diff --git a/src/hooks/workspace.ts b/src/hooks/workspace.ts
index 7b86d9d23c8..32bb903f909 100644
--- a/src/hooks/workspace.ts
+++ b/src/hooks/workspace.ts
@@ -81,11 +81,19 @@ function loadHookFromDir(params: {
   nameHint?: string;
 }): Hook | null {
   const hookMdPath = path.join(params.hookDir, "HOOK.md");
-  const content = readBoundaryFileUtf8({
+  const safeHookMdPath = resolveBoundaryFilePath({
     absolutePath: hookMdPath,
     rootPath: params.hookDir,
     boundaryLabel: "hook directory",
   });
+  if (!safeHookMdPath) {
+    return null;
+  }
+  const content = readBoundaryFileUtf8({
+    absolutePath: safeHookMdPath,
+    rootPath: params.hookDir,
+    boundaryLabel: "hook directory",
+  });
   if (content === null) {
     return null;
   }
@@ -127,7 +135,7 @@ function loadHookFromDir(params: {
       description,
       source: params.source,
       pluginId: params.pluginId,
-      filePath: hookMdPath,
+      filePath: safeHookMdPath,
       baseDir,
       handlerPath,
     };