chore: import upstream snapshot with attribution

tests/agents/test_think_tool.py

@@ -0,0 +1,52 @@
+"""Tests for ThinkTool — the chain-of-thought pseudo-tool."""
+
+import pytest
+from application.agents.tools.think import (
+    THINK_TOOL_ENTRY,
+    THINK_TOOL_ID,
+    ThinkTool,
+)
+
+
+@pytest.mark.unit
+class TestThinkTool:
+
+    def test_id_constant(self):
+        assert THINK_TOOL_ID == "think"
+
+    def test_entry_has_reason_action(self):
+        actions = THINK_TOOL_ENTRY["actions"]
+        assert len(actions) == 1
+        assert actions[0]["name"] == "reason"
+        assert actions[0]["active"] is True
+
+    def test_execute_reason_returns_continue(self):
+        tool = ThinkTool()
+        result = tool.execute_action("reason", reasoning="step by step thinking")
+        assert result == "Continue."
+
+    def test_execute_unknown_action_returns_continue(self):
+        tool = ThinkTool()
+        result = tool.execute_action("unknown_action")
+        assert result == "Continue."
+
+    def test_get_actions_metadata(self):
+        tool = ThinkTool()
+        meta = tool.get_actions_metadata()
+        assert len(meta) == 1
+        assert meta[0]["name"] == "reason"
+        props = meta[0]["parameters"]["properties"]
+        assert "reasoning" in props
+        assert props["reasoning"]["filled_by_llm"] is True
+
+    def test_get_config_requirements_empty(self):
+        tool = ThinkTool()
+        assert tool.get_config_requirements() == {}
+
+    def test_init_accepts_no_config(self):
+        tool = ThinkTool()
+        assert tool is not None
+
+    def test_init_accepts_config(self):
+        tool = ThinkTool(config={"key": "value"})
+        assert tool is not None