POSTFACT MCP Server: Install & Setup

Install POSTFACT in Claude Code

Claude Code

claude mcp add --transport http postfact https://postfact-api-production.up.railway.app/mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "postfact": {
      "url": "https://postfact-api-production.up.railway.app/mcp"
    }
  }
}

Frequently asked questions

What does the POSTFACT MCP server do?

Resolve whether an uncertain side-effecting action completed before software retries it.

Is the POSTFACT MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does POSTFACT run locally or remotely?

Remote. Hosted by the provider. You connect with a URL, nothing to install.

How do I add POSTFACT to Claude Code?

Run: claude mcp add --transport http postfact https://postfact-api-production.up.railway.app/mcp

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