reducerspec

tests/wf_mcp/test_service.py

@@ -111,7 +111,13 @@ def test_service_lists_all_capability_sources_with_owned_capability_names() -> N
 
     std_source = sources_by_id["wf.std"]
     assert "wf.std.runtime_error" in std_source["capabilities"]["node_specs"]
+    assert std_source["capabilities"]["reducers"] == [
+        "wf.std.append",
+        "wf.std.merge_object",
+        "wf.std.replace",
+    ]
     assert std_source["capabilities"]["tools"] == []
+    assert std_source["reducer_count"] == 3
 
     mcp_source = sources_by_id["wf.mcp"]
     assert mcp_source["capabilities"]["node_specs"] == ["wf.mcp.call_tool"]
@@ -146,6 +152,17 @@ def test_wf_std_source_contains_authoring_ops() -> None:
     assert set(specs) == expected
 
 
+def test_wf_std_source_contains_builtin_reducers() -> None:
+    service = WfMcpService(store=FileStore(local_temp_root() / "stdlib_reducer_store"))
+    reducers = service.capability_sources["wf.std"].capabilities.reducers
+
+    assert set(reducers) == {
+        "wf.std.replace",
+        "wf.std.append",
+        "wf.std.merge_object",
+    }
+
+
 def test_service_sources_have_visibility_and_capability_buckets() -> None:
     service = WfMcpService(store=FileStore(local_temp_root() / "source_shape_store"))