from agent_platform.runtime.context import ContextPolicy


def test_context_removes_rendered_tool_details_and_compacts() -> None:
    policy = ContextPolicy()
    messages = [
        {"role": "user", "content": "old-" + "x" * 10_000},
        {
            "role": "assistant",
            "content": '<details type="tool_calls" done="true"><summary>x</summary>secret trace</details> visible',
        },
        {"role": "user", "content": "current task"},
    ]
    result = policy.prepare(
        messages,
        system_prompt="system",
        memories=[{"content": "remember this"}],
        char_budget=8_500,
    )
    serialized = str(result.messages)
    assert "secret trace" not in serialized
    assert "current task" in serialized
    assert "remember this" in serialized
    assert result.dropped_messages >= 1