def make_request(conversation, new_query):
    """Multi-turn cache: history'nin son turn'üne breakpoint."""
 
    # System + tools cache (sabit)
    system_blocks = [
        {"type": "text", "text": KB, "cache_control": {"type": "ephemeral", "ttl": "1h"}},
    ]
    tools = [*TOOLS[:-1], {**TOOLS[-1], "cache_control": {"type": "ephemeral", "ttl": "1h"}}]
 
    # History — son assistant cevabına breakpoint
    if conversation:
        last_msg = conversation[-1]
        history_with_cache = [
            *conversation[:-1],
            {
                **last_msg,
                "content": [
                    {
                        "type": "text",
                        "text": last_msg["content"] if isinstance(last_msg["content"], str) else last_msg["content"][0]["text"],
                        "cache_control": {"type": "ephemeral", "ttl": "5m"},
                    }
                ],
            },
        ]
    else:
        history_with_cache = []
 
    # Yeni user query (dinamik)
    messages = [*history_with_cache, {"role": "user", "content": new_query}]
 
    return client.messages.create(
        model="claude-sonnet-4-6",
        system=system_blocks,
        tools=tools,
        messages=messages,
    )