diff --git a/docs/reference.md b/docs/reference.md
index 753fe09..908ad1b 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -120,7 +120,8 @@ Primary commands write compact JSON to stdout by default. This does not require
   genome accession ... --include genome --filename ...` commands, records
   return codes and ZIP readiness for later inspection, and still does not
   mutate manifests, install genomes, accept final genome usability, or create
-  strict scientific deliverables.
+  strict scientific deliverables. For blocked download-smoke outputs, summary
+  `blockers` are repeated in the top-level `blocking` array for AI routing.
 
 AI-facing stdout must stay short. Long logs, reports, tables, diagnostics, and
 evidence belong in the run directory.
diff --git a/tests/test_cli_download_smoke.py b/tests/test_cli_download_smoke.py
index 6f76c67..50a0716 100644
--- a/tests/test_cli_download_smoke.py
+++ b/tests/test_cli_download_smoke.py
@@ -593,6 +593,9 @@ def test_download_smoke_execute_blocks_mutated_command_manifest(capsys, tmp_path
     assert payload["status"] == "blocked"
     assert payload["downloads_triggered"] == 0
     assert payload["network_access"] is False
+    assert payload["blocking"] == [
+        {"id": "command_manifest_invalid", "message": "command_manifest_invalid"}
+    ]
     assert summary["command_invalid_count"] == 1
     assert summary["blockers"] == ["command_manifest_invalid"]
     assert rows[0]["command_valid"] == "false"
@@ -1310,6 +1313,12 @@ def test_download_smoke_prepare_blocks_without_planned_rows(capsys, tmp_path):
     payload = json.loads(capsys.readouterr().out)
     summary = payload["bounded_download_smoke_summary"]
     assert payload["status"] == "blocked"
+    assert payload["blocking"] == [
+        {
+            "id": "no_planned_ncbi_download_rows",
+            "message": "no_planned_ncbi_download_rows",
+        }
+    ]
     assert summary["ready"] is False
     assert summary["blockers"] == ["no_planned_ncbi_download_rows"]
 
diff --git a/typetreeflow/download_smoke_cli.py b/typetreeflow/download_smoke_cli.py
index 22aac63..0865640 100644
--- a/typetreeflow/download_smoke_cli.py
+++ b/typetreeflow/download_smoke_cli.py
@@ -378,6 +378,10 @@ def run_download_smoke_command(
         ),
         outdir=str(args.outdir) if args.write else "",
     )
+    if status != "pass":
+        summary_blocking = _blocking_from_summary(result["summary"])
+        if summary_blocking:
+            payload["blocking"] = summary_blocking
     if args.action == "prepare":
         payload["bounded_download_smoke_summary"] = result["summary"]
     elif args.action == "inspect":
@@ -2361,6 +2365,18 @@ def _payload(
     return payload
 
 
+def _blocking_from_summary(summary: dict[str, object]) -> list[dict[str, str]]:
+    blockers = summary.get("blockers", [])
+    if not isinstance(blockers, list):
+        return []
+    result: list[dict[str, str]] = []
+    for blocker in blockers:
+        blocker_id = str(blocker).strip()
+        if blocker_id:
+            result.append({"id": blocker_id, "message": blocker_id})
+    return result
+
+
 def _payload_schema_version(command: str) -> str:
     if command == INSPECT_COMMAND:
         return "download_smoke_inspect.v1"