Borrowing it
Nothing to install: this file belongs to opentabs-dev/opentabs. 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/opentabs-dev/opentabs/main/AGENTS.mdgit clone --depth 1 https://github.com/opentabs-dev/opentabsWrote 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/opentabs-dev/opentabs/agents-md)<a href="https://agentmods.dev/instructions/opentabs-dev/opentabs/agents-md"><img src="https://agentmods.dev/badge/instructions/opentabs-dev/opentabs/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/opentabs-dev/opentabs/agents-md"><img src="https://agentmods.dev/badge/instructions/opentabs-dev/opentabs/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 | $0.07070 | $0.07070 |
| Opus 5.5 | $0.02828 | $0.02828 |
| Sonnet 5.5 | $0.01414 | $0.01414 |
| Haiku 4.5 | $0.00707 | $0.00707 |
Grade B, and why
opentabs AGENTS.md scanned grade B 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 1mo 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
ssh pc "sudo systemctl stop ralph-consolidator" # Stop the consolidator Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
**Production code** (`platform/*/src/`): Uses Node.js APIs directly (`node:fs/promises`, `node:child_process`, `node:crypto`, `process.env`, `process.argv`). Copies of this mod
1 near-identical copy found in the catalogue:
- opentabs CLAUDE.md — 88% identical, 66 lines differ
How it starts
The opening of the file, as written. The whole thing — 463 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Project Instructions for Codex
Project Overview
OpenTabs Platform is a Chrome extension + MCP server with a plugin-based architecture. A plugin SDK allows anyone to create OpenTabs plugins as standalone npm packages. The MCP server discovers plugins at runtime, and the Chrome extension dynamically injects plugin adapters into matching tabs — giving AI agents access to web applications through the user's authenticated browser session.
Architecture
┌─────────────┐ Streamable HTTP ┌─────────────┐ WebSocket ┌──────────────────┐
│ Codex │ ←───────────────→ │ MCP Server │ ←─────────→ │ Chrome Extension │
│ │ /mcp │ (localhost) │ │ (Background) │
└─────────────┘ └──────┬──────┘ └────────┬─────────┘
│ │
┌──────▼──────┐ ┌────────▼─────────┐
│ Plugin │ │ Adapter IIFEs │
│ Discovery │ │ (per plugin, │
│ (npm + local│ │ injected into │
│ paths) │ │ matching tabs) │
└─────────────┘ └────────┬─────────┘
│ Same-origin
┌────────▼─────────┐
│ Web APIs │
│ (user's session) │
└──────────────────┘
MCP Server (platform/mcp-server): Plugin discovery, tool dispatch via WebSocket, browser tools, audit log. See platform/mcp-server/AGENTS.md for details.
Chrome Extension (platform/browser-extension): Adapter injection, tool dispatch relay, React side panel UI. Published to npm as @opentabs-dev/browser-extension and bundled as a CLI dependency so opentabs start can auto-install it. See platform/browser-extension/AGENTS.md for details.
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.
- 1mo ago First seen · 463 lines · 7,070 tokens per session scan B b0cac6e4d3ca
opentabs AGENTS.md is an instructions file published in the GitHub repository opentabs-dev/opentabs (999 stars, last pushed 3d ago), licensed MIT. It adds 7,070 tokens to every session, about $0.0283 per session on Opus 5.5. A static security scan graded it B with 2 findings (asks for root, runs shell commands). 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).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.