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 agentmods add skills/triuzzi/brave-devtools-mcp/brave-devtoolsnpx skills add triuzzi/brave-devtools-mcp --skill brave-devtoolsgit clone --depth 1 https://github.com/triuzzi/brave-devtools-mcpWrote 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/triuzzi/brave-devtools-mcp/brave-devtools)<a href="https://agentmods.dev/skills/triuzzi/brave-devtools-mcp/brave-devtools"><img src="https://agentmods.dev/badge/skills/triuzzi/brave-devtools-mcp/brave-devtools.svg" alt="Measured on agentmods" 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 | $0.00056 | $0.00940 |
| Opus 5 | $0.00028 | $0.00470 |
| Sonnet 5 | $0.00011 | $0.00188 |
| Haiku 4.5 | $0.00006 | $0.00094 |
Grade A, and why
brave-devtools 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 4d 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.
This is a copy
88% identical to chrome-devtools — 14 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Core Concepts
Browser lifecycle: Browser starts automatically on first tool call using a persistent Brave profile. Configure via CLI args in the MCP server configuration: npx brave-mcp@latest --help.
Addional tooling can be enabled by providing the following flags:
- For extension tooling, use the
--categoryExtensionsflag. - For memory tooling, use the
--memoryDebuggingflag.
Page targeting: Page-scoped tools require a pageId parameter to target a specific page. Use list_pages to see available pages and their IDs (e.g. pageId: 1), or use the ID returned when creating a page with new_page.
Note: For evaluate_script, pageId is required when targeting pages. However, when --categoryExtensions is enabled, pageId is optional so you can pass serviceWorkerId instead to evaluate inside an extension background service worker.
Element interaction: Use take_snapshot to get page structure with element uids. Each element has a unique uid for interaction. If an element isn't found, take a fresh snapshot - the element may have been removed or the page changed.
Workflow Patterns
Before interacting with a page
- Navigate:
navigate_pageornew_page - Wait:
wait_forto ensure content is loaded if you know what you look for. - Snapshot:
take_snapshotwithpageIdto understand page structure - Interact: Use element
uids from snapshot forclick,fill, etc., passing the correspondingpageId.
Efficient data retrieval
- Use
filePathparameter for large outputs (screenshots, snapshots, traces) - Use pagination (
pageIdx,pageSize) and filtering (types) to minimize data - Set
includeSnapshot: falseon input actions unless you need updated page state
Tool selection
- Automation/interaction:
take_snapshot(text-based, faster, better for automation) - Visual inspection:
take_screenshot(when user needs to see visual state) - Additional details:
evaluate_scriptfor data not in accessibility tree
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.
- 4d ago First seen · 74 lines · 56 tokens per session scan A 467219526046
brave-devtools is a skill published in the GitHub repository triuzzi/brave-devtools-mcp (28 stars, last pushed 3d ago), licensed Apache-2.0. It adds 56 tokens to every session and 940 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 88% identical to chrome-devtools, differing in 14 lines, and is treated as a copy.
Other skills, from other repositories
chrome-devtools-cli
Use this skill to write shell scripts or run shell commands to automate tasks in the browser or otherwise use Chrome DevTools via CLI.
cookie-debugging
Uses Chrome DevTools MCP for inspecting, debugging, and testing cookies, session state, authentication issues, and cookie consent compliance. Use when diagnosing 401/403 errors, authentication redirects, session expiration, Cookie/Set-Cookie header issues, cookie banner consent conformance, or third-party…
chrome-devtools
Uses Chrome DevTools via MCP for efficient debugging, troubleshooting and browser automation. Use when debugging web pages, automating browser interactions, analyzing performance, or inspecting network requests. This skill does not apply to --slim mode (MCP configuration).
control-chrome-bridge
Drive the user's real Chrome browser — their own profile, tabs, cookies and logged-in sessions — through the chrome-bridge MCP server. Use for tasks that need existing browser state: reading a page behind a login, filling a form on a site the user is signed into, testing a local app in a real browser, or inspecting…
webview-devtools
Use webview-devtools-mcp to inspect and automate an already-instrumented WebView/page: choose this skill when the user’s target environment is configured so the page injects wdmcp’s target.js (or the user is explicitly asking to work with such a configured WebView). If the page is not yet injecting target.js, do not…
a11y-debugging
Uses Chrome DevTools MCP for accessibility (a11y) debugging and auditing based on web.dev guidelines. Use when testing semantic HTML, ARIA labels, focus states, keyboard navigation, tap targets, and color contrast.