diff --git a/src/main/ai-vault/session-scanner-cursor-local-bounds.test.ts b/src/main/ai-vault/session-scanner-cursor-local-bounds.test.ts
index 17529e1e790..21bbe468adf 100644
--- a/src/main/ai-vault/session-scanner-cursor-local-bounds.test.ts
+++ b/src/main/ai-vault/session-scanner-cursor-local-bounds.test.ts
@@ -179,6 +179,52 @@ describe('local Cursor sidecar discovery bounds', () => {
     expect(result.truncated.buckets).toBe(true)
   })
 
+  it('keeps lowercase Windows scope buckets exact through the 64-path cap', async () => {
+    const root = await mkdtemp(join(tmpdir(), 'orca-cursor-win-scope-cap-'))
+    tempRoots.push(root)
+    const roots = isolatedScanRoots(root)
+    const scopePaths = Array.from(
+      { length: CURSOR_REMOTE_MAX_SCOPE_PATHS - 1 },
+      (_, index) => `c:\\workspaces\\repo-${String(index).padStart(3, '0')}`
+    )
+    let targetScope = ''
+    for (let index = 0; !targetScope; index += 1) {
+      const candidate = `c:\\workspaces\\target-${index}`
+      if (cursorBucketForCwd(candidate, 'win32').startsWith('f')) {
+        targetScope = candidate
+      }
+    }
+    scopePaths.push(targetScope)
+    const targetBucket = cursorBucketForCwd(targetScope, 'win32')
+    const targetMeta = await addSession(
+      roots.cursorChatsDir,
+      targetBucket,
+      'lowercase-drive-session'
+    )
+
+    await Promise.all(
+      Array.from({ length: CURSOR_REMOTE_MAX_BUCKETS }, (_, index) =>
+        mkdir(join(roots.cursorChatsDir, index.toString(16).padStart(32, '0')), {
+          recursive: true
+        })
+      )
+    )
+
+    const result = await scanAiVaultSessions({
+      ...roots,
+      platform: 'win32',
+      executionHostId: 'local',
+      scopePaths,
+      limit: 5
+    })
+
+    expect(result.sessions.some((session) => session.filePath === targetMeta)).toBe(true)
+    expect(result.sessions.find((session) => session.filePath === targetMeta)?.cwd).toBe(
+      targetScope
+    )
+    expect(result.issues.some((issue) => issue.message.includes('scope paths limit'))).toBe(false)
+  })
+
   it('detects scope-path truncation before applying the cap', async () => {
     const root = await mkdtemp(join(tmpdir(), 'orca-cursor-scope-trunc-'))
     tempRoots.push(root)
diff --git a/src/main/ai-vault/session-scanner-cursor-sources.ts b/src/main/ai-vault/session-scanner-cursor-sources.ts
index 65ef609d72a..d3d42eef6b0 100644
--- a/src/main/ai-vault/session-scanner-cursor-sources.ts
+++ b/src/main/ai-vault/session-scanner-cursor-sources.ts
@@ -3,6 +3,7 @@ import { join } from 'node:path'
 import type { AiVaultScanIssue } from '../../shared/ai-vault-types'
 import {
   cursorBucketForCwd,
+  cursorContextPathForHash,
   cursorLegacySlug,
   cursorSessionActivityMtimeMs,
   cursorScopeCwdCandidates,
@@ -71,16 +72,7 @@ async function discoverCursorSidecars(args: {
   issues: AiVaultScanIssue[]
 }): Promise<SessionFileDiscovery> {
   const startedAt = Date.now()
-  const rawScopePaths = args.options.scopePaths ?? []
-  // Detect truncation on the raw caller list before any conversion work/cap.
-  const scopePathsTruncated = rawScopePaths.length > CURSOR_SCOPE_PATH_LIMIT
-  const scopePaths = await localScopeCandidates({
-    ...args,
-    options: {
-      ...args.options,
-      scopePaths: rawScopePaths.slice(0, CURSOR_SCOPE_PATH_LIMIT)
-    }
-  })
+  const scopePaths = localSidecarScopeCandidates(args)
   let discovery
   try {
     discovery = await discoverLocalCursorSidecarsBounded({
@@ -112,17 +104,6 @@ async function discoverCursorSidecars(args: {
     ...discovery.counters,
     elapsedMs: Math.max(0, Date.now() - startedAt)
   }
-  const truncated = {
-    ...discovery.truncated,
-    scopePaths: discovery.truncated.scopePaths || scopePathsTruncated
-  }
-  if (scopePathsTruncated && !discovery.truncated.scopePaths) {
-    args.issues.push({
-      agent: 'cursor',
-      path: 'cursor sidecar scan',
-      message: 'Cursor sidecar scan truncated by the scope paths limit.'
-    })
-  }
   if (!discovery.rootRealPath) {
     return {
       agent: 'cursor',
@@ -131,7 +112,7 @@ async function discoverCursorSidecars(args: {
       cursorLayout: 'sidecar',
       cursorStorageContextKey: args.roots.storageContextKey,
       cursorDiscoveryCounters: counters,
-      cursorDiscoveryTruncated: truncated
+      cursorDiscoveryTruncated: discovery.truncated
     }
   }
 
@@ -152,7 +133,7 @@ async function discoverCursorSidecars(args: {
     cursorCwdEvidenceByPath: discovery.evidenceByPath,
     cursorExpectedRootRealPath: discovery.rootRealPath,
     cursorDiscoveryCounters: counters,
-    cursorDiscoveryTruncated: truncated
+    cursorDiscoveryTruncated: discovery.truncated
   }
 }
 
@@ -208,7 +189,7 @@ async function localScopeCandidates(args: {
   options: AiVaultScanOptions
 }): Promise<string[]> {
   const candidates = new Set<string>()
-  for (const scopePath of args.options.scopePaths ?? []) {
+  for (const scopePath of (args.options.scopePaths ?? []).slice(0, CURSOR_SCOPE_PATH_LIMIT)) {
     for (const cwd of cursorScopeCwdCandidates({
       scopePath,
       platform: args.roots.targetPlatform,
@@ -232,6 +213,24 @@ async function localScopeCandidates(args: {
   return [...candidates]
 }
 
+function localSidecarScopeCandidates(args: {
+  roots: CursorRootPair
+  options: AiVaultScanOptions
+}): string[] {
+  const candidates = new Set<string>()
+  for (const scopePath of args.options.scopePaths ?? []) {
+    const candidate = cursorContextPathForHash(
+      scopePath,
+      args.roots.storageContextKey,
+      args.roots.targetPlatform
+    )
+    if (candidate) {
+      candidates.add(candidate)
+    }
+  }
+  return [...candidates]
+}
+
 function dedupeFiles(files: readonly FileWithMtime[]): FileWithMtime[] {
   const byPath = new Map<string, FileWithMtime>()
   for (const file of files) {