diff --git a/.jules/bolt.md b/.jules/bolt.md
new file mode 100644
index 0000000..f6112e6
--- /dev/null
+++ b/.jules/bolt.md
@@ -0,0 +1,5 @@
+# Bolt's Journal
+
+## 2025-02-17 - Global process.platform Interleaving in Concurrent Testing
+**Learning:** Redefining global state properties like `process.platform` in async/concurrent test suites causes state pollution and race conditions across test blocks. In Bun, concurrent test execution means async describes/its yield control, causing different platform-based mock suites to run concurrently and override the shared `process.platform` back and forth.
+**Action:** Isolate mock configurations inside test execution contexts or run tests using strict serial execution (or stub process/platform on a per-function dependency injection basis) rather than mutating global/process-level state.
diff --git a/packages/mcp/src/shared/list-files-response.ts b/packages/mcp/src/shared/list-files-response.ts
index d70221d..a39ff07 100644
--- a/packages/mcp/src/shared/list-files-response.ts
+++ b/packages/mcp/src/shared/list-files-response.ts
@@ -438,6 +438,11 @@ function longestPathLength(entries: LeanRepoFileEntry[]): number {
   return max;
 }
 
+/**
+ * Optimized padding using native `String.prototype.padEnd`.
+ * Built-in native implementation in C++ is faster and more efficient
+ * than manually concatenating strings via `repeat` inside loops.
+ */
 function padRight(text: string, width: number): string {
-  return text.length >= width ? text : text + " ".repeat(width - text.length);
+  return text.padEnd(width);
 }