
+[data-terminal-shell="true"] [data-terminal-shell-status="true"] {
+  font-family: var(--font-mono);
+  letter-spacing: 0.01em;
+}
+
+[data-terminal-shell="true"] [data-terminal-shell-status-state] {
+  color: var(--terminal-shell-muted);
+}
+
+[data-terminal-shell="true"] [data-terminal-shell-status-state]::before {
+  display: inline-block;
+  width: 0.5rem;
+  height: 0.5rem;
+  margin-inline-end: 0.5rem;
+  border-radius: 999px;
+  background: var(--terminal-shell-muted);
+  content: "";
+  vertical-align: 0.03em;
+}
+
+[data-terminal-shell="true"] [data-terminal-shell-status-state="working"] {
+  color: var(--terminal-shell-accent);
+}
+
+[data-terminal-shell="true"] [data-terminal-shell-status-state="working"]::before {
+  background: var(--terminal-shell-accent);
+  box-shadow: 0 0 0 3px rgb(82 231 209 / 10%);
+}
+
+@media (max-width: 639px) {
+  [data-terminal-shell="true"] [data-timeline-root="true"] {
+    padding-inline: 1rem;
+    font-size: 0.875rem;
+  }
+}

apps/web/src/components/ChatView.tsx

@@ -255,6 +255,7 @@ import {
 } from "../state/server";
 import { terminalEnvironment } from "../state/terminal";
 import { threadEnvironment, useEnvironmentThread } from "../state/threads";
+import { TerminalShellStatus, terminalShellRootProps } from "../addons/terminal-shell";
 import {
   requestOlderThreadTurns,
   threadHasOlderTurns,
@@ -4167,6 +4168,20 @@ function ChatViewContent(props: ChatViewProps) {
     };
   }, [activeThread?.id, timelineEntries, getActiveTimelineTurnMetrics]);
 
+  useEffect(() => {
+    if (!activeThread?.id || !latestTurnSettled) {
+      return;
+    }
+    if (timelineScrollModeRef.current !== "anchoring-new-turn") {
+      return;
+    }
+
+    // The extra tail is only useful while the first response is streaming.
+    // Once that turn settles, remove it and return to the real end of the chat
+    // so a long thread cannot leave a large empty region below its last row.
+    scrollToEnd();
+  }, [activeThread?.id, latestTurnSettled, scrollToEnd]);
+
   useEffect(() => {
     setPullRequestDialogState(null);
     isAtEndRef.current = true;
@@ -6568,7 +6583,7 @@ function ChatViewContent(props: ChatViewProps) {
     composerBannerItems.length > 0 || Boolean(threadSyncPhase && !activeEnvironmentUnavailable);
 
   return (
-    <div className="relative flex min-h-0 min-w-0 flex-1 overflow-hidden bg-background">
+    <div {...terminalShellRootProps}>
       {rightPanelOpen && !shouldUseRightPanelSheet ? panelLayoutControls : null}
       <div
         className={cn(
@@ -6728,6 +6743,13 @@ function ChatViewContent(props: ChatViewProps) {
                 className="w-full ps-[calc(env(safe-area-inset-left)+0.75rem)] pe-[calc(env(safe-area-inset-right)+0.75rem)] sm:ps-[calc(env(safe-area-inset-left)+1.25rem)] sm:pe-[calc(env(safe-area-inset-right)+1.25rem)]"
               >
                 <div className="pointer-events-auto relative z-10">
+                  {!isDraftHeroState ? (
+                    <TerminalShellStatus
+                      activeTerminalCount={terminalUiState.terminalIds.length}
+                      isWorking={isWorking}
+                      workingStepLabel={workingStepLabel}
+                    />
+                  ) : null}
                   {isDraftHeroState ? (
                     <div className="absolute inset-x-0 bottom-full z-0">
                       <div