fix: expose context engine tools with saved toolsets

tests/run_agent/test_plugin_context_engine_init.py

@@ -26,6 +26,17 @@ class _StubEngine(ContextEngine):
         return messages
 
 
+class _ToolEngine(_StubEngine):
+    def get_tool_schemas(self):
+        return [
+            {
+                "name": "stub_recover",
+                "description": "Recover context from the stub engine.",
+                "parameters": {"type": "object", "properties": {}},
+            }
+        ]
+
+
 def test_plugin_engine_gets_context_length_on_init():
     """Plugin context engine should have context_length set during AIAgent init."""
     engine = _StubEngine()
@@ -56,6 +67,46 @@ def test_plugin_engine_gets_context_length_on_init():
     assert engine.threshold_tokens == int(204_800 * engine.threshold_percent)
 
 
+def test_active_context_engine_tools_survive_explicit_platform_toolsets():
+    """LCM-style recovery tools must survive saved `hermes tools` lists."""
+    engine = _ToolEngine()
+    cfg = {
+        "context": {"engine": "stub"},
+        "platform_toolsets": {"cli": ["web", "terminal"]},
+        "agent": {},
+    }
+
+    from hermes_cli.tools_config import _get_platform_tools
+
+    enabled_toolsets = _get_platform_tools(cfg, "cli", include_default_mcp_servers=False)
+    assert "context_engine" in enabled_toolsets
+
+    with (
+        patch("hermes_cli.config.load_config", return_value=cfg),
+        patch("plugins.context_engine.load_context_engine", return_value=engine),
+        patch("agent.model_metadata.get_model_context_length", return_value=204_800),
+        patch("run_agent.get_tool_definitions", return_value=[]),
+        patch("run_agent.check_toolset_requirements", return_value={}),
+        patch("run_agent.OpenAI"),
+    ):
+        from run_agent import AIAgent
+
+        agent = AIAgent(
+            api_key="test-key-1234567890",
+            base_url="https://openrouter.ai/api/v1",
+            enabled_toolsets=sorted(enabled_toolsets),
+            quiet_mode=True,
+            skip_context_files=True,
+            skip_memory=True,
+        )
+
+    assert "stub_recover" in getattr(agent, "valid_tool_names", set())
+    assert "stub_recover" in {
+        tool.get("function", {}).get("name")
+        for tool in getattr(agent, "tools", [])
+    }
+
+
 def test_plugin_engine_update_model_args():
     """Verify update_model() receives model, context_length, base_url, api_key, provider."""
     engine = _StubEngine()