From 7af9ecd0c30f1cc73c1ed4b326da149d0ca2165b Mon Sep 17 00:00:00 2001
From: Jordan Millar <jordan.millar@iohk.io>
Date: Fri, 6 Mar 2026 09:27:43 -0400
Subject: [PATCH] Print friendly stderr message when future-pparams returns
 null

When there are no protocol parameter changes to be enacted at the
next epoch boundary, print a human-friendly message to stderr while
keeping the null output on stdout for script compatibility.

Closes #1061
---
 cardano-cli/src/Cardano/CLI/EraBased/Query/Run.hs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cardano-cli/src/Cardano/CLI/EraBased/Query/Run.hs b/cardano-cli/src/Cardano/CLI/EraBased/Query/Run.hs
index 276743c9c5..676e68fd7b 100644
--- a/cardano-cli/src/Cardano/CLI/EraBased/Query/Run.hs
+++ b/cardano-cli/src/Cardano/CLI/EraBased/Query/Run.hs
@@ -1671,6 +1671,10 @@ runQueryFuturePParams
     } = conwayEraOnwardsConstraints eon $ do
     futurePParams <- fromExceptTCli $ runQuery nodeConnInfo target $ queryFuturePParams eon
 
+    when (isNothing futurePParams) $
+      liftIO . T.hPutStrLn IO.stderr $
+        "No protocol parameter changes will be enacted at the next epoch boundary."
+
     let output =
           outputFormat
             & ( id