diff --git a/tests/test_issue_628_orchestration.py b/tests/test_issue_628_orchestration.py
index 2cb0c54..91e9437 100644
--- a/tests/test_issue_628_orchestration.py
+++ b/tests/test_issue_628_orchestration.py
@@ -1,10 +1,20 @@
-"""Integration tests for autonomous canonical handoffs and dependency-aware task orchestration (#628).
+"""Regression tests for #628 building blocks (child scope only).
 
-Verifies the 21 acceptance criteria specified in umbrella Issue #628:
-- Non-terminal stage handoff generation and retrieval
-- Multi-worker concurrency and exclusive task assignment isolation
-- Structured dependency graph integration with the work allocator
-- Head SHA invalidation and stale review decision protection
+Honest scope: unit coverage of pre-existing APIs used by umbrella #628.
+This module does **not** implement or verify all 21 umbrella acceptance
+criteria, automatic handoff store/retrieve, multi-worker product wiring,
+or end-to-end orchestration.
+
+Covered building blocks:
+- CTH format / parse / assess (`format_cth_body`, `parse_cth_comment`,
+  `assess_cth_comment`)
+- Exclusive-ownership skip classification (`classify_skip` with
+  OWNERSHIP_FOREIGN vs OWNERSHIP_OWN)
+- Durable dependency edges (`upsert_dependency_edge` / list) and skip
+  when dependency_unmet
+- Edge state transition UNMET -> MET
+
+Parent umbrella remains #628; this slice is a scoped child issue only.
 """
 
 import unittest
@@ -42,7 +52,7 @@ class TestIssue628Orchestration(unittest.TestCase):
         self._tmp.cleanup()
 
     def test_canonical_handoff_serialization_and_retrieval(self):
-        """AC1 & AC2: Every non-terminal stage stores and retrieves a valid canonical handoff."""
+        """Building block: format/parse/assess a CTH body (not full AC1/AC2 product path)."""
         handoff = format_cth_body(
             cth_type="Author Handoff",
             status="completed",
@@ -51,7 +61,7 @@ class TestIssue628Orchestration(unittest.TestCase):
             decision="Implementation complete, tests passing",
             proof="pytest tests/test_issue_628_orchestration.py passed",
             next_action="Review PR and run reviewer pre-flight",
-            ready_to_paste_prompt="Review PR for issue #628",
+            ready_to_paste_prompt="Review PR for child issue #878 (parent #628)",
         )
         self.assertIn("CTH: Author Handoff", handoff)
 
@@ -63,11 +73,11 @@ class TestIssue628Orchestration(unittest.TestCase):
         self.assertFalse(assessment["block"])
 
     def test_exclusive_task_unit_single_owner(self):
-        """AC5 & AC6: Concurrency isolation ensures an exclusive task unit has only one active owner."""
+        """Building block: classify_skip foreign vs own ownership."""
         candidate = WorkCandidate(
             kind="issue",
-            number=628,
-            title="Umbrella #628 test candidate",
+            number=878,
+            title="Child #878 ownership classify candidate",
             state="open",
             labels=["status:in-progress"],
             blocked=False,
@@ -93,14 +103,14 @@ class TestIssue628Orchestration(unittest.TestCase):
         self.assertIsNone(skip_self)
 
     def test_durable_dependency_graph_blocking(self):
-        """AC8, AC9, AC10: Durable dependency edges exclude blocked tasks from assignment."""
-        # Upsert a blocking dependency edge between issue 628 and blocker 601
+        """Building block: unmet dependency edge + classify_skip on dependency_unmet."""
+        # Upsert a blocking dependency edge between issue 878 and blocker 601
         self.db.upsert_dependency_edge(
             remote="prgs",
             org="Scaled-Tech-Consulting",
             repo="Gitea-Tools",
             source_kind="issue",
-            source_number=628,
+            source_number=878,
             target_kind="issue",
             target_number=601,
             edge_type=dependency_graph.EDGE_ISSUE_BLOCKED_BY_ISSUE,
@@ -115,7 +125,7 @@ class TestIssue628Orchestration(unittest.TestCase):
             org="Scaled-Tech-Consulting",
             repo="Gitea-Tools",
             source_kind="issue",
-            source_number=628,
+            source_number=878,
         )
         self.assertEqual(len(edges), 1)
         self.assertEqual(edges[0]["state"], "unmet")
@@ -124,13 +134,13 @@ class TestIssue628Orchestration(unittest.TestCase):
         # When dependency is unmet, candidate is blocked from selection
         candidate = WorkCandidate(
             kind="issue",
-            number=628,
+            number=878,
             title="Blocked candidate",
             state="open",
             labels=[],
             blocked=False,
             dependency_unmet=True,
-            dependency_reason="issue#628 is blocked by unmet dependency issue#601",
+            dependency_reason="issue#878 is blocked by unmet dependency issue#601",
         )
         skip_reason = classify_skip(
             c=candidate,
@@ -142,13 +152,13 @@ class TestIssue628Orchestration(unittest.TestCase):
         self.assertIn("issue#601", skip_reason)
 
     def test_dependency_completion_reevaluation(self):
-        """AC11: Dependency completion updates edge state to MET."""
+        """Building block: dependency edge state can transition UNMET -> MET."""
         self.db.upsert_dependency_edge(
             remote="prgs",
             org="Scaled-Tech-Consulting",
             repo="Gitea-Tools",
             source_kind="issue",
-            source_number=628,
+            source_number=878,
             target_kind="issue",
             target_number=601,
             edge_type=dependency_graph.EDGE_ISSUE_BLOCKED_BY_ISSUE,
@@ -164,7 +174,7 @@ class TestIssue628Orchestration(unittest.TestCase):
             org="Scaled-Tech-Consulting",
             repo="Gitea-Tools",
             source_kind="issue",
-            source_number=628,
+            source_number=878,
             target_kind="issue",
             target_number=601,
             edge_type=dependency_graph.EDGE_ISSUE_BLOCKED_BY_ISSUE,
@@ -179,7 +189,7 @@ class TestIssue628Orchestration(unittest.TestCase):
             org="Scaled-Tech-Consulting",
             repo="Gitea-Tools",
             source_kind="issue",
-            source_number=628,
+            source_number=878,
         )
         self.assertEqual(len(edges), 1)
         self.assertEqual(edges[0]["state"], "met")