Verdict

Token-efficient browser verification for AI coding agents.

A persistent headless Chromium CLI. ~75 tokens per call vs ~1,500 with Playwright MCP. Same ARIA snapshot technology, 95% cheaper.

Works with Claude Code, Codex CLI, Cursor, Copilot, and Gemini CLI.

Inspired by gstack by Garry Tan.

Installation

Install globally:

npm install -g verdict-cli

Or add to your project:

npm install verdict-cli

Chromium installs automatically via Playwright.

Requirements: Node.js 18+

Quick Start

verdict goto https://example.com
verdict snapshot -i
verdict click @e3
verdict fill @e5 "hello"
verdict snapshot -D
verdict stop

The server auto-starts on first call (~3s). Subsequent calls take ~100-200ms.

Token Savings

Tool	Per call	20 calls	Savings
Playwright MCP	~1,500 tokens	~30,000 tokens	—
Verdict	~75 tokens	~1,500 tokens	95%

Usage

Navigation

verdict goto https://example.com
verdict back
verdict forward
verdict reload
verdict url
verdict title

Snapshots and Refs

Take an ARIA snapshot. Interactive elements get @e refs.

verdict snapshot              # full ARIA tree
verdict snapshot -i           # interactive elements only
verdict snapshot -D           # diff against previous snapshot
verdict snapshot -a           # annotated screenshot with ref labels
verdict snapshot -C           # include cursor-clickable @c refs

Output looks like this:

@e1 - link "Home"
@e2 - button "Search"
@e3 - textbox "Email"

Use refs in any command: click @e2, fill @e3 "test".

Interaction

verdict click @e3
verdict fill @e5 "user@test.com"
verdict select @e7 "Option A"
verdict hover @e2
verdict type @e5 "slow typing"
verdict press Enter
verdict scroll @e10
verdict wait 2000

Snapshot Diff

Verify an action changed the page:

verdict snapshot -i
verdict click @e2
verdict snapshot -D

--- previous
+++ current
- @e5 - button "Submit"
+ @e5 - button "Loading..."
+ @e12 - text "Form submitted successfully"

CSS Inspection

Read any computed CSS value:

verdict css @e3 padding
verdict css @e3 font-size
verdict css @e3 background-color

Get a full box model with 16 computed styles:

verdict inspect @e3

Live Style Mutation

Modify CSS live with undo support:

verdict style @e3 color red
verdict style @e3 padding 20px
verdict style --history
verdict style --undo

Responsive Testing

Screenshot at mobile, tablet, and desktop in one command:

verdict responsive /tmp

Screenshots

verdict screenshot /tmp/page.png
verdict screenshot /tmp/full.png --full
verdict viewport 375x812

JavaScript and Debugging

verdict js "document.title"
verdict console
verdict network
verdict perf

Auth Profiles

Save and reload authenticated sessions. Encrypted with AES-256-CBC.

verdict goto https://app.com/login
verdict handoff                          # open visible Chrome
# ... log in manually (SSO, MFA, CAPTCHA) ...
verdict resume                           # back to headless
verdict auth-save myapp                  # save session encrypted

Reload in one command:

verdict goto-auth https://app.com/dashboard --profile myapp

Manage profiles:

verdict auth-list
verdict auth-delete myapp

Tabs and Frames

verdict tabs
verdict newtab https://example.com
verdict tab 1
verdict closetab
verdict frame iframe#content
verdict frame-exit

Batch Commands

Run multiple commands in one call:

verdict chain '[["goto","https://example.com"],["snapshot","-i"],["console"]]'

Page Diff

Compare two pages:

verdict diff https://example.com https://example.com/about

Cookies

verdict cookies
verdict cookie-set session abc123 example.com
verdict cookie-import example.com

Server Management

verdict status
verdict stop

Agent Setup

Claude Code

Add to .claude/settings.json:

{
  "permissions": {
    "allow": [
      "Bash(verdict*)",
      "Bash(npx verdict*)"
    ]
  }
}

Create .claude/rules/verdict.md:

Use Verdict for all browser verification:

    verdict goto <url>
    verdict snapshot -i
    verdict click @e3

Fall back to Playwright MCP for drag-and-drop only.

Other Agents

Verdict works with any agent that can run Bash commands. Install globally and call verdict directly.

Configuration

Variable	Default	Description
VERDICT_DATA_DIR	.verdict-data/	Data directory for state and profiles
VERDICT_IDLE_TIMEOUT	1800000 (30 min)	Server idle shutdown in ms
VERDICT_PORT	Random	Fixed port for the server

Architecture

AI Agent  →  Bash  →  CLI client (bin/browse.mjs)
                           ↓ HTTP POST (localhost)
                       Server (src/server.mjs)
                           ↓ Playwright API
                       Chromium (headless)

The CLI client is a thin HTTP wrapper (~1ms overhead). The server is a persistent Node.js daemon with random port, bearer token, and localhost-only binding. Auth profiles use AES-256-CBC with a scrypt-derived machine-specific key.

Comparison

Feature	Verdict	Playwright MCP	agent-browser
Token cost/call	~75	~1,500	~similar
CSS inspection	Yes	No	No
Style mutation + undo	Yes	No	No
Responsive presets	Yes	No	No
Snapshot diff	Yes	No	Yes
Auth profiles (AES-256)	Yes	No	Yes
Handoff/resume	Yes	No	No
Batch commands	Yes	No	No
Persistent daemon	Yes	Per-session	Yes

Contributing

Fork the repo and create a pull request. Bug reports and feature requests welcome on GitHub Issues.

License

MIT