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Free beta. The Marky API is free to use while it’s in beta. Paid plans are coming later, and we’ll give you plenty of notice before any charges begin.
ChatGPT and Codex both speak MCP, the same protocol Marky’s MCP server serves. Point them at one URL and they get Marky’s tools: list your workspaces, generate on-brand drafts, create posts, schedule them, and check what published. There is nothing extra to install on our side. It is the same endpoint, the same API key, and the same tools that Claude Code uses.

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Two ways to sign in

Pick whichever your client offers: Both give the same access. Signed-in agents show up under Organization settings → Connected agents, where you can disconnect one at any time.

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ChatGPT on the web

This is where most people connect. You need Developer mode turned on first, and it has to be done in a browser — the mobile app has no connector screen.
  1. Go to chatgpt.com.
  2. Open Settings → Apps & Connectors.
  3. Open Advanced settings and turn on Developer mode.
  4. Go back to Apps & Connectors and click Create.
  5. Paste https://api.mymarky.ai/api/mcp as the server URL, then click Create.
  6. Sign in with your Marky account when ChatGPT asks, and click Allow.
Then ask ChatGPT: “List my Marky businesses.” If it names your workspaces, you’re connected.
Developer mode is not on free ChatGPT accounts. If you can’t find it, that’s usually why. On a managed work account an admin may also have to allow custom connectors first.OpenAI renames these menus fairly often, so if a label above doesn’t match what you see, the destination is still right: you’re looking for the screen that creates a connector from a URL. Their current walkthrough is at learn.chatgpt.com/docs/extend/mcp.

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ChatGPT desktop app

The desktop app has its own screen for this, and no Developer mode step:
  1. Open Settings → MCP servers → Add server.
  2. Name it Marky and choose Streamable HTTP.
  3. URL: https://api.mymarky.ai/api/mcp
  4. For auth, either paste your mk_live_... key as a bearer token, or pick OAuth and press Authenticate to sign in with your Marky account.
  5. Save, then Restart.
Then ask:
“List my Marky businesses, read the brand, then write 5 posts about our spring blend and schedule one each weekday at 9am.”

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Codex CLI

One command:
Then put your key in that environment variable:
Or edit ~/.codex/config.toml by hand:
If Codex ignores the url line, update Codex first. Older builds only read HTTP servers when the newer MCP client is switched on, and they fail by doing nothing at all rather than by printing an error. On a build like that, add experimental_use_rmcp_client = true above the [mcp_servers.marky] line.
Prefer to sign in instead of keeping a key around? Leave the token out and log in once:
Check it worked with codex mcp list.

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What about skills?

Marky’s packaged skills — short instruction files that teach an agent how we like posts made — are published for Claude Cowork today. See Connect Claude to Marky. For ChatGPT and Codex, the MCP server above is the piece that matters: it gives the assistant Marky’s real tools, which is what a skill would call anyway. If you want the same nudges in writing, drop a short file like this into your project’s AGENTS.md (Codex reads it automatically):

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Before you start

  • Connect your social accounts first. Adding Instagram, Facebook, LinkedIn and the rest is a one-time step in the Marky web app. An agent can see the accounts you’ve connected, but it can’t add new ones.
  • API keys are created by an organization admin at Organization settings → API keys. See Authentication.
  • Keep your key in an environment variable, not in a file you commit.
  • Full tool list: MCP Server and the API Reference.