Lark Im

# im (v1)

**CRITICAL — 开始前 MUST 先用 Read 工具读取 [`../lark-shared/SKILL.md`](../lark-shared/SKILL.md)，其中包含认证、权限处理**

## Core Concepts

- **Message**: A single message in a chat, identified by `message_id` (om_xxx). Supports types: text, post, image, file, audio, video, sticker, interactive (card), share_chat, share_user, merge_forward, etc. - **Chat**: A group chat or P2P conversation, identified by `chat_id` (oc_xxx). - **Thread**: A reply thread under a message, identified by `thread_id` (om_xxx or omt_xxx). - **Reaction**: An emoji reaction on a message. - **Flag**: A bookmark on a message or thread. - **Feed Shortcut**: A chat pinned to the current user's feed sidebar, identified by `feed_card_id` (an `oc_xxx` open_chat_id for CHAT type). - **Feed Group**: A tag that groups feed cards in the feed list, identified by `feed_group_id` (ofg_xxx). Members are feed cards, each identified by `feed_id` + `feed_type`. Two types: `normal` (members managed explicitly) and `rule` (members auto-derived from rules).

## Resource Relationships

``` Chat (oc_xxx) ├── Message (om_xxx) │ ├── Thread (reply thread) │ ├── Reaction (emoji) │ └── Resource (image / file / video / audio) └── Member (user / bot) ```

## Important Notes

### AppLink and Share Links

Prefer CLI-returned links: use `chat_app_link` to open joined conversations, `message_app_link` to open messages, and `share_link` to invite others to groups. If manually building a joined-conversation AppLink, use `https://<applink_host>/client/chat/open?openChatId=<oc_xxx>`, never `chatId=<oc_xxx>` or `lark://...chat_id=<oc_xxx>`.

### Identity and Token Mapping

- `--as user` means **user identity** and uses `user_access_token`. Calls run as the authorized end user, so permissions depend on both the app scopes and that user's own access to the target chat/message/resource. - `--as bot` means **bot identity** and uses `tenant_access_token`. Calls run as the app bot, so behavior depends on the bot's membership, app visibility, availability range, and bot-specific scopes. - If an IM API says it supports both `user` and `bot`, the token type changes who the operator is. The same API can succeed with one identity and fail with the other because owner/admin status, chat membership, tenant boundary, or app availability are checked against the current caller.

### Sender Name Resolution

When fetching messages (`+chat-messages-list`, `+threads-messages-list`, `+messages-mget`, `+messages-search`), the CLI shows a display name for both user and bot senders:

- **Server-provided name**: the read APIs return `sender_name` (plus the full-i18n `sender_i18n_names` map) on each message `sender`; the CLI surfaces it as the sender's `name` for users and bots alike. No name lookup and no extra permission are needed — **no contact scope** and no `application:bot.basic_info:read`. - **Fallback to id**: when the server does not provide a name, the sender is shown by its id and the command still exits 0. There is no contact-directory fallback.

The raw `sender_name` is not duplicated in output (its value is in `name`); the full `sender_i18n_names` map (all locales) is preserved for consumers that need a specific language, alongside an optional `open_bot_id` (`ou_`) for bot senders aligned with the message-receive event channel. System messages (`msg_type: system`) have no sender name — that is normal, not an error.

### Default message enrichment (reactions / update_time)

The four message-pulling shortcuts (`+messages-mget`, `+chat-messages-list`, `+messages-search`, `+threads-messages-list`) automatically attach a `reactions` block and (for edited messages) `update_time` to each returned message — no separate `im.reactions.batch_query` call is needed. Pass `--no-reactions` to opt out. For the full contract (output shape, the `im:message.reactions:read` scope requirement, and the "missing field ≠ fetch failure" data rules), read [`references/lark-im-message-enrichment.md`](references/lark-im-message-enrichment.md).

### Compact message output (`--concise`)

Some message-listing shortcuts support `--concise` for compact Markdown output. Use it when the user asks for concise output or a smaller result/file; check `--help` for availability and do not combine it with an explicit `--format`, an enabled `--json`, or a non-empty `--jq`.

### Opt-in resource auto-download (`--download-resources`)

`+chat-messages-list`, `+messages-mget`, and `+threads-messages-list` accept `--download-resources` to save eligible attachments into `./lark-im-resources/` and add a `resources` array to each message. It is off by default; stickers are not downloadable. A failed attachment is reported on that resource without aborting the message pull. Use [`+messages-resources-download`](references/lark-im-messages-resources-download.md) for one attachment. See [`references/lark-im-message-enrichment.md`](references/lark-im-message-enrichment.md) for the output contract.

**Folder resources** are containers, no