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 instructions/gsd-build/gsd-browser/agents-mdgit clone --depth 1 https://github.com/gsd-build/gsd-browserWrote 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/instructions/gsd-build/gsd-browser/agents-md)<a href="https://agentmods.dev/instructions/gsd-build/gsd-browser/agents-md"><img src="https://agentmods.dev/badge/instructions/gsd-build/gsd-browser/agents-md.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 | $0.00204 | $0.00204 |
| Opus 5 | $0.00102 | $0.00102 |
| Sonnet 5 | $0.00041 | $0.00041 |
| Haiku 4.5 | $0.00020 | $0.00020 |
Grade C, and why
gsd-browser AGENTS.md 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 4d 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://install.gsd.build/browser | bash Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fsSL https://install.gsd.build/browser | bash What it actually says
AGENTS.md
gsd-browser
Native Rust browser automation CLI for AI agents. Controls Chrome/Chromium via CDP with a persistent background daemon. Supports navigation, element interaction (click, type, fill), snapshots with versioned refs, assertions, form analysis, structured data extraction, visual regression testing, network mocking, device emulation, auth vault, and prompt injection scanning.
Quick Start
gsd-browser navigate https://example.com
gsd-browser snapshot
gsd-browser click-ref @v1:e1
Installation
curl -fsSL https://install.gsd.build/browser | bash
# or from a repo checkout
cargo install --path cli
Requires Chrome or Chromium. The installer reuses a system browser when present and downloads Chromium automatically where Chrome for Testing is available.
Full Reference
See SKILL.md for complete command reference (63 commands), workflow patterns, configuration, and examples.
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.
- 4d ago First seen · 29 lines · 204 tokens per session scan C 70508b1d2924
gsd-browser AGENTS.md is an instructions file published in the GitHub repository gsd-build/gsd-browser (263 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 204 tokens to every session, about $0.0010 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.
Other instructions, from other repositories
Browser4 CLAUDE.md
Instructions for platonai/Browser4, covering browser4 — project context for claude, architecture, key dispatch chain (cli → browser), batch commands and e2e test structure.
fix-quera AGENTS.md
Instructions for AlirezaKeshavarz83/fix-quera, covering agent guidance, project shape, visual style, quera page data findings and compatibility findings.
fast-browser CLAUDE.md
Claude Code instructions for m4ttstack/fast-browser, covering fast browser plugin, where a change belongs, fork branch: use fast-browser-runtime, releasing a new runtime and re-pinning this repo: use the script.
sendblue-browser-use AGENTS.md
Instructions for sendblue-api/sendblue-browser-use, covering agents.md — sendblue-browser-use, what this repo is, setup, common commands and health (no auth).
browser_oxide AGENTS.md
AGENTS.md instructions for yfedoseev/browser_oxide, covering browseroxide — conventions for ai coding assistants, build & test, architecture, key conventions and where to read more.
shantycrawl-mcp AGENTS.md
AGENTS.md instructions for schlemperdev/shantycrawl-mcp, covering shantycrawl mcp -- dynamic firecrawl mcp server, purpose, ownership, local contracts and work guidance.