Postfast

MCP server for the PostFast API — schedule and manage social media posts via AI tools like Claude, Cursor, VS Code, and more.

Hosted connector (no install)

Prefer not to run anything locally? Connect to the hosted endpoint and authenticate with OAuth — no npx, no API key to manage:

https://mcp.postfa.st/mcp

Add it as a remote/streamable-HTTP MCP server in any client that supports OAuth (e.g. ChatGPT, Claude). You'll be prompted to sign in to PostFast and authorize access on first use.

Want to run the server yourself instead? Use the npx + API-key setup in Quick Start below.

Quick Start

1. Get your API key

Log in to PostFast, go to API in the sidebar, and generate a key.

2. Install

Choose your preferred method:

Claude Desktop (recommended)

Download the extension from the Claude Desktop extension directory or install manually:

1. Add to claude_desktop_config.json:

{
  "mcpServers": {
    "postfast": {
      "command": "npx",
      "args": ["-y", "postfast-mcp"],
      "env": {
        "POSTFAST_API_KEY": "your-api-key-here"
      }
    }
  }
}

2. Restart Claude Desktop.

Claude Code

Via plugin:

If you already added PostFast by hand, remove that entry before installing the plugin, or Claude Code shows two sets of PostFast tools.

/plugin marketplace add peturgeorgievv-factory/postfast-mcp
/plugin install postfast@postfast-mcp

After installing, set your API key — pick one of these:

# Option A: Add to your shell profile (~/.zshrc or ~/.bashrc)
export POSTFAST_API_KEY="your-api-key-here"

# Option B: Add to ~/.claude/settings.json
# { "env": { "POSTFAST_API_KEY": "your-api-key-here" } }

Then restart Claude Code.

Via manual config:

Add to your project's .mcp.json:

{
  "mcpServers": {
    "postfast": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "postfast-mcp"],
      "env": {
        "POSTFAST_API_KEY": "your-api-key-here"
      }
    }
  }
}

Or add it for every project:

claude mcp add --scope user postfast --env POSTFAST_API_KEY=your-api-key-here -- npx -y postfast-mcp

Cursor

This repository is also a Cursor plugin: the PostFast MCP server together with its two skills, for scheduling posts and for the comments inbox.

To install it, open Customize in Cursor, search the marketplace for PostFast, select Install, and paste your API key when Cursor asks for it. Cursor starts the server with that key, so there is nothing else to configure. If PostFast doesn't show up in the marketplace yet, add the server by hand with the config below.

Cursor / VS Code / Windsurf / Other MCP clients

Add to your MCP config (.mcp.json, mcp.json, or the tool's settings UI):

{
  "mcpServers": {
    "postfast": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "postfast-mcp"],
      "env": {
        "POSTFAST_API_KEY": "your-api-key-here"
      }
    }
  }
}

3. Use it

Ask your AI assistant things like:

• "List my connected social accounts"
• "Schedule a post to Instagram for tomorrow at 9am"
• "Show me all scheduled posts for this week"
• "Upload this image and create a LinkedIn post with it"
• "Create a Facebook reel with this video"
• "Show me analytics for my Instagram posts this month"

