diff --git a/.jules/sentinel.md b/.jules/sentinel.md
new file mode 100644
index 0000000..6f7d6e3
--- /dev/null
+++ b/.jules/sentinel.md
@@ -0,0 +1,4 @@
+## 2024-05-24 - Secure Process Execution for docker system prune
+**Vulnerability:** Use of shell wrapper `/bin/bash -c "docker system prune -f 2>&1"` for external command execution. While no dynamic input is passed in this specific case, using a shell wrapper for fixed commands is an anti-pattern that violates defense-in-depth principles and increases the attack surface (e.g., if PATH or environment was manipulated).
+**Learning:** Shell redirections like `2>&1` can be implemented securely in Foundation.Process without needing a shell by assigning the same `Pipe()` object to both `standardOutput` and `standardError`.
+**Prevention:** Always execute binary commands directly via `Process` (e.g., `/usr/bin/env docker`) using the `.arguments` array rather than wrapping them in a shell command string.
diff --git a/Sources/Cacheout/ViewModels/CacheoutViewModel.swift b/Sources/Cacheout/ViewModels/CacheoutViewModel.swift
index 13a9811..e50a217 100644
--- a/Sources/Cacheout/ViewModels/CacheoutViewModel.swift
+++ b/Sources/Cacheout/ViewModels/CacheoutViewModel.swift
@@ -231,8 +231,8 @@ class CacheoutViewModel: ObservableObject {
 
         let process = Process()
         let pipe = Pipe()
-        process.executableURL = URL(fileURLWithPath: "/bin/bash")
-        process.arguments = ["-c", "docker system prune -f 2>&1"]
+        process.executableURL = URL(fileURLWithPath: "/usr/bin/env")
+        process.arguments = ["docker", "system", "prune", "-f"]
         process.standardOutput = pipe
         process.standardError = pipe
         process.environment = [