feat(tasks): add skill-templated task graph execution

app-instance/backend/tests/unit/test_agent_team_toggle.py

@@ -0,0 +1,67 @@
+from __future__ import annotations
+
+import asyncio
+from types import SimpleNamespace
+
+from beaver.engine.providers.base import LLMProvider, LLMResponse
+from beaver.engine.providers.factory import ProviderBundle
+from beaver.tasks import TaskExecutionPlanner, TaskRecord
+
+
+class _TeamPlannerProvider(LLMProvider):
+    def __init__(self) -> None:
+        super().__init__()
+        self.calls = 0
+
+    async def chat(
+        self,
+        messages: list[dict],
+        tools: list[dict] | None = None,
+        model: str | None = None,
+        max_tokens: int = 4096,
+        temperature: float = 0.7,
+    ) -> LLMResponse:
+        self.calls += 1
+        return LLMResponse(
+            content='{"mode":"team","reason":"parallel research","strategy":"parallel","nodes":[{"node_id":"research","task":"research","agent":{"name":"researcher"}}]}',
+            finish_reason="stop",
+            provider_name="stub",
+            model="stub-model",
+        )
+
+    def get_default_model(self) -> str:
+        return "stub-model"
+
+
+def test_agent_team_can_be_disabled_by_environment(monkeypatch) -> None:
+    monkeypatch.setenv("BEAVER_AGENT_TEAM_ENABLED", "0")
+    provider = _TeamPlannerProvider()
+    task = TaskRecord(
+        task_id="task-1",
+        session_id="session-1",
+        description="research and compare options",
+        goal="research and compare options",
+        constraints=[],
+        priority=0,
+        status="open",
+        creator="test",
+        created_at="now",
+        updated_at="now",
+    )
+    bundle = ProviderBundle(
+        main_runtime=SimpleNamespace(model="stub-model", provider_name="stub"),
+        main_provider=provider,
+    )
+
+    plan = asyncio.run(
+        TaskExecutionPlanner().plan(
+            task=task,
+            user_message="research and compare options",
+            attempt_index=1,
+            provider_bundle=bundle,
+        )
+    )
+
+    assert plan.mode == "single"
+    assert plan.reason == "planner_disabled_by_environment"
+    assert provider.calls == 0