post-bridge

Post Bridge Social Media Skill

Autonomously manage social media posting via Post Bridge API. Post to 9 platforms from a single command or API call.

The CLI is published on npm as postbridge-cli — run it with npx postbridge-cli <command> (no install needed; npx fetches it on first use). Requires Node.js 18+. If npx postbridge-cli is unavailable for any reason, fall back to the bundled script at <skill-path>/scripts/post-bridge.js (same commands and flags).

Freshness check: If more than 30 days have passed since the last-updated date above, inform the user that this skill may be outdated and point them to the update options below.

Keeping This Skill Updated

Source: github.com/post-bridge-hq/agent-mode API docs: api.post-bridge.com/reference

Update methods by installation type:

Installation	How to update
CLI (npx skills)	npx skills update
Claude Code plugin	/plugin marketplace update
Cursor	Remote rules auto-sync from GitHub
Manual	Pull latest from repo or re-copy skills/post-bridge/

Setup

1. Create a Post Bridge account at post-bridge.com
2. Connect your social accounts (TikTok, Instagram, YouTube, Twitter, etc.)
3. Enable API access (Settings > API)
4. Store your API key in workspace .env:

   POST_BRIDGE_API_KEY=pb_live_xxxxx
   

Or run the setup command:

npx postbridge-cli setup --key pb_live_xxxxx

Auth

All requests use Bearer token:

Authorization: Bearer <POST_BRIDGE_API_KEY>

Base URL: https://api.post-bridge.com

Config priority (highest to lowest):

1. POST_BRIDGE_API_KEY environment variable
2. ./.post-bridge/config.json (project-local)
3. ~/.config/post-bridge/config.json (user-global)

Handling "API key not found" errors

When you receive an "API key not found" error from the CLI:

1. Tell the user to run the setup command — setup requires user input, so you cannot run it on their behalf:

   npx postbridge-cli setup --key pb_live_xxxxx
   

2. Stop and wait — do not continue with the task. You cannot create posts or perform any API operations without a valid API key.
3. DO NOT search for API keys in env files, keychains, or other locations.

Get your API key at: https://www.post-bridge.com/dashboard/api-keys

Note for agents: Prefer npx postbridge-cli (the published npm CLI). If the skill is installed locally and you want to run the bundled copy instead, the script lives at <skill-path>/scripts/post-bridge.js — same commands and flags.

CLI Commands

Command	Description
npx postbridge-cli setup --key <key>	Configure API key
npx postbridge-cli accounts	List connected social accounts
npx postbridge-cli post --caption "..." --accounts 1,2,3	Create a post
npx postbridge-cli post --caption "..." --accounts 1,2,3 --schedule "2026-06-20T09:00:00Z"	Schedule a post for a specific time (UTC)
npx postbridge-cli post --caption "..." --accounts 1,2 --use-queue	Auto-schedule to the next queue slot (saved timezone)
npx postbridge-cli post --caption "..." --accounts 1,2 --use-queue --queue-timezone "America/New_York"	Auto-schedule to next queue slot in a specific timezone
npx postbridge-cli post --caption "..." --accounts 1,2 --draft	Save as a draft instead of publishing
npx postbridge-cli post --caption "..." --accounts 1,2 --platform-config '{"tiktok":{"draft":true}}'	Post with per-platform options
npx postbridge-cli upload --file ./image.jpg	Upload media, returns media_id
npx postbridge-cli post --caption "..." --accounts 1,2,3 --media mid_xxx	Post with uploaded media
npx postbridge-cli posts	List recent posts (filters: --status, --platform, --limit, --offset)
npx postbridge-cli posts:get --id <post_id>	Get post details and status
npx postbridge-cli posts:update --id <post_id> --caption "..."	Update a scheduled/draft post (caption, schedule, accounts, media, draft)
npx postbridge-cli posts:delete --id <post_id>	Delete a scheduled/draft post
npx postbridge-cli analytics	View analytics (filters: --platform, --timeframe 7d|30d|90d|all)
npx postbridge-cli analytics:sync	Refresh analytics data (--platform tiktok|youtube|instagram optional)
npx postbridge-cli results --post-id <post_id>	Check per-platform posting results
npx postbridge-cli media	List uploaded media
npx postbridge-cli media:delete --id <media_id>	Delete uploaded media

API Reference

Use these endpoints directly if you prefer raw API calls over the CLI.

Social Accounts

GET /v1/social-accounts

Returns array of connected accounts with id, platform, username. Store these IDs — you need them for every post.

