Postmcp MCP Server vs Substack MCP
A side-by-side look at the Postmcp MCP Server and Substack MCP MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Postmcp MCP Server for social media work as a local process; choose Substack MCP for social media as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Postmcp MCP Server when
- You need dedicated capabilities in the Social Media domain.
- You prefer a local stdio subprocess transport.
- You have the keys it needs:
POSTMCPAI_API_KEY, POSTMCPAI_API_URL, POSTMCPAI_PROJECT_ID, PORT. - You want tools like
get_user_info, list_workspaces, get_connected_accounts.
Choose Substack MCP when
- You need dedicated capabilities in the Social Media domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: other.
- You have the keys it needs:
SUBSTACK_PUBLICATION_URL, SUBSTACK_SESSION_TOKEN, SUBSTACK_USER_ID, SUBSTACK_MCP_HOME. - You want tools like
get_subscriber_count, list_published_posts, list_drafts.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Social Media | Social Media |
| Quality signal | 61/100 · Good | 68/100 · Great |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | other |
| Pricing | Not declared | Free |
| Required env vars | POSTMCPAI_API_KEYPOSTMCPAI_API_URLPOSTMCPAI_PROJECT_IDPORT | SUBSTACK_PUBLICATION_URLSUBSTACK_SESSION_TOKENSUBSTACK_USER_IDSUBSTACK_MCP_HOME |
| Verified owner | Community listing | Community listing |
| GitHub stars | 0 | 44 |
| Directory activity | 2 views 0 installs 0 upvotes | 6 views 0 installs 0 upvotes |
| Tools | 16 | 14 |
| Full listing | View Postmcp MCP Server | View Substack MCP |
Tools & capabilities
Postmcp MCP Server tools 16
get_user_infoRetrieve details of the logged-in user including subscription plan, credit balance, AI token count, the active workspace, and the caller's role in it.list_workspacesList every workspace (project) the user belongs to, with the id to pass as workspaceId, the caller's role, and which one is the default. Call this first whenever the user mentions a client, brand, or workspace by name.get_connected_accountsList every connected social profile in the workspace with the profileId needed to target it. Call this before creating a post so the post reaches the intended profile rather than every account on a platform.get_account_healthReport connections whose access token has expired or is about to, and which therefore need the user to reconnect. Check this before scheduling anything far out - a post scheduled onto a dead connection fails silently at publish time.list_brandingsList the workspace's brand kits: tone of voice, audience, keywords, and reference style images. Use one to keep drafted copy on-brand, and pass its id to generate_image for on-brand visuals.list_postsRetrieve scheduled, published, draft, and failed posts, newest first, with per-profile delivery status. Every profile that received a post carries `url`, the link to the live copy - give the user that link when they ask where a post went. Returns pagination plus counts per status.get_postFetch a single post by id, including per-profile delivery status, the live URL of each published copy, and the error for any profile that failed.preflight_postDry-run a post before creating it: checks copy against each platform's character limit, flags profiles that are not connected or need reconnecting, warns when a platform requires media, reports each target's video limit when a video is attached, and reports the credit cost against the workspace balance. Costs nothing and publishes nothing. Run this before create_post whenever the copy is long, carries a link, or targets several platforms.create_postSchedule or immediately publish a post to specific connected social profiles. Prefer targetAccounts so the post lands only on the profiles you name. Every targeted profile becomes its own post with its own id, so each can be edited, retried or cancelled on its own - the response lists them all. With publishImmediately, each delivered profile comes back with a `url` to the live copy; pass those on to the user.publish_post_nowBroadcast an existing scheduled post immediately to its platforms. Also the way to retry a failed post: profiles that already received it are skipped, so only the stragglers go out. The returned post carries a `url` per delivered profile - report those links rather than only saying it published.delete_postCancel and delete a scheduled or failed post from the database.update_postUpdate the fields (content, target profiles, schedule date/time) of an existing post. To move a post to a different slot without touching anything else, use reschedule_post.- +4 more on the listing page
