diff --git a/web/workspace/src/lib/workspace/console/run-status.test.ts b/web/workspace/src/lib/workspace/console/run-status.test.ts
index e0d990471..998009b61 100644
--- a/web/workspace/src/lib/workspace/console/run-status.test.ts
+++ b/web/workspace/src/lib/workspace/console/run-status.test.ts
@@ -5,6 +5,7 @@ import {
   formatRunElapsed,
   formatRunElapsedCompact,
   formatRunTokens,
+  visibleCompactionProgress,
 } from "./run-status.ts";
 
 function assertEquals(actual: unknown, expected: unknown): void {
@@ -98,3 +99,42 @@ Deno.test("run status formatting matches the compact TUI shape", () => {
   assertEquals(formatRunTokens(3_000), "3.0k");
   assertEquals(formatRunTokens(999), "999");
 });
+
+Deno.test("visible compaction requires a matching busy worker state", () => {
+  const manual = {
+    phase: "preparing",
+    started_at_ms: 1_700_000_000_000,
+    trigger: "manual",
+  } as const;
+  const automatic = {
+    phase: "summarizing",
+    started_at_ms: 1_700_000_000_000,
+    trigger: "request_threshold",
+  } as const;
+  const maintenance = {
+    last_command_id: 7,
+    state: {
+      kind: "busy",
+      state: { kind: "maintenance", state: "compacting" },
+    },
+  } as const;
+  const run = {
+    last_command_id: 7,
+    state: {
+      kind: "busy",
+      state: { kind: "run", state: "running" },
+    },
+  } as const;
+  const idle = {
+    last_command_id: 7,
+    state: { kind: "idle" },
+  } as const;
+
+  assertEquals(visibleCompactionProgress(manual, maintenance), manual);
+  assertEquals(visibleCompactionProgress(automatic, run), automatic);
+  assertEquals(visibleCompactionProgress(manual, run), null);
+  assertEquals(visibleCompactionProgress(automatic, maintenance), null);
+  assertEquals(visibleCompactionProgress(manual, idle), null);
+  assertEquals(visibleCompactionProgress(manual, null), null);
+  assertEquals(visibleCompactionProgress(null, maintenance), null);
+});
diff --git a/web/workspace/src/lib/workspace/console/run-status.ts b/web/workspace/src/lib/workspace/console/run-status.ts
index 37495dc1c..326694e97 100644
--- a/web/workspace/src/lib/workspace/console/run-status.ts
+++ b/web/workspace/src/lib/workspace/console/run-status.ts
@@ -1,4 +1,8 @@
-import type { Event as ProtocolEvent } from "$lib/generated/protocol";
+import type {
+  Event as ProtocolEvent,
+  InFlightCompaction,
+  WorkerStateSnapshot,
+} from "$lib/generated/protocol";
 
 export type RunActivityStats = {
   startedAtMs: number | null;
@@ -71,3 +75,20 @@ export function formatRunTokens(tokens: number): string {
   if (tokens >= 1_000) return `${(tokens / 1_000).toFixed(1)}k`;
   return String(tokens);
 }
+
+export function visibleCompactionProgress(
+  compaction: InFlightCompaction | null,
+  workerState: WorkerStateSnapshot | null,
+): InFlightCompaction | null {
+  if (!compaction || workerState?.state.kind !== "busy") {
+    return null;
+  }
+
+  const busyState = workerState.state.state;
+  const triggerMatches = compaction.trigger === "manual"
+    ? busyState.kind === "maintenance" &&
+      busyState.state === "compacting"
+    : busyState.kind === "run";
+
+  return triggerMatches ? compaction : null;
+}
diff --git a/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts b/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts
index 3b6629ae9..c39f231a9 100644
--- a/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts
+++ b/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts
@@ -1116,3 +1116,28 @@ Deno.test("Web Console uses Notify while running and exposes durable pending con
     "ordinary text must remain Submit instead of being implicitly converted to Notify",
   );
 });
+
+Deno.test("Web Console gates compaction progress before rendering run status", async () => {
+  const consolePage = await Deno.readTextFile(
+    new URL(
+      "./../../../routes/w/[workspaceId]/workers/[workerRef]/console/+page.svelte",
+      import.meta.url,
+    ),
+  );
+  const runStatus = await Deno.readTextFile(
+    new URL("./WorkerRunStatus.svelte", import.meta.url),
+  );
+
+  assert(
+    consolePage.includes("visibleCompactionProgress(") &&
+      consolePage.includes("consoleProjection.compaction") &&
+      consolePage.includes("consoleProjection.workerState") &&
+      consolePage.includes("compaction={compactionProgress}"),
+    "Console page should pass only state-consistent compaction progress to the status component",
+  );
+  assert(
+    runStatus.includes("compaction?.started_at_ms ?? startedAtMs") &&
+      runStatus.includes("Compacting · {compaction.phase}"),
+    "run status should render the compaction phase and derive elapsed time from the authoritative start timestamp",
+  );
+});
diff --git a/web/workspace/src/routes/w/[workspaceId]/workers/[workerRef]/console/+page.svelte b/web/workspace/src/routes/w/[workspaceId]/workers/[workerRef]/console/+page.svelte
index 28f3cbd35..b9ba03797 100644
--- a/web/workspace/src/routes/w/[workspaceId]/workers/[workerRef]/console/+page.svelte
+++ b/web/workspace/src/routes/w/[workspaceId]/workers/[workerRef]/console/+page.svelte
@@ -21,6 +21,7 @@
         type ComposerCompletionToken,
     } from "$lib/workspace/console/composer-completion";
     import WorkerRunStatus from "$lib/workspace/console/WorkerRunStatus.svelte";
+    import { visibleCompactionProgress } from "$lib/workspace/console/run-status";
     import { resolveWorkerControlShortcut } from "$lib/workspace/console/worker-control-shortcuts";
     import {
         consoleWorkerViews,
@@ -248,18 +249,12 @@
         liveWorkerState ?? (worker?.state === "stopped" ? "stopped" : "loading"),
     );
     const workerRunning = $derived(workerState === "running");
-    const compactionProgress = $derived.by(() => {
-        const state = consoleProjection.workerState?.state;
-        if (!state || typeof state !== "object" || !("busy" in state)) return null;
-        const progress = consoleProjection.compaction;
-        if (!progress) return null;
-        const busy = state.busy;
-        if (!busy || typeof busy !== "object") return null;
-        const valid = progress.trigger === "manual"
-            ? "maintenance" in busy && busy.maintenance === "compacting"
-            : "run" in busy;
-        return valid ? progress : null;
-    });
+    const compactionProgress = $derived(
+        visibleCompactionProgress(
+            consoleProjection.compaction,
+            consoleProjection.workerState,
+        ),
+    );
     const workerPaused = $derived(workerState === "paused");
     const composerEditable = $derived(protocolState === "open" && !sending);
     const draftHasText = $derived(draft.content.trim().length > 0);