Substack by Cotlet

MCP server · hosted · v1.0.0 · dev.cotlet/substack

Online · tested 2h agoNEW · 3h agoSeen in the registry 2h ago

Posts, Notes, messages, subscribers and stats for your publication.

What it does

Substack by Cotlet is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.

No capability identified yet from its description.

Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence) and are not a test of the tool.

At a glance

Hosted (remote)YES

Local installNO

Live checkOnline · 70 tools

Version1.0.0

PriceNot in the registry

First seen23 Oct 2026

Last checked2h ago

How to connect

As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 2h ago (live check)

Hosted endpoints

https://cotlet.dev/mcp/v1/substack streamable-http
https://cotlet.dev/mcp/v1/substack/connect streamable-http

Required: Authorization (get it from the publisher)

MCP settings (Claude Desktop, Cursor and other MCP clients)

{
  "mcpServers": {
    "substack-by-cotlet": {
      "url": "https://cotlet.dev/mcp/v1/substack",
      "headers": {
        "Authorization": "<your Authorization>"
      }
    }
  }
}

Replace the values in <angle brackets>.

Live check

Electra Index connected to the hosted endpoint 2h ago

ONLINE Substack by Cotlet answered an MCP connection on 23 Oct 2026 and introduced itself as cotlet-substack 0.1.0 (MCP protocol 2025-06-18).

70 tools offered to AI assistants

cotlet_whoami · The Cotlet account this connection acts as: email, workspace, access status, the API key or OAuth client in use with its scope, the apps the workspace may call and its credit balance. Free. Needs the user's Cotlet API key or sign-in.
cotlet_apps · The apps of the user's workspace and whether each works now: access granted or requested, the app account in the user's Cloud Browser (connected, signed out, not enabled for agents), and the one step the user has to take, with the console l
cotlet_request_apps · Requests access to apps for the user's workspace, as Request access in the console: a live app is granted at once, any other goes to the Cotlet team, who answer within 72 hours. Takes app slugs as listed at https://cotlet.dev/api/v1/apps. F
cotlet_balance · The user's current credit balance. Free. Needs the user's Cotlet API key or sign-in.
cotlet_get_call · Status of an earlier Cotlet call, by its call_id: pending (waits for the owner's approval in the Cotlet console), approved, running, success, rejected, expired, blocked or failed. For a call that answered with status pending or running.
cotlet_upload_file · Returns a one-time upload_url and a file_id for a local file (an image for a post, an attachment). The file is sent to upload_url with an HTTP PUT; an argument that takes a file accepts {"file_id": "..."}. Up to 25 MB, the URL works once. F
cotlet_report_issue · Sends a report straight to the Cotlet team: a tool that failed or returned wrong data, an error you could not get past, or a tool, field or app the task needed and Cotlet lacks. The report carries the error text and call_id when there is on
cotlet_browser_connect · Wakes the user's Cloud Browser of one app (a real Chrome on Cotlet, signed in to that app as the user) and returns cdp_url, a Chrome DevTools Protocol WebSocket that gives a CDP client full control of the browser. It works in one open tab,
cotlet_browser_sessions · Open Chrome DevTools connections to the user's Cloud Browsers with the minutes and credits each has cost so far, and the cdp_url links still valid. With close: true it ends the open connections and takes back the unused links, of one app or
cotlet_browser_open · Wakes the user's own browser on Cotlet, a real Chrome hosted for them: their web browser with the sites they signed in to there, or with `app` that app's browser, signed in to the app. Opens `url` when given and returns the page's URL and t
cotlet_browser_navigate · Opens a public http or https address in the user's browser on Cotlet and returns the URL and title it ended on. An app's browser opens only that app's pages. Every started minute of the session costs credits; it ends when closed or 3 minute
cotlet_browser_read · Returns the current page of the user's browser on Cotlet: its readable text, up to 20,000 characters, and a numbered list of its links, buttons and fields. Field values, cookies and storage are never returned. On a page longer than that, bo

