lark-im

im (v1)

CRITICAL — 开始前 MUST 先用 Read 工具读取 ../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.

Resource Relationships

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

Important Notes

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 with Bot Identity

When using bot identity (--as bot) to fetch messages (e.g. +chat-messages-list, +threads-messages-list, +messages-mget), sender names may not be resolved (shown as open_id instead of display name). This happens when the bot cannot access the user's contact info.

Root cause: The bot's app visibility settings do not include the message sender, so the contact API returns no name.

Solution: Check the app's visibility settings in the Lark Developer Console — ensure the app's visible range covers the users whose names need to be resolved. Alternatively, use --as user to fetch messages with user identity, which typically has broader contact access.

Card Messages (Interactive)

Card messages (interactive type) are not yet supported for compact conversion in event subscriptions. The raw event data will be returned instead, with a hint printed to stderr.

Shortcuts（推荐优先使用）

Shortcut 是对常用操作的高级封装（lark-cli im +<verb> [flags]）。有 Shortcut 的操作优先使用。

Shortcut	说明
+chat-create	Create a group chat; user/bot; creates private/public chats, invites users/bots, optionally sets bot manager
+chat-messages-list	List messages in a chat or P2P conversation; user/bot; accepts --chat-id or --user-id, resolves P2P chat_id, supports time range/sort/pagination
+chat-search	Search visible group chats by keyword and/or member open_ids (e.g. look up chat_id by group name); user/bot; supports member/type filters, sorting, and pagination
+chat-update	Update group chat name or description; user/bot; updates a chat's name or description
+messages-mget	Batch get messages by IDs; user/bot; fetches up to 50 om_ message IDs, formats sender names, expands thread replies
+messages-reply	Reply to a message (supports thread replies); user/bot; supports text/markdown/post/media replies, reply-in-thread, idempotency key
+messages-resources-download	Download images/files from a message; user/bot; supports automatic chunked download for large files (8MB chunks), auto-detects file extension from Content-Type
+messages-search	Search messages across chats (supports keyword, sender, time range filters) with user identity; user-only; filters by chat/sender/attachment/time, supports auto-pagination via --page-all / --page-limit, enriches results via batched mget and chats batch_query
+messages-send	Send a message to a chat or direct message; user/bot; sends to chat-id or user-id with text/markdown/post/media, supports idempotency key
+threads-messages-list	List messages in a thread; user/bot; accepts om_/omt_ input, resolves message IDs to thread_id, supports sort/pagination

API Resources

lark-cli schema im.<resource>.<method>   # 调用 API 前必须先查看参数结构
lark-cli im <resource> <method> [flags] # 调用 API

重要：使用原生 API 时，必须先运行 schema 查看 --data / --params 参数结构，不要猜测字段格式。

chats

• create — 创建群。Identity: bot only (tenant_access_token).
• get — 获取群信息。Identity: supports user and bot; the caller must be in the target chat to get full details, and must belong to the same tenant for internal chats.
• link — 获取群分享链接。Identity: supports user and bot; the caller must be in the target chat, must be an owner or admin when chat sharing is restricted to owners/admins, and must belong to the same tenant for internal chats.
• list — 获取用户或机器人所在的群列表。Identity: supports user and bot.
• update — 更新群信息。Identity: supports user and bot.

chat.members

• create — 将用户或机器人拉入群聊。Identity: supports user and bot; the caller must be in the target chat; for bot calls, added users must be within the app's availability; for internal chats the operator must belong to the same tenant; if only owners/admins can add members, the caller must be an owner/admin, or a chat-creator bot with im:chat:operate_as_owner.
• delete — 将用户或机器人移出群聊。Identity: supports user and bot; only group owner, admin, or creator bot can remove others; max 50 users or 5 bots per request.
• get — 获取群成员列表。Identity: supports user and bot; the caller must be in the target chat and must belong to the same tenant for internal chats.

messages

• delete — 撤回消息。Identity: supports user and bot; for bot calls, the bot must be in the chat to revoke group messages; to revoke another user's group message, the bot must be the owner, an admin, or the creator; for user P2P recalls, the target user must be within the bot's availability.
• forward — 转发消息。Identity: bot only (tenant_access_token).
• merge_forward — 合并转发消息。Identity: bot only (tenant_access_token).
• read_users — 查询消息已读信息。Identity: bot only (tenant_access_token); the bot must be in the chat, and can only query read status for messages it sent within the last 7 days.

reactions

• batch_query — 批量获取消息表情。Identity: supports user and bot.Must-read
• create — 添加消息表情回复。Identity: supports user and bot; the caller must be in the conversation that contains the message.Must-read
• delete — 删除消息表情回复。Identity: supports user and bot; the caller must be in the conversation that contains the message, and can only delete reactions added by itself.Must-read
• list — 获取消息表情回复。Identity: supports user and bot; the caller must be in the conversation that contains the message.Must-read

images

• create — 上传图片。Identity: bot only (tenant_access_token).

pins

• create — Pin 消息。Identity: supports user and bot.
• delete — 移除 Pin 消息。Identity: supports user and bot.
• list — 获取群内 Pin 消息。Identity: supports user and bot.

权限表

方法	所需 scope
chats.create	im:chat:create
chats.get	im:chat:read
chats.link	im:chat:read
chats.list	im:chat:read
chats.update	im:chat:update
chat.members.create	im:chat.members:write_only
chat.members.delete	im:chat.members:write_only
chat.members.get	im:chat.members:read
messages.delete	im:message:recall
messages.forward	im:message
messages.merge_forward	im:message
messages.read_users	im:message:readonly
reactions.batch_query	im:message.reactions:read
reactions.create	im:message.reactions:write_only
reactions.delete	im:message.reactions:write_only
reactions.list	im:message.reactions:read
images.create	im:resource
pins.create	im:message.pins:write_only
pins.delete	im:message.pins:write_only
pins.list	im:message.pins:read