What is core AGENTS.md?

Project instructions for TideSurf, a TypeScript library and command-line tool that connects Chromium, a browser engine, to coding agents. It explains the architecture for its browser connection, page parser, command interface, SDK, and MCP adapter.

Use it when modifying TideSurf's browser connection, DOM parsing, CLI, SDK, MCP integration, validation, or shared tools.

It gives agents the file structure and component responsibilities needed to make compatible changes.

core AGENTS.md — Instructions file by TideSurf

Install

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.

agentmods

npx agentmods add instructions/tidesurf/core/agents-md

Clone the repo

git clone --depth 1 https://github.com/TideSurf/core

Made for: Codex, OpenCode.

Per session 1,164 This file is loaded in full into every session.

When invoked 1,164 The same file — it is already loaded in full.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.01164	$0.01164
Opus 5	$0.00582	$0.00582
Sonnet 5	$0.00233	$0.00233
Haiku 4.5	$0.00116	$0.00116

Measured yesterday against content hash e4a0391abc1b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

core 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.

AGENTS.md · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

TideSurf Agent Guide

Read this before editing the repo. CLAUDE.md points here so Claude, Codex, and other agents share one source of truth.

Project

TideSurf is a TypeScript library and stateful CLI that connects Chromium to agents. It launches or connects through CDP, compresses the live DOM into token-efficient text, and exposes one shared tool registry through the SDK, CLI, and MCP adapter.

Architecture

src/
  tidesurf.ts              main TideSurf class
  cli.ts                   lightweight CLI and daemon bootstrap
  cli-program.ts           command dispatch and MCP stdio mode
  cli/                     argument parsing, browser controller, session IPC, daemon
  index.ts                 public API exports
  types.ts                 shared CDP, parser, and tool types
  errors.ts                typed error hierarchy
  validation.ts            URL, selector, expression, and element ID validation
  cdp/                     Chrome launch, connection, page, tabs, retries, timeouts
  parser/                  DOM walk, classify, assign IDs, serialize, budget tokens
  tools/                   canonical tool registry and executor
  extensions/              Agent Plugins and Agent Skills loading, discovery, validation
  mcp/                     thin optional-dependency adapter and plugin MCP proxy
website/
  landing/                 TideSurf landing page
  docs/                    TideSurf documentation app

The package root is also a shipped Agent Plugins directory: plugin.json, mcp.json, and skills/ are published so compatible clients can install TideSurf directly.

Commands

Run from the repo root unless a command says otherwise.

bun install
bun run build
bun run typecheck
bun run typecheck:examples
bun run test
bun run test:integration
bun run test:bench
bun run check:docs
bun run build:web:landing
bun run build:web:docs
bun run smoke:pack
bun run verify:release

For local website work, use the package scripts directly:

Read the full file on GitHub · 103 lines

Changes

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 · 103 lines · 1,164 tokens per session scan A e4a0391abc1b

Subscribe to this mod's changes

core AGENTS.md is an instructions file published in the GitHub repository TideSurf/core (21 stars, last pushed 15d ago), licensed Apache-2.0. It adds 1,164 tokens to every session, about $0.0058 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.

Browser automation Languages Planning ai-agents browser-automation browser-use browser-use-agent cdp

core AGENTS.md

Getting it into your agent

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

TideSurf Agent Guide

Project

Architecture

Commands

What this file has done since we first saw it

Other instructions, from other repositories

open-browser-use AGENTS.md

open-browser-use CLAUDE.md

browser-harness CLAUDE.md

terminal AGENTS.md

browser-use CLAUDE.md

obscura AGENTS.md