feat(web): surface provider rate limit usage in composer

apps/server/src/orchestration/Layers/ProviderRuntimeIngestion.ts

@@ -493,6 +493,21 @@ function runtimeEventToActivities(
       ];
     }
 
+    case "account.rate-limits.updated": {
+      return [
+        {
+          id: event.eventId,
+          createdAt: event.createdAt,
+          tone: "info",
+          kind: "account.rate-limits.updated",
+          summary: "Account rate limits updated",
+          payload: event.payload.rateLimits,
+          turnId: toTurnId(event.turnId) ?? null,
+          ...maybeSequence,
+        },
+      ];
+    }
+
     case "item.updated": {
       if (!isToolLifecycleItemType(event.payload.itemType)) {
         return [];

apps/web/src/components/chat/ChatComposer.tsx

@@ -76,6 +76,7 @@ import {
   renderProviderTraitsPicker,
 } from "./composerProviderState";
 import { ContextWindowMeter } from "./ContextWindowMeter";
+import { ProviderUsageMeter } from "./ProviderUsageMeter";
 import { buildExpandedImagePreview, type ExpandedImagePreview } from "./ExpandedImagePreview";
 import { basenameOfPath } from "../../vscode-icons";
 import { cn, randomUUID } from "~/lib/utils";
@@ -105,6 +106,7 @@ import type { SessionPhase, Thread } from "../../types";
 import type { PendingUserInputDraftAnswer } from "../../pendingUserInput";
 import type { PendingApproval, PendingUserInput } from "../../session-logic";
 import { deriveLatestContextWindowSnapshot } from "../../lib/contextWindow";
+import { deriveLatestProviderUsageSnapshot } from "../../lib/providerUsage";
 import { formatProviderSkillDisplayName } from "../../providerSkillPresentation";
 import { searchProviderSkills } from "../../providerSkillSearch";
 
@@ -273,6 +275,7 @@ const ComposerFooterModeControls = memo(function ComposerFooterModeControls(prop
 const ComposerFooterPrimaryActions = memo(function ComposerFooterPrimaryActions(props: {
   compact: boolean;
   activeContextWindow: ReturnType<typeof deriveLatestContextWindowSnapshot>;
+  activeProviderUsage: ReturnType<typeof deriveLatestProviderUsageSnapshot>;
   isPreparingWorktree: boolean;
   pendingAction: {
     questionIndex: number;
@@ -293,6 +296,7 @@ const ComposerFooterPrimaryActions = memo(function ComposerFooterPrimaryActions(
 }) {
   return (
     <>
+      {props.activeProviderUsage ? <ProviderUsageMeter usage={props.activeProviderUsage} /> : null}
       {props.activeContextWindow ? <ContextWindowMeter usage={props.activeContextWindow} /> : null}
       {props.isPreparingWorktree ? (
         <span className="text-muted-foreground/70 text-xs">Preparing worktree...</span>
@@ -648,6 +652,14 @@ export const ChatComposer = memo(
       [activeThreadActivities],
     );
 
+    // ------------------------------------------------------------------
+    // Provider usage (rate limits / session %)
+    // ------------------------------------------------------------------
+    const activeProviderUsage = useMemo(
+      () => deriveLatestProviderUsageSnapshot(activeThreadActivities ?? []),
+      [activeThreadActivities],
+    );
+
     // ------------------------------------------------------------------
     // Composer-local state
     // ------------------------------------------------------------------
@@ -1962,6 +1974,7 @@ export const ChatComposer = memo(
                   <ComposerFooterPrimaryActions
                     compact={isComposerPrimaryActionsCompact}
                     activeContextWindow={activeContextWindow}
+                    activeProviderUsage={activeProviderUsage}
                     pendingAction={pendingPrimaryAction}
                     isRunning={phase === "running"}
                     showPlanFollowUpPrompt={

