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 Vibe-Marketer/plugins-and-skills --skill dev-browsergit clone --depth 1 https://github.com/Vibe-Marketer/plugins-and-skillsWrote 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/vibe-marketer/plugins-and-skills/dev-browser)<a href="https://agentmods.dev/skills/vibe-marketer/plugins-and-skills/dev-browser"><img src="https://agentmods.dev/badge/skills/vibe-marketer/plugins-and-skills/dev-browser/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/vibe-marketer/plugins-and-skills/dev-browser"><img src="https://agentmods.dev/badge/skills/vibe-marketer/plugins-and-skills/dev-browser.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 | $0.00084 | $0.02095 |
| Opus 5.5 | $0.00034 | $0.00838 |
| Sonnet 5.5 | $0.00017 | $0.00419 |
| Haiku 4.5 | $0.00008 | $0.00210 |
Grade A, and why
dev-browser 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 — 263 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Dev Browser Skill
Browser automation that maintains page state across script executions. Write small, focused scripts to accomplish tasks incrementally. Once you've proven out part of a workflow and there is repeated work to be done, you can write a script to do the repeated work in a single execution.
Choosing Your Approach
- Local/source-available sites: Read the source code first to write selectors directly
- Unknown page layouts: Use
getAISnapshot()to discover elements andselectSnapshotRef()to interact with them - Visual feedback: Take screenshots to see what the user sees
Setup
IMPORTANT: Always use Standalone Mode for browser automation. Extension Mode is rarely needed.
Standalone Mode (Default)
Launches a Chromium browser with a persistent profile. Login sessions, cookies, and local storage persist across browser restarts.
Start the server:
~/.config/amp/skills/dev-browser/server.sh &
Wait for the Ready message before running scripts. Add --headless flag if user requests headless mode.
Key points:
- Profile stored at
~/.config/amp/skills/dev-browser/profiles/browser-data - Once logged in, future sessions remain authenticated
- Use this mode for local dev testing with auth (localhost:3000, etc.)
Extension Mode (Rarely Used)
Connects to user's existing Chrome browser. Only use when explicitly requested - the user must install a browser extension.
cd ~/.config/amp/skills/dev-browser && npm i && npm run start-extension &
Download link: https://github.com/SawyerHood/dev-browser/releases
Writing Scripts
Run all scripts from the dev-browser directory. The
@/import alias requires this directory's config.
Execute scripts inline using heredocs:
cd ~/.config/amp/skills/dev-browser && npx tsx <<'EOF'
import { connect, waitForPageLoad } from "@/client.js";
const client = await connect();
const page = await client.page("example"); // descriptive name like "cnn-homepage"
await page.setViewportSize({ width: 1280, height: 800 });
await page.goto("https://example.com");
await waitForPageLoad(page);
console.log({ title: await page.title(), url: page.url() });
await client.disconnect();
EOF
What ships with it
16 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- bun.lock 46 KB
- package.json 719 B
- references/scraping.md 5.2 KB
- scripts/start-relay.ts 677 B runs code
- scripts/start-server.ts 3.6 KB runs code
- server.sh 521 B runs code
- src/client.ts 30 KB runs code
- src/index.ts 7.9 KB runs code
- src/relay.ts 21 KB runs code
- src/snapshot/__tests__/snapshot.test.ts 5.6 KB runs code
- src/snapshot/browser-script.ts 37 KB runs code
- src/snapshot/index.ts 562 B runs code
- src/snapshot/inject.ts 578 B runs code
- src/types.ts 583 B runs code
- tsconfig.json 844 B
- vitest.config.ts 283 B runs code
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 · 263 lines · 84 tokens per session scan A 1932db4e9fd0
dev-browser is a skill published in the GitHub repository Vibe-Marketer/plugins-and-skills (2 stars, last pushed 7mo ago), licensed MIT. It adds 84 tokens to every session and 2,095 once invoked, about $0.0003 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 2026-08-31.
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