diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index f5b2718..0d893aa 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -131,7 +131,14 @@ jobs:
 
           if [ "$rc" -eq 1 ]; then
             cat $annotations
-            cat $markdown >> $GITHUB_STEP_SUMMARY
+            # Truncate to stay under GitHub's 1024k step summary limit. Leave 200 bytes for warning message.
+            max_size=$((1024 * 1024 - 200))
+            if [ "$(wc -c < "$markdown")" -gt "$max_size" ]; then
+              head -c "$max_size" "$markdown" >> $GITHUB_STEP_SUMMARY
+              echo -e "\n\n> **Warning:** Summary was truncated because it exceeded the 1024k size limit." >> $GITHUB_STEP_SUMMARY
+            else
+              cat $markdown >> $GITHUB_STEP_SUMMARY
+            fi
             echo
 
             if [ "$GHA_API_FAIL_THRESHOLD" != "never" ]; then