PostLake

PostLake — MCP server & agent skills for social media

PostLake is the social media API for AI agents. One integration to publish, schedule, and measure across every network — X, LinkedIn, Instagram, TikTok, Facebook, Threads, Bluesky, YouTube and Pinterest — with one normalised response shape an agent can reason over instead of nine different error formats.

This repo holds the agent skills and documents the hosted MCP server.

• 🔌 MCP server: https://api.postlake.dev/mcp (streamable-http, OAuth)
• 📚 Docs: https://postlake.dev/docs/
• 🌐 Site: https://postlake.dev
• 📖 For LLMs: https://postlake.dev/llms.txt

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MCP configuration

PostLake is a remote MCP server — there is nothing to install, run, or self-host. Point your client at the URL and approve once over OAuth:

{
  "mcpServers": {
    "postlake": {
      "url": "https://api.postlake.dev/mcp"
    }
  }
}

Note: PostLake is not launched with a local command. Any config that runs npx to start this server is incorrect — the server is hosted at the URL above. (The npx skills add … command further down installs the optional agent skills; it does not start an MCP server.)

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Quick start — MCP

Your agent never sees an API key; OAuth handles authorisation.

Claude

claude mcp add postlake https://api.postlake.dev/mcp

Or in Claude Desktop: Settings → Connectors → Add custom connector.

Cursor

~/.cursor/mcp.json:

{
  "mcpServers": {
    "postlake": { "url": "https://api.postlake.dev/mcp" }
  }
}

Gemini CLI

gemini mcp add postlake https://api.postlake.dev/mcp

VS Code / GitHub Copilot

Agent mode → MCP servers → Add, then paste the same URL.

Header auth (for clients without OAuth)

POST https://api.postlake.dev/v1/mcp
Authorization: Bearer <your_api_key>

Then just ask:

"Post this photo to Instagram and LinkedIn, schedule a follow-up for Friday at 9am, and tell me which of last week's posts did best."

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The toolset

A focused set — everything an agent needs to publish and reason about the result, and nothing it doesn't. Account setup and connecting networks stay in the dashboard, where a human belongs.

Group	Tools
Publish & schedule	create_post · edit_post · cancel_post · get_post · list_posts
Discover & validate	get_platform_capabilities · validate_post · get_publish_info
Channels & media	list_social_accounts · list_account_targets · list_profiles · upload_media
Analytics	get_analytics · get_post_analytics
Identity	whoami

Agent-safe by design. Publishing is idempotent — pass an Idempotency-Key and a retrying or restarting agent can never double-post. Every post returns a per-platform state and url in one shape, so there's no per-network branching.

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Agent skills

For coding agents (Claude Code, Cursor, Codex, Windsurf) that use file-based skills rather than MCP:

npx skills add postlake/postlake-mcp --all

Skill	What your agent can do
postlake-accounts	List connected accounts; see what platforms are ready
postlake-publish	Publish a post now to one or more platforms
postlake-schedule	Schedule for later; list, reschedule, or cancel
postlake-media	Upload an image or video and attach it to a post
postlake-analytics	Read per-post and cross-platform performance

Set your key once:

export POSTLAKE_API_KEY="sk_live_…"

Create one at https://app.postlake.dev/app/keys.

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Three ways to connect

	Best for	Auth
MCP server	Claude, Cursor, ChatGPT, Gemini, any MCP client	OAuth (no key exposed)
Agent skills (this repo)	Claude Code, Cursor, Codex, Windsurf	POSTLAKE_API_KEY
REST API	LangChain, CrewAI, AutoGen, OpenAI tools, any language	Bearer key

REST base URL: https://api.postlake.dev/v1 — see the full docs and per-framework guides for LangChain, CrewAI, AutoGen, Python and Node.js.

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Security

Agents authorise over OAuth, so an API key is never pasted into a chat or seen by the model. Every agent you authorise appears under Connected Apps in your dashboard — revoke any one and its access is cut off immediately.

Pricing

Usage-based credits: 1 credit per post, with a free tier and no card to start. X costs more because it's the only network that charges per post. See https://postlake.dev/pricing.

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Listed in the official MCP Registry as dev.postlake/social.

Made by CrumbleLake. Issues and PRs welcome.