Post to X from Codex

Attach PostWharf to Codex once, then publish or schedule X posts, threads and video by asking for them — and get a receipt saying what actually landed.

Connect it

Point the connector at the hosted server and the tools appear alongside the rest. One workspace key scopes every call to a single brand, so Codex can only ever reach the accounts in that workspace — not every account you run.

# Point the connector at:
https://mcp.postwharf.com/mcp
# with the header:
Authorization: Bearer YOUR_WORKSPACE_KEY

Ask for an X post

Once the server is attached the ask is a prompt, not a form — alongside whatever else the agent has been asked to finish:

"Turn these release notes into a four-post thread and queue it for 9am tomorrow."

Codex finds your connected X channel, checks the text against the 280-character ceiling before anything is queued, and hands back the queued time. Nothing publishes because a model decided it should.

Treat the post as the last step of a task rather than a task of its own. The agent already knows what it just did, which is most of what the announcement needs to say.

What X accepts

Character limit280
Counted onone post in a thread
Formatsposts, threads and video

X bills per post at the API level, and link posts cost more than plain text.

What comes back

Every post carries a delivery receipt per channel: the state, the live URL once it is out, and the platform's own reason if it failed. Deliveries are re-checked after publishing, so an X post removed later stops reporting as live instead of sitting in your history as a success. Ask Codex for the status and it reads that receipt back rather than guessing.

Questions

Can Codex post to X automatically?

Yes. Connect the PostWharf MCP server to Codex and it can publish or schedule to a connected X channel, then read the delivery receipt back. The workspace key limits it to the accounts in one workspace, and you keep the approval step.

What do I need before X will work?

X bills per post at the API level, and link posts cost more than plain text. Once the channel is connected in PostWharf, Codex reaches it the same way it reaches every other network.

How long can a X post be?

280 characters, counted on one post in a thread. PostWharf checks that before the post is queued, so an over-length post is refused immediately rather than failing at X after everything else in the same batch has already published.