Postemi

Write, preview and schedule social media posts to 37 platforms and apps, from Instagram to Bluesky.

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Hosted MCP Server

npx add-mcp 'https://mcp.postemi.com/mcp'

Installs into Claude Code, Codex, Cursor and more

Documentation

MCP server for AI agents

What it is for, which URL your client connects to, which key it needs, and what your agent can see.

What is MCP?

MCP is a standard that lets an AI assistant use external tools. On our MCP server, you can see the same channels and schedule posts in the same calendar as in the app.

We don't generate text or images: your model writes the post, and we schedule it. The AI generation page explains this in more detail.

The address

Address

https://mcp.postemi.com/mcp

With OAuth

No header. The client completes the OAuth flow without storing a key.

With a key

The key goes in the Authorization header with the Bearer prefix.

Transport

Streamable HTTP

Manifest

https://postemi.com/.well-known/mcp.json

A 401 is the start of the flow, not an error

Without credentials, we return a 401 and use the WWW-Authenticate header to tell you where to request authorization. This is the first step in the standard MCP flow. You can still read the tool list from the manifest.

Which key you need

  • For chat clients: an MCP key from the Automations → Developers page that starts with psty_mcp_….
  • For apps: an OAuth access token starting with pos_…. It expires, can be refreshed, and is valid only for the resource it was issued for.

The MCP server rejects REST keys

We deliberately reject REST keys that start with psty_ but do not have the MCP prefix, and explain why. This is the most common reason a client cannot connect.

The Developer settings page explains how to create a key. MCP is available on the same plans as the API.

What your agent sees

Ten tools, three of which write. The agent can view your calendar, list your channels, and create a preview, a draft, or a scheduled post.

See the Tool reference for the full list.

What it can't do

  • Connect a channel. The platform requires a person to give consent.
  • Delete a published post. The delete tool only works on unpublished posts and rejects anything already live.
  • Do more than its key allows. If you only want it to create drafts, give it permission to do just that. See the Authentication page.