Note: Version and last-published dates below were read from the npm registry on 29 August 2026, which is the authoritative source for a published package. This ecosystem moves fast, so check the registry before connecting anything.
An MCP server gives an AI assistant the ability to publish, schedule and check posts without leaving the conversation. The category is about six months old, which changes what you should compare on.
In a young ecosystem, maintenance is the specification. A server that handles credentials to your social accounts and has not been updated in five months is a different proposition from one shipping every week, whatever the feature lists say. So each entry below leads with its last-published date.
At a glance
| Server | Latest | Last published | Backing |
|---|---|---|---|
@bulkpublish/mcp-server | 1.15.0 | 20 Aug 2026 | BulkPublish |
posterly-mcp-server | 0.35.1 | 17 Aug 2026 | posterly |
postfast-mcp | 0.6.0 | 24 Aug 2026 | PostFast |
postiz-mcp | 0.2.0 | 2 May 2026 | Postiz ecosystem |
late-social-mcp | 0.2.0 | 8 Mar 2026 | Community, Late API |
1. @bulkpublish/mcp-server
- Latest: 1.15.0, published 20 August 2026
- Platforms: 15
- Auth: API key, or OAuth 2.1 with granular scopes
Exposes posts, scheduling, media, channels, labels, analytics, RSS feeds and quota, so an assistant can answer “what is scheduled this week?” as well as create things. Posts can be created as drafts rather than published, which is the setting worth starting on when a model is doing the composing.
Setup guides exist for Claude, ChatGPT, Cursor, VS Code, Windsurf, Codex CLI, Gemini CLI, Cline and Warp.
Rate limits by plan:
| Free | Pro | Business | |
|---|---|---|---|
| API requests/day | 30 | 5,000 | 50,000 |
| Posts | 3/day | 30/day | Unlimited |
| Channels | 3 | 30 | 75 |
The free plan is enough to connect the server and try the whole loop.
2. postfast-mcp
- Latest: 0.6.0, published 24 August 2026, 36 releases since March
- Backing: PostFast, wrapping its own API
The most recently published of the five at time of checking, and a steady release cadence since March. Schedules and manages posts from Claude, Cursor, VS Code and other MCP clients.
Vendor-backed, so the server’s life is tied to the product’s rather than to a maintainer’s spare time.
3. posterly-mcp-server
- Latest: 0.35.1, published 17 August 2026, 56 releases since March
- Platforms: 18, the widest count here
The most releases of any server on this list, and the broadest platform coverage. If your set includes networks the others do not reach, this is the one to check first.
Also distributed for Hermes alongside the npm package.
4. postiz-mcp
- Latest: 0.2.0, published 2 May 2026
- Backing: the Postiz ecosystem, which is open source
Described as a canonical Postiz client for any MCP-compatible client. Worth looking at specifically if you already run Postiz, since self-hosting it costs nothing and the MCP server then talks to your own instance.
Four months without a release at time of checking. For an open-source project attached to an actively developed product that is not alarming, but it is a slower cadence than the top three.
5. late-social-mcp
- Latest: 0.2.0, published 8 March 2026
- Scope: 47 tools across 13 categories, via the Late API
The broadest tool surface described of any here, covering posts, scheduling, analytics, engagement, media and webhooks.
It is also the least recently updated, at nearly six months at time of checking. Treat that as the headline rather than the tool count: a community project holding credentials to your social accounts is one you want to see maintained.
What did not make the list
Metricool advertises an MCP on its pricing page, but it is not published to npm under a name we could verify, so it is presumably hosted rather than installed. Buffer and Postiz cloud have APIs but no first-party MCP server on npm.
There are also several general “social media MCP server” projects on GitHub that wrap platform APIs directly. They are not listed here because none had a published, versioned package we could check, and an unversioned server holding your account credentials is not something to recommend.
How to evaluate one yourself
- Check the registry, not the README.
npm view <package> time.modifiedtells you when it was really last touched. - Ask whether it can create drafts. A server that only publishes immediately gives an assistant the ability to put unreviewed generated text in front of an audience.
- Ask whether it validates before publishing. Character limits and media rules differ per platform; a server that submits and hopes produces failures the assistant never sees.
- Check it can read, not just write. Most of the value in conversational publishing is in the questions, not the posting.
- Connect it with a dedicated credential you can revoke without disturbing anything else.
Then test it by asking for something invalid, such as a post well over a platform’s character limit. How it fails tells you more than how it succeeds.
The short version
@bulkpublish/mcp-server, postfast-mcp and posterly-mcp-server are the
three shipping regularly, and posterly has the widest platform coverage at 18.
postiz-mcp is the one to use if you already self-host Postiz.
late-social-mcp has the largest tool surface and the oldest release, which
in this category is the thing to weigh most carefully.