diff --git a/pkg/agentic/commit.go b/pkg/agentic/commit.go
index 0f765e8..d45f191 100644
--- a/pkg/agentic/commit.go
+++ b/pkg/agentic/commit.go
@@ -104,7 +104,13 @@ func (s *PrepSubsystem) commitWorkspace(ctx context.Context, input CommitInput)
 		}
 		return CommitOutput{}, err
 	}
-	core.WriteAll(appendHandle.Value, line)
+	if writeResult := core.WriteAll(appendHandle.Value, line); !writeResult.OK {
+		err, _ := writeResult.Value.(error)
+		if err == nil {
+			err = core.E("commitWorkspace", "failed to append journal entry", nil)
+		}
+		return CommitOutput{}, err
+	}
 
 	marker := commitMarker{
 		Workspace:   WorkspaceName(workspaceDir),
diff --git a/pkg/agentic/events.go b/pkg/agentic/events.go
index 2727161..99ee36b 100644
--- a/pkg/agentic/events.go
+++ b/pkg/agentic/events.go
@@ -34,7 +34,9 @@ func emitEvent(eventType, agent, workspace, status string) {
 	if !r.OK {
 		return
 	}
-	core.WriteAll(r.Value, line)
+	if writeResult := core.WriteAll(r.Value, line); !writeResult.OK {
+		core.Warn("agentic.emitEvent: failed to append event", "path", eventsFile, "reason", writeResult.Value)
+	}
 }
 
 func emitStartEvent(agent, workspace string) {
diff --git a/pkg/agentic/review_queue.go b/pkg/agentic/review_queue.go
index 173aec8..1ce123b 100644
--- a/pkg/agentic/review_queue.go
+++ b/pkg/agentic/review_queue.go
@@ -419,7 +419,9 @@ func (s *PrepSubsystem) storeReviewOutput(repoDir, repo, reviewer, output string
 		core.Warn("reviewQueue: failed to open review journal", "path", jsonlPath, "reason", r.Value)
 		return
 	}
-	core.WriteAll(r.Value, core.Concat(jsonLine, "\n"))
+	if writeResult := core.WriteAll(r.Value, core.Concat(jsonLine, "\n")); !writeResult.OK {
+		core.Warn("reviewQueue: failed to append review journal entry", "path", jsonlPath, "reason", writeResult.Value)
+	}
 }
 
 // s.saveRateLimitState(&RateLimitInfo{Limited: true, RetryAt: time.Now().Add(30 * time.Minute)})