Social Publishing via BulkPublish

Cross-platform scheduling and publishing through one API. Unlike per-platform skills, this targets many networks in a single call, with each platform's rules enforced up front.

Setup

MCP (recommended) — hosted server, no install:

claude mcp add --transport http bulkpublish https://mcp.bulkpublish.com/mcp

Add it as a custom connector and OAuth 2.1 walks you through consent — no key in the URL.

Or the npm server (stdio):

claude mcp add bulkpublish --env BULKPUBLISH_API_KEY=bp_your_key -- npx -y @bulkpublish/mcp-server

Or plain REST: https://app.bulkpublish.com/api, spec at https://app.bulkpublish.com/openapi.json, docs at https://app.bulkpublish.com/docs.

Get an API key at app.bulkpublish.com/developer and send it as Authorization: Bearer <key>. API and MCP access are on every plan, free included.

Workflow

1. list_channels — get connected accounts with their channelId and platform. Do this first; never guess a channel id.
2. Check the platform rules below (or get_channel_options) before composing.
3. Upload media if needed — upload_media takes a public url or a local filePath, and returns the id you pass in mediaFileIds.
4. create_post with content, channels, and status: "scheduled" plus scheduledAt (or leave it a draft, then publish_post when the user confirms).
5. Confirm the exact text, target accounts, and time with the user before publishing.

create_post essentials

content            (string, required)      — post text
channels           (array,  required)      — [{ channelId: number, platform: string }]
status             ("draft" | "scheduled") — default "draft"
scheduledAt        (ISO 8601 string)       — required when status is "scheduled"
timezone           (string)                — e.g. "America/New_York"
mediaFileIds       (number[])              — ids from upload_media
platformContent    (object)                — per-platform text override
postTypeOverrides  (object)                — per-platform post type, e.g. {"instagram":"reel"}
platformSpecific   (object)                — per-platform extras (titles, link previews)
requestApproval    (boolean, false)        — hold the post for human review

create_post schedules or drafts. To send something out immediately, create it and then call publish_post; retry_post re-runs a failed one.

Platform rules that actually break posts

• YouTube and TikTok require video. Never include them on an image-only or text-only post.
• YouTube and Pinterest require a title — set platformSpecific.youtube.title / platformSpecific.pinterest.title.
• Instagram defaults to feed_photo. With a video you must set postTypeOverrides.instagram to reel or feed_video, or the post fails.
• Instagram needs a Business or Creator account — personal accounts are rejected.
• Character limits differ sharply: X 280, Bluesky 300, Threads / Mastodon / Google Business 500, Pinterest 1,500, Discord 2,000, Instagram / TikTok 2,200, LinkedIn 3,000, Telegram 4,096, YouTube 5,000, Facebook 63,206. Use platformContent to give the short networks their own trimmed text rather than truncating everything down to the smallest limit.
• Facebook cannot mix images and video in one post.

Approvals

Posts carry an approvalStatus (none | pending | approved | rejected) separate from status. The scheduler never publishes a pending or rejected post. Pass requestApproval: true to hold a post for a human; approve_post / reject_post release it. API keys whose role lacks post:publish always have it forced on and get 403 APPROVAL_REQUIRED from publish and retry — that is expected, not a bug.

Analytics

get_analytics takes startDate / endDate (ISO dates) and returns a summary with a per-platform breakdown; get_post_metrics covers a single post. Outbound linkClicks are measured by BulkPublish's own short links and are reported separately from clicks — one visit can appear in both, so never add them together.

Other tools

get_channel_health (re-auth needed?), get_queue_slot (next optimal time for a timezone), create_schedule (recurring posts), list_labels, get_quota_usage (plan limits and usage).

Rules

• Read the docs or the OpenAPI spec rather than inventing endpoints or parameters.
• Confirm channel ids from list_channels before every publish.
• Show the user the exact text, accounts and time before anything goes out.
• If a platform cannot do what was asked, say so instead of silently dropping it.