Chrome DevTools MCP is an MCP server that lets coding agents control and inspect a live Chrome browser for automation, debugging, screenshots, network analysis, console inspection, and performance tracing. It is for developers who want AI coding assistants to test and diagnose web applications, and the catalogue add-ons provide workflows for using those browser tools.
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 ChromeDevTools/chrome-devtools-mcp --skill troubleshootinggit clone --depth 1 https://github.com/ChromeDevTools/chrome-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/chromedevtools/chrome-devtools-mcp/troubleshooting)<a href="https://agentmods.dev/skills/chromedevtools/chrome-devtools-mcp/troubleshooting"><img src="https://agentmods.dev/badge/skills/chromedevtools/chrome-devtools-mcp/troubleshooting/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/chromedevtools/chrome-devtools-mcp/troubleshooting"><img src="https://agentmods.dev/badge/skills/chromedevtools/chrome-devtools-mcp/troubleshooting.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Agent Snooping · line 12 Skill accesses MCP server configuration files (mcp.json). MCP configs contain server URLs, authentication tokens, and tool definitions — reading them allows the skill to discover and potentially abuse other tool integrations.Fix: Remove all code or instructions that read MCP configuration files (mcp.json). MCP server details should be managed by the agent runtime, not read by individual skills.
- medium MCP Rug Pull · line 91 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 92 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00040 | $0.01514 |
| Opus 5.5 | $0.00016 | $0.00606 |
| Sonnet 5.5 | $0.00008 | $0.00303 |
| Haiku 4.5 | $0.00004 | $0.00151 |
Grade B, and why
troubleshooting scanned grade B with 1 finding 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 6d 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.
Reads MCP configurationmediumAgent snooping
mcp.json carries server URLs and auth tokens; reading it lets a mod discover and abuse other integrations.
Your first action should be to locate and read the MCP configuration file. Search for the following files in the user's workspace: `.mcp.json`, `.vscode/mcp.json`, `gemini-extension.json`, or `.gemini/settings.json` (or Copies of this mod
8 near-identical copies found in the catalogue:
- troubleshooting — 100% identical, 11 lines differ
- troubleshooting — 100% identical, 11 lines differ
- troubleshooting — 100% identical, 12 lines differ
- troubleshooting — 100% identical, 12 lines differ
- troubleshooting — 98% identical, 12 lines differ
- troubleshooting — 98% identical, 12 lines differ
- troubleshooting — 95% identical, 17 lines differ
- troubleshooting — 95% identical, 17 lines differ
How it starts
The opening of the file, as written. The whole thing — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Troubleshooting Wizard
You are acting as a troubleshooting wizard to help the user configure and fix their Chrome DevTools MCP server setup. When this skill is triggered (e.g., because list_pages, new_page, or navigate_page failed, or the server wouldn't start), follow this step-by-step diagnostic process:
Step 1: Find and Read Configuration
Your first action should be to locate and read the MCP configuration file. Search for the following files in the user's workspace: .mcp.json, .vscode/mcp.json, gemini-extension.json, or .gemini/settings.json (or user-scoped files such as ~/.claude.json if accessible).
If you find a configuration file, read and interpret it to identify potential issues such as:
- Incorrect arguments or flags.
- Missing environment variables.
- Usage of
--autoConnectin incompatible environments.
If you cannot find any of these files, only then should you ask the user to provide their configuration file content.
Step 2: Triage Common Connection Errors
Before reading documentation or suggesting configuration changes, check if the error message matches one of the following common patterns.
Error: Could not find DevToolsActivePort
This error is highly specific to the --autoConnect feature. It means the MCP server cannot find the file created by a running, debuggable Chrome instance. This is not a generic connection failure.
Your primary goal is to guide the user to ensure Chrome is running and properly configured. Do not immediately suggest switching to --browserUrl. Follow this exact sequence:
- Ask the user to confirm that the correct Chrome version (e.g., "Chrome Canary" if the error mentions it) is currently running.
- If the user confirms it is running, instruct them to enable remote debugging. Be very specific about the URL and the action: "Please open a new tab in Chrome, navigate to
chrome://inspect/#remote-debugging, and make sure the 'Enable remote debugging' checkbox is checked." - Once the user confirms both steps, your only next action should be to call the
list_pagestool. This is the simplest and safest way to verify if the connection is now successful. Do not retry the original, more complex command yet. - If
list_pagessucceeds, the problem is resolved. If it still fails with the same error, then you can proceed to the more advanced steps like suggesting--browserUrlor checking for sandboxing issues.
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.
- 6d ago Changed 80357d865f96
- 7d ago Changed · -1 lines 16b47984a96b
- 12d ago Changed d137f7109e0e
- 1mo ago First seen · 100 lines · 40 tokens per session scan B e534a7845f71
troubleshooting is a skill published in the GitHub repository ChromeDevTools/chrome-devtools-mcp (53,865 stars, last pushed yesterday), licensed Apache-2.0. It adds 40 tokens to every session and 1,514 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads mcp configuration). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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