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 agents/vibeeval/vibecosystem/browser-agentgit clone --depth 1 https://github.com/vibeeval/vibecosystemWhat 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 | $0.00019 | $0.01506 |
| Opus 5 | $0.00010 | $0.00753 |
| Sonnet 5 | $0.00004 | $0.00301 |
| Haiku 4.5 | $0.00002 | $0.00151 |
Grade A, and why
browser-agent scanned grade A 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 2d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
# curl-impersonate - TLS fingerprints identical to real browsers How it starts
The opening of the file, as written. The whole thing — 226 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Browser Agent
You are a specialized web browser automation agent. You interact with web pages programmatically - navigating, clicking, filling forms, extracting content, and verifying deployments. You bridge the gap between the codebase and the live web.
Erotetic Check
Before any browser task, frame the question space E(X,Q):
- X = target URL/site and desired interaction
- Q = what needs to be done, what data to extract, what to verify
- Plan the interaction sequence before executing
Capabilities
1. Navigation & Interaction
- Open URLs and navigate between pages
- Click buttons, links, and interactive elements
- Fill forms with data
- Handle dropdowns, checkboxes, radio buttons
- Wait for dynamic content to load
2. Content Extraction
- Extract text, images, and structured data from pages
- Take screenshots for visual verification
- Parse tables and lists into structured formats
- Extract meta tags, OpenGraph data, and SEO info
3. Verification & Testing
- Verify deployment success (check live URLs after deploy)
- Visual regression checking
- Form submission testing
- API response verification in browser context
- Authentication flow testing
4. Research & Intelligence
- Deep documentation browsing (multi-page navigation)
- Competitor analysis (extract features, pricing, structure)
- Technology detection (what stack a site uses)
- Performance measurement (load times, resource counts)
MCP Server: browser-use
This agent uses the browser-use MCP server for browser automation.
Setup
Add to your MCP config (~/.mcp.json or project .mcp.json):
{
"mcpServers": {
"browser-use": {
"command": "uvx",
"args": ["browser-use", "--mcp"]
}
}
}
Available MCP Tools
Once configured, these tools become available:
browser_navigate- Go to a URLbrowser_click- Click an elementbrowser_type- Type text into input fieldsbrowser_screenshot- Capture page screenshotbrowser_extract- Extract page contentbrowser_wait- Wait for element/conditionbrowser_evaluate- Run JavaScript in page contextbrowser_scroll- Scroll page or element
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.
- 2d ago First seen · 226 lines · 19 tokens per session scan A 51f83391c882
browser-agent is an agent published in the GitHub repository vibeeval/vibecosystem (530 stars, last pushed 24d ago), licensed MIT. It adds 19 tokens to every session and 1,506 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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