Bots with Agents & Assistants may trigger the same event multiple times.

[tatsuyainui-opt]

I created a ChatBot using the Agents & Assistants functionality, but multiple events are triggered for one message under the following conditions. (We have confirmed this with other bots already published on the marketplace)
The headers of these events did not include X-Slack-Retry-Num.

Is there a way to resolve this issue?

Reproducible in:

It seems to occur for messages that meet the following conditions:

1. First message from user
2. Long Japanese message

Example:

こんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちは

The slack_bolt version

slack_bolt==1.21.2

Python runtime version

Python 3.12.6

OS info

ProductName:		macOS
ProductVersion:		14.6.1
BuildVersion:		23G93
Darwin Kernel Version 23.6.0: Mon Jul 29 21:16:46 PDT 2024; root:xnu-10063.141.2~1/RELEASE_ARM64_T8112

Steps to reproduce:

code

app = App(
    signing_secret=signing_secret,
    token=token,
)

assistant = Assistant()

@assistant.user_message
def respond_in_assistant_thread(
    set_status,
    say,
):
    set_status("is typing...")

    say("This is a test message")


app.assistant(assistant)

1. Start App
2. Send the following message in a new chat

こんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちはこんにちは

Expected result:

"This is a test message" will only be sent once.

Actual result:

"This is a test message" will be sent multiple times.

Requirements

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[seratch]

Hi @tatsuyainui-opt, thank you for writing in. Unfortunately, there isn't a way for custom apps to prevent this behavior. When a user posts an exceptionally long message to Slack, it can be split into multiple messages. This may result in multiple different message events being delivered to your app.

As a workaround, your app might want to use the conversations.replies API w/ channel_id and thread_ts. This way, your app can identify messages that serve a single purpose. I understand this isn't ideal, but I hope it helps.

[tatsuyainui-opt]

Hi @seratch, thank you for your reply. I understand that the issue is related to the server side of the custom app.
I have an additional question:

Q: The events text is not split and contains the complete user message. Therefore, I don't see a need to send different events. Will this behavior ever change in the future?

As a workaround, your app might want to use the conversations.replies API w/ channel_id and thread_ts.

Yes, thank you! I am currently using that, but I still like the custom app and hope to use it again someday.

[seratch]

The events text is not split and contains the complete user message. Therefore, I don't see a need to send different events. Will this behavior ever change in the future?

If this happens, that's a differen scenario than what I mentioned above, and I don't have any information about it. Could you contact our customer support team instead? They can check Slack's server side logs to identify what's happening with your app.

[tatsuyainui-opt]

Understood. Thank you so much.