Borrowing it
Nothing to install: this file belongs to compnew2006/browser-controller. 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/compnew2006/browser-controller/main/AGENTS.mdgit clone --depth 1 https://github.com/compnew2006/browser-controllerWrote 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/compnew2006/browser-controller/agents-md)<a href="https://agentmods.dev/instructions/compnew2006/browser-controller/agents-md"><img src="https://agentmods.dev/badge/instructions/compnew2006/browser-controller/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/compnew2006/browser-controller/agents-md"><img src="https://agentmods.dev/badge/instructions/compnew2006/browser-controller/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 | $0.00679 | $0.00679 |
| Opus 5.5 | $0.00272 | $0.00272 |
| Sonnet 5.5 | $0.00136 | $0.00136 |
| Haiku 4.5 | $0.00068 | $0.00068 |
Grade A, and why
browser-controller 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 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 — 32 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Repository Guidelines
Project Structure
mcp-server/src/holds the TypeScript MCP server, daemon/bridge, tools, and credential vault.extension/is Chrome MV3: background modules wire events;dispatch/routes calls,lib/holds shared state, handlers implement browser behavior.tests/has Vitest suites and Chrome mocks;scripts/has daemon, pairing, and smoke utilities;scripts/pages/has fixtures.agent-config/,specs/,docs/, anddeploy/contain editor setup, feature designs, project/audit docs, and supervisor examples.
Architecture and Security
MCP clients connect to a local daemon that validates calls and routes them over authenticated WebSockets to the paired extension. Keep schemas under mcp-server/src/tools/, registration in register-tools.ts, and browser behavior in matching handlers. Preserve timeouts and tab ownership. Pairing grants trusted clients powerful, unsandboxed browser control. Never commit secrets/private configuration; report vulnerabilities through SECURITY.md. Vault fill never clicks Submit, though site handlers may submit on input.
Build, Test, and Development
npm ciinstalls locked dependencies (Node.js 20+);npm run devwatches TypeScript;npm run buildcompiles tomcp-server/dist/.npm testruns Vitest; focus one withnpm test -- tests/v3-mock.test.ts.- CI runs
npm run lint,npm run typecheck,npm run build,npm run test:coverage,npm run security:audit, andnpm run context:linton Node 20 and 22. npm run smoke:real-chromerequires a built server and enrolled extension; it restarts the daemon and uses the normal Chrome profile.
Style and Testing
Use ES modules, two spaces, semicolons, and nearby naming. Keep tools and handlers focused; Vitest files end in *.test.ts. Add regressions for protocol, tab ownership, timeouts, and credential redaction; prefer isolated tests. Use real-Chrome smoke checks when needed.
Spec Kit, Evidence, and Agent Workflow
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 · 32 lines · 679 tokens per session scan A 8f91420e2501
browser-controller AGENTS.md is an instructions file published in the GitHub repository compnew2006/browser-controller (7 stars, last pushed yesterday), licensed MIT. It adds 679 tokens to every session, about $0.0027 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 2026-10-27.
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).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.