Streaming and delivery

The bridge streams the agent's answer through live message edits, then splits the final response with the adapter's splitMessage(). See Channel agent for service setup and the full option reference.

Streaming and long messages

Streaming is on by default; it turns off only when you set streaming.enabled: false or the model advertises capabilities.streaming: false. While a run streams, the service edits the placeholder message at most once per editIntervalMs (default 750 ms) and only the first message part. Placeholder delivery requires channel.edit; without it the service buffers and sends only the final response. When the adapter supports it, the service also triggers the platform typing indicator while the run works; typing failures are observed, never fatal.

Disable the placeholder to skip the provisional message entirely:

const service = createChannelAgent({
  channel,
  agent,
  streaming: { placeholder: false },
})

The final response is split by the adapter's splitMessage() (Discord 2,000, Slack 4,000, Telegram 4,096 characters). When a placeholder is on screen, its message is edited into the first part and the remaining parts are sent as new messages.

renderOutcome may return a string or a complete ChannelMessage:

const service = createChannelAgent({
  channel,
  agent,
  renderOutcome({ outcome }) {
    if (outcome.type !== 'response') return outcome.text

    return {
      text: outcome.text,
      attachments: [
        {
          type: 'file',
          mediaType: 'application/json',
          filename: 'result.json',
          source: {
            type: 'data',
            data: Buffer.from(JSON.stringify(outcome.output)).toString('base64'),
          },
        },
      ],
    }
  },
})

A rich final message with attachments is sent first and the placeholder is then deleted, which requires the adapter's delete capability. Attachment-capable adapters without delete support never get a placeholder in the first place.

Continue with

• Prompts and attachments — what feeds the run being streamed.
• Slash commands and acknowledgements — command prompts and working reactions.