apps/web/src/components/chat/ProviderUsageMeter.tsx

@@ -0,0 +1,101 @@
+import { type ProviderUsageSnapshot } from "~/lib/providerUsage";
+import { Popover, PopoverPopup, PopoverTrigger } from "../ui/popover";
+
+function formatResetTime(resetsAt: number | null): string | null {
+  if (resetsAt === null) {
+    return null;
+  }
+  const date = new Date(resetsAt * 1000);
+  return `Resets ${date.toLocaleDateString(undefined, {
+    month: "short",
+    day: "numeric",
+  })}, ${date.toLocaleTimeString(undefined, {
+    hour: "numeric",
+    minute: "2-digit",
+    timeZoneName: "short",
+  })}`;
+}
+
+function UsageBar(props: { percent: number; status: "ok" | "warning" | "rejected" }) {
+  const barColor =
+    props.status === "rejected" || props.percent >= 90
+      ? "bg-red-500"
+      : props.status === "warning" || props.percent >= 70
+        ? "bg-amber-500"
+        : "bg-rose-500";
+
+  return (
+    <div className="relative h-1.5 w-full overflow-hidden rounded-full bg-muted/50">
+      <div
+        className={`absolute inset-y-0 left-0 rounded-full transition-[width] duration-500 ease-out ${barColor}`}
+        style={{ width: `${Math.min(100, Math.max(0, props.percent))}%` }}
+      />
+    </div>
+  );
+}
+
+function BarGraphIcon(props: { status: "ok" | "warning" | "rejected" }) {
+  const barColor =
+    props.status === "rejected"
+      ? "var(--color-destructive)"
+      : props.status === "warning"
+        ? "var(--color-warning, #f59e0b)"
+        : "var(--color-muted-foreground)";
+
+  return (
+    <svg viewBox="0 0 24 24" fill="none" className="h-4 w-4" aria-hidden="true">
+      <rect x="4" y="13" width="4" height="7" rx="1" fill={barColor} opacity={0.6} />
+      <rect x="10" y="8" width="4" height="12" rx="1" fill={barColor} opacity={0.8} />
+      <rect x="16" y="4" width="4" height="16" rx="1" fill={barColor} />
+    </svg>
+  );
+}
+
+export function ProviderUsageMeter(props: { usage: ProviderUsageSnapshot }) {
+  const { usage } = props;
+  const maxPercent = Math.max(...usage.windows.map((w) => w.usedPercent), 0);
+
+  return (
+    <Popover>
+      <PopoverTrigger
+        openOnHover
+        delay={150}
+        closeDelay={0}
+        render={
+          <button
+            type="button"
+            className="group inline-flex items-center justify-center rounded-full p-0.5 transition-opacity hover:opacity-85"
+            aria-label={`${usage.providerLabel} usage: ${Math.round(maxPercent)}%`}
+          >
+            <BarGraphIcon status={usage.status} />
+          </button>
+        }
+      />
+      <PopoverPopup tooltipStyle side="top" align="end" className="w-64 max-w-none px-4 py-3">
+        <div className="space-y-3">
+          <div className="text-[11px] font-medium uppercase tracking-[0.08em] text-muted-foreground">
+            {usage.providerLabel}
+          </div>
+
+          {usage.windows.map((window) => {
+            const resetText = formatResetTime(window.resetsAt);
+            return (
+              <div key={window.label} className="space-y-1.5">
+                <div className="flex items-baseline justify-between">
+                  <span className="text-xs font-semibold text-foreground">{window.label}</span>
+                  <span className="text-xs font-semibold text-foreground">
+                    {Math.round(window.usedPercent)}%
+                  </span>
+                </div>
+                <UsageBar percent={window.usedPercent} status={usage.status} />
+                {resetText ? (
+                  <div className="text-[11px] text-muted-foreground">{resetText}</div>
+                ) : null}
+              </div>
+            );
+          })}
+        </div>
+      </PopoverPopup>
+    </Popover>
+  );
+}