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How to connect ChatGPT to Tesselith

Add Tesselith to ChatGPT as a custom MCP server and draft, queue and schedule social posts by chatting. ChatGPT talks to Tesselith’s MCP server, so it can draft, queue and schedule posts on every channel you’ve connected. Keep a human in the loop: publishing now and deleting always ask for your confirmation.

Join the waitlistMCP docs

What do I need before connecting?

You need a ChatGPT plan that allows custom MCP servers and a Tesselith workspace on Pro, Team or Agency (every new workspace starts with a 14-day Pro trial) with at least one channel connected. OpenAI's plan rules have changed several times; full read-and-write access is documented for Business, Enterprise and Edu workspaces, where an admin may need to allow custom apps first. ChatGPT signs in with OAuth only, so there's no API key to paste.

1 · Connect · a few minutes

Run this

Plugins → + → Add custom MCP server
Name:            Tesselith
Connection:      Public endpoint
URL:             https://api.tesselith.com/mcp
Authentication:  OAuth

On some accounts the same screen is under Settings → Apps & Connectors → Advanced settings → Developer mode → Create.

2 · Ask · live in Tesselith

Ask ChatGPT to post for you

@Tesselith schedule this caption for Instagram on Friday at 6pm.

Used Tesselith · create_draft · schedule_post

Scheduled for Friday at 6:00 pm in your workspace's time zone. Here's the link if you want to add an image before then.

Also try:

  • “@Tesselith what's in my queue for the next seven days?”
  • “@Tesselith draft a Bluesky thread from this article.”
  • “@Tesselith which of my channels needs attention?”

The setup at a glance

  1. Open Plugins and add a custom MCP server
  2. Enter the Tesselith server
  3. Create it and sign in
  4. Use it in a new chat

One connection, every channel

Connect your accounts in Tesselith once. From then on ChatGPT can plan and schedule for any of them, and Tesselith publishes at the time you set, even after the conversation ends.

  • XSoon
  • Instagram
  • Facebook
  • LinkedInSoon
  • Threads
  • YouTube
  • TikTokSoon
  • DiscordSoon
  • Telegram
  • RedditSoon
  • PinterestSoon
  • Bluesky
  • Mastodon
  • Dev.toSoon
  • HashnodeSoon

How do I connect ChatGPT to Tesselith, step by step?

  1. 1. Open Plugins and add a custom MCP server

    In ChatGPT, open Plugins (chatgpt.com/plugins), click + and choose Add custom MCP server. If you don't see it, your account may still use the older flow under Settings → Apps & Connectors with Developer mode, or your workspace admin hasn't enabled custom apps.

  2. 2. Enter the Tesselith server

    Name it Tesselith, choose a public endpoint, paste the URL and set Authentication to OAuth. Review OpenAI's warning about custom servers and confirm.

    Server URL
    https://api.tesselith.com/mcp

  3. 3. Create it and sign in

    Click Create, review the tools ChatGPT discovered, and sign in when asked. A Tesselith window opens. Sign in, pick the workspace, untick anything you don't want the agent to do, and click Allow access.

  4. 4. Use it in a new chat

    Start a new conversation, type @ and pick Tesselith (or enable it from the + menu on older accounts). ChatGPT asks before running write actions such as scheduling.

What can ChatGPT do in Tesselith?

The server at https://api.tesselith.com/mcp exposes these tools. ChatGPT only gets the permissions you approve, and never more than your own role.

Tesselith MCP tools available to ChatGPT
What it does
list_channelsLists your connected accounts and their status
list_posts / get_postFinds posts by status or channel, or reads one
get_queueShows a channel's upcoming posts and free slots
suggest_best_timeSuggests the next free slot and your best hours
get_analytics_summaryCounts active channels, drafts and published posts
create_draftDrafts a post for one or more channels
update_postChanges a post's text, channels or media
add_to_queueGives a post the channel's next free slot
schedule_postPins a post to an exact time
upload_media_from_urlAttaches an image or video from a public URL
publish_nowPublishes within a minute, only after you confirm
delete_postDeletes a post, only after you confirm

Why is ChatGPT not working with Tesselith?

Almost every failure is one of these. Tesselith returns a readable error, so asking ChatGPT“what went wrong?” usually points at the right row.

Troubleshooting ChatGPT with Tesselith
Fix
No option to add a custom MCP serverYour plan or workspace doesn't allow custom apps yet. On Business, Enterprise and Edu, ask an admin to enable them.
Tools are read-onlySome plans limit custom servers to read and search. In workspaces, the admin also chooses which write actions are enabled.
New tools don't appearOpen the server on the Plugins page, click Refresh, then start a new conversation.
You want to use an API keyChatGPT's custom servers support OAuth, not API keys. Use the sign-in flow; API keys work in Codex and the OpenAI API.
403: your plan doesn't include API accessMCP is included on Pro, Team and Agency. New workspaces get a 14-day Pro trial; upgrade under Settings → Billing.
401: connection revoked or lost accessSomeone disconnected the assistant in Settings → AI assistants, or your role changed. Connect again and approve the workspace.
The assistant can read posts but can't scheduleYou unticked Schedule and queue on the consent screen. Disconnect and connect again, keeping that permission.
No channels foundThe assistant only sees accounts already connected in Tesselith. Connect them under Channels first.
Post scheduled at the wrong timeTell the assistant your time zone. Tesselith takes ISO 8601 times with an offset, and your workspace time zone is shown in get_queue.
429: rate limitedEach connection can make 120 requests a minute on Pro, 300 on Team and 600 on Agency. Wait for the Retry-After seconds.

ChatGPT and Tesselith: frequently asked questions

Which ChatGPT plans can connect Tesselith?
Custom MCP servers need a paid plan. OpenAI documents full read-and-write access for Business, Enterprise and Edu; check your account's Plugins page for what yours allows.
Does ChatGPT need my social media passwords?
No. ChatGPT acts through Tesselith with the permissions you approve. It never sees your network passwords or tokens.
Can ChatGPT's deep research or agent mode use Tesselith?
Deep research uses custom servers for reading only, and OpenAI says agent mode doesn't use them, so schedule from a normal chat.
How do I disconnect ChatGPT?
Remove the server from your Plugins page, and disconnect it in Tesselith under Settings → AI assistants to revoke access at once.

ChatGPT’s own documentation: OpenAI docs.

Connect other AI agents

ClaudeClaude CodeClaude CoworkCodexOpenAI APICursorVS Code (GitHub Copilot)WindsurfZedClineGemini CLIHermes AgentOpenClawGoosen8nMistral Le ChatPerplexityManus

Ready to connect ChatGPT?

Create your Tesselith account, connect your channels, and ChatGPT can start scheduling in minutes.

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