diff --git a/tools/run-plan.sh b/tools/run-plan.sh
index 0fc9954..89d9f47 100755
--- a/tools/run-plan.sh
+++ b/tools/run-plan.sh
@@ -40,7 +40,9 @@ for task in "$plan"/[0-9][0-9]-*.md; do
     before=$(git rev-parse HEAD)
     echo "=== $milestone/$name: started $(date '+%H:%M:%S')"
     # shellcheck disable=SC2086
-    if ! opencode run -m "$model" $flags --title "$milestone/$name" "$prompt" \
+    # </dev/null: OpenCode 1.15 reads a piped stdin as extra prompt and waits for EOF, so a
+    # backgrounded driver would hang before the first model request (2026-09-25).
+    if ! opencode run -m "$model" $flags --title "$milestone/$name" "$prompt" </dev/null \
         > "$runs/$name.log" 2>&1; then
         echo "run-plan: opencode exited with an error in $name; see $runs/$name.log" >&2
         exit 1