PostFiber for Grok Build

Made by xAI

Add the MCP server to Grok Build with your API key, or give Grok Build the PostFiber skill and the command line.

Connect over MCP

MCP server address

https://www.postfiber.com/mcp

Create an API key in PostFiber under API keys. It is shown once, and it can be limited to one project, to read-only access or to the permissions you choose.

Create an API key in PostFiber under API keys.
Add the server to Grok Build with the settings below.
Ask Grok Build to list your PostFiber channels to check the connection.

Add this to ~/.grok/config.toml, with your key in the POSTFIBER_API_KEY environment variable:

[mcp_servers.postfiber]
url = "https://www.postfiber.com/mcp"
headers = { "Authorization" = "Bearer ${POSTFIBER_API_KEY}" }

Run grok mcp doctor postfiber to check the configuration and the connection, and /mcps inside Grok Build to see the servers it loaded. grok mcp add --transport http adds a server from the command line instead.

Try it

List my connected channels.
Draft a post about our launch for tomorrow at 9:00 and save it as a draft.
Show me what is scheduled for this week.

Keep a person in the loop. An agent works with the permissions of the key, or of the person who connected it. Ask it to save drafts or schedule posts, look at the calendar before anything goes out, and give each key only the project and the permissions it needs. A key or a connected app you revoke stops working at once.

Read the documentation of Grok Build MCP server guide The command line and the skill