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To make a Slack bot answer in audio, have it receive a message event, acknowledge Slack promptly, generate a spoken version of its reply with a text-to-speech (TTS) service, and upload the audio using Slack’s current external file-upload workflow. The key design choice is how the bot receives events; the key implementation detail is that speech generation and file transfer should happen after, not before, the event acknowledgement.
Choose how the bot receives Slack events
Slack can deliver Events API payloads to a public HTTP endpoint or through Socket Mode. Choose based on your deployment: an HTTP endpoint must be publicly reachable, while Socket Mode is an alternative when exposing a public endpoint is undesirable or impractical. Slack documents both approaches in its Events API guide.
Subscribe only to the conversation types where the bot is meant to respond. Slack’s message-event reference separates public-channel messages (message.channels), direct messages (message.im), private-channel messages (message.groups), and multiparty direct messages (message.mpim). Event delivery depends on the app’s scopes, authorization, and access to the conversation; a subscription does not grant visibility into every workspace message. See Slack’s message event reference.
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Decide separately what triggers a spoken reply. The bot might respond only when mentioned, after a shortcut, or to every eligible message. That is a product behavior choice, not a requirement of Slack’s event system.
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Acknowledge the event before doing slow work
Slack expects an Events API request to receive an HTTP 2xx acknowledgement within three seconds. Speech generation and uploading a file can take longer, so do not hold the event request open while those tasks run. Slack recommends separating acknowledgement from application processing; a queue or background worker is a common way to do that. Failed event deliveries are retried three times with exponential backoff, so design processing to avoid duplicate replies when an event is delivered again. See Slack’s Events API guide and acknowledgement guidance.
- Receive the event through your chosen delivery mode and validate that it is a message your bot should handle.
- Apply your deduplication strategy, then acknowledge the event promptly.
- Queue or otherwise hand off the work to background processing.
- Generate the reply text, synthesize it as audio, and share the resulting file.
Generate audio from the reply text
After deciding what the bot should say, send that text to a TTS service. For example, OpenAI’s speech endpoint accepts input text, a model, and a voice, and returns audio content or a stream. Its API reference sets a maximum input length of 4096 characters. If a generated response exceeds the selected provider’s input limit, shorten or split the text according to that provider’s guidance rather than assuming the endpoint will accept it. See the speech API reference.
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Choose an output format supported by the TTS provider and suitable for your app. OpenAI’s guide says the endpoint defaults to MP3 and supports alternative formats including WAV and PCM; it recommends WAV or PCM for fastest response times. That is OpenAI’s recommendation, not a universal rule for every provider or Slack client. Check the current Text to speech guide for supported options.
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Upload and share the audio with Slack’s current workflow
Do not build a new integration around Slack’s legacy files.upload method: Slack says it was sunset on November 12, 2025. The supported flow is to obtain an upload URL, send the audio bytes to it, and then complete the upload with the intended destination. The upload methods require the files:write scope. See Slack’s files.getUploadURLExternal, files.completeUploadExternal, and upload-method changelog.
- Call
files.getUploadURLExternalwith a filename and the audio file’s size in bytes. Save the upload URL and file ID returned by Slack. - POST the audio bytes to the returned upload URL and check the HTTP result before continuing.
- Call
files.completeUploadExternalwith the file ID and the target channel or conversation. Include an optional title orinitial_commentto introduce the audio and disclose that it is AI-generated.
Specify the destination when completing the upload if the file should be shared in a conversation. Slack says that without a channel specified, the uploaded file remains private. If the bot should send a separate text message as well as the audio, use chat.postMessage; bot tokens need chat:write for that method. The upload method’s initial comment can instead keep the audio and its context together. See Slack’s chat.postMessage reference.
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Handle common failures without losing the reply
- Event acknowledgement times out: move TTS and upload work out of the request handler so the event can be acknowledged within Slack’s three-second window.
- Duplicate event delivery: Slack may retry a failed delivery, so track processed events or otherwise make your background work idempotent.
- Upload is rejected: verify the audio byte count, file type, upload response, and the scopes granted to the app. Slack’s upload reference documents errors such as missing scope, invalid channel, and unsupported file type.
- The file uploads but is not visible in the conversation: confirm that
files.completeUploadExternalspecified the intended channel or conversation and that the bot has access to it. - Text message cannot be posted: check that the bot token has
chat:writeif usingchat.postMessage. - TTS request fails or text is too long: check the selected provider’s current model, voice, format, and input constraints; shorten or split the reply where appropriate.
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