What is Hover CLAUDE.md?

Repository instructions for Hover, an MCP server that lets a coding agent control a user’s debugging Chrome and turn recorded actions into Playwright test files. MCP is a standard way for an agent to connect to external tools.

Use it when entering or changing the Hover repository, configuring its Chrome automation, or understanding how recorded browser actions become replayable tests.

It gives agents a clear starting point and explains the project’s boundaries, architecture, and setup instead of making them guess how the repository works.

How Hyperyond/Hover configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Hyperyond/Hover. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Hyperyond/Hover/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/Hyperyond/Hover

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/hyperyond/hover/claude-md/github.svg)](https://agentmods.dev/instructions/hyperyond/hover/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/hyperyond/hover/claude-md"><img src="https://agentmods.dev/badge/instructions/hyperyond/hover/claude-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/hyperyond/hover/claude-md"><img src="https://agentmods.dev/badge/instructions/hyperyond/hover/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 5,049 This file is loaded in full into every session.

When invoked 5,049 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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 5.1	$0.05049	$0.05049
Opus 5.5	$0.02020	$0.02020
Sonnet 5.5	$0.01010	$0.01010
Haiku 4.5	$0.00505	$0.00505

Measured 2mo ago against content hash 8551f0b43f72, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Hover CLAUDE.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 2mo 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.

CLAUDE.md · 190 lines

How it starts

The opening of the file, as written. The whole thing — 190 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Directory guide

This file is the single source of truth for agents entering the Hover repository. Read this file first. It describes the current implementation and the boundaries agents must respect when working in it.

Core documentation index

Product scope and onboarding: README.md.
Architecture and protocols: this file (CLAUDE.md), packages/core/README.md.
License: LICENSE (Apache-2.0).

What Hover is

Hover is an MCP server (@hover-dev/mcp) that the user adds to their own coding agent (Claude Code, Cursor, …). The user's agent drives the user's debug Chrome over CDP through Hover's grounded actuation tools, then crystallizes the session into a plain @playwright/test .spec.ts file under __vibe_tests__/. Hover bundles no AI runtime and manages no model — the calling agent is the intelligence (BYO-CLI). Install globally, then register the bin:

npm i -g @hover-dev/mcp
claude mcp add hover -- hover-mcp

The differentiator vs. Stagehand / Midscene / Playwright codegen is record == replay: grounded actuation means the selector that drove the action IS the one saved, and crystallization is deterministic — a string-template translation of the recorded grounded-step buffer, with no LLM in the codegen path. The saved artifact is plain Playwright that runs in CI with no agent in the loop.

Direction (MCP-first, 2026-06)

Hover pivoted from a VS Code extension that was the engine — a chat that spawned a sandboxed agent plus an in-extension staged engine (host.mjs, a WS client pool, a packed copy of core) — to MCP-first: the engine plugs into the user's own agent over MCP. A standalone interactive TUI that was briefly built has been deleted. The VS Code extension was gutted into a passive review cockpit that drives no agent and ships no engine.

Earlier history (for context only): a pre-extension surface was a dev-server-injected widget shipped via bundler plugins (vite-plugin-hover, @hover-dev/astro / nuxt / next, webpack-plugin-hover, @hover-dev/cli, @hover-dev/widget-bootstrap, @hover-dev/transform-source). All of those were removed long ago; their source is gone and only git history retains it.

Read the full file on GitHub · 190 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.

2mo ago First seen · 190 lines · 5,049 tokens per session scan A 8551f0b43f72

Subscribe to this mod's changes

Hover CLAUDE.md is an instructions file published in the GitHub repository Hyperyond/Hover (11 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 5,049 tokens to every session, about $0.0202 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.

Browser automation Debugging agent ai browser-automation chrome-devtools-protocol claude developer-tools

Hover CLAUDE.md next to 6 instructions from other repositories
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Hover: Instructions file for Claude Code