Post to Mastodon from Claude Cowork
Claude Cowork can post to Mastodon on Mastodon through ClipSpeed. Add the ClipSpeed connector, sign in, and then ask Claude Cowork to post to Mastodon, pick the time, and apply Mastodon's settings, without leaving Claude Desktop's Cowork mode. Mastodon is on the roadmap on ClipSpeed's rail; this page describes how it works and says so.
Keep a human in the loop: Claude Cowork shows the plan and asks before anything is public. Posting today: YouTube, TikTok, Instagram, X (Twitter) and LinkedIn.
Also try
How to post Mastodon from Claude Cowork
Cowork uses the connectors on your Claude account. Add ClipSpeed once as a custom connector and enable it for the Cowork session. Connect Mastodon in ClipSpeed, then describe the post. Setup takes about a minute.
# One-time setup: Claude Desktop → Settings → Connectors
https://api.clipspeed.ai/mcp
# Then ask Claude Cowork:
> Post the announcement to Mastodon at 9am
Claude Cowork: Preview — nothing booked yet. Mastodon — text under 500. Book it?ClipSpeed has not yet run an end-to-end check inside Cowork specifically. The connector is standard MCP over HTTP with OAuth, which is what Cowork expects; this page is marked accordingly.
- In Claude Desktop, open Settings → Connectors → Add custom connector and paste https://api.clipspeed.ai/mcp.
- Connect and approve the ClipSpeed sign-in.
- Start a Cowork session, give it access to the folder with your recordings or drafts, and enable the ClipSpeed connector.
- Connect Mastodon in the ClipSpeed app, or ask Claude Cowork for a connect link: it is private, valid for ten minutes, and Mastodon signs you in itself.
Developer reference: the Claude Cowork MCP page.
What can Claude Cowork do on Mastodon?
On Mastodon, Claude Cowork can post 500-character text, images and video to a Mastodon account on any server. Every booking runs through the same rules as the ClipSpeed app.
Text, Image and Video posts
Mastodon takes text, image and video through ClipSpeed. Video: MP4 or WebM. Image: JPG, PNG or GIF; up to four per post on Mastodon.
500 characters, checked at booking
Mastodon's own arithmetic, with every link counted as 23. Too long is refused with the real count, never trimmed at send time.
Exact time or refused
Name the minute and Claude Cowork books it, or you are told why not and offered the next open slot. A booked Mastodon post is never moved behind your back.
Preview before anything posts
preview: true runs the whole booking and writes nothing. Claude Cowork shows the plan, with each slot and the day's remaining cap, and books only on your yes.
Clips cut in the same chat
Submit a video or stream link, get captioned 9:16 clips with a viral score, and post the best as native video on Mastodon. No download, no re-upload.
Pacing and numbers
Planned: Text posts on Mastodon are at least 30 minutes apart, up to 10 a day. Video on Mastodon is at least 4 hours apart, up to 4 a day under your plan. After a post goes out, Claude Cowork can read back views and engagement where Mastodon provides them.
How does Claude Cowork post to Mastodon through ClipSpeed?
You describe what you want in plain language and Claude Cowork makes the ClipSpeed calls. A typical conversation has three beats.
Find your Mastodon channel
Ask Claude Cowork whether Mastodon is connected. It calls list_channels and reads platform_settings, so it also knows what Mastodon accepts and the limits before you write a word.
Compose within the rules
Describe the post. Claude Cowork drafts within Mastodon's limits, counting links as 23; mention a clip or a file and it attaches it.
Schedule or publish
Name a time, or say now. The slot is booked exactly or refused with the next open one, and the reply carries the id you can cancel or edit by.
Mastodon settings reference
These are the schedule_post fields that apply to Mastodon. Mention any of them in plain language and Claude Cowork sets them; the server checks them at booking. Fields marked planned land with the Mastodon release.
| Field | Type | Required | What it does on Mastodon |
|---|---|---|---|
platforms | string[] | Yes | Include "mastodon". Up to ten platforms per call; each books its own slot. |
text | string | Yes for a text post | Up to 500 characters on a default server; links count as 23. |
visibility | public | unlisted | followers | Planned | Mastodon's post visibility. |
media_kind | text | image | video | No | Detected from the file when omitted. |
clip_id or media_url | string | No | A clip or a public link. |
scheduled_at | ISO 8601 | No | Exact or refused with the next open slot. |
preview | boolean | No | Plan only. |
Common Mastodon configurations
Ask Claude Cowork for any of these and it applies the matching settings.
