import time
...

streamer = client.chat_startStream(
    channel=channel_id,
    recipient_team_id=team_id,
    recipient_user_id=user_id,
    thread_ts=thread_ts,
    chunks=[
        MarkdownTextChunk(text="**onwards processing**"),
        TaskUpdateChunk(
            id="12",
            title="counting bytes...",
            status="in_progress",
        ),
    ],
)

time.sleep(4)

client.chat_appendStream(
    channel=channel_id,
    ts=streamer.get("ts"),
    markdown_text="",
    chunks=[
        TaskUpdateChunk(
            id="12",
            title="adding numbers...",
            status="in_progress",
            details="sums have increased",
        )
    ],
)

time.sleep(4)

client.chat_stopStream(
    channel=channel_id,
    ts=streamer.get("ts"),
    chunks=[
        TaskUpdateChunk(
            id="12",
            title="solved equation!",
            status="complete",
            sources=[
                URLSource(
                    url="https://oeis.org",
                    text="The On-Line Encyclopedia of Integer Sequences (OEIS)",
                ),
            ],
        ),
        MarkdownTextChunk(text="that computes."),
    ],
)