diff --git a/api/tests/unit_tests/core/workflow/test_human_input_adapter.py b/api/tests/unit_tests/core/workflow/test_human_input_adapter.py
index 1e8ee1d5240..1ce4a7a1d50 100644
--- a/api/tests/unit_tests/core/workflow/test_human_input_adapter.py
+++ b/api/tests/unit_tests/core/workflow/test_human_input_adapter.py
@@ -4,10 +4,12 @@ import pytest
 from pydantic import BaseModel
 
 from core.workflow.human_input_adapter import (
+    BoundRecipient,
     DeliveryMethodType,
     EmailDeliveryConfig,
     EmailDeliveryMethod,
     EmailRecipients,
+    ExternalRecipient,
     InstantMessageDeliveryMethod,
     InstantMessageProvider,
     InstantMessageRecipientType,
@@ -24,7 +26,7 @@ from graphon.nodes.base.variable_template_parser import VariableTemplateParser
 from graphon.runtime import VariablePool
 
 
-def test_render_body_template_replaces_variable_values():
+def test_render_body_template_replaces_variable_values() -> None:
     config = EmailDeliveryConfig(
         recipients=EmailRecipients(),
         subject="Subject",
@@ -38,14 +40,14 @@ def test_render_body_template_replaces_variable_values():
     assert result == "Hello World https://example.com"
 
 
-def test_render_markdown_body_renders_markdown_to_html():
+def test_render_markdown_body_renders_markdown_to_html() -> None:
     rendered = EmailDeliveryConfig.render_markdown_body("**Bold** and [link](https://example.com)")
 
     assert "<strong>Bold</strong>" in rendered
     assert '<a href="https://example.com">link</a>' in rendered
 
 
-def test_render_markdown_body_sanitizes_unsafe_html():
+def test_render_markdown_body_sanitizes_unsafe_html() -> None:
     rendered = EmailDeliveryConfig.render_markdown_body(
         '<script>alert("xss")</script><a href="javascript:alert(1)" onclick="alert(2)">Click</a>'
     )
@@ -57,7 +59,7 @@ def test_render_markdown_body_sanitizes_unsafe_html():
     assert "Click" in rendered
 
 
-def test_render_markdown_body_sanitizes_markdown_link_with_javascript_href():
+def test_render_markdown_body_sanitizes_markdown_link_with_javascript_href() -> None:
     rendered = EmailDeliveryConfig.render_markdown_body("[bad](javascript:alert(1)) and [ok](https://example.com)")
 
     assert "javascript:" not in rendered
@@ -65,7 +67,7 @@ def test_render_markdown_body_sanitizes_markdown_link_with_javascript_href():
     assert '<a href="https://example.com">ok</a>' in rendered
 
 
-def test_render_markdown_body_does_not_allow_raw_html_tags():
+def test_render_markdown_body_does_not_allow_raw_html_tags() -> None:
     rendered = EmailDeliveryConfig.render_markdown_body("<b>raw html</b> and **markdown**")
 
     assert "<b>" not in rendered
@@ -73,7 +75,7 @@ def test_render_markdown_body_does_not_allow_raw_html_tags():
     assert "<strong>markdown</strong>" in rendered
 
 
-def test_render_markdown_body_supports_table_syntax():
+def test_render_markdown_body_supports_table_syntax() -> None:
     rendered = EmailDeliveryConfig.render_markdown_body("| h1 | h2 |\n| --- | ---: |\n| v1 | v2 |")
 
     assert "<table>" in rendered
@@ -83,7 +85,7 @@ def test_render_markdown_body_supports_table_syntax():
     assert "style=" not in rendered
 
 
-def test_sanitize_subject_removes_crlf():
+def test_sanitize_subject_removes_crlf() -> None:
     sanitized = EmailDeliveryConfig.sanitize_subject("Notice\r\nBCC:attacker@example.com")
 
     assert "\r" not in sanitized
@@ -91,7 +93,7 @@ def test_sanitize_subject_removes_crlf():
     assert sanitized == "Notice BCC:attacker@example.com"
 