Public post
Unlisted test
Clip as video
Day of posts, previewed
Example prompts for Mastodon in Claude Cowork
Type these into Claude Desktop's Cowork mode. Claude Cowork calls ClipSpeed and confirms before publishing.
Post Mastodon with a scheduled time
Post the announcement to Mastodon at 9am. Keep the text under 500 characters with links counted as 23. Preview first.
Cut the clips, then post the best
Clip this link, keep the top three by viral score, and schedule them to Mastodon at 11am, 3pm and 7pm tomorrow. Show me the plan before booking.
Check and adjust the Mastodon calendar
What is scheduled on Mastodon this week? Cancel tomorrow's post and tell me the next open Mastodon slot on Friday.
Mastodon limits and gotchas to know
Mastodon enforces a few rules that Claude Cowork and ClipSpeed respect automatically, but knowing them helps you phrase requests.
- 500 characters is the default limit, with every link counted as 23. Some servers allow more; ClipSpeed will use your server's limit at booking.
- Your account lives on one server; you connect that server, not mastodon.social in general.
- Mastodon is on ClipSpeed's roadmap, not the next rail. Bookings are refused plainly until it posts.
- Content warnings and alt text are planned fields.
- Planned pacing: ten text posts a day 30 minutes apart, video four hours apart.
| Rule | Mastodon |
|---|---|
| Accepts | Text, Image, Video |
| Text limit | 500 characters; every link counts as 23 (500 is the default; your server may allow more) |
| Title | No title field |
| Links in the caption | Kept; every link counts as 23 characters |
| Pacing | Planned: Text posts on Mastodon are at least 30 minutes apart, up to 10 a day. Video on Mastodon is at least 4 hours apart, up to 4 a day under your plan. |
| Formats | Image: JPG, PNG or GIF; up to four per post on Mastodon. Video: MP4 or WebM. Aspect: any |
| Status | On the roadmap; described here, not yet bookable |
What Postiz-style schedulers cannot do
Cut the clips first
Claude Cowork does not need finished video to start. Hand it a YouTube link, a podcast, a stream VOD or a local export. ClipSpeed finds the moments, cuts them to 9:16 with word-by-word captions, scores each one 0 to 100 for shareability, and returns them in the same conversation. Claude Cowork picks by score, writes the caption from the transcript, and books the clips on Mastodon. Three tool calls, one approval, no download and no re-upload.
- Clips arrive with a title written from the hook, a transcript and a viral score, so the agent can choose and caption without watching the footage.
- Live streams can be clipped while they are still on air; the agent books the highlights for the next morning before the stream ends.
- Every clip is already hosted, so
schedule_posttakes its id directly. Nothing moves through your laptop.
submit_to_clipspeedPaste the link. ClipSpeed starts the job and returns a project id.check_clipsPoll with the project id. Back come the finished 9:16 clips with titles, transcripts, viral scores and preview links.schedule_postPass the clip id, the platforms, a caption and a time. Claude Cowork shows the plan with preview: true, you say yes, it books.generate_image or generate_videoDescribe the shot. ClipSpeed runs it on the model that fits (Seedance, Kling, Veo, Nano Banana Pro, GPT Image and others) and quotes the credits first.wait_for_generationReturns the hosted result link and a preview the agent can show you.schedule_post with media_urlThe result link goes straight into the booking on Mastodon. The caption, the time and the file are approved together.The other half nobody else has
Generate the image or video, then post it
A product shot for Instagram, a 16:9 announcement graphic for X, a six-second opener before a clip: Claude Cowork can make an image or a short video with ClipSpeed's image and video models and book the result in the same reply. There is no separate design tool, no export, no upload page. The generated file is hosted, so media_url is the only thing the booking needs.
- The price in credits is quoted before anything renders, within the per-generation and daily caps you set in Settings.
- Results are previewed in the conversation, so you approve the picture and the post at once.
