Add the PostHog MCP server to Windsurf

Config last verified Jun 1, 2026

The exact config to run PostHog in Windsurf — paste it in, restart, and the tools load.

Prerequisites

Windsurf installed.
POSTHOG_AUTH_HEADER — The string 'Bearer <your-personal-api-key>' used to authenticate to the remote endpoint when bridging through mcp-remote.

Setup

1. Open `~/.codeium/windsurf/mcp_config.json`

On Windows the file lives at %USERPROFILE%\.codeium\windsurf\mcp_config.json.

2. Add this configuration

Add to ~/.codeium/windsurf/mcp_config.json

~/.codeium/windsurf/mcp_config.json

json

{
  "mcpServers": {
    "posthog": {
      "serverUrl": "https://mcp.posthog.com/mcp"
    }
  }
}

Heads up

Windsurf uses `serverUrl` for remote servers.

3. Restart Windsurf and confirm the PostHog tools load.

Gotchas

Windsurf uses `serverUrl` for remote servers.

Windsurf's Cascade reads MCP servers from an "mcpServers" object in ~/.codeium/windsurf/mcp_config.json. Unlike most clients, remote servers are configured with the "serverUrl" field rather than "url", so a config that uses "url" silently fails to connect. Native remote transport is supported without an OAuth flow.

← Back to the PostHog MCP server