Available Tools

Tool	Description
list_accounts	List connected social media accounts (each with connectionStatus — CONNECTED/DISABLED — disabledReason, followerCount/followerCountUpdatedAt, and inboxCapable)
list_posts	List posts with filters (specific IDs, accounts, platform, status, date range); each post carries its key settings in controls (Threads topic, Instagram/Facebook format, TikTok draft flag, YouTube privacy)
create_posts	Create and schedule posts (batch, up to 15)
delete_post	Delete a post from PostFast by ID (does not remove an already-published post from the platform)
delete_posts	Delete up to 100 posts from PostFast in one call; returns deletedIds and notFoundIds (does not remove already-published posts from the platform)
upload_media	Upload a local file and get a media key (handles the full flow)
get_upload_urls	Get signed URLs to upload media files
list_pinterest_boards	Get Pinterest boards for an account
list_youtube_playlists	Get YouTube playlists for an account
list_gbp_locations	Get Google Business Profile locations for an account
search_places	Find a place to tag posts (the id works for both facebookPlaceId and instagramLocationId)
generate_connect_link	Generate a link for clients to connect accounts — optionally scoped to specific platforms, with a redirectUrl the user returns to (carrying status, platform, accountId and your own externalId, plus accountIds after a Facebook or LinkedIn page step)
get_post_analytics	Fetch published posts with performance metrics — Instagram, Facebook, TikTok, Threads, YouTube, LinkedIn (company pages), Pinterest (Business accounts)
get_follower_history	Daily follower-count history for an account (current count + delta over a date range) — Facebook Pages, Instagram, YouTube, Pinterest, Threads, Bluesky, Telegram, LinkedIn (company pages), TikTok
list_tiktok_sounds	Trending pre-cleared Commercial Music Library tracks for a TikTok account (attach via controls.tiktokMusicSoundId)

Social Inbox (comments)

Comments on your posts — TikTok, Instagram, Facebook Pages, and Threads — in one inbox (an account's inboxCapable flag says what is live today). Comments only (no direct messages), from connect onward (no history backfill). Reply capability is always server-computed per conversation (canReply, maxReplyLength, windowState, disabledReason) — render from those fields, never platform assumptions.

Tool	Description
list_inbox_conversations	List comment conversations (filters: platforms, accounts, statuses, unread-only, assignee)
get_inbox_conversation	Fetch one conversation with its reply-capability fields
list_inbox_items	List a conversation's comments and replies (with state and, on Instagram, canPrivateReply)
get_inbox_unread_count	Total unread comment count across the workspace
reply_to_inbox_item	Reply publicly under a specific comment
send_inbox_private_reply	Instagram only: one private reply per comment, within 7 days
set_inbox_item_state	HIDE / UNHIDE / DELETE a comment on the platform (DELETE cannot be undone)
mark_inbox_conversation_read	Zero a conversation's unread count
set_inbox_conversation_status	Triage: OPEN / SNOOZED / CLOSED
assign_inbox_conversation	Assign a conversation to a workspace member (or unassign)

Webhooks

PostFast can send a signed JSON event to your own HTTPS endpoint when a post publishes or fails for good, or when an account connects, reconnects or disconnects. Deliveries follow the Standard Webhooks spec (webhook-id, webhook-timestamp and webhook-signature headers), so any Standard Webhooks library verifies them. On the hosted connector, only workspace admins can use these tools.

Tool	Description
list_webhook_endpoints	List the workspace's endpoints, turned-off ones included (active, disabledReason, last success and failure)
get_webhook_endpoint	Fetch one endpoint
create_webhook_endpoint	Register an HTTPS URL for some or all of post.published, post.failed, account.connected and account.disconnected; the answer carries the signing secret, which is never shown again
update_webhook_endpoint	Change an endpoint's URL, events or description, or turn it off and back on
delete_webhook_endpoint	Delete an endpoint together with its delivery log
test_webhook_endpoint	Send a test event, or a sample of one event type, and see how your receiver answered
list_webhook_deliveries	An endpoint's delivery log for the last 30 days: each attempt's status code, and the payload as sent

Store the secret in your receiver as soon as the endpoint is created. An endpoint receives every event of its types from the whole workspace; to follow one account, filter on data.post.socialMediaId or data.account.id. A workspace can have 5 active endpoints.

Supported Platforms

Facebook, Instagram, X (Twitter), TikTok, LinkedIn, YouTube, BlueSky, Threads, Pinterest, Telegram, Google Business Profile

Platform-Specific Controls

When creating posts, you can pass platform-specific settings via the controls parameter:

