Install

MCP server — add to your Claude Code config (typically ~/.claude/mcp_settings.json or ~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "cookbook-mcp-postmessage": {
      "command": "npx",
      "args": [
        "-y",
        "cookbook-mcp-postmessage"
      ]
    }
  }
}

Or smoke-test directly:

npx -y cookbook-mcp-postmessage

Details

Website	https://www.npmjs.com/package/cookbook-mcp-postmessage
GitHub	git+https://github.com/steventsao/mcp-postmessage.git
License	unknown
Pricing	free
Tags	mcp model-context-protocol postmessage browser sdk client server iframe
Sources	npm
Discovered	2026-05-25

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