Upload Media

POST /v1/media/create-upload-url
Body: { "mime_type": "video/mp4", "size_bytes": <int>, "name": "video.mp4" }

Returns media_id + upload_url. Then:

PUT <upload_url>
Content-Type: video/mp4
Body: <binary file>

List media:

GET /v1/media?limit=50&offset=0

Delete media:

DELETE /v1/media/<media_id>

Create Post

POST /v1/posts
Body: {
  "caption": "your caption here #hashtags",
  "media": ["<media_id>"],
  "social_accounts": [<account_id_1>, <account_id_2>],
  "scheduled_at": "2026-01-01T14:00:00Z",  // omit for instant post
  "is_draft": false,  // true to save as draft
  "use_queue": true,  // optional, auto-schedule to next queue slot (uses saved timezone)
  "platform_configurations": { ... },  // optional, see below
  "account_configurations": {  // optional, per-account overrides
    "account_configurations": [
      { "account_id": 1, "caption": "override for this account" }
    ]
  }
}

Queue scheduling (use_queue):

• Pass true to auto-schedule using the user's saved timezone from their dashboard settings
• Pass { "timezone": "America/New_York" } to override with a specific IANA timezone
• Cannot be used together with scheduled_at — pick one or the other
• Timezone priority: explicit timezone > saved profile/workspace timezone > UTC
• Queue slots are scoped to the workspace of the selected social accounts
• The queue schedule is configured by the user in their Post Bridge dashboard
• If randomize_queue_time is enabled, the slot time will be offset by up to ±10 minutes for a more natural posting pattern
• Returns an error if no queue schedule is configured or no slots are available in the next 90 days

List Posts

GET /v1/posts?limit=50&offset=0&status=scheduled&platform=instagram

Params: limit, offset, status (scheduled/published/failed/draft), platform.

Get Post

GET /v1/posts/<post_id>

Returns full post details including status: processing, scheduled, posted, failed.

Update Post

PATCH /v1/posts/<post_id>
Body: { "caption": "new caption", "scheduled_at": "...", "social_accounts": [...] }

Can update caption, schedule, accounts, media, platform configs, or draft status. Only works on scheduled/draft posts.

Delete Post

DELETE /v1/posts/<post_id>

Only works on scheduled/draft posts (cannot delete published posts).

Post Results

GET /v1/post-results?post_id=<post_id>&limit=50&offset=0

Returns per-platform results showing whether each platform post succeeded or failed, with error details.

Analytics

List analytics — views, likes, comments, shares per post:

GET /v1/analytics?platform=tiktok&limit=50&offset=0&timeframe=30d

Params:

• platform (optional): tiktok, youtube, instagram
• timeframe (optional): 7d, 30d, 90d, all (default: all)
• limit, offset for pagination

Returns:

{
  "data": [
    {
      "id": "...",
      "post_result_id": "...",
      "platform": "tiktok",
      "platform_post_id": "...",
      "view_count": 4062,
      "like_count": 120,
      "comment_count": 15,
      "share_count": 8,
      "cover_image_url": "https://...",
      "share_url": "https://...",
      "video_description": "...",
      "duration": 30,
      "platform_created_at": "2026-03-01T09:00:00Z",
      "last_synced_at": "2026-03-03T12:00:00Z",
      "match_confidence": "exact"
    }
  ],
  "count": 42,
  "limit": 50,
  "offset": 0
}

Sync analytics — refresh data from connected platforms:

POST /v1/analytics/sync?platform=tiktok

Triggers a background sync of analytics data. Supports all tracked platforms: TikTok, YouTube, and Instagram.

Params:

• platform (optional): tiktok, youtube, or instagram — sync only one platform. Omit to sync all.

Returns:

{
  "triggered": [
    { "platform": "tiktok", "runId": "run_..." },
    { "platform": "youtube", "runId": "run_..." },
    { "platform": "instagram", "runId": "run_..." }
  ]
}

Get single analytics record:

GET /v1/analytics/<analytics_id>

MCP Integration

Post Bridge has a native MCP (Model Context Protocol) server. If you're using Claude Desktop, ChatGPT, Cursor, or any MCP-compatible client, you can connect directly without this skill.

Claude Desktop: One-click connect at post-bridge.com/mcp

Claude Code / Cursor / Other MCP clients — add to your MCP config:

{
  "mcpServers": {
    "post-bridge": {
      "type": "streamable-http",
      "url": "https://mcp.post-bridge.com/mcp"
    }
  }
}

MCP Tools available (11 tools):

Tool	Description
list_social_accounts	List all connected accounts with IDs, platforms, usernames
create_post	Create/schedule a post. Accepts caption, accounts, media_urls, schedule, use_queue (true or {timezone}), platform configs
list_posts	List posts with filters (platform, status, limit, offset)
get_post	Get full post details by ID
update_post	Update caption, schedule, accounts, or media on a scheduled/draft post
delete_post	Delete a scheduled or draft post
list_analytics	Get analytics (views, likes, comments, shares) with platform/timeframe filters
sync_analytics	Trigger a background refresh of analytics data. Optional platform param to sync a specific platform (tiktok/youtube/instagram)
list_post_results	Check per-platform posting results (success/failure with error details)
list_media	List uploaded media files with IDs and URLs
delete_media	Delete an uploaded media file

MCP tools accept media_urls (public URLs) — the server downloads and uploads them automatically. No need to manually upload media when using MCP.

