# Post to Mastodon with Claude or ChatGPT (2026 Setup)

> To post to Mastodon with Claude, connect your Mastodon account on any server to RobinReach, then add RobinReach to Claude as a connector at https://robinreach.com/mcp/v1/messages. Claude can then write posts in a plain, conversational voice, add replies under them, attach photos or a video and schedule them alongside your other networks, all from the chat. It can also read how your posts perform. The same works in ChatGPT and other AI apps, on the Bloom, Thrive and Scale plans.

Canonical: https://robinreach.com/post-to-mastodon-with-claude
MCP server URL: https://robinreach.com/mcp/v1/messages

## Example

User: Post our release notes to Mastodon at noon as a short post, with two replies covering the details.

What Claude did in RobinReach:
- `posts_validate`: Checked the post and both replies against Mastodon's limit
- `posts_create`: Scheduled for 12:00 with two replies

Claude: It goes out at noon. The first post says what changed and why it matters, and the two replies cover the fixes and the link to the full notes. Want the same news on Bluesky?

## What Claude can do on Mastodon

- **Posts.** Posts written for Mastodon, without the hooks and hashtag piles that work elsewhere.
- **Reply chains.** Replies that go up right after your post, for longer updates.
- **Photos and video.** Several photos or a short video per post.
- **Any server.** Works with your account on mastodon.social or any other server.

## Mastodon rules RobinReach checks before saving

| Rule | Value |
| --- | --- |
| Characters | 500, or what your server allows |
| Photos | Up to 4 per post (JPG, PNG, GIF or WebP) |
| Video | MP4 or WebM up to 40 MB |
| Comments under the post | Up to 10, written with the post and published after it |
| Posts a day | Up to 30 per account |
| Delete after publishing | Yes, from the chat |
| Analytics in the chat | Reach and engagement per post, top posts and weekly comparisons |
| Comments inbox | Not available |

## Things to ask

- Post the same update to Mastodon, Bluesky and Threads, each in its own style.
- Write a weekly Monday post about what we shipped, from our changelog.
- Which Mastodon posts got the most boosts this month?
- Schedule a reply chain of three posts explaining our privacy changes.

## Setup

1. **Connect Mastodon to RobinReach.** Create a free RobinReach account and connect Mastodon from the dashboard.
2. **Add RobinReach to your AI app.** In Claude or ChatGPT, add a connector with the URL https://robinreach.com/mcp/v1/messages and sign in to RobinReach. Coding tools and agents use the same URL with an API key.
3. **Ask in plain words.** Post the same update to Mastodon, Bluesky and Threads, each in its own style.

Step by step guides: [Claude](https://robinreach.com/ai/integrations/claude.md), [ChatGPT](https://robinreach.com/ai/integrations/chatgpt.md), [Claude Code](https://robinreach.com/ai/integrations/claude-code.md), [Codex](https://robinreach.com/ai/integrations/codex.md), [Gemini CLI](https://robinreach.com/ai/integrations/gemini-cli.md), [Cursor](https://robinreach.com/ai/integrations/cursor.md), [VS Code](https://robinreach.com/ai/integrations/vs-code.md), [Devin Desktop](https://robinreach.com/ai/integrations/devin-desktop.md), [OpenClaw](https://robinreach.com/ai/integrations/openclaw.md), [Hermes](https://robinreach.com/ai/integrations/hermes.md), [n8n](https://robinreach.com/ai/integrations/n8n.md), [Zapier](https://robinreach.com/ai/integrations/zapier.md), [Make](https://robinreach.com/ai/integrations/make.md)

## Other networks

[Instagram](https://robinreach.com/post-to-instagram-with-claude.md), [Facebook](https://robinreach.com/post-to-facebook-with-claude.md), [LinkedIn](https://robinreach.com/post-to-linkedin-with-claude.md), [TikTok](https://robinreach.com/post-to-tiktok-with-claude.md), [YouTube](https://robinreach.com/post-to-youtube-with-claude.md), [X (Twitter)](https://robinreach.com/post-to-twitter-with-claude.md), [Threads](https://robinreach.com/post-to-threads-with-claude.md), [Pinterest](https://robinreach.com/post-to-pinterest-with-claude.md), [Bluesky](https://robinreach.com/post-to-bluesky-with-claude.md), [Google Business Profile](https://robinreach.com/post-to-google-business-with-claude.md), [Telegram](https://robinreach.com/post-to-telegram-with-claude.md), [WordPress](https://robinreach.com/post-to-wordpress-with-claude.md)

## Questions

### How do I post to Mastodon with Claude?

Connect your Mastodon account to RobinReach, add RobinReach to Claude as a custom connector with the URL https://robinreach.com/mcp/v1/messages and sign in. Then ask Claude to post or schedule in plain words.

### Does it work on my Mastodon server?

Yes. RobinReach connects to accounts on mastodon.social and other servers. Some servers allow longer posts, but RobinReach checks against the standard Mastodon limit so a post fits anywhere.

### Can Claude post reply chains?

Yes. Claude writes the post and its replies, and RobinReach publishes them in order.

### Can I post the same thing to Bluesky and Threads?

Yes. Ask once and Claude writes a version for each network.

### Can ChatGPT post to Mastodon too?

Yes. Add RobinReach to ChatGPT as a custom MCP server and it gets the same tools.

## Sources

Last checked on 24 October 2026. RobinReach's numbers (tools, networks, limits, plans) are read from the product when the page is generated.

- [Mastodon docs, statuses API](https://docs.joinmastodon.org/methods/statuses/)
- [RobinReach MCP server reference](https://robinreach.com/mcp)

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