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/musingfox/cc-plugins/agent-browsernpx skills add musingfox/cc-plugins --skill agent-browsergit clone --depth 1 https://github.com/musingfox/cc-pluginsWhat 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 | $0.00056 | $0.01582 |
| Opus 5 | $0.00028 | $0.00791 |
| Sonnet 5 | $0.00011 | $0.00316 |
| Haiku 4.5 | $0.00006 | $0.00158 |
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 — 147 lines — stays where its author put it; the contents beside it link to each section on GitHub.
agent-browser
Overview
agent-browser is a CLI that gives AI agents direct control over headless browsers. It uses a ref-based interaction model: every interactive element receives a unique reference identifier (@e1, @e2, etc.) derived from the accessibility tree. This enables deterministic, token-efficient browser automation without fragile CSS selectors.
Prerequisites
Ensure agent-browser is installed and the browser binary is available:
# Check installation
agent-browser --version
# Install globally
npm install -g agent-browser
agent-browser install
# On Linux, include system dependencies
agent-browser install --with-deps
Core Workflow: The Ref Cycle
Every browser interaction follows a strict cycle:
open URL → snapshot → read refs → interact → re-snapshot → repeat
- Navigate to the target page with
open - Snapshot to obtain the accessibility tree with refs
- Read the snapshot output — identify target elements by their refs
- Interact with elements using their refs (
click @e1,fill @e2 "text") - Re-snapshot after any action that changes the DOM
Critical rule: Refs are invalidated after navigation or significant DOM changes. Always take a fresh snapshot before interacting with elements after any page change.
Command Quick Reference
| Command | Syntax | Purpose |
|---|---|---|
open |
agent-browser open <url> |
Navigate to URL |
snapshot |
agent-browser snapshot [-i] [-c] [-d N] [-s "sel"] |
Get accessibility tree with refs |
click |
agent-browser click @eN [--new-tab] |
Click element |
dblclick |
agent-browser dblclick @eN |
Double-click element |
fill |
agent-browser fill @eN "text" |
Clear field and type text |
type |
agent-browser type @eN "text" |
Type without clearing |
focus |
agent-browser focus @eN |
Focus element |
select |
agent-browser select @eN "option" |
Select dropdown option |
check |
agent-browser check @eN |
Check checkbox |
uncheck |
agent-browser uncheck @eN |
Uncheck checkbox |
hover |
agent-browser hover @eN |
Hover over element |
press |
agent-browser press <key> |
Press keyboard key |
scroll |
agent-browser scroll <dir> <amount> |
Scroll page |
screenshot |
agent-browser screenshot [--annotate] |
Capture screenshot |
set headers |
agent-browser set headers '{...}' |
Set request headers |
What ships with it
1 file 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.
- yesterday First seen · 147 lines · 56 tokens per session scan A ee5f17106fc9
agent-browser is a skill published in the GitHub repository musingfox/cc-plugins (2 stars, last pushed 2d ago), licensed MIT. It adds 56 tokens to every session and 1,582 once invoked, about $0.0003 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.
Other skills, from other repositories
general-video
Author or edit a custom HyperFrames composition when no specialized workflow fits, or when BRIEF.md sets flow: companion. Use for longer or multi-scene pieces, brand and sizzle reels, montages, static loops, static title cards, footage remixes, and freeform builds. Use motion-graphics instead for a short unnarrated…
use-agent-browser-for-airi
Test AIRI display-model imports with agent-browser across stage-tamagotchi Electron, stage-web, and stage-pocket mobile web layouts. Use when uploading and verifying contributor-supplied Live2D ZIP, VRM, or MMD ZIP/PMX/PMD files through AIRI's model selector, including onboarding bypass, format-specific import…
opencli-sitemap-author
Use when creating or maintaining OpenCLI site sitemaps: agent-facing navigation, page-state, action, workflow, API-reference, pitfall, and fallback knowledge for a website. Use after browser exploration discovers durable site context, when a sitemap is stale, or when promoting local site knowledge into the repo.
debug-optimize-lcp
Guides debugging and optimizing Largest Contentful Paint (LCP) using Chrome DevTools MCP tools. Use this skill whenever the user asks about LCP performance, slow page loads, Core Web Vitals optimization, or wants to understand why their page's main content takes too long to appear. Also use when the user mentions…
pinchtab-mcp
Use this skill when a task requires browser automation through PinchTab's MCP server connected to a remote browser instance. Covers navigation, element interaction, data extraction, form filling, multi-step flows, and session management via MCP tools.
mintlify-preview
Run the public Mintlify product docs site locally for live preview. Use when previewing or iterating on docs under docs/ (.mdx/.md pages, docs.json nav), or when the user says "start the docs", "run mintlify", "preview the docs site".