Can Copilot post to LinkedIn?

GitHub Copilot in VS Code: the config

VS Code reads MCP servers from .vscode/mcp.json. The hosted OpenTweet server needs your key in an Authorization header and has no OAuth sign-in, so the URL alone returns 401. The input variable below makes VS Code ask for the key once and store it, so it never sits in a file you might commit.

{
  "inputs": [
    {
      "type": "promptString",
      "id": "opentweet-key",
      "description": "OpenTweet API key (ot_...)",
      "password": true
    }
  ],
  "servers": {
    "opentweet": {
      "type": "http",
      "url": "https://mcp.opentweet.io/mcp",
      "headers": { "Authorization": "Bearer ${input:opentweet-key}" }
    }
  }
}

Open Copilot Chat, switch to agent mode, and ask for the post. Ask mode and edit mode do not call tools. If the tools do not show in the tool picker, fully quit and reopen VS Code.

What Copilot sends

A prompt like "Turn this changelog into a LinkedIn post and schedule it for Monday 2pm UTC" becomes one tool call. Always name LinkedIn in the prompt, so the call carries an explicit platforms list rather than falling back to your account's cross-post setting.

opentweet_create_tweet({
  text: "We moved our job queue to Postgres. Three things we learned.",
  platforms: ["linkedin"],
  scheduled_date: "2026-09-29T14:00:00Z"
})

Add "x" and "bluesky" to the array and the same draft goes to all three networks. Drop scheduled_date and pass publish_now: true to post immediately.