MCPVault

upload_image

MCP tool from Substack MCP by conorbronsdon

Upload an image to Substack's CDN — returns a publicly-fetchable (unlisted) URL

How to use it

upload_image is exposed by the Substack MCP MCP server. Add the server to your MCP client (Claude Desktop, Cursor, Windsurf and others), and the upload_image tool becomes available to the model automatically. See the full listing for setup details and every tool this server provides.

Install Substack MCP

$npx --package @conorbronsdon/substack-mcp substack-mcp-login https://yourblog.substack.com
FULL SUBSTACK MCP LISTING

Other tools in Substack MCP (13)

create_draft

Create a new draft from markdown (private)

create_note

Publish a Substack Note (short-form, publishes immediately)

create_note_with_link

Publish a Note with a link card attachment (publishes immediately)

get_draft

Get full content of a draft by ID

get_post

Get full content of a published post by ID

get_post_analytics

Get a published post's stats (views, opens, signups, subscribes, reactions) by ID

get_post_comments

Get comments on a published post

get_sections

List your publication's sections (categories) with their IDs

get_subscriber_count

Get your publication's current subscriber count

list_drafts

List draft posts

list_published_posts

List published posts with pagination

list_scheduled_posts

List posts scheduled for future publication (read-only; scheduling stays in Substack's editor)

update_draft

Update an existing draft (unpublished only; private)