Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add HermeticOrmus/LibreUIUX-Claude-Code --skill browser-devtools-mcpgit clone --depth 1 https://github.com/HermeticOrmus/LibreUIUX-Claude-CodeWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/hermeticormus/libreuiux-claude-code/browser-devtools-mcp)<a href="https://agentmods.dev/skills/hermeticormus/libreuiux-claude-code/browser-devtools-mcp"><img src="https://agentmods.dev/badge/skills/hermeticormus/libreuiux-claude-code/browser-devtools-mcp/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/hermeticormus/libreuiux-claude-code/browser-devtools-mcp"><img src="https://agentmods.dev/badge/skills/hermeticormus/libreuiux-claude-code/browser-devtools-mcp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00038 | $0.04300 |
| Opus 5.5 | $0.00015 | $0.01720 |
| Sonnet 5.5 | $0.00008 | $0.00860 |
| Haiku 4.5 | $0.00004 | $0.00430 |
Grade A, and why
browser-devtools-mcp scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 27d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 717 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Browser DevTools MCP Integration
Leverage browser automation and DevTools through MCP (Model Context Protocol) for live UI inspection, screenshot-to-code workflows, and visual debugging. This skill enables direct observation and manipulation of running interfaces.
When to Use This Skill
- Capturing screenshots of live UIs for analysis
- Inspecting CSS and computed styles programmatically
- Implementing screenshot-to-code workflows
- Debugging layout issues with visual feedback
- Extracting design tokens from existing sites
- Automating visual regression testing
- Building live preview workflows
MCP Architecture Overview
What is MCP?
Model Context Protocol (MCP) is Anthropic's standard for connecting LLMs to external tools. It provides:
- Standardized tool interface - Consistent way to expose capabilities
- Bidirectional communication - Tools can query the model
- Stateful sessions - Maintain context across interactions
- Permission boundaries - Control what tools can do
Browser MCP Landscape
+-------------------+ +-------------------+ +-------------------+
| Playwright MCP | | Puppeteer MCP | | Chrome DevTools |
| (Full browser) | | (Headless) | | Protocol (CDP) |
+-------------------+ +-------------------+ +-------------------+
| | |
+-----------+-------------+-----------+-------------+
| |
+------v------+ +------v------+
| Screenshot | | Element |
| Capture | | Inspection |
+-------------+ +-------------+
| |
+------v------+ +------v------+
| Visual | | Style |
| Comparison | | Extraction |
+-------------+ +-------------+
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 27d ago First seen · 717 lines · 38 tokens per session scan A 7656229cf7a2
browser-devtools-mcp is a skill published in the GitHub repository HermeticOrmus/LibreUIUX-Claude-Code (115 stars, last pushed 12d ago), licensed MIT. It adds 38 tokens to every session and 4,300 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-20.
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