diff --git a/src/hooks/comment-checker/cli.ts b/src/hooks/comment-checker/cli.ts
index ee6d382..2b938c2 100644
--- a/src/hooks/comment-checker/cli.ts
+++ b/src/hooks/comment-checker/cli.ts
@@ -23,6 +23,19 @@ function getBinaryName(): string {
 function findCommentCheckerPathSync(): string | null {
   const binaryName = getBinaryName()
 
+  // Check cached binary first (safest path - no module resolution needed)
+  const cachedPath = getCachedBinaryPath()
+  if (cachedPath) {
+    debugLog("found binary in cache:", cachedPath)
+    return cachedPath
+  }
+
+  // Guard against undefined import.meta.url (can happen on Windows during plugin loading)
+  if (!import.meta.url) {
+    debugLog("import.meta.url is undefined, skipping package resolution")
+    return null
+  }
+
   try {
     const require = createRequire(import.meta.url)
     const cliPkgPath = require.resolve("@code-yeongyu/comment-checker/package.json")
@@ -33,14 +46,8 @@ function findCommentCheckerPathSync(): string | null {
       debugLog("found binary in main package:", binaryPath)
       return binaryPath
     }
-  } catch {
-    debugLog("main package not installed")
-  }
-
-  const cachedPath = getCachedBinaryPath()
-  if (cachedPath) {
-    debugLog("found binary in cache:", cachedPath)
-    return cachedPath
+  } catch (err) {
+    debugLog("main package not installed or resolution failed:", err)
   }
 
   debugLog("no binary found in known locations")
diff --git a/src/hooks/comment-checker/downloader.ts b/src/hooks/comment-checker/downloader.ts
index 81646a4..c260c4e 100644
--- a/src/hooks/comment-checker/downloader.ts
+++ b/src/hooks/comment-checker/downloader.ts
@@ -32,9 +32,16 @@ const PLATFORM_MAP: Record<string, PlatformInfo> = {
 
 /**
  * Get the cache directory for oh-my-opencode binaries.
- * Follows XDG Base Directory Specification.
+ * On Windows: Uses %LOCALAPPDATA% or %APPDATA% (Windows conventions)
+ * On Unix: Follows XDG Base Directory Specification
  */
 export function getCacheDir(): string {
+  if (process.platform === "win32") {
+    const localAppData = process.env.LOCALAPPDATA || process.env.APPDATA
+    const base = localAppData || join(homedir(), "AppData", "Local")
+    return join(base, "oh-my-opencode", "bin")
+  }
+
   const xdgCache = process.env.XDG_CACHE_HOME
   const base = xdgCache || join(homedir(), ".cache")
   return join(base, "oh-my-opencode", "bin")