Borrowing it
Nothing to install: this file belongs to swimmwatch/cloakbrowser-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/swimmwatch/cloakbrowser-mcp/main/AGENTS.mdgit clone --depth 1 https://github.com/swimmwatch/cloakbrowser-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/swimmwatch/cloakbrowser-mcp/agents-md)<a href="https://agentmods.dev/instructions/swimmwatch/cloakbrowser-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/swimmwatch/cloakbrowser-mcp/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/swimmwatch/cloakbrowser-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/swimmwatch/cloakbrowser-mcp/agents-md.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.02225 | $0.02225 |
| Opus 5.5 | $0.00890 | $0.00890 |
| Sonnet 5.5 | $0.00445 | $0.00445 |
| Haiku 4.5 | $0.00222 | $0.00222 |
Grade A, and why
cloakbrowser-mcp AGENTS.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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 194 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Repository-specific instructions for AI coding agents working on cloakbrowser-mcp.
Global agent instructions remain authoritative for general communication, research,
tool use, editing, and completion behavior.
Project
cloakbrowser-mcp is a stdio MCP bridge for upstream @playwright/mcp. It starts
Playwright MCP as a child process, injects the CloakBrowser Chromium executable through
a generated config, forwards upstream tools unchanged, and adds two local introspection
tools.
- Runtime: Node.js
^22.13.0 || >=24.0.0, ES modules, strict TypeScript withNodeNext. - Public surface: CLI package only,
bin: cloakbrowser-mcp. - Docker base: pinned official Playwright MCP image from
Dockerfile. - Repository artifacts are written in English unless a localization file requires another language.
Invariants
- Do not copy, rewrite, or mutate upstream Playwright MCP browser tool contracts.
- Local tools are limited to
cloakbrowser_binary_infoandcloakbrowser_bridge_info. PLAYWRIGHT_MCP_*is the primary configuration namespace.CLOAK_PLAYWRIGHT_MCP_*is only for bridge-specific Cloak toggles.- Do not add
CLOAKBROWSER_MCP_*aliases. - Runtime logs never go to
stdout; preserve stdio protocol safety. - Preserve Streamable HTTP session isolation and child-process cleanup.
Layout
src/cli.ts: CLI entry point;src/server.ts: outer MCP proxy.src/bridge/: config, environment, paths, and local tools.src/cli/: options and lifecycle;src/http/: HTTP sessions and transport.src/logging/,src/protocol/,src/runtime/,src/project/: shared runtime support.tests/unit/,tests/integration/,tests/fixtures/: Vitest suites and fake upstream.
Development
Run the smallest relevant checks while developing. Before completion, run:
npm run check
Task-specific commands include npm run test:unit, npm run test:integration,
npm run build, npm run package:verify, npm run docker:build,
npm run docker:smoke, and npm run bridge:compare.
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.
- 10d ago Changed · +30 lines · +361 tokens per session edbf613466c1
- 1mo ago Changed · -52 lines · -718 tokens per session 73ce7d5c3537
- 2mo ago First seen · 216 lines · 2,582 tokens per session scan A 06c9c7ec3f1a
cloakbrowser-mcp AGENTS.md is an instructions file published in the GitHub repository swimmwatch/cloakbrowser-mcp (173 stars, last pushed 5d ago), licensed MIT. It adds 2,225 tokens to every session, about $0.0089 per session on Opus 5.5. 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 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.