diff --git a/api/core/workflow_copilot/models.py b/api/core/workflow_copilot/models.py
index b3f1cf10d58..222bd4adc55 100644
--- a/api/core/workflow_copilot/models.py
+++ b/api/core/workflow_copilot/models.py
@@ -237,6 +237,10 @@ class CopilotContext:
     resource_selection: dict[str, Any] = field(default_factory=dict)
     built_node_ids: list[str] = field(default_factory=list)
 
+    # -- Edit fields (Slice 3, additive) --
+    edit_rules: dict[str, Any] = field(default_factory=dict)
+    edit_target_node_ids: list[str] = field(default_factory=list)
+
 
 @dataclass(kw_only=True)
 class Action:
diff --git a/api/services/workflow_copilot/serde.py b/api/services/workflow_copilot/serde.py
index 9e8d1090417..f370a9ec43e 100644
--- a/api/services/workflow_copilot/serde.py
+++ b/api/services/workflow_copilot/serde.py
@@ -67,4 +67,6 @@ def context_from_dict(d: dict[str, Any]) -> CopilotContext:
         plan_version_tag=d.get("plan_version_tag", ""),
         resource_selection=dict(d.get("resource_selection") or {}),
         built_node_ids=list(d.get("built_node_ids") or []),
+        edit_rules=dict(d.get("edit_rules") or {}),
+        edit_target_node_ids=list(d.get("edit_target_node_ids") or []),
     )
diff --git a/api/tests/unit_tests/services/workflow_copilot/test_serde.py b/api/tests/unit_tests/services/workflow_copilot/test_serde.py
index 1263e4450e8..cbbe096984d 100644
--- a/api/tests/unit_tests/services/workflow_copilot/test_serde.py
+++ b/api/tests/unit_tests/services/workflow_copilot/test_serde.py
@@ -113,3 +113,24 @@ def test_context_from_dict_defaults_build_fields_when_absent():
     assert fc.goal_text == ""
     assert fc.requirements == {}
     assert fc.plan_items == []
+
+
+def test_context_roundtrip_preserves_edit_fields():
+    from core.workflow_copilot.models import CopilotContext
+    from services.workflow_copilot.serde import context_from_dict, context_to_dict
+
+    fc = CopilotContext(
+        edit_rules={"risk_threshold": "high", "preserve_summary": True},
+        edit_target_node_ids=["llm", "knowledge_retrieval"],
+    )
+    out = context_from_dict(context_to_dict(fc))
+    assert out.edit_rules == {"risk_threshold": "high", "preserve_summary": True}
+    assert out.edit_target_node_ids == ["llm", "knowledge_retrieval"]
+
+
+def test_context_from_dict_defaults_edit_fields_when_absent():
+    from services.workflow_copilot.serde import context_from_dict
+
+    out = context_from_dict({})  # an older row with no edit_* keys
+    assert out.edit_rules == {}
+    assert out.edit_target_node_ids == []