MockServer is a testing server and proxy that imitates APIs, records and changes network traffic, and deliberately introduces failures. It is for developers testing applications against unavailable dependencies, debugging requests, and checking how systems handle degraded services across several network protocols. The catalogue add-ons help operate, configure, and test MockServer.
Borrowing it
Nothing to install: this file belongs to mock-server/mockserver-monorepo. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/mock-server/mockserver-monorepo/master/.opencode/skills/browser-auth/SKILL.mdgit clone --depth 1 https://github.com/mock-server/mockserver-monorepoWrote 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/mock-server/mockserver-monorepo/browser-auth)<a href="https://agentmods.dev/skills/mock-server/mockserver-monorepo/browser-auth"><img src="https://agentmods.dev/badge/skills/mock-server/mockserver-monorepo/browser-auth/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/mock-server/mockserver-monorepo/browser-auth"><img src="https://agentmods.dev/badge/skills/mock-server/mockserver-monorepo/browser-auth.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, 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 YARA Match · line 44 YARA rule matched a known malware signature (reverse shell, backdoor, ransomware, C2 framework, or info stealer).Fix: Remove the malware payload or compromised file entirely. Investigate how it entered the skill and audit all other artifacts for additional indicators of compromise.
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 | $0.00093 | $0.01768 |
| Opus 5.5 | $0.00037 | $0.00707 |
| Sonnet 5.5 | $0.00019 | $0.00354 |
| Haiku 4.5 | $0.00009 | $0.00177 |
Grade A, and why
browser-auth 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 1mo 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 — 214 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Chrome DevTools MCP — Browser Authentication Patterns
Use the Chrome DevTools MCP server to interact with authenticated web pages (Buildkite, AWS Console, GitHub, etc.) through the user's existing Chrome browser session.
Prerequisites
- Chrome 144+ installed (check
chrome://version) - Chrome DevTools MCP configured in OpenCode (see Configuration below)
- User logged into target sites in their Chrome browser
Configuration
The MCP server is configured in ~/.config/opencode/opencode.json:
{
"mcp": {
"chrome-devtools": {
"type": "local",
"command": ["npx", "-y", "chrome-devtools-mcp@latest", "--autoConnect"]
}
}
}
Connection Modes
| Mode | Config | When to Use |
|---|---|---|
--autoConnect |
Connects to running Chrome via DevTools discovery | Recommended. Uses existing browser with cookies/sessions. Requires Chrome 144+ and enabling remote debugging in chrome://inspect/#remote-debugging. |
--browserUrl |
--browserUrl http://127.0.0.1:9222 |
When Chrome is launched with --remote-debugging-port=9222. Requires restarting Chrome with the flag. |
| (default) | No flags | Launches a fresh Chrome instance with no cookies, extensions, or password manager. Not suitable for authenticated pages. |
Enabling --autoConnect
- Open Chrome
- Navigate to
chrome://inspect/#remote-debugging - Enable the "Allow remote debugging connections" toggle
- Restart OpenCode so the MCP server reconnects
Using --browserUrl (Alternative)
If --autoConnect doesn't work, restart Chrome with the debugging port:
# Quit Chrome first, then relaunch:
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome \
--remote-debugging-port=9222 \
--user-data-dir="$HOME/Library/Application Support/Google/Chrome"
Update the MCP config:
"command": ["npx", "-y", "chrome-devtools-mcp@latest", "--browserUrl", "http://127.0.0.1:9222"]
Note: On macOS, --remote-debugging-port requires --user-data-dir to be
explicitly set (even if it's the default path). Without it, Chrome prints
"DevTools remote debugging requires a non-default data directory" and the
debugging server does not start.
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.
- 1mo ago First seen · 214 lines · 93 tokens per session scan A 15b2d7655e84
browser-auth is a skill published in the GitHub repository mock-server/mockserver-monorepo (4,999 stars, last pushed today), licensed Apache-2.0. It adds 93 tokens to every session and 1,768 once invoked, about $0.0004 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 2026-08-30.
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