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docs(slack): note caption ordering and streaming fallback for unfurl knobs

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When either unfurl key is set, media captions post as a separate
message before the file (the upload API cannot carry unfurl controls)
and native draft streaming falls back to edit-based delivery. Surface
both side effects in the config reference table.
This commit is contained in:
Ben Barclay
2026-08-27 09:31:11 +10:00
committed by Ben Barclay
parent be5c75165f
commit ff9930037b
1 changed files with 2 additions and 2 deletions
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website/docs/user-guide/messaging/slack.md
+2 -2
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@@ -464,8 +464,8 @@ platforms:
| `platforms.slack.reply_to_mode` | `"first"` | Threading mode for multi-part messages: `"off"`, `"first"`, or `"all"` |
| `platforms.slack.extra.reply_in_thread` | `true` | When `false`, channel messages get direct replies instead of threads. Messages inside existing threads still reply in-thread. |
| `platforms.slack.extra.reply_broadcast` | `false` | When `true`, thread replies are also posted to the main channel. Only the first chunk is broadcast. |
| `platforms.slack.extra.unfurl_links` | Slack default | Set to `false` to suppress automatic previews for linked web pages while preserving clickable links. |
| `platforms.slack.extra.unfurl_media` | Slack default | Set to `false` to suppress automatic media previews while preserving clickable links. |
| `platforms.slack.extra.unfurl_links` | Slack default | Set to `false` to suppress automatic previews for linked web pages while preserving clickable links. When either unfurl key is set, media captions are posted as a separate message *before* the file (Slack's upload API cannot carry unfurl controls), and native draft streaming falls back to edit-based delivery. |
| `platforms.slack.extra.unfurl_media` | Slack default | Set to `false` to suppress automatic media previews while preserving clickable links. Same caption-ordering and streaming notes as `unfurl_links`. |
| `platforms.slack.extra.rich_blocks` | `false` | When `true`, agent messages are rendered as [Block Kit](https://docs.slack.dev/block-kit/) blocks (headers, dividers, true nested lists, and native tables). A plain-text fallback is always sent. Tables over Slack's limits fall back to aligned monospace. No app reinstall required — it's a send-side change only. |
| `platforms.slack.extra.feedback_buttons` | `false` | When `true` with `rich_blocks`, appends Slack-native feedback controls to final replies. |
| `platforms.slack.extra.native_task_cards` | `false` | When `true`, renders live tool calls as Slack-native plan/task cards. This is an explicit progress opt-in independent of Slack's default `tool_progress: off`; native API failures fall back to one continuously edited text update. |