diff --git a/pkg/runner/runner.go b/pkg/runner/runner.go
index d61b3a33..aea91b34 100644
--- a/pkg/runner/runner.go
+++ b/pkg/runner/runner.go
@@ -853,7 +853,7 @@ func (r *Runner) handleCredentials(callCtx engine.Context, monitor Monitor, env
 
 			res, err := r.subCall(callCtx.Ctx, callCtx, monitor, env, ref.ToolID, input, "", engine.CredentialToolCategory)
 			if err != nil {
-				return nil, fmt.Errorf("failed to run credential tool %s: %w", ref.Reference, err)
+				return nil, err
 			}
 
 			if res.Result == nil {
diff --git a/pkg/sdkserver/run.go b/pkg/sdkserver/run.go
index 93c9996b..94bdf93c 100644
--- a/pkg/sdkserver/run.go
+++ b/pkg/sdkserver/run.go
@@ -80,7 +80,7 @@ func processEventStreamOutput(logger mvl.Logger, w http.ResponseWriter, id strin
 		})
 	case err := <-errChan:
 		writeServerSentEvent(logger, w, map[string]any{
-			"stderr": fmt.Sprintf("failed to run: %v", err),
+			"stderr": err.Error(),
 		})
 	}