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fix(slack): continue streams across replies #601

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fix(slack): continue streams across replies #601

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d177cf6
fix(slack): continue oversized streams
dancer Jun 9, 2026
08ecb95
docs(slack): document stream continuation
dancer Jun 9, 2026
38980d5
fix(slack): preserve exact-boundary fences
dancer Jun 9, 2026
246e5ed
fix(slack): continue task cards across replies
dancer Jun 9, 2026
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5 changes: 5 additions & 0 deletions .changeset/petite-wombats-hang.md
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---
"@chat-adapter/slack": patch
---

continue Slack streams across replies when text or task content exceeds platform limits
4 changes: 4 additions & 0 deletions apps/docs/content/docs/streaming.mdx
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Expand Up @@ -152,6 +152,10 @@ await thread.post(stream);
| `task_update` | `id`, `title`, `status`, `details?`, `output?` | Tool/step progress updates (`pending`, `in_progress`, `complete`, `error`) with optional extra task context |
| `plan_update` | `title` | Plan title updates on supported platforms |

Slack limits native streamed text fields to 12,000 characters, task or plan chunks to 256 characters, and messages to 50 blocks. Chat SDK handles these limits automatically. Long text continues in ordered replies, long task details and output continue in additional task cards, and task or plan titles are shortened to fit. When a stream reaches 50 task cards, later tasks continue in another reply and updates remain attached to the reply containing the original task card.

When Slack creates continuation replies, `thread.post()` returns the final reply. Stop blocks are attached to that final reply.

### Streaming with options

Wrap a stream in a `StreamingPlan` to pass platform-specific options through `thread.post()` without dropping down to `adapter.stream()` directly:
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