Automate Threads with Gemini CLI
Threads carries twice as much media in a single post as anything else here, on one of the tightest text limits.
$ gemini mcp add --transport http antwork https://api.antwork.io/mcpGemini CLI adds Antwork over HTTP with one command, then authorizes with its own slash command. Two lines and you are posting from the terminal.
Connect it
What you can say once Threads is connected
What is different about Threads
Twenty items in one post
Twenty images or videos, mixed however you like. Nothing else Antwork posts to comes close; the next highest stops at ten, and most stop at one.
The text is the caption, not the post
Five hundred characters is the second tightest limit here. The agent drafts to it instead of writing long and trimming, because on Threads the media carries the post and the text introduces it.
The largest payload Antwork will build
Each video can run five minutes at 1 GB, and there can be twenty of them. No other post this platform builds can be that big.
The same shapes Instagram takes
Video ratios are 9:16, 1:1 and 4:5, matching Instagram exactly. A cut made for one reposts to the other without recutting, which is the usual reason to run them as a pair.
Threads limits, as the server enforces them
Posts are capped at 500 characters, and the cap is enforced when you schedule or publish, not silently truncated.
- Max size
- 8 MB
- Per post
- 20
- Ceiling
- up to 1080x1080 · 1:1 / 4:5 / 1.91:1
- Max size
- 1 GB
- Per post
- 20
- Ceiling
- up to 1080x1920 · 5 min max · 9:16 / 1:1 / 4:5
- — 20 media items per post, in total.
- — Images and video can share a post.
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 Gemini CLI?
- 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 Gemini CLI 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 Threads that includes writing to the length the format rewards, up to 500 characters.
Never leave Gemini CLI to post again.
One command, one consent screen, and Threads is something you can just ask for.