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/the-syntax-slayer/browser-mcp/claude-mdgit clone --depth 1 https://github.com/The-Syntax-Slayer/browser-mcpWrote 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/the-syntax-slayer/browser-mcp/claude-md)<a href="https://agentmods.dev/instructions/the-syntax-slayer/browser-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/the-syntax-slayer/browser-mcp/claude-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 | $0.00193 | $0.00193 |
| Opus 5 | $0.00097 | $0.00097 |
| Sonnet 5 | $0.00039 | $0.00039 |
| Haiku 4.5 | $0.00019 | $0.00019 |
Grade A, and why
browser-mcp CLAUDE.md 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 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.
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.
What it actually says
browser-mcp — Claude Code Guide
Overview
FastMCP 3.2 server for Playwright browser automation — browse, click, screenshot, extract
Entry Points
uv run browser-mcp→browser_mcp.__main__:main
Standards
- FastMCP 3.2+ portmanteau tool pattern — tools use
operationenum param - Responses: structured dicts with
success,message, domain-specific fields - Dual transport: stdio (Claude Desktop) + HTTP (
MCP_TRANSPORT=http) - See mcp-central-docs for fleet-wide coding standards
Key Files
README.md— full documentationpyproject.toml— build config and entry pointsAGENTS.md— OpenAI Codex agent context (if present)
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 · 19 lines · 193 tokens per session scan A 5a8e20a0ff7e
browser-mcp CLAUDE.md is an instructions file published in the GitHub repository The-Syntax-Slayer/browser-mcp (1 stars, last pushed 2mo ago), licensed MIT. It adds 193 tokens to every session, about $0.0010 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 instructions, from other repositories
apitap CLAUDE.md
Instructions for n1byn1kt/apitap, covering claude.md, using apitap as an mcp tool, commands, architecture and module map.
apitap copilot-instructions.md
Instructions for n1byn1kt/apitap, covering copilot instructions for apitap, build and test commands, high-level architecture and key repository conventions.
browserkit AGENTS.md
AGENTS.md instructions for browserkit-dev/browserkit, covering agents.md — workspace memory, project: browserkit, browser lifecycle, browser control and design process preferences.
browserkit CLAUDE.md
Claude Code instructions for browserkit-dev/browserkit, covering browserkit, repo layout, build & test, architecture and external adapter repos (all under browserkit-dev/).
moli AGENTS.md
AGENTS.md instructions for lexmount/moli: Before committing changes that modify Rust source code or Rust build metadata (such as Cargo.toml, Cargo.lock, or rust-toolchain), run all of the following from the repository root and ensure they pass.
flyto-core AGENTS.md
AGENTS.md instructions for flytohub/flyto-core, covering flyto-core agent rules, flyto2 project memory contract, flyto2 frontend quality gate and repo notes.