diff --git a/.gitea/workflows/scripts/build-activity-log.sh b/.gitea/workflows/scripts/build-activity-log.sh
index ef266a5..bd92c51 100755
--- a/.gitea/workflows/scripts/build-activity-log.sh
+++ b/.gitea/workflows/scripts/build-activity-log.sh
@@ -13,7 +13,13 @@ jq -r '
   def trunc(n): if length > n then (.[0:n] + "…") else . end;
   select(.type=="tool_use" or .type=="text") |
     if .type=="text" then
-      "💬 " + ((.part.text // "") | trunc(4000))
+      # Drop the PR-description block from the reasoning trail — it is already published verbatim as
+      # the PR description, so repeating it here is redundant noise. Skip a text part that is nothing
+      # but that block (would otherwise be an empty "💬 " entry).
+      ((.part.text // "")
+       | gsub("BEGIN_PR_DESCRIPTION.*?END_PR_DESCRIPTION"; ""; "m")
+       | gsub("\\A[[:space:]]+|[[:space:]]+\\z"; "")) as $t |
+      if $t == "" then empty else "💬 " + ($t | trunc(4000)) end
     else
       (.part.tool // "?") as $t |
       ((.part.state.title // (.part.state.input | tojson | trunc(160)) // "")) as $title |