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 niuheilong/stock-mcp-server --skill agent-browser-coregit clone --depth 1 https://github.com/niuheilong/stock-mcp-serverWrote 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/niuheilong/stock-mcp-server/agent-browser-core)<a href="https://agentmods.dev/skills/niuheilong/stock-mcp-server/agent-browser-core"><img src="https://agentmods.dev/badge/skills/niuheilong/stock-mcp-server/agent-browser-core/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/niuheilong/stock-mcp-server/agent-browser-core"><img src="https://agentmods.dev/badge/skills/niuheilong/stock-mcp-server/agent-browser-core.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 | $0.00035 | $0.00419 |
| Opus 5 | $0.00017 | $0.00210 |
| Sonnet 5 | $0.00007 | $0.00084 |
| Haiku 4.5 | $0.00003 | $0.00042 |
Grade A, and why
agent-browser-core 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 10d 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.
What it actually says
Agent Browser Skill (Core)
Purpose
Provide an advanced, production-ready playbook for using agent-browser to automate web tasks via CLI and structured commands.
Best fit
- You need deterministic automation for AI agents.
- You want compact snapshots with refs and JSON output.
- You prefer a fast CLI with Node.js fallback.
Not a fit
- You require a full SDK or custom JS integration.
- You must stream large uploads or complex media workflows.
Quick orientation
- Read
references/agent-browser-overview.mdfor install, architecture, and core concepts. - Read
references/agent-browser-command-map.mdfor command categories and flags. - Read
references/agent-browser-safety.mdfor high-risk controls and safe mode rules. - Read
references/agent-browser-workflows.mdfor recommended AI workflows. - Read
references/agent-browser-troubleshooting.mdfor common issues and fixes.
Required inputs
- Installed agent-browser CLI and browser runtime.
- Target URLs and workflow steps.
- Session or profile strategy if authentication is required.
Expected output
- A clear command sequence and operational guardrails for automation.
Operational notes
- Snapshot early, act via refs, then snapshot again after DOM changes.
- Use
--jsonfor machine parsing and scripting. - Use waits and load-state checks before actions.
- Close tabs or sessions when done to release resources.
Safe mode defaults
- Do not use
eval,--allow-file-access, custom--executable-path, or arbitrary--argswithout explicit approval. - Avoid
network route,set credentials, and cookie/storage mutations unless the task requires it. - Allowlist domains and block localhost or private network targets.
Security notes
- Treat tokens and credentials as secrets.
- Avoid
--allow-file-accessunless explicitly required.
What ships with it
7 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.
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.
- 10d ago First seen · 49 lines · 35 tokens per session scan A 58451246bf42
agent-browser-core is a skill published in the GitHub repository niuheilong/stock-mcp-server (4 stars, last pushed 4mo ago), licensed MIT. It adds 35 tokens to every session and 419 once invoked, about $0.0002 per session on Opus 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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