diff --git a/.jules/sentinel.md b/.jules/sentinel.md
index 903b6d6..a16dfc9 100644
--- a/.jules/sentinel.md
+++ b/.jules/sentinel.md
@@ -17,3 +17,7 @@
 **Vulnerability:** Webhook configuration allowed unencrypted `http` URLs, exposing sensitive system metrics and alerts to interception.
 **Learning:** Validation in `StatusSocket.swift` permitted both `http` and `https`, and `WebhookAlerter.swift` didn't validate the scheme at all during parsing, potentially allowing insecure data transmission.
 **Prevention:** Consistently enforce the `https` scheme requirement in both configuration validation (`AutopilotConfigValidator`) and active parsing (`WebhookConfig.parse`) to ensure secure data transit.
+
+## 2024-05-18 - Process Deadlock in CacheoutViewModel.runCleanCommand
+**Vulnerability:** `process.waitUntilExit()` was called before reading `pipe.fileHandleForReading` when executing `docker system prune` in `CacheoutViewModel.swift`. A specific instance of the 2024-04-22 pattern.
+**Prevention:** Same as 2024-04-22 — read the pipe before calling `waitUntilExit()`, or prefer `try fileHandle.readToEnd()`.
diff --git a/Sources/Cacheout/ViewModels/CacheoutViewModel.swift b/Sources/Cacheout/ViewModels/CacheoutViewModel.swift
index 0e8464b..27de41a 100644
--- a/Sources/Cacheout/ViewModels/CacheoutViewModel.swift
+++ b/Sources/Cacheout/ViewModels/CacheoutViewModel.swift
@@ -253,8 +253,8 @@ class CacheoutViewModel: ObservableObject {
         do {
             let result = try await Task.detached { () -> (Int32, String) in
                 try process.run()
+                let data = try pipe.fileHandleForReading.readToEnd() ?? Data()
                 process.waitUntilExit()
-                let data = pipe.fileHandleForReading.readDataToEndOfFile()
                 let output = String(data: data, encoding: .utf8) ?? ""
                 return (process.terminationStatus, output)
             }.value