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/alibaba/page-agent/agents-mdgit clone --depth 1 https://github.com/alibaba/page-agentWhat 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 | $0.01603 | $0.01603 |
| Opus 5 | $0.00801 | $0.00801 |
| Sonnet 5 | $0.00321 | $0.00321 |
| Haiku 4.5 | $0.00160 | $0.00160 |
Grade A, and why
page-agent 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 — 152 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Instructions for Coding Assistants
Project Overview
This is a monorepo with npm workspaces:
- Page Agent (
packages/page-agent/) - Main entry with built-in UI Panel, published aspage-agenton npm - Extension (
packages/extension/) - Browser extension (WXT + React) - Website (
packages/website/) - React docs and landing page. When working on website, followpackages/website/AGENTS.md
Internal packages:
- Core (
packages/core/) - PageAgentCore without UI (npm:@page-agent/core) - LLMs (
packages/llms/) - LLM client with reflection-before-action mental model - Page Controller (
packages/page-controller/) - DOM operations and visual feedback (SimulatorMask), independent of LLM - UI (
packages/ui/) - Panel and i18n. Decoupled from PageAgent
Development Commands
npm start # Start website dev server
npm run build # Build all packages
npm run build:libs # Build all libraries
npm run build:ext # Build and zip the extension package
npm run typecheck # Typecheck all packages
npm run test # Run unit tests across all workspaces
npm run lint # ESLint
Architecture
Monorepo Structure
Source-first monorepo: library package.json exports point to src/*.ts during development. At publish time, scripts/pre-publish.js promotes publishConfig fields to top-level (swapping to dist/), and scripts/post-publish.js restores the originals.
packages/
├── core/ # npm: "@page-agent/core" ⭐ Core agent logic (headless)
├── page-agent/ # npm: "page-agent" entry class (with UI + controller + demo builds)
├── website/ # @page-agent/website (private)
├── llms/ # @page-agent/llms
├── extension/ # Browser extension
├── page-controller/ # @page-agent/page-controller
└── ui/ # @page-agent/ui
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 · 152 lines · 1,603 tokens per session scan A ee55826aedcf
page-agent AGENTS.md is an instructions file published in the GitHub repository alibaba/page-agent (28,906 stars, last pushed 7d ago), licensed MIT. It adds 1,603 tokens to every session, about $0.0080 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 2026-08-30.
Other instructions, from other repositories
angular AGENTS.md
Instructions for angular/angular, covering environment, key documentation, testing and pull requests.
eve AGENTS.md
Instructions for vercel/eve, covering agents.md, about eve, repository layout, git workflow and commands.
terminal AGENTS.md
Instructions for m4tt72/terminal, covering agents.md - repository guide for agentic coding, project overview, commands, development and testing.
OneJS AGENTS.md
Instructions for Singtaa/OneJS, covering onejs v3: agent guide, requirements, install, project setup and build and live reload.
crust AGENTS.md
Instructions for chenxin-yan/crust, covering tests, documentation, changesets, agent skills and issue tracker.
browser-agent AGENTS.md
Instructions for visnia-ai/browser-agent, covering agents.md, architecture, model and projection contracts, authentication safety and verification and dependencies.