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 travisjneuman/.claude --skill agent-browsergit clone --depth 1 https://github.com/travisjneuman/.claudeWrote 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/travisjneuman/.claude/agent-browser)<a href="https://agentmods.dev/skills/travisjneuman/.claude/agent-browser"><img src="https://agentmods.dev/badge/skills/travisjneuman/.claude/agent-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/travisjneuman/.claude/agent-browser"><img src="https://agentmods.dev/badge/skills/travisjneuman/.claude/agent-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 | $0.00047 | $0.01205 |
| Opus 5.5 | $0.00019 | $0.00482 |
| Sonnet 5.5 | $0.00009 | $0.00241 |
| Haiku 4.5 | $0.00005 | $0.00120 |
Grade A, and why
agent-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 yesterday.
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 — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Browser
Thin guidance for the managed vercel-labs/agent-browser CLI.
Route first
Browser lane order for all web work:
- The active app's built-in browser (default).
- A managed
agent-browserCLI (this skill). For native desktop apps, useagent-desktopinstead. - Codex Computer Use.
- Claude computer use.
Move down a lane only after recording a concrete current-pass blocker for the lane above; unknown availability is not success, and never silently skip a lane. Playwright (playwright, playwright-core, @playwright/test, Playwright MCP, Playwright browsers), Puppeteer, Selenium/WebDriver, and any standalone browser driven from a shell are prohibited in every lane. CamoFox/Camoufox is retired; never route to it.
If a private owner layer defines a browser rule or an agent-browser runbook, read it before use. It supplies the approved version pin, eligible hosts, dedicated Chrome executable/profile paths, config path, and any SSH aliases; if it is referenced but unavailable, report blocked rather than inventing them. When that layer routes this lane to another host, use only its existing approved SSH alias and remote-invocation form, never run the lane locally on a host it does not approve, and close only task-owned tabs.
Prerequisites and scope
- Keep browser control loopback-only, through existing SSH when remote; do not expose debugging ports on LAN/WAN or add forwarding/services. High-trust reads require exact-account and read-scope approval before access. A read that needed signed-in state but ran without it must be reported as unauthenticated and partial.
- Install or upgrade the CLI/browser only with explicit installation approval, pinned per the owner layer when one exists; missing prerequisites are a blocker. Use only a build that drives Chrome directly: if the installed version depends on
playwright-coreor would download Playwright browsers, stop and report blocked. Do not use an unpinned on-demand download or substitute another runtime, cloud browser, or paid service. - Use the existing dedicated persistent profile directory, never a personal/default or named Chrome profile. Named-profile reuse can copy profile state. Never copy cookies, site storage, or other browser state between engines, profiles, or hosts unless the owner layer names the exact source, target, and procedure; never print or export that state, and do not clear or delete persistent state.
- Use a task-unique
--sessionon every command. Replaceread-20261102-a7f3below with your unique task identifier; never use the default or another task's session. Do not run concurrent sessions against a locked profile; record that blocker without killing another browser or copying its profile.
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.
- yesterday Changed · +5 lines · +16 tokens per session 0f31e689095e
- 3d ago First seen · 50 lines · 31 tokens per session scan A 3b155d7d1256
agent-browser is a skill published in the GitHub repository travisjneuman/.claude (107 stars, last pushed yesterday), licensed MIT. It adds 47 tokens to every session and 1,205 once invoked, about $0.0002 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 2026-11-01.
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