Threads MCP Server

Your AI agent publishes and schedules Threads posts, images, videos and carousels through the official Threads API.

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No credit card
3 min setup

Updated Nov 5, 2026

Connect in a minute

In Claude, open Customize → Connectors → Add custom connector and paste:
Connector URL
```
https://postonce.to/mcp
```
Choose Register automatically, select Add, then Connect and sign in to PostOnce.
Ask your agent:
Prompt
```
Show my connected PostOnce accounts.
```

Claude guide →

Turn on Developer mode, then create an app in Plugins with this URL:
Server URL
```
https://postonce.to/mcp
```
Choose OAuth with automatic registration and sign in to PostOnce.
Ask your agent:
Prompt
```
Show my connected PostOnce accounts.
```

ChatGPT guide →

Install the plugin. It adds the server and the skills below.

Terminal

claude plugin marketplace add postoncehq/plugins
claude plugin install threads-mcp@postoncehq

Run /mcp, pick the postonce server, choose Authenticate and sign in to PostOnce.
Ask your agent:
Prompt
```
Show my connected PostOnce accounts.
```

Claude Code guide →

Add the server:

Terminal

codex mcp add postonce --url https://postonce.to/mcp

Sign in to PostOnce in the browser that opens:
Terminal
```
codex mcp login postonce
```
Ask your agent:
Prompt
```
Show my connected PostOnce accounts.
```

Codex guide →

Merge into ~/.cursor/mcp.json:

~/.cursor/mcp.json

{
  "mcpServers": {
    "postonce": {
      "url": "https://postonce.to/mcp"
    }
  }
}

In Cursor Settings → MCP, select Connect next to postonce and sign in to PostOnce.
Ask your agent:
Prompt
```
Show my connected PostOnce accounts.
```

Cursor guide →

Add a remote server:

Connection

URL: https://postonce.to/mcp
Transport: Streamable HTTP
Auth: OAuth (sign in with PostOnce)

No OAuth in your client? Send Authorization: Bearer with a key from Preferences → API keys (paid plans only).
Ask your agent:
Prompt
```
Show my connected PostOnce accounts.
```

All integrations →

What your agent can do

Ask your agent toHow it works

Publish a text post now (up to 500 characters)create_post on your connected Threads account

Schedule a post for latercreate_post with publish_at

Post an image or a video (up to 5 minutes)create_upload_url, upload, then create_post with media

Post a carousel (up to 10 images and videos, mixed)Upload each file, then pass them in order as media

Save a draft to finish latercreate_draft

Check whether a post went out, and get its URLget_post

Change or cancel a scheduled postupdate_post, cancel_post

Post the same thing to Threads and other platformsAdd more targets to create_post (Instagram, X, LinkedIn, Bluesky, Facebook, TikTok, YouTube, Pinterest)

Images are JPEG or PNG up to 8 MB; videos are MP4 or MOV up to 1 GB. Text over 500 characters is cut off, so keep each post within the limit.

Not supported: multi-post threads (reply chains), replies, polls, quote posts, topic tags, GIFs, analytics, reading or replying to comments, DMs, and editing or deleting posts that are already live. Each create_post publishes one standalone Threads post.

Threads skills

Your agent writes for the platform before it posts. In the plugin, free on GitHub.

threads-post-writerWrites Threads posts people reply to: conversational, one idea, under 500 characters, with an easy question to answer.
threads-crosspost-adapterRewrites an X, LinkedIn or Instagram post into a Threads-native post instead of pasting the same text everywhere.
threads-bio-generatorWrites 150-character Threads bio options for you to paste into the app.
threads-content-calendarPlans 1 to 4 weeks of Threads posts from your goals or a source you want to repurpose, then schedules them.
postoncePublishing workflow: pick the right account, upload media, schedule, and confirm the post actually went live.

threads-mcp on GitHub

Try these prompts

Rewrite this LinkedIn post for Threads and schedule it for 6pm.
Post these 4 photos to Threads as a carousel with a one-line caption.
Plan a week of Threads posts from our blog and schedule one each evening.

Threads MCP questions

Does Threads have an official MCP server?

This server uses Threads' official API through PostOnce. You connect your profile once with Meta's own login, and your agent publishes through that connection.

Can Claude post to Threads?

Yes, once it's connected to an MCP server that can publish, like this one. Claude writes the post, then calls create_post.

Is it safe for my Threads account?

Yes. Posts go through Threads' official API with the permissions you grant when you connect. Many Threads MCP servers on GitHub drive a logged-in browser session or an unofficial, reverse-engineered API instead, which Meta's terms don't allow and which can get accounts restricted.

Can it post a multi-post thread or reply to posts?

No. Each post is published on its own; reply chains, replies and polls aren't supported. For a longer idea, the skills fit it into one 500-character post, or use a carousel of images to carry the detail.

Do I need a Threads developer app or API approval?

No. PostOnce holds the Threads API access; you just connect your profile.

Is it free?

The skills are free and MIT-licensed on GitHub. Publishing runs through a PostOnce account, which you can try free for 7 days without entering a card. After that, see pricing.

Can I post to Threads from my own code?

Yes. The same publishing works through the PostOnce social media posting API with an API key on any paid plan.

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