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")

await client.sessions.storeMessage(session.id, {
    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
const messages = await client.sessions.getMessages(session.id, { format: "anthropic" });

client.sessions.store_message(
    session_id=session.id,
    blob={
        "role": "assistant",
        "content": [
            {
                "type": "thinking",
                "thinking": "Let me reason step by step...",
                "signature": "EqoBCkgIAxgCIkD..."
            },
            {
                "type": "text",
                "text": "The answer is 42."
            }
        ]
    },
    format="anthropic"
)

# Retrieved in Anthropic or Gemini format: thinking blocks round-trip as native thinking blocks
# Retrieved in OpenAI format: thinking content is downgraded to plain text

await client.sessions.storeMessage(session.id, {
    role: "assistant",
    content: [
        {
            type: "thinking",
            thinking: "Let me reason step by step...",
            signature: "EqoBCkgIAxgCIkD..."
        },
        {
            type: "text",
            text: "The answer is 42."
        }
    ]
}, { format: "anthropic" });

// Retrieved in Anthropic or Gemini format: thinking blocks round-trip as native thinking blocks
// Retrieved in OpenAI format: thinking content is downgraded to plain text