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docs(streaming): document Telegram block-mode preview chunk sizing
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docs/concepts/streaming.md

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@@ -161,6 +161,7 @@ Telegram:
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- Uses `sendMessage` + `editMessageText` preview updates across DMs and group/topics.
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- Final text edits the active preview in place; long finals reuse that message for the first chunk and send only the remaining chunks.
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- `block` mode rotates the preview into a new message at `streaming.preview.chunk.maxChars` (default 800, capped at Telegram's 4096 edit limit); other modes grow one preview up to 4096 characters.
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- `progress` mode keeps tool progress in an editable status draft, clears that draft at completion, and sends the final answer through normal delivery.
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- If the final edit fails before the completed text is confirmed, OpenClaw uses normal final delivery and cleans up the stale preview.
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- Preview streaming is skipped when Telegram block streaming is explicitly enabled (to avoid double-streaming).

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