 
-def test_sanitize_subject_removes_html_tags():
+def test_sanitize_subject_removes_html_tags() -> None:
     sanitized = EmailDeliveryConfig.sanitize_subject("<b>Alert</b><img src=x onerror=1>")
 
     assert "<" not in sanitized
@@ -169,9 +171,14 @@ def test_parse_human_input_delivery_methods_normalizes_legacy_recipient_keys() -
     )
 
     assert len(methods) == 1
-    assert methods[0].config.recipients.include_bound_group is True
-    assert methods[0].config.recipients.items[0].reference_id == "user-1"
-    assert methods[0].config.recipients.items[1].email == "external@example.com"
+    config = methods[0].config
+    assert isinstance(config, EmailDeliveryConfig)
+    assert config.recipients.include_bound_group is True
+    bound_recipient, external_recipient = config.recipients.items
+    assert isinstance(bound_recipient, BoundRecipient)
+    assert isinstance(external_recipient, ExternalRecipient)
+    assert bound_recipient.reference_id == "user-1"
+    assert external_recipient.email == "external@example.com"
 
 
 def test_parse_human_input_delivery_methods_returns_empty_for_non_lists() -> None:
@@ -373,7 +380,7 @@ def test_adapt_node_config_for_graph_rewrites_nested_node_data() -> None:
 
 def test_adapt_human_input_node_data_for_graph_accepts_models() -> None:
     class _NodeModel(BaseModel):
-        delivery_methods: list[dict]
+        delivery_methods: list[dict[str, object]]
 
     normalized = adapt_human_input_node_data_for_graph(
         _NodeModel(
@@ -390,11 +397,6 @@ def test_adapt_human_input_node_data_for_graph_accepts_models() -> None:
     assert normalized["delivery_methods"][0]["type"] == DeliveryMethodType.WEBAPP
 
 
-def test_adapt_human_input_node_data_for_graph_rejects_non_mappings() -> None:
-    with pytest.raises(TypeError, match="human-input node data must be a mapping"):
-        adapt_human_input_node_data_for_graph(123)
-
-
 def test_adapt_human_input_node_data_for_graph_preserves_non_mapping_methods() -> None:
     normalized = adapt_human_input_node_data_for_graph(
         {
@@ -478,15 +480,7 @@ def test_webapp_delivery_method_uses_empty_selector_set() -> None:
     assert method.extract_variable_selectors() == ()
 
 
-def test_adapt_node_data_for_graph_rejects_non_mappings() -> None:
-    with pytest.raises(TypeError, match="node data must be a mapping"):
-        adapt_node_data_for_graph(123)
-
-
-def test_adapt_node_config_for_graph_rejects_non_mapping_and_preserves_raw_data() -> None:
-    with pytest.raises(TypeError, match="node config must be a mapping"):
-        adapt_node_config_for_graph(123)
-
+def test_adapt_node_config_for_graph_preserves_raw_data() -> None:
     assert adapt_node_config_for_graph({"data": "raw"}) == {"data": "raw"}
 
 
diff --git a/api/tests/unit_tests/pyrefly.toml b/api/tests/unit_tests/pyrefly.toml
index 4f8b5a9d1ae..213ebe27ef7 100644
--- a/api/tests/unit_tests/pyrefly.toml
+++ b/api/tests/unit_tests/pyrefly.toml
@@ -199,7 +199,6 @@ project-excludes = [
   "../e2e_tests/contracts/core/workflow/nodes/http_request/test_http_request_executor.py",
   "../e2e_tests/contracts/core/workflow/nodes/http_request/test_http_request_node.py",
   "core/workflow/nodes/human_input/test_entities.py",
-  "core/workflow/test_human_input_adapter.py",
   "core/workflow/nodes/knowledge_index/test_knowledge_index_node.py",
   "core/workflow/nodes/knowledge_retrieval/test_knowledge_retrieval_node.py",
   "../helpers/unit/core/workflow/nodes/list_operator/node_spec.py",