Platform Configurations

Pass inside platform_configurations object on post creation, or use --platform-config with the CLI:

TikTok:

• draft: true — save as draft (publish manually on TikTok with trending sound)
• video_cover_timestamp_ms: 3000 — cover thumbnail at 3 seconds
• is_aigc: true — label as AI-generated content

Instagram:

• video_cover_timestamp_ms: 3000 — cover thumbnail
• is_trial_reel: true — trial reel mode (needs 1000+ followers)
• trial_graduation: "SS_PERFORMANCE" — auto-graduate based on performance

YouTube:

• video_cover_timestamp_ms: 3000 — cover thumbnail
• title: "My Short Title" — override post title

Twitter/X:

• caption: "override caption" — platform-specific caption

Pinterest:

• title: "Pin Title" — pin title
• link: "https://..." — destination URL
• board_ids: ["board_id"] — target boards

All platforms support caption and media overrides for per-platform customization.

Platform Gotchas (important for agents)

These behaviors are easy to miss and cause silent or confusing failures. Account for them before posting.

• X (Twitter) strips URLs from captions. Links (http://, https://, www.) are removed from the X caption before posting. This is intentional (link posts on X cost ~13× more per post). If a link is essential for X, put it in a reply or the user's bio, not the caption — and tell the user the link won't appear in the X post.
• Media must be uploaded, not pasted as a raw link. Do not put a Google Drive / Dropbox / arbitrary external URL into media. The media field takes Post Bridge media_ids only. Either upload the file first (CLI/API) or use media_urls (CLI --media-urls, or the MCP media_urls field) with a direct, public file URL that the server can download. A non-direct share link will fail with a generic error and no per-platform results.
• Very large videos (~300MB+) can silently drop YouTube, LinkedIn, and X. Those three platforms buffer the whole file server-side and may time out / OOM on huge uploads, producing no result row for them while Instagram/TikTok/Facebook/Threads succeed. If results shows fewer platforms than you posted to, suspect file size — re-encode smaller or shorter. Keep videos reasonably sized.
• Each platform posts independently. One platform failing does not stop the others. Always check results --post-id <id> after a publish to confirm per-platform success and read any error details.
• TikTok / Instagram caption + sound limits differ. Keep captions concise; for trending-sound workflows use TikTok draft: true so the user can add the sound and publish manually.

Recommended Workflow for Video Content

1. Store videos in a local folder
2. Extract a frame with ffmpeg to read any text overlays:

   ffmpeg -i video.mp4 -ss 00:00:04 -frames:v 1 frame.jpg -y
   

3. Write caption based on video content + hashtags
4. Upload → create post → schedule or post instantly
5. Move posted videos to a posted/ subfolder to avoid duplicates
6. Set a cron to check post status 5 mins after scheduled time
7. Track performance by checking post results or analytics

Automation Guidelines

When automating posts, follow these rules to keep accounts in good standing:

• No duplicate content across multiple accounts on the same platform
• No unsolicited automated replies — only post original content or when explicitly requested
• No trending manipulation — don't mass-post about trending topics across accounts
• No fake engagement — don't automate likes, follows, or comments
• Respect rate limits — the API has rate limits, don't spam requests
• Use draft mode for review — when in doubt, use is_draft: true or TikTok's draft: true so the user can review before publishing

Publishing confirmation: Unless the user explicitly asks to "post now" or "publish immediately", always confirm before posting. Creating a draft is safe; posting is irreversible and goes live instantly.

Platform Names

Use these exact names for platform filtering and configurations:

• instagram — Instagram (Reels, Stories, Feed)
• tiktok — TikTok
• youtube — YouTube (Shorts)
• twitter — X (formerly Twitter)
• linkedin — LinkedIn
• facebook — Facebook
• pinterest — Pinterest
• threads — Threads
• bluesky — Bluesky

Tips

• Post to multiple platforms simultaneously by including multiple account IDs
• Stagger posts throughout the day (e.g. 9am + 3pm) for better reach
• Use scheduled_at to pre-schedule batches — Post Bridge handles the timing
• Use use_queue: true to auto-schedule posts to the user's next available queue slot using their saved timezone — no need to pick a time manually
• TikTok draft mode lets you add trending sounds manually before publishing
• Keep hashtags to 4-5 per post for best engagement
• Check results after posting to see per-platform success/failure
• Use analytics:sync to refresh data before checking analytics
• Monitor what works and iterate on captions/formats
• Use --draft flag when testing to avoid accidental publishing
• Character limits vary by platform — keep captions concise for X (280 chars)