- Images post as JPG, PNG or WebP up to 25 MB; video posts as MP4, MOV or WebM up to 1 GB.
What is Claude Cowork?
Claude Cowork is the agent mode in Claude Desktop for knowledge work: it operates on folders, files and desktop apps with less supervision than a chat, and uses the same connectors as claude.ai. With the ClipSpeed connector enabled, Cowork can take a folder of recordings, clip them, write the posts and book them.
How ClipSpeed works with Claude Cowork
- Cowork uses the account's connectors; ClipSpeed's tools are available when enabled
- It reads platform rules before composing
- Exact-or-refused booking with the next open slot named
preview: truefor the plan before booking- OAuth sign-in, no passwords in the session
Claude Cowork vs Claude Code vs Claude: Claude Cowork (claude desktop), Claude Code (terminal), Claude (chat). This page is about Claude Cowork; the Claude Cowork guide compares them.
Connector type: Custom (MCP)
Name: ClipSpeed
URL: https://api.clipspeed.ai/mcp
Auth: OAuth
# Enable the connector in the Cowork session and grant the folder.# What the agent reads at connect time (tool descriptions, abridged)
list_channels Connected platforms, what each accepts, limits, your time zone
connect_channel A private 10-minute link to connect one platform
platform_settings Limits, title rules, link handling, pacing per platform
schedule_post clip_id | text | media_url → platforms[], scheduled_at, preview
list_scheduled_posts Scheduled, sending, posted, failed — with post links
update_scheduled_post Edit copy while still scheduled (the time never moves)
cancel_scheduled_post Cancel; undoable 72 h in the app
post_analytics Views, likes, comments, shares where the platform gives them
submit_to_clipspeed Start clipping a video or stream link → projectId
check_clips Finished 9:16 clips with titles, transcripts, viral scores
generate_image / generate_video / wait_for_generation
# Mastodon: text/image/video · text 500 (links = 23)Post to Mastodon and other platforms from Claude Cowork
One request can book the same content to Mastodon and other channels, each keeping its own settings and its own slot. Every platform below has its own Claude Cowork guide.
Also works with
Mastodon and Claude Cowork: frequently asked questions
How do I post to Mastodon from Claude Cowork?
In Claude Desktop, open Settings → Connectors → Add custom connector and paste https://api.clipspeed.ai/mcp. Connect and approve the ClipSpeed sign-in. Connect Mastodon in ClipSpeed (or ask Claude Cowork for a connect link; it is private and valid for ten minutes), then describe the post in plain language. Claude Cowork reads the Mastodon rules, drafts within them, shows the plan and books on your yes. Mastodon is on the roadmap; until the badge changes, the booking is refused with a plain message.
What can Claude Cowork post to Mastodon through ClipSpeed?
Post 500-character text, images and video to a Mastodon account on any server. Mastodon takes text, image and video posts. Text is limited to 500 characters, with every link counted as 23.
Which Mastodon settings can Claude Cowork control?
The fields in the settings reference above: text, visibility, media_kind, clip_id or media_url, scheduled_at, preview. Mention any of them in plain language ("unlisted", "tomorrow at 9", "preview first") and Claude Cowork sets the matching field before it books.
Do I need a Mastodon API key or developer account?
No. You connect Mastodon to ClipSpeed once through Mastodon's own sign-in, and Claude Cowork talks to ClipSpeed over OAuth. No Mastodon developer key, bearer token or password is pasted anywhere.
How many Mastodon posts a day can Claude Cowork schedule?
Planned: Text posts on Mastodon are at least 30 minutes apart, up to 10 a day. Video on Mastodon is at least 4 hours apart, up to 4 a day under your plan. When a time is taken, the booking is refused with the next open slot rather than moved. Ask for preview to see a day's plan and the remaining cap before anything is booked.
Can posts go out to Mastodon while I am away?
Yes. Once booked, ClipSpeed publishes at the scheduled minute whether or not Claude Cowork is open. For unattended runs that decide what to post, use a headless agent such as Claude Code or Codex with the same account.
Is posting to Mastodon from Claude Cowork different from Claude Code?
The booking is identical: the same rules, the same calendar, the same refusals. What differs is where you work. Claude Cowork: claude desktop (mac and windows). Claude Code: terminal, repo, headless, ci.