What the Model Context Protocol changes about social publishing — and how to run it without breaking anything. Setup guides for Claude, ChatGPT and Cursor, the architecture behind agent-driven posting to LinkedIn, X, Instagram, Facebook, Threads, Bluesky and YouTube Shorts, and honest notes on where it fails.
What the Model Context Protocol is, and what it changes for publishing.
Schedulers give people a calendar. APIs give programs an endpoint. An MCP server gives an AI assistant a set of typed tools it can decide to call — and that third thing is what changes how social publishing gets done.
There are dozens of social MCP servers on npm and most of them wrap a single post-a-tweet call. Here is the checklist that separates a weekend demo from something you can leave running unattended.
Wiring a specific client to a specific network, step by step.
Five lines of JSON, one API key, and Claude can draft, preflight and schedule LinkedIn posts without you opening a browser tab. Here is the exact setup — plus the four things that trip up the first attempt.
ChatGPT can publish to seven networks two different ways, and the choice is not about capability — it is about who you are building for and who holds the key.
X is the network where AI-written copy fails most visibly: everything is thirty characters too long and reads like a summary. What to do about it, mechanically.
Running a real posting workflow with an AI agent in the loop.
The failure mode of AI social automation is not bad posts. It is a feed that never stops and never says anything. Here is the split between what an agent should own and what it should never touch.
The model never holds your credentials — that part is genuinely solved. The risks that remain are approval fatigue, prompt injection and key sprawl, and none of them are fixed by architecture alone.
Building on the protocol: architecture, transports, failure modes.
Both can publish the same post to the same network. The difference is who decides what to send — your code, or a model reading a tool schema. That single distinction determines everything else.
The MCP part takes an afternoon. Everything that makes it survive contact with seven social platforms takes considerably longer. Notes from building one, including the mistakes.
Sixteen publishing tools across seven networks, MIT licensed on npm. The free plan covers 20 posts a month and never expires.
npx -y @postmcpai/server