CCClaude Cowork+#Slack

Post to Slack from Claude Cowork

Claude Cowork can post to a channel on Slack through ClipSpeed. Add the ClipSpeed connector, sign in, and then ask Claude Cowork to post to a channel, pick the time, and apply Slack's settings, without leaving Claude Desktop's Cowork mode. Slack is on the roadmap on ClipSpeed's rail; this page describes how it works and says so.

On the roadmapStandard MCP route · not yet verified by us

Start for $1 Setup guide

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.

Claude Cowork

Post the release summary to #general Monday 9am. Preview first.

Preview — nothing booked yet. Would schedule on: • Slack — text · channel Times are in America/New_York. Book it?

via ClipSpeed · Slack

Also try

How to post Slack 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 Slack in ClipSpeed, then describe the post. Setup takes about a minute.

setup once, then just ask

# One-time setup: Claude Desktop → Settings → Connectors
https://api.clipspeed.ai/mcp

# Then ask Claude Cowork:
> Post the release summary to #general Monday 9am
Claude Cowork: Preview — nothing booked yet. Slack — text. 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 Slack in the ClipSpeed app, or ask Claude Cowork for a connect link: it is private, valid for ten minutes, and Slack signs you in itself.

Developer reference: the Claude Cowork MCP page.

What can Claude Cowork do on Slack?

On Slack, Claude Cowork can post messages, images and video to a Slack channel. Every booking runs through the same rules as the ClipSpeed app.

Text, Image and Video posts

Slack takes text, image and video through ClipSpeed. Video: MP4 up to 1 GB. Image: JPG, PNG or GIF.

4,000 characters, checked at booking

Slack's own arithmetic. 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 Slack 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 Slack. No download, no re-upload.

Pacing and numbers

Planned: Text posts on Slack are at least 15 minutes apart, up to 20 a day. Video on Slack is at least 1 hours apart, up to 10 a day under your plan. After a post goes out, Claude Cowork can read back views and engagement where Slack provides them.

How does Claude Cowork post to Slack 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 Slack channel

Ask Claude Cowork whether Slack is connected. It calls list_channels and reads platform_settings, so it also knows what Slack accepts and the limits before you write a word.

Is my Slack account connected to ClipSpeed?

Slack is on the roadmap on ClipSpeed; I can't book there yet. Your YouTube channel is connected if you'd like to use that.

Compose within the rules

Describe the post. Claude Cowork drafts within Slack's limits; mention a clip or a file and it attaches it.

Draft a Slack post about the launch with the best clip from the demo.

Here's the draft (3200/4,000): "…" Clip 2 (score 88) attached. Want me to schedule 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.

Yes — tomorrow at 9am.

Scheduled on: • Slack — Tue, 9:00 AM · id 7c2… Times are in America/New_York.

Slack settings reference

These are the schedule_post fields that apply to Slack. Mention any of them in plain language and Claude Cowork sets them; the server checks them at booking. Fields marked planned land with the Slack release.

Field	Type	Required	What it does on Slack
`platforms`	string[]	Yes	Include `"slack"`. Up to ten platforms per call; each books its own slot.
`text`	string	Yes for a text post	Keep a message under 4,000 characters; Slack truncates longer ones in the client.
`channel`	string	Planned	The channel inside the connected workspace.
`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 Slack configurations

Ask Claude Cowork for any of these and it applies the matching settings.

Release announcement

Post the release summary to #general Monday 9am

Got it. Applying: text · channel

Clip for the team

Share clip 3 in #marketing with a note

Got it. Applying: clip_id

Image

Post the dashboard screenshot to #metrics at 8am

Got it. Applying: media_url

Standing reminder, previewed

Plan a Thursday 3pm content-review reminder for the quarter, show me first

Got it. Applying: preview: true

Example prompts for Slack in Claude Cowork

Type these into Claude Desktop's Cowork mode. Claude Cowork calls ClipSpeed and confirms before publishing.

Just ask

Post Slack with a scheduled time

Post the release summary to #general Monday 9am. Keep the text under 4,000 characters. Preview first.

Clips first

Cut the clips, then post the best

Clip this link, keep the top three by viral score, and schedule them to Slack at 11am, 3pm and 7pm tomorrow. Show me the plan before booking.

Manage

Check and adjust the Slack calendar

What is scheduled on Slack this week? Cancel tomorrow's post and tell me the next open Slack slot on Friday.

Slack limits and gotchas to know

Slack enforces a few rules that Claude Cowork and ClipSpeed respect automatically, but knowing them helps you phrase requests.

Keep messages under 4,000 characters; Slack truncates longer ones.
The connected app can only post to channels it has been added to.
Slack is on ClipSpeed's roadmap, not the next rail. Bookings are refused plainly until it posts.
Slack is internal: the audience is your team, so pacing is generous.
Direct messages are not a scheduling target; channels are.

Rule	Slack
Accepts	Text, Image, Video
Text limit	4,000 characters (Slack truncates a single message near 4,000 characters in the client)
Title	No title field
Links in the caption	Kept with an unfurl
Pacing	Planned: Text posts on Slack are at least 15 minutes apart, up to 20 a day. Video on Slack is at least 1 hours apart, up to 10 a day under your plan.
Formats	Image: JPG, PNG or GIF. Video: MP4 up to 1 GB. 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 Slack. 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_post takes 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 Slack. 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: true for 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.

Claude Desktop → Settings → Connectors

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.

tool list (abridged)

# 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

# Slack: text/image/video · text 4,000

Post to Slack and other platforms from Claude Cowork

One request can book the same content to Slack and other channels, each keeping its own settings and its own slot. Every platform below has its own Claude Cowork guide.

Post the launch to Slack and Discord tomorrow at 9am, then a daily tip on Discord every weekday at 10am. Preview first.

Preview — nothing booked yet: • Slack — Tue 9:00 AM (refused: on the roadmap) • Discord — Tue 9:00 AM (refused: on the roadmap) • Discord daily tips — Mon–Fri 10:00 AM Book it?

Post to Discord from Claude Cowork →Post to Telegram from Claude Cowork →Post to LinkedIn from Claude Cowork →Post to X (Twitter) from Claude Cowork →Upload to YouTube from Claude Cowork →Every platform for Claude Cowork →Slack scheduler features →

Also works with

CLPost to Slack from Claude →CHPost to Slack from ChatGPT →CCPost to Slack from Claude Code →CDPost to Slack from Claude Desktop →

Slack and Claude Cowork: frequently asked questions

How do I post to Slack 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 Slack 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 Slack rules, drafts within them, shows the plan and books on your yes. Slack is on the roadmap; until the badge changes, the booking is refused with a plain message.

What can Claude Cowork post to Slack through ClipSpeed?

Post messages, images and video to a Slack channel. Slack takes text, image and video posts. Text is limited to 4,000 characters.

Which Slack settings can Claude Cowork control?

The fields in the settings reference above: text, channel, 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 Slack API key or developer account?

No. You connect Slack to ClipSpeed once through Slack's own sign-in, and Claude Cowork talks to ClipSpeed over OAuth. No Slack developer key, bearer token or password is pasted anywhere.

How many Slack posts a day can Claude Cowork schedule?

Planned: Text posts on Slack are at least 15 minutes apart, up to 20 a day. Video on Slack is at least 1 hours apart, up to 10 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 Slack 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 Slack 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.