What is Ventus CLAUDE.md?

Project instructions for Ventus, a Rust desktop web browser with an AI sidebar. They describe its two-layer web-page display system, key files, layout rules, and application state.

Use them when editing Ventus, especially the layout engine, application state, web views, naming, comments, wording, or inter-process communication.

They give an agent the project-specific rules and architecture needed to make changes without breaking how the browser window and its interface are arranged.

How neura-spheres/Ventus configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to neura-spheres/Ventus. 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/neura-spheres/Ventus/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/neura-spheres/Ventus

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/neura-spheres/ventus/claude-md/github.svg)](https://agentmods.dev/instructions/neura-spheres/ventus/claude-md)

Your own site

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

Per session 3,014 This file is loaded in full into every session.

When invoked 3,014 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	$0.03014	$0.03014
Opus 5	$0.01507	$0.01507
Sonnet 5	$0.00603	$0.00603
Haiku 4.5	$0.00301	$0.00301

Measured 9d ago against content hash 3d799097d0d6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

Ventus 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 9d 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 · 233 lines

How it starts

The opening of the file, as written. The whole thing — 233 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Ventus — Claude Context File

Read RULES.md before writing any code. It defines naming, comments, wording, structure, and IPC conventions for this project. All code must match that style.

Rust desktop browser. Frameless window, Zen Browser-inspired UI, AI sidebar. Stack: WRY 0.38.2, TAO 0.28, WebView2 (Windows), SQLite (rusqlite), Tokio.

Architecture: Two-Layer WebView System

The most critical architectural concept. Two types of WebViews co-exist as Win32 child HWNDs:

Chrome WebView — full-window overlay (0,0,win_w,win_h), always on top via SetWindowPos(HWND_TOP).

Contains all UI: toolbar, sidebar, AI sidebar, settings modal, new-tab page, overlays.
SetWindowRgn clips it to only the UI regions (toolbar strip + sidebar column + optional AI panel).
Outside the clip region: mouse events and painting fall through to the content WebViews below.

Content WebViews — one per tab, positioned below chrome in Z-order.

Rect is (content_x, toolbar_h, content_w, content_h).
In auto-hide-pinned mode: content_x = sidebar_w. In all other modes: content_x = 0.
Managed by build_content_webview() in src/runtime/webviews.rs.

Key constraint: WM_MOUSELEAVE never fires when cursor moves from chrome clip region into content area (content is a sibling HWND, not the chrome's client). The content WebView's mousemove IPC is used instead to signal Rust to close the sidebar.

Single WebView2 environment (critical): The chrome WebView and all normal content tabs (+ popups) share ONE WebContext (content_web_context, profile webview_data). The context is created BEFORE the chrome builder, and chrome attaches via .with_web_context(...). WRY caches the ICoreWebView2Environment on the context and reuses it for every later WebView, so there is a SINGLE msedgewebview2.exe browser process tree (one GPU/network/storage utility set) under ventus.exe. Never build a WebView without a shared WebContext — a context-less WebViewