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How to connect Claude Cowork to Tesselith

Let Claude Cowork plan and schedule your social posts as part of longer tasks, using Tesselith as a custom connector. Claude Cowork 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 Claude with Cowork 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. Cowork uses the same account connectors as claude.ai; servers from a local claude_desktop_config.json aren't available in Cowork.

1 · Connect · a few minutes

Run this

Customize → Connectors → Add custom connector
Name:  Tesselith
URL:   https://api.tesselith.com/mcp

Already added Tesselith on claude.ai? It's already available in Cowork.

2 · Ask · live in Tesselith

Ask Claude Cowork to post for you

Turn the three PDFs in my Downloads folder into a week of LinkedIn and Threads drafts in Tesselith.

Used Tesselith · create_draft ×7

I read all three documents and created seven drafts, one per day from Monday, each tailored for Threads' 500-character limit. They're drafts, so nothing is scheduled. Shall I queue them?

Also try:

  • “Summarise what Tesselith published last week and what's queued next.”
  • “Find gaps in next week's Instagram queue and draft posts to fill them.”
  • “Rewrite my drafts so none of them repeats the same opening line.”

The setup at a glance

  1. Add Tesselith as a custom connector
  2. Connect and approve
  3. Decide what Cowork may do unattended
  4. Give Cowork a task

One connection, every channel

Connect your accounts in Tesselith once. From then on Claude Cowork 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 Claude Cowork to Tesselith, step by step?

  1. 1. Add Tesselith as a custom connector

    In Claude, open Customize → Connectors, click + Add, choose Add custom connector, name it Tesselith and paste the URL. Keep the recommended authentication settings and click Add.

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

  2. 2. Connect and approve

    Click Connect. A Tesselith window opens. Sign in, pick the workspace, untick anything you don't want the agent to do, and click Allow access. For autonomous work, consider unticking delete permissions.

  3. 3. Decide what Cowork may do unattended

    Cowork can run many steps in a row. Keep approval on for publish_now, delete_post and schedule_post, and avoid Allow always for them, so anything public waits for you.

  4. 4. Give Cowork a task

    Describe the outcome, not the clicks: a week of posts from a document, a recap of last week's queue, or drafts for every channel. Review the drafts in Tesselith before they're queued.

What can Claude Cowork do in Tesselith?

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

Tesselith MCP tools available to Claude Cowork
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 Claude Cowork not working with Tesselith?

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

Troubleshooting Claude Cowork with Tesselith
Fix
Tesselith is missing in CoworkIt was added as a local server in claude_desktop_config.json. Add it as a custom connector instead.
Cowork schedules more than you wantedTurn approval back on for the write tools, or reconnect with Schedule and queue unticked so Cowork can only draft.
The connector shows as disconnectedClick Connect again on the connector, or remove and re-add it.
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.

Claude Cowork and Tesselith: frequently asked questions

Is Cowork's connector the same as Claude's?
Yes. Custom connectors belong to your Claude account and work in claude.ai, the desktop app, Cowork and the mobile apps.
Can Cowork publish without asking?
Only if you allow it. Keep approval on for write tools; publish_now and delete_post also require Tesselith's explicit confirmation flag.
What's a good first task for Cowork?
Ask it to turn a long document into a week of drafts across your channels. You review and queue them in Tesselith.

Claude Cowork’s own documentation: Anthropic docs.

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