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/mathews-tom/armory/lightpanda-browsernpx skills add Mathews-Tom/armory --skill lightpanda-browsergit clone --depth 1 https://github.com/Mathews-Tom/armoryWrote 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/mathews-tom/armory/lightpanda-browser)<a href="https://agentmods.dev/skills/mathews-tom/armory/lightpanda-browser"><img src="https://agentmods.dev/badge/skills/mathews-tom/armory/lightpanda-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 | $0.00076 | $0.04078 |
| Opus 5 | $0.00038 | $0.02039 |
| Sonnet 5 | $0.00015 | $0.00816 |
| Haiku 4.5 | $0.00008 | $0.00408 |
Grade C, and why
lightpanda-browser scanned grade C with 2 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 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.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
curl -fsSL https://github.com/nichochar/install-lightpanda/raw/main/install.sh | bash Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fsSL https://github.com/nichochar/install-lightpanda/raw/main/install.sh | bash How it starts
The opening of the file, as written. The whole thing — 454 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Lightpanda Browser — Fast Headless Automation
Headless browser automation using Lightpanda as the backend engine, controlled through the agent-browser CLI via CDP (Chrome DevTools Protocol).
When to use this over agent-browser:
| Use Lightpanda | Use agent-browser (Chromium) |
|---|---|
| Web scraping / data extraction | Screenshots, PDFs, visual testing |
| Form automation / submission | Video recording / visual debugging |
| API response inspection | CSS layout verification |
| DOM traversal / content parsing | Mobile device emulation (iOS) |
| CI environments with limited RAM | Full browser extension support |
| High-volume parallel sessions | Sites requiring full rendering |
Triggers:
- "lightpanda", "lightweight browser", "fast headless"
- "scrape with low memory", "headless scraping"
- "browser without rendering", "DOM-only browser"
- "fast browser automation", "efficient scraping"
- "is lightpanda faster than chromium?", "which headless browser uses less memory?"
- "how do I scrape without chromium?", "can I run a browser with less RAM?"
- Any browser task where visual output is not needed
Prerequisites
Install Lightpanda
# macOS (Apple Silicon)
curl -fsSL https://github.com/nichochar/install-lightpanda/raw/main/install.sh | bash
# Or build from source
git clone https://github.com/lightpanda-io/browser.git
cd browser && zig build -Doptimize=ReleaseSafe
Install agent-browser (if not already present)
brew install agent-browser
Verify installation
lightpanda --version
agent-browser --version
Core Workflow
Every session follows this lifecycle:
1. Start Lightpanda daemon (CDP server)
2. Connect agent-browser via --cdp
3. Navigate, snapshot, interact
4. Stop daemon when done
Step 1 — Start Lightpanda
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.
- 5d ago First seen · 454 lines · 76 tokens per session scan C c92fe7c221ad
lightpanda-browser is a skill published in the GitHub repository Mathews-Tom/armory (316 stars, last pushed 7d ago), licensed MIT. It adds 76 tokens to every session and 4,078 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, 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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