Substack MCP tools 14
get_subscriber_countGet the current subscriber count for your Substack publication. Returns `precision`: 'exact' when the API reports a true count, 'approximate' when only Substack's rounded value is available (the real number is that or higher — render it hedged, e.g. '1,000+'), or 'unavailable' with count -1. Never treat an approximate value as exact.list_published_postsList published posts with pagination. Returns title, date, slug, and URL for each post.list_draftsList draft posts. Returns title, creation date, and audience for each draft.get_postGet the full content of a published post by ID. Returns title, body HTML, metadata.get_draftGet the full content of a draft post by ID. Returns title, body, metadata.get_post_commentsGet comments on a published post. Returns commenter name, comment body, date, and reaction counts.get_sectionsList your publication's sections (categories). Returns each section's id and name. Use a section id as `section_id` when creating or updating a draft to file it under that section.get_post_analyticsGet performance stats (views, emails sent/delivered/opened, signups, subscribes, estimated value, comments, reactions) for a published post by ID. Substack has no per-post stats endpoint, so this searches your 500 most recent published posts for the ID; returns a not-found note if it isn't among them.list_scheduled_postsList posts scheduled for future publication, soonest first. Read-only visibility into what's queued — scheduling itself is done in Substack's editor (this server does not schedule, publish, or delete long-form posts). Returns id, title, audience, and scheduled time (`trigger_at`).create_draftCreate a new draft post. Accepts markdown body which is converted to Substack's format. Does NOT publish — creates a draft only.update_draftUpdate an existing draft post. Only works on unpublished drafts. Accepts markdown body.upload_imageUpload an image to Substack's CDN. Provide exactly one of `image_base64` (a base64 data URI) or `image_path` (a local file path). Returns a hosted image URL that is publicly fetchable by anyone with the link (an unlisted asset — not attributed to you or added to your feed).- +2 more on the listing page
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Postmcp MCP Server
{
"mcpServers": {
"postmcp-mcp-server": {
"command": "npx",
"args": [
"-y",
"@postmcpai/server"
],
"env": {
"POSTMCPAI_API_KEY": "YOUR_POSTMCPAI_API_KEY_HERE",
"POSTMCPAI_API_URL": "YOUR_POSTMCPAI_API_URL_HERE",
"POSTMCPAI_PROJECT_ID": "YOUR_POSTMCPAI_PROJECT_ID_HERE",
"PORT": "YOUR_PORT_HERE"
}
}
}
}
Substack MCP
{
"mcpServers": {
"conorbronsdon-substack-mcp": {
"command": "npx",
"args": [
"-y",
"@conorbronsdon/substack-mcp"
],
"env": {
"SUBSTACK_PUBLICATION_URL": "YOUR_SUBSTACK_PUBLICATION_URL_HERE",
"SUBSTACK_SESSION_TOKEN": "YOUR_SUBSTACK_SESSION_TOKEN_HERE",
"SUBSTACK_USER_ID": "YOUR_SUBSTACK_USER_ID_HERE",
"SUBSTACK_MCP_HOME": "YOUR_SUBSTACK_MCP_HOME_HERE"
}
}
}
}
Frequently asked questions
Postmcp MCP Server is categorized under Social Media and uses a local stdio subprocess. Substack MCP belongs to Social Media and uses a local stdio subprocess. Pick Postmcp MCP Server for social media work and Substack MCP for social media.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Postmcp MCP Server has no declared pricing — check the project's own site. Substack MCP is listed as free. Auth: other. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add postmcp-mcp-server and conorbronsdon-substack-mcp as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Postmcp MCP Server has a quality signal of 61/100 (Good) with 2 views, 0 installs and 0 GitHub stars. Substack MCP has 68/100 (Great) with 6 views, 0 installs and 44 GitHub stars.