Platform	Controls
X (Twitter)	xRetweetUrl
Instagram	instagramPublishType (TIMELINE/STORY/REEL), instagramTrialReelStrategy (MANUAL/SS_PERFORMANCE — trial reel shown to non-followers; Reels only, no collaborators), instagramPostToGrid, instagramCollaborators, instagramLocationId/instagramLocationName (geotag from search_places), instagramIsAiGenerated (adds the "AI info" label; set at creation only)
Facebook	facebookContentType (POST/REEL/STORY), facebookAllowComments, facebookPrivacy, facebookCarouselMainLink, facebookCarouselShowEndCard, facebookReelsCollaborators, facebookTargetCountries (ISO alpha-2, max 25), facebookPlaceId/facebookPlaceName (geotag from search_places)
TikTok	tiktokTitle (photo posts, max 90 chars), tiktokMusicSoundId/tiktokMusicSoundName (Commercial Music Library sound from list_tiktok_sounds; photo, carousel and video posts — on video it plays at 50% volume over the original audio at 50%; exclusive with tiktokAutoAddMusic), tiktokIsDraft, tiktokAllowComments, tiktokAllowDuet, tiktokAllowStitch, tiktokBrandOrganic, tiktokBrandContent, tiktokAutoAddMusic (photo/carousel posts), tiktokIsAigc, tiktokPrivacy (deprecated — account default applies)
YouTube	youtubeTitle, youtubePrivacy (PUBLIC/PRIVATE/UNLISTED), youtubeTags, youtubeCategoryId, youtubeIsShort, youtubeMadeForKids, youtubeContainsSyntheticMedia (altered/synthetic content disclosure; set at creation only), youtubePlaylistId, youtubeThumbnailKey, youtubeLanguage (BCP-47 code such as en-GB or pt-BR; sets the video language and the title and description language), youtubeCaptionKey (an uploaded .srt/.vtt file, added as the video's caption track in youtubeLanguage, which it requires)
Pinterest	pinterestBoardId (required), pinterestLink
LinkedIn	linkedinAttachmentKey (an uploaded PDF, Word or PowerPoint file, max 60MB, shown in the post as pages to swipe through; not with images or video on the same post), linkedinAttachmentTitle (the document's title; "Document" if omitted)
Threads	threadsTopicTag (the post's topic: one topic, not a list; 1-50 chars, no . or &; takes precedence over a #hashtag in the content, which then stays plain text. Like every control it applies to every post in the call, so use separate calls for different topics)
Google Business Profile	gbpLocationId (required), gbpTopicType (STANDARD/EVENT/OFFER), gbpCallToActionType, gbpCallToActionUrl, gbpEventTitle, gbpEventStartDate, gbpEventEndDate, gbpOfferCouponCode, gbpOfferRedeemUrl, gbpOfferTerms

Media Upload

The upload_media tool handles the full flow in a single call:

1. Detects content type from file extension
2. Gets a signed upload URL from PostFast
3. Uploads the file
4. Returns a key and type ready to use in create_posts

Supported formats: JPEG, PNG, GIF, WebP, MP4, WebM, MOV, plus SRT and VTT caption files for YouTube and PDF, DOC, DOCX, PPT and PPTX documents for LinkedIn. A caption file comes back with type CAPTION: pass its key as controls.youtubeCaptionKey, never in mediaItems. A document comes back with type DOCUMENT: pass its key as controls.linkedinAttachmentKey, never in mediaItems.

You can also use get_upload_urls directly if you need more control over the upload process.

Environment Variables

Variable	Required	Description
POSTFAST_API_KEY	Yes	Your workspace API key
POSTFAST_API_URL	No	API base URL (default: https://api.postfa.st)

Testing

Verify everything works with the MCP Inspector:

POSTFAST_API_KEY=your-key npx @modelcontextprotocol/inspector npx postfast-mcp

API Docs

Full REST API documentation: postfa.st/docs

Development

npm install
npm run build
node dist/stdio/index.js

Tools are authored once in src/core (the catalog — schemas, descriptions, annotations, per-binding availability) and exposed to consumers as postfast-mcp/core; src/stdio binds the catalog to the public REST API. Releases: PRs add a .changeset/*.md; npm run version folds them into the bump + changelog, and pushing the vX.Y.Z tag publishes npm + MCP Registry + the MCPB release from CI (OIDC — no tokens anywhere).

Badges

peturgeorgievv-factory/postfast-mcp MCP server

License

MIT