dev/dev-agent.sh

@@ -575,6 +575,13 @@ else
   outcome="blocked_${_PR_WALK_EXIT_REASON:-agent_failed}"
   profile_write_journal "$ISSUE" "$ISSUE_TITLE" "$outcome" "$FILES_CHANGED" || true
 
+  # Cleanup on failure: close PR, delete remote branch, clean up worktree
+  if [ -n "$PR_NUMBER" ]; then
+    pr_close "$PR_NUMBER"
+  fi
+  git push "$FORGE_REMOTE" --delete "$BRANCH" 2>/dev/null || true
+  worktree_cleanup "$WORKTREE"
+  rm -f "$SID_FILE" "$IMPL_SUMMARY_FILE"
   CLAIMED=false
 fi
 

lib/pr-lifecycle.sh

@@ -348,6 +348,22 @@ pr_is_merged() {
   [ "$merged" = "true" ]
 }
 
+# ---------------------------------------------------------------------------
+# pr_close — Close a PR via forge API.
+# Args: pr_number
+# Returns: 0=closed, 1=error
+# ---------------------------------------------------------------------------
+pr_close() {
+  local pr_num="$1"
+
+  _prl_log "closing PR #${pr_num}"
+  curl -sf -X PATCH \
+    -H "Authorization: token ${FORGE_TOKEN}" \
+    -H "Content-Type: application/json" \
+    "${FORGE_API}/pulls/${pr_num}" \
+    -d '{"state":"closed"}' >/dev/null 2>&1 || true
+}
+
 # ---------------------------------------------------------------------------
 # pr_walk_to_merge — Walk a PR through CI, review, and merge.
 #