# Subtext Verify

> Gives Gemini CLI a hosted browser to test your running app and leave before/after proof of each UI change for reviewers.

Subtext Verify is the companion to Fullstory's Subtext. It lets your agent open a cloud-hosted browser against your running app, prove a UI change with before/after screenshots and network traces, and leave the evidence where reviewers will see it: in proof documents, viewer links and comments. As a Gemini CLI extension it adds Verify's skills and the Subtext tunnel, a local MCP server that lets the hosted browser reach your localhost dev server.

What you can do with it
- Connect a hosted Chromium browser to your app, or to a local dev server through the tunnel, and share a trace link you can watch live and replay later
- Click, fill, hover, drag, upload files and press keys, and wait for the page to settle
- Take component-tree snapshots and screenshots, inspect network requests and console messages, and emulate devices
- Capture before/after evidence of a UI change in a proof document, with screenshots, diffs and logs, then close it as a permanent record
- Leave comments on a page for your team, and read, reply to and resolve their feedback
- Start a .sightmap/ of your components, so the next agent understands the UI without reading the source

How it connects
Install Subtext first: its hosted subtext MCP server serves Verify's live-browser, proof document and comment tools. Then install this extension with gemini extensions install https://github.com/fullstorydev/subtext-verify. It adds the subtext-tunnel server (npx -y @subtextdev/subtext-cli@latest tunnel mcp), which the hosted browser needs only to reach localhost.

Good to know
- Verify is in closed beta: its tools appear only when your Subtext org has the verification flag turned on. You can join the waitlist at subtext.fullstory.com.
- Reviewing recorded sessions and managing privacy rules live in Subtext itself, not here.
- Uploading a project's .sightmap/ for richer snapshots needs Python 3.9 or later and PyYAML.
- Close the hosted browser when you're done: open connections count against your quota.

- Type: Plugin
- Made by: Fullstory
- Category: Web & browser
- Formats: Extensions
- Version: 0.2.0
- Website: https://subtext.fullstory.com/docs/verify/overview
- Source: https://github.com/fullstorydev/subtext-verify
- Page: https://pluginboard.ai/plugins/subtext-verify

## Works with

- Gemini CLI

## Install

### Gemini CLI

Run in your terminal:

```shell
gemini extensions install https://github.com/fullstorydev/subtext-verify
```

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From Pluginboard (https://pluginboard.ai).