Show 58 more

cotlet_browser_screenshot · Returns a JPEG image of the visible part of the current page in the user's browser on Cotlet, with its URL and title: boards, canvases and layouts that the page text does not show. Every started minute of the session costs credits; it ends
cotlet_browser_scroll · Scrolls the current page in the user's browser on Cotlet with the mouse wheel, as a person does: down or up by `screens` viewport heights (default 0.8), to the top or the bottom, or until element `element` is in view. Content that loads on
cotlet_browser_click · Clicks a link, button or other element of the current page in the user's browser on Cotlet, by its number in the page's element list, and returns the URL and title after the click. It acts as the user on that site. Buttons that pay or buy a
cotlet_browser_type · Types text into a field of the current page in the user's browser on Cotlet, by the field's number in the page's element list, and with `submit` presses Enter. Returns the URL and title after it. Password, card and one-time code fields and
cotlet_browser_select · Chooses an option of a drop-down list on the current page in the user's browser on Cotlet, by the list's number in the element list and the option's label as read lists it (or its value). Returns the URL and title after it. Card fields and
cotlet_browser_press · Presses one key on the current page in the user's browser on Cotlet, on the element that has focus: Tab to the next field, Enter to send, Escape to close a dialog or pop-up, arrows to move through a suggestion list. Returns the URL and titl
cotlet_browser_upload · Puts files into a file field of the current page in the user's browser on Cotlet, or into the file picker that an upload button opens, by its number in the element list. A file is given as {"url": "https://..."} for a file online or {"file_
cotlet_browser_close · Ends the session in the user's browser on Cotlet (with `app`, that app's browser): the browser keeps its cookies, goes to sleep and the per-minute charge stops. Returns the session's minutes and credits.
export_subscribers · The full subscriber list as a CSV download link, with the row count.
get_audience_insights · Where your subscribers live, and which publications share your readers.
get_conversation · The latest messages of one direct-message conversation, oldest first.
get_daily_stats · Day by day: total and paid subscribers, followers and views.
get_feed · Your Substack home feed: posts and Notes, For you or Following.
get_post · Full post: title, subtitle, body as Markdown, audience, URL and dates.
get_post_engagement · Who liked and commented on a post, and the subscribers it won and lost.
get_post_stats · Recipients, opens, open rate, views, likes, restacks and subscribers gained.
get_post_traffic · Where a post's readers came from: sources, categories and devices.
get_publication_stats · Total and paid subscribers, new subscribers, paid cancellations and estimated revenue for a period.
get_unread_counts · How many unread direct messages, message requests and activity notifications you have.
list_activity · Your Substack notifications: replies, likes, new followers, restacks, newest first.
list_comments · Comments on a post, with author, text and whether you replied.
list_conversations · Your direct-message conversations, latest first, with the last message.
list_note_replies · Replies under a Note, with author, text and likes.
list_notes · Notes posted by you or any other Substack user, newest first, with likes and replies.
list_post_tags · Tags your publication uses to group posts.
list_posts · Posts of your publication, newest first, with status and audience.
list_recommendations · Publications you recommend, or that recommend you, with the subscribers each sent.
list_sections · Sections of your publication, the separate newsletters inside it.
list_subscriber_tags · Tags you use to group subscribers.
list_subscribers · Subscribers with plan, start date and activity rating.
list_subscriptions · Publications you subscribe to, with your plan and whether their emails reach you.
list_traffic_sources · Where your publication's visitors came from in a period, most views first.
search_substack · Search all of Substack for people, posts and Notes.
add_subscriber · Add one email to your list as a free subscriber. Waits for the owner's approval.
cancel_scheduled_post · Stop a scheduled post from going out; it stays as a draft.
create_draft · New draft from Markdown. Nothing is sent until you publish or schedule it.
create_post_tag · New tag for grouping your posts.
create_subscriber_tag · New private tag for grouping subscribers.
delete_comment · Delete one of your own comments, Notes or Note replies. Waits for the owner's approval.
delete_post · Delete a draft, scheduled or published post, with its comments. Waits for the owner's approval.
duplicate_post · Copy any post into a new draft.
follow_user · Follow or unfollow a Substack user, so their Notes reach your feed.
like_comment · Like or unlike a comment or a Note as you.
like_post · Like or unlike any Substack post as you.
pin_comment · Pin a comment to the top of your post's comments, or unpin it.
publish_note · Short post in Substack Notes, now or at a set time, optionally with a link card to one of your posts. Waits for the owner's approval.
publish_post · Publish a draft now. Waits for the owner's approval.
recommend_publication · Recommend another publication to your readers, or stop recommending it. Waits for the owner's approval.
remove_comment · Remove someone's comment from your post as the publication's moderator. Waits for the owner's approval.
remove_subscriber · Remove one email from your subscriber list. Waits for the owner's approval.
reply_to_comment · Reply as you under a comment on your post. Waits for the owner's approval.
reply_to_note · Reply as you under any Note or Note reply. Waits for the owner's approval.
schedule_post · Publish a draft at a set time, on the web and by email. Waits for the owner's approval.
send_message · Send a direct message on Substack, in a conversation or to a person. Waits for the owner's approval.
tag_post · Add a tag to a post, or take it off.
tag_subscribers · Put a tag on subscribers by email, or take it off.
unpublish_post · Take a published post off the web and back to drafts. Waits for the owner's approval.
update_draft · Change the title, subtitle, body or audience of a draft.

What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method

Is this your server? Monitoring Pro: a check every 30 minutes and an email within the hour when it stops answering. Launch offer: $39.99 once, for life.

Facts & evidence

Each fact shows where it was seen and when.

Fact	Value	Evidence	Source	Last confirmed
Hosted endpoint	https://cotlet.dev/mcp/v1/substack, https://cotlet.dev/mcp/v1/substack/connect	DECLARED	SRC-001 Official MCP Registry	2h ago
Local install (package)	no	DECLARED	SRC-001 Official MCP Registry	2h ago
Remote access (hosted)	yes	DECLARED	SRC-001 Official MCP Registry	2h ago
Website	https://cotlet.dev/integrations/substack-api-mcp-server	DECLARED	SRC-001 Official MCP Registry	2h ago
Repository	https://github.com/cotletdev/substack-api-mcp-server	DECLARED	SRC-001 Official MCP Registry	2h ago
Registry status	active	DECLARED	SRC-001 Official MCP Registry	2h ago
Version	1.0.0	DECLARED	SRC-001 Official MCP Registry	2h ago
MCP server	yes	DECLARED	SRC-001 Official MCP Registry	2h ago

Change history

NEW23 Oct 2026
first seen in the index

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Questions about Substack by Cotlet

How do I connect Substack by Cotlet?

Use the hosted endpoint https://cotlet.dev/mcp/v1/substack in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.

Does Substack by Cotlet need an API key or token?

Yes. The registry entry lists a required value: Authorization. Get it from the publisher.

What tools does Substack by Cotlet offer?

When Electra Index connected on 23 Oct 2026, it listed 70 tools: cotlet_whoami, cotlet_apps, cotlet_request_apps, cotlet_balance, cotlet_get_call, cotlet_upload_file, cotlet_report_issue, cotlet_browser_connect and more. The full list is in "Live check" above.

Is Substack by Cotlet online?

Yes. Its hosted endpoint answered an MCP connection from Electra Index 2h ago.