Automate X (Twitter) with ChatGPT
X is the only platform that does not count characters the way you do, and the only one where a GIF is its own kind of attachment.
https://api.antwork.io/mcpChatGPT reaches Antwork through a custom app in Developer mode. It is the longest setup of any client here, and the only one where you build the connector yourself rather than pasting a single line.
Custom connectors are a paid ChatGPT feature, and Developer mode has to be switched on first.
Connect it
What you can say once X (Twitter) is connected
What is different about X (Twitter)
The counter does not match yours
X weighs characters rather than counting them. Every URL counts as 23 however long it is, and anything outside the Latin range counts double. Antwork counts the same way the server does, so a draft that fits here is a draft that posts.
A GIF is not an image
X is the only platform where Antwork treats GIF as its own media type with its own ceiling: one per post, up to 15 MB, and never beside a photo or a video.
Four slots, and they do not mix
Up to four images in a post, but images and video can never share one. Ask for both and the agent splits them before it drafts rather than failing at publish.
It takes a PDF, but on its own
X accepts a document post up to 100 MB. Unlike LinkedIn it cannot ride alongside images, so a document here is the whole post or none of it.
X (Twitter) limits, as the server enforces them
Posts are capped at 280 characters, and the cap is enforced when you schedule or publish, not silently truncated. X counts weighted rather than by character: every URL counts as 23 regardless of length, and non-Latin characters count double.
- Max size
- 5 MB
- Per post
- 4
- Ceiling
- up to 1920x1080 · 16:9 / 1:1
- Max size
- 15 MB
- Per post
- 1
- Ceiling
- up to 1920x1080 · 16:9 / 1:1
- Max size
- 512 MB
- Per post
- 1
- Ceiling
- up to 1920x1080 · 2 min max · 16:9 / 1:1
- Max size
- 100 MB
- Per post
- 1
- Ceiling
- —
- — 4 media items per post, in total.
- — Images and video can never share a post. Ask for both and it has to be split into two.
- — A document cannot be attached alongside other media.
These numbers are read at build time from the same rules file the publishers validate against, so this page cannot claim a limit the server does not enforce.
Questions
- Do I need an API key to connect ChatGPT?
- No. Antwork connects over OAuth — you approve a consent screen in the browser and you are done. There is no key to generate or paste into a URL, which is how most social MCP servers handle it.
- Do I need a paid account?
- No. The free tier covers one workspace, two connected accounts and 20 posts per cycle, and there is no plan gate on MCP access.
- Will ChatGPT post without showing me first?
- Not unless you ask it to. Drafting and publishing are two separate steps: the agent writes, renders the post card, and only publishes when you confirm.
- Does the writing sound like AI?
- Antwork learns a voice profile per connected account by reading what you have already published there, and the agent drafts from that profile. On X (Twitter) that includes writing to the length the format rewards, up to 280 characters.
Never leave ChatGPT to post again.
One command, one consent screen, and X (Twitter) is something you can just ask for.