diff --git a/api/tests/integration_tests/tools/__mock/http.py b/api/tests/unit_tests/core/tools/custom_tool/api_tool_http_fixture.py
similarity index 95%
rename from api/tests/integration_tests/tools/__mock/http.py
rename to api/tests/unit_tests/core/tools/custom_tool/api_tool_http_fixture.py
index fb2e3abcee7..18e3bbeac77 100644
--- a/api/tests/integration_tests/tools/__mock/http.py
+++ b/api/tests/unit_tests/core/tools/custom_tool/api_tool_http_fixture.py
@@ -1,3 +1,5 @@
+"""HTTP fixture for API-tool unit tests."""
+
 import json
 from typing import Literal
 
diff --git a/api/tests/integration_tests/tools/api_tool/test_api_tool.py b/api/tests/unit_tests/core/tools/custom_tool/test_api_tool_request_assembly.py
similarity index 95%
rename from api/tests/integration_tests/tools/api_tool/test_api_tool.py
rename to api/tests/unit_tests/core/tools/custom_tool/test_api_tool_request_assembly.py
index 9079aa7d6d2..b811298e190 100644
--- a/api/tests/integration_tests/tools/api_tool/test_api_tool.py
+++ b/api/tests/unit_tests/core/tools/custom_tool/test_api_tool_request_assembly.py
@@ -4,7 +4,7 @@ from core.tools.entities.common_entities import I18nObject
 from core.tools.entities.tool_bundle import ApiToolBundle
 from core.tools.entities.tool_entities import ToolEntity, ToolIdentity
 
-pytest_plugins = ("tests.integration_tests.tools.__mock.http",)
+pytest_plugins = ("tests.unit_tests.core.tools.custom_tool.api_tool_http_fixture",)
 
 tool_bundle = {
     "server_url": "http://www.example.com/{path_param}",
diff --git a/api/tests/integration_tests/workflow/nodes/test_llm.py b/api/tests/unit_tests/core/workflow/nodes/llm/test_llm_node_execution_behavior.py
similarity index 99%
rename from api/tests/integration_tests/workflow/nodes/test_llm.py
rename to api/tests/unit_tests/core/workflow/nodes/llm/test_llm_node_execution_behavior.py
index 2e9b7317f69..87db1808a36 100644
--- a/api/tests/integration_tests/workflow/nodes/test_llm.py
+++ b/api/tests/unit_tests/core/workflow/nodes/llm/test_llm_node_execution_behavior.py
@@ -1,3 +1,5 @@
+"""Unit coverage for LLM node execution with model boundaries replaced by test doubles."""
+
 import json
 import time
 import uuid
diff --git a/api/tests/integration_tests/workflow/nodes/test_tool.py b/api/tests/unit_tests/core/workflow/nodes/tool/test_tool_node_invocation_behavior.py
similarity index 98%
rename from api/tests/integration_tests/workflow/nodes/test_tool.py
rename to api/tests/unit_tests/core/workflow/nodes/tool/test_tool_node_invocation_behavior.py
index d3e248cc28c..0369cff60fa 100644
--- a/api/tests/integration_tests/workflow/nodes/test_tool.py
+++ b/api/tests/unit_tests/core/workflow/nodes/tool/test_tool_node_invocation_behavior.py
@@ -1,3 +1,5 @@
+"""Unit coverage for tool-node invocation with the tool boundary patched."""
+
 import time
 import uuid
 from unittest.mock import MagicMock, patch