Send an expressive sticker (meme/表情包) that renders as an image in the chat. Use this proactively whenever a sticker would make the reply more fun or expressive — reacting to good/bad news, greeting, teasing, celebrating, comforting. Pick query based on the conversation's mood (an emotion or scene word such as 开心 / 委屈 / 干杯 / good night). If you have not seen the library yet in this conversation, call list_available_stickers first and choose a tag from it. If several stickers match, a random one is chosen — you can pass stickerId to force an exact sticker.

List every sticker in the library with its id, name and emotion/scene tags. Call this once early in a conversation (or when send_sticker reports no match) so you know which moods you can express; afterwards you can call send_sticker directly.

Add an image to the sticker library from an existing public http(s) image URL only. Do not pass data:image URIs or base64 here. If you have the user's attached image bytes/file, call create_sticker_upload instead and upload the original bytes directly to this sticker library. Do not use third-party image hosts. If the user already described what the image is, do not spend tokens visually analyzing it; use the user's description to choose the name and tags. If the user did not describe it, inspect the image enough to choose a short name plus 1-8 emotion/scene tags. Supported formats: png / jpeg / gif / webp / avif, max 8MB.

Create a one-time upload URL on this sticker library for the user's attached image bytes/file. Use this when adding a sticker from an attachment. After this tool returns, upload the original image bytes directly to uploadUrl with HTTP PUT and Content-Type image/png, image/jpeg, image/gif, image/webp, or image/avif. The sticker is saved as soon as the PUT succeeds; do not call add_sticker afterwards. Do not upload the image to third-party image hosts. Do not curl the MCP endpoint. If the user already told you what the image is, skip visual analysis and use that description for the name and tags. If not, inspect the image enough to name and tag it. The URL expires in 10 minutes.

Add a new sticker from an image file on this computer (local/stdio mode only). Use when the user gives a local file path. Supported: png / jpeg / gif / webp / avif, max 8MB.