Anthropic Special Flags

client.sessions.store_message(
    session_id=session.id,
    blob={
        "role": "user",
        "content": [
            {
                "type": "text",
                "text": "<the entire contents of Pride and Prejudice>",
                "cache_control": {"type": "ephemeral"}
            }
        ]
    },
    format="anthropic"
)

# Retrieved messages preserve the cache_control flag
messages = client.sessions.get_messages(session_id=session.id, format="anthropic")