diff --git a/docs/release-control/v6/internal/subsystems/patrol-intelligence.md b/docs/release-control/v6/internal/subsystems/patrol-intelligence.md
index 25d52495f..3ba658351 100644
--- a/docs/release-control/v6/internal/subsystems/patrol-intelligence.md
+++ b/docs/release-control/v6/internal/subsystems/patrol-intelligence.md
@@ -296,6 +296,11 @@ That same rule applies to run-status badges. A legacy run without findings
 snapshot ids must not keep a green `healthy` badge when the surrounding UI is
 saying findings verification is unavailable; the canonical run-status
 presentation should downgrade that state to a neutral `completed` badge.
+That same truthfulness rule applies to the run-history shell copy. The `Recent
+patrol runs` helper text must not promise that every visible run can filter
+findings to a concrete snapshot; when visible runs include legacy entries
+without `finding_ids`, or when the selected run itself predates findings
+snapshots, the shell should say so explicitly.
 That same findings surface should keep its section chrome functional rather
 than promotional. Inside the Patrol findings tab, the selected tab already
 names the surface, so the findings card should not add another in-card product
diff --git a/frontend-modern/src/components/patrol/RunHistoryPanel.tsx b/frontend-modern/src/components/patrol/RunHistoryPanel.tsx
index 93e2effae..54dc7f177 100644
--- a/frontend-modern/src/components/patrol/RunHistoryPanel.tsx
+++ b/frontend-modern/src/components/patrol/RunHistoryPanel.tsx
@@ -2,7 +2,10 @@ import { For, Show } from 'solid-js';
 import type { Accessor } from 'solid-js';
 import type { PatrolRunRecord } from '@/api/patrol';
 import { getRunHistoryEmptyState } from '@/utils/patrolEmptyStatePresentation';
-import { getRunHistoryLoadingState } from '@/utils/patrolRunPresentation';
+import {
+  getRunHistoryLoadingState,
+  getRunHistorySelectionHint,
+} from '@/utils/patrolRunPresentation';
 import { RunHistoryEntry } from './RunHistoryEntry';
 
 import RefreshCwIcon from 'lucide-solid/icons/refresh-cw';
@@ -35,7 +38,9 @@ export function RunHistoryPanel(props: RunHistoryPanelProps) {
       <div class="flex items-center justify-between mb-4">
         <div>
           <h2 class="text-sm font-semibold text-base-content">Recent patrol runs</h2>
-          <p class="text-xs text-muted">Select a run to filter findings to that snapshot</p>
+          <p class="text-xs text-muted">
+            {getRunHistorySelectionHint(props.runs, props.selectedRun)}
+          </p>
         </div>
         <Show when={props.selectedRun}>
           <button
diff --git a/frontend-modern/src/components/patrol/__tests__/RunHistoryPanel.test.tsx b/frontend-modern/src/components/patrol/__tests__/RunHistoryPanel.test.tsx
new file mode 100644
index 000000000..38bc9eae8
--- /dev/null
+++ b/frontend-modern/src/components/patrol/__tests__/RunHistoryPanel.test.tsx
@@ -0,0 +1,98 @@
+import { cleanup, render, screen } from '@solidjs/testing-library';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import type { PatrolRunRecord } from '@/api/patrol';
+import { RunHistoryPanel } from '../RunHistoryPanel';
+
+vi.mock('../RunHistoryEntry', () => ({
+  RunHistoryEntry: () => <div data-testid="run-history-entry" />,
+}));
+
+describe('RunHistoryPanel', () => {
+  const patrolStream = {
+    phase: () => '',
+    currentTool: () => '',
+    tokens: () => 0,
+    resynced: () => false,
+    resyncReason: () => '',
+    bufferStartSeq: () => 0,
+    bufferEndSeq: () => 0,
+    outputTruncated: () => false,
+    reconnectCount: () => 0,
+    isStreaming: () => false,
+    errorMessage: () => '',
+  };
+
+  const baseRun: PatrolRunRecord = {
+    id: 'run-1',
+    started_at: '2026-03-12T10:00:00Z',
+    completed_at: '2026-03-12T10:01:00Z',
+    duration_ms: 60000,
+    type: 'patrol',
+    trigger_reason: 'scheduled',
+    scope_resource_ids: [],
+    effective_scope_resource_ids: [],
+    scope_resource_types: [],
+    resources_checked: 58,
+    nodes_checked: 0,
+    guests_checked: 0,
+    docker_checked: 0,
