Make your first live tool call

Download the WebMCP Today extension ZIP and extract it. Then open the browser's extensions page, enable Developer mode, choose Load unpacked, and select the extracted folder. The extension must remain enabled in the same browser that will hold your target tab.

Install the Reddit package from its popup rather than relying on a registry-page Install button. If the readiness check says either WebMCP API is unavailable, use its copy-only settings path, enable WebMCP testing, relaunch, and check again. Do not enable it preemptively when the runtime check already passes.

Install the published MCP bridge globally, then add its command to your MCP client. After restarting the client, ask it to callsetup_webmcp_bridge with {"browser":"chrome","confirm":true}(or use brave). The confirmation-gated tool copies the durable host and writes only this bridge's per-user native-messaging manifest; it does not expose an HTTP service.

npm install --global @webmcp-today/mcp-bridge@0.1.0

Add the server without replacing your other MCP servers, then restart or reload the client. This OpenCode example invokes the globally installed command.

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "webmcp-today": {
      "type": "local",
      "command": ["webmcp-today-mcp"]
    }
  }
}

Call get_webmcp_bridge_status after setup, then continue only when it reports ready. The server exposes list_connected_webmcp_tabs, list_webmcp_tools, and execute_webmcp_tool. The webpage cannot see a native host or MCP client: the successful tab-list call is the real handoff check.

In your normal browser, open https://www.reddit.com/r/webdev/ and make that tab visible and selected. Open the WebMCP Today extension popup, inspect the suggested Reddit package, and click Install. This remains a browser-owned consent action; your agent cannot perform it for you. The extension registers the package into the already open matching tab.

If tools are missing, install or repair the package from the popup and list the tools again. Do not substitute DOM scraping or arbitrary page execution for a missing tool.

Ask the MCP client to list connected tabs, then list the tools in the selected Reddit tab. A successful installed package contributes 6 Reddit tools, includingreddit_subreddit_hot. Call it with {"subreddit":"webdev","limit":5}, passing the document and tools generations returned from the tool-list call.

Use the WebMCP Today MCP server to verify a live, read-only Reddit call.

1. I have selected the normal browser tab at https://www.reddit.com/r/webdev/.
2. Call list_connected_webmcp_tabs, then list_webmcp_tools for that tab.
3. If reddit_subreddit_hot is missing, ask me to open the WebMCP Today extension popup, inspect the suggested Reddit package, and click Install. Wait for my confirmation, then list tools again in the same tab.
4. Call reddit_subreddit_hot with {"subreddit":"webdev","limit":5}, using the document and tool-list generations returned by list_webmcp_tools.
5. Show five returned titles and permalinks.

Do not substitute DOM scraping or arbitrary page execution for the missing tool.

Success: five current post titles and permalinks return from Reddit's own JSON API. This is generic WebMCP tool passthrough: the bridge lists and executes whatever live tools are registered in the selected tab. It has no package-only fallback when WebMCP is unavailable.