docs: cover BB tapback fallback, iMessage/SMS routing, Mattermost streaming, Matrix mention-prefixed slash

docs/channels/bluebubbles.md

@@ -363,7 +363,7 @@ BlueBubbles supports advanced message actions when enabled in config:
 
 Available actions:
 
-- **react**: Add/remove tapback reactions (`messageId`, `emoji`, `remove`)
+- **react**: Add/remove tapback reactions (`messageId`, `emoji`, `remove`). iMessage's native tapback set is `love`, `like`, `dislike`, `laugh`, `emphasize`, and `question`. When an agent picks an emoji outside that set (for example `👀`), the reaction tool falls back to `love` so the tapback still renders instead of failing the whole request. Configured ack reactions still validate strictly and error on unknown values.
 - **edit**: Edit a sent message (`messageId`, `text`)
 - **unsend**: Unsend a message (`messageId`)
 - **reply**: Reply to a specific message (`messageId`, `text`, `to`)
@@ -554,6 +554,10 @@ Prefer `chat_guid` for stable routing:
 - Direct handles: `+15555550123`, `user@example.com`
   - If a direct handle does not have an existing DM chat, OpenClaw will create one via `POST /api/v1/chat/new`. This requires the BlueBubbles Private API to be enabled.
 
+### iMessage vs SMS routing
+
+When the same handle has both an iMessage and an SMS chat on the Mac (for example a phone number that is iMessage-registered but has also received green-bubble fallbacks), OpenClaw prefers the iMessage chat and never silently downgrades to SMS. To force the SMS chat, use an explicit `sms:` target prefix (for example `sms:+15555550123`). Handles without a matching iMessage chat still send through whatever chat BlueBubbles reports.
+
 ## Security
 
 - Webhook requests are authenticated by comparing `guid`/`password` query params or headers against `channels.bluebubbles.password`.

docs/channels/matrix.md

@@ -884,6 +884,12 @@ Per-account override:
 
 Related docs: [Exec approvals](/tools/exec-approvals)
 
+## Slash commands
+
+Matrix slash commands (for example `/new`, `/reset`, `/model`) work directly in DMs. In rooms, OpenClaw also recognizes slash commands that are prefixed with the bot's own Matrix mention, so `@bot:server /new` triggers the command path without needing a custom mention regex. This keeps the bot responsive to room-style `@mention /command` posts that Element and similar clients emit when a user tab-completes the bot before typing the command.
+
+Authorization rules still apply: command senders must satisfy DM or room allowlist/owner policies just like plain messages.
+
 ## Multi-account
 
 ```json5

docs/channels/mattermost.md

@@ -244,6 +244,31 @@ Notes:
 - Retries apply to transient failures such as rate limits, 5xx responses, and network or timeout errors.
 - 4xx client errors other than `429` are treated as permanent and are not retried.
 
+## Preview streaming
+
+Mattermost streams thinking, tool activity, and partial reply text into a single **draft preview post** that finalizes in place when the final answer is safe to send. The preview updates on the same post id instead of spamming the channel with per-chunk messages.
+
+Enable via `channels.mattermost.streaming`:
+
+```json5
+{
+  channels: {
+    mattermost: {
+      streaming: "partial", // off | partial | block | progress
+    },
+  },
+}
+```
+
+Notes:
+
+- `partial` is the usual choice: one preview post that is edited as the reply grows, then finalized with the complete answer.
+- `block` uses append-style draft chunks inside the preview post.
+- `progress` shows a status preview while generating and only posts the final answer at completion.
+- `off` disables preview streaming.
+- If the stream cannot be finalized in place (for example the post was deleted mid-stream), OpenClaw falls back to sending a fresh final post so the reply is never lost.
+- See [Streaming](/concepts/streaming#preview-streaming-modes) for the channel-mapping matrix.
+
 ## Reactions (message tool)
 
 - Use `message action=react` with `channel=mattermost`.

docs/concepts/streaming.md

@@ -118,11 +118,12 @@ Modes:
 
 ### Channel mapping
 
-| Channel  | `off` | `partial` | `block` | `progress`        |
-| -------- | ----- | --------- | ------- | ----------------- |
-| Telegram | ✅    | ✅        | ✅      | maps to `partial` |
-| Discord  | ✅    | ✅        | ✅      | maps to `partial` |
-| Slack    | ✅    | ✅        | ✅      | ✅                |
+| Channel    | `off` | `partial` | `block` | `progress`        |
+| ---------- | ----- | --------- | ------- | ----------------- |
+| Telegram   | ✅    | ✅        | ✅      | maps to `partial` |
+| Discord    | ✅    | ✅        | ✅      | maps to `partial` |
+| Slack      | ✅    | ✅        | ✅      | ✅                |
+| Mattermost | ✅    | ✅        | ✅      | ✅                |
 
 Slack-only:
 
@@ -155,6 +156,11 @@ Slack:
 - `block` uses append-style draft previews.
 - `progress` uses status preview text, then final answer.
 
+Mattermost:
+
+- Streams thinking, tool activity, and partial reply text into a single draft preview post that finalizes in place when the final answer is safe to send.
+- Falls back to sending a fresh final post if the preview post was deleted or is otherwise unavailable at finalize time.
+
 ## Related
 
 - [Messages](/concepts/messages) — message lifecycle and delivery