+    storage_checked: 0,
+    hosts_checked: 0,
+    pbs_checked: 0,
+    pmg_checked: 0,
+    kubernetes_checked: 0,
+    new_findings: 0,
+    existing_findings: 0,
+    rejected_findings: 0,
+    resolved_findings: 0,
+    auto_fix_count: 0,
+    findings_summary: 'All clear',
+    finding_ids: [],
+    error_count: 0,
+    status: 'healthy',
+    triage_flags: 0,
+    tool_call_count: 0,
+  };
+
+  afterEach(() => {
+    cleanup();
+  });
+
+  it('warns that some older runs do not include findings snapshots', () => {
+    render(() => (
+      <RunHistoryPanel
+        runs={[baseRun, { ...baseRun, id: 'run-legacy', finding_ids: undefined }]}
+        loading={false}
+        selectedRun={null}
+        onSelectRun={vi.fn()}
+        patrolStream={patrolStream}
+      />
+    ));
+
+    expect(
+      screen.getByText(
+        'Select a run to filter findings when available. Some older runs do not include findings snapshots.',
+      ),
+    ).toBeInTheDocument();
+  });
+
+  it('explains when the selected run predates findings snapshots', () => {
+    const legacyRun = { ...baseRun, id: 'run-legacy', finding_ids: undefined };
+
+    render(() => (
+      <RunHistoryPanel
+        runs={[legacyRun]}
+        loading={false}
+        selectedRun={legacyRun}
+        onSelectRun={vi.fn()}
+        patrolStream={patrolStream}
+      />
+    ));
+
+    expect(
+      screen.getByText(
+        'Selected run predates findings snapshots; run-scoped findings cannot be fully verified.',
+      ),
+    ).toBeInTheDocument();
+  });
+});
diff --git a/frontend-modern/src/utils/__tests__/patrolRunPresentation.test.ts b/frontend-modern/src/utils/__tests__/patrolRunPresentation.test.ts
index a7f5a836d..095214411 100644
--- a/frontend-modern/src/utils/__tests__/patrolRunPresentation.test.ts
+++ b/frontend-modern/src/utils/__tests__/patrolRunPresentation.test.ts
@@ -7,6 +7,7 @@ import {
   getPatrolRunStatusPresentation,
   isPatrolRunHealthy,
   getRunHistoryLoadingState,
+  getRunHistorySelectionHint,
   getToolCallsLoadingState,
   getToolCallsUnavailableState,
   getToolCallResultBadgeClass,
@@ -115,4 +116,23 @@ describe('patrolRunPresentation', () => {
     expect(getToolCallsLoadingState()).toBe('Loading tool calls...');
     expect(getToolCallsUnavailableState()).toBe('Tool call details not available for this run.');
   });
+
+  it('warns when visible runs include legacy findings snapshots', () => {
+    expect(
+      getRunHistorySelectionHint([
+        { finding_ids: [] },
+        { finding_ids: undefined },
+      ]),
+    ).toBe(
+      'Select a run to filter findings when available. Some older runs do not include findings snapshots.',
+    );
+  });
+
+  it('explains selected legacy runs in the run-history shell', () => {
+    expect(
+      getRunHistorySelectionHint([{ finding_ids: [] }], { finding_ids: undefined }),
+    ).toBe(
+      'Selected run predates findings snapshots; run-scoped findings cannot be fully verified.',
+    );
+  });
 });
diff --git a/frontend-modern/src/utils/patrolRunPresentation.ts b/frontend-modern/src/utils/patrolRunPresentation.ts
index 5f4555e78..00b2d166a 100644
--- a/frontend-modern/src/utils/patrolRunPresentation.ts
+++ b/frontend-modern/src/utils/patrolRunPresentation.ts
@@ -132,6 +132,21 @@ export function getRunHistoryLoadingState(): string {
   return 'Loading run history…';
 }
 
+export function getRunHistorySelectionHint(
+  runs: Array<Pick<PatrolRunRecord, 'finding_ids'>>,
+  selectedRun?: Pick<PatrolRunRecord, 'finding_ids'> | null,
+): string {
+  if (selectedRun && selectedRun.finding_ids === undefined) {
+    return 'Selected run predates findings snapshots; run-scoped findings cannot be fully verified.';
+  }
+
+  if (runs.some((run) => run.finding_ids === undefined)) {
+    return 'Select a run to filter findings when available. Some older runs do not include findings snapshots.';
+  }
+
+  return 'Select a run to filter findings to that snapshot';
+}
+
 export function getToolCallsLoadingState(): string {
   return 'Loading tool calls...';
 }