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 skills/appautomaton/webmaton/nodriver-browsernpx skills add appautomaton/webmaton --skill nodriver-browsergit clone --depth 1 https://github.com/appautomaton/webmatonWrote 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/appautomaton/webmaton/nodriver-browser)<a href="https://agentmods.dev/skills/appautomaton/webmaton/nodriver-browser"><img src="https://agentmods.dev/badge/skills/appautomaton/webmaton/nodriver-browser.svg" alt="Measured on agentmods" 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 | $0.00106 | $0.04011 |
| Opus 5 | $0.00053 | $0.02005 |
| Sonnet 5 | $0.00021 | $0.00802 |
| Haiku 4.5 | $0.00011 | $0.00401 |
Grade A, and why
nodriver-browser 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 5d 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.
- **A JSON API endpoint** → use `curl` via Bash, you don't need a browser at all How it starts
The opening of the file, as written. The whole thing — 229 lines — stays where its author put it; the contents beside it link to each section on GitHub.
nodriver-browser
A persistent Chrome/Chromium browser that stays alive between Claude's turns. Built on nodriver (CDP-direct, no Selenium, no navigator.webdriver). Every script attaches to the same long-running browser, performs one action, exits — the browser and its tab keep going.
Core invariant: ONE daemon, ONE persistent tab (tabs[0]). Every script reports tabs_open in its output. If you ever see tabs_open > 1, treat it as a real signal that something opened a stray tab — read the warning and act on it.
When to use this skill
- The page needs JavaScript to render (SPA, infinite scroll, lazy load)
- WebFetch is blocked by anti-bot systems (Cloudflare, DataDome, Imperva, hCaptcha)
- The task requires interaction: clicking buttons, filling forms, multi-step flows, dropdown selection
- You need session state across multiple actions (logged-in scraping, multi-page checkout, OAuth flows)
- You need visual proof of a page (screenshot) for debugging or reporting
When NOT to use this skill
- Static HTML that loads fully on first GET → use
WebFetch - One-shot search query → use
WebSearch(or grok-search skill if it exists) - A JSON API endpoint → use
curlvia Bash, you don't need a browser at all - A single quick scrape with no interactivity → consider a one-off Python script, not this skill
This skill spawns a Chromium process (~150-200 MB RAM) that stays alive until you explicitly stop it. Worth it for interactive flows; overkill for one URL.
Quick start
Scripts live in scripts/ next to this SKILL.md — resolve paths relative to the skill root.
Run them directly as executables; the #!/usr/bin/env -S uv run --script
shebang invokes uv and reads the PEP 723 metadata for you. Do not run these
scripts with python, python3, or python -m; that bypasses the shebang,
dependency metadata, and Python version pin. If executable dispatch is
unavailable, use uv run --script scripts/nav.py ....
What ships with it
25 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.
- lib/runner.py 37 KB runs code
- lib/snapshot.py 4.1 KB runs code
- references/constrained-environments.md 850 B
- scripts/back.py 1.1 KB runs code
- scripts/cleanup.py 1.1 KB runs code
- scripts/click.py 2.5 KB runs code
- scripts/close_tab.py 2.3 KB runs code
- scripts/eval.py 1.4 KB runs code
- scripts/forward.py 1.1 KB runs code
- scripts/hover.py 2.7 KB runs code
- scripts/nav.py 1.4 KB runs code
- scripts/press.py 3.0 KB runs code
- scripts/reload.py 1.1 KB runs code
- scripts/screenshot.py 1.6 KB runs code
- scripts/scroll.py 2.1 KB runs code
- scripts/select.py 3.1 KB runs code
- scripts/snapshot.py 1.6 KB runs code
- scripts/start_daemon.py 1.5 KB runs code
- scripts/state.py 1.3 KB runs code
- scripts/status.py 2.7 KB runs code
- scripts/stop_daemon.py 649 B runs code
- scripts/tabs.py 975 B runs code
- scripts/type.py 2.9 KB runs code
- scripts/upload.py 3.0 KB runs code
- scripts/wait.py 2.3 KB 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.
- 5d ago First seen · 229 lines · 106 tokens per session scan A 51a26d5b6f06
nodriver-browser is a skill published in the GitHub repository appautomaton/webmaton (19 stars, last pushed 10d ago), licensed MIT. It adds 106 tokens to every session and 4,011 once invoked, about $0.0005 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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