Postnavo is launching with X scheduling: single posts and full threads from one calendar, written by you or drafted by your AI agent. X’s create-post call takes one post at a time and has no scheduled time, so the scheduler does the waiting.
280 characters for standard accounts; links count as 23 and emoji as 2. Check your post length
Read on 2026-10-12. Where X’s pages are silent, so is this one.
| Rule | What X documents |
|---|---|
| Account and access | With OAuth 2.0, posting takes a user token with the tweet.read, tweet.write and users.read scopes.2 |
| Post text | 280 characters, weighted: Latin letters and punctuation count 1, emoji and Chinese, Japanese and Korean glyphs count 2, and every link counts 23 whatever its length.1 |
| Longer posts | X Premium subscribers can write up to 25,000 characters. X says longer posts cannot yet be scheduled.910 |
| Media in one post | Up to 4 photos, or 1 animated GIF, or 1 video. Images up to 5 MB, GIFs up to 15 MB, video from half a second to 20 minutes and 8 GB (125 minutes and 16 GB for Premium or verified accounts).25 |
| Alt text | 1,000 characters for an image description.6 Alt Text Character Limits for Every Social Network |
| X’s own scheduler | X Pro schedules posts for each account it manages, and the Composer in an X Ads account schedules a post for a date and time. Neither page says how far ahead.78 How Far Ahead Can You Schedule Posts on Each Network? |
| Published limits | Creating posts through the API: 100 requests per 15 minutes for one user and 10,000 per 24 hours for one app.3 |
| What X charges an app | The API is pay-per-usage: $0.015 for each post created and $0.20 for a post that contains a link, on X’s pricing page, which says prices can change.4 |
| AI and bot labels | The create call has a made_with_ai field that discloses AI-generated media. An account run as a bot must say so, and who is responsible for it.213 |
One endpoint creates a post. It takes text, up to four photos or one GIF or one video, a poll of two to four options (each 1 to 25 characters, open from 5 minutes to 7 days), a setting for who may reply and a community to post into.
The create-post call has no field for a future time, so a scheduler that uses it stores the post and sends it when its time comes. X’s Ads API, a separate product, has a scheduled-posts endpoint for X Ads accounts.
X publishes two limits for creating posts: 100 requests per 15 minutes for each user and 10,000 per 24 hours for each app. Media uploads have their own.
Rate limits and billing are separate. The API has no subscriptions: an app buys credits, and X’s pricing page lists $0.015 for a post and $0.20 for a post with a link.
Quote posts through the API require an Enterprise plan and are not available on pay-per-use access. Longer posts are the other gap: X’s own pages say a longer post cannot yet be scheduled, and cannot be saved as a draft on the web.
Media limits follow the person posting, not the tool. A video that uploaded without an error can still be refused when it is attached, because duration and size are checked again against that account’s Premium or verified status.
Automated posts are allowed when they go through the API, including posts built from an outside source such as an RSS feed. X does not allow duplicative or substantially similar posts on one account or across accounts you operate, automated posts about trending topics, or automated replies and mentions to people who did not ask for them. An AI reply bot needs X’s written approval first, and scripting the website instead of using the API can end in permanent suspension.
An app may act for you only after it has described its automated actions and you have given express consent. X holds the account owner responsible for what a connected app does, and access can be revoked at any time under Apps and sessions.
X’s help centre describes a thread as a series of connected posts from one person. The API has no thread object. The create call publishes one post and has a reply field that names the post it answers, so a thread goes out as a chain: the first post, then each next one as a reply to the post before it.
Every figure is X’s own, as its page stated it that day. The linked page has the last word.
Ask ChatGPT, Claude, OpenClaw or Navo to write and schedule your X (Twitter) posts. See supported agents
Write, preview and schedule X (Twitter) posts yourself from the visual calendar.
Postnavo is launching with thread scheduling for X: you write the whole thread once and each post goes out in order at the scheduled time. X’s create-post call publishes one post at a time, so a thread is sent as a chain of replies.
Once Postnavo launches, you connect ChatGPT, Claude, OpenClaw or any MCP-compatible agent and ask for a post or a thread in plain words. The agent drafts and schedules through Postnavo, which publishes through X’s API, and with approvals on nothing goes out before you have read it.
It does. X’s rate-limit table gives the create-post call 100 requests per 15 minutes for one user and 10,000 per 24 hours for one app, and media uploads are counted apart.
No, within its automation rules. X allows automated posts through its API, including posts built from an RSS feed, and forbids duplicative posts across accounts, automated posts about trending topics and unsolicited automated replies.
X Premium subscribers can write up to 25,000 characters, but X’s help centre says longer posts cannot yet be scheduled. A standard post is 280 characters.
Alt text limits for X, LinkedIn, Instagram, Threads, Bluesky, TikTok and Pinterest, quoted from each network's own pages or code, and where none is published.
How far each network's own scheduler reaches, how many posts can wait and what cannot be scheduled, for ten networks, quoted from their own pages.
Why scheduled social media posts fail to publish: eight checks, cheapest first, with each network's documented token lifetimes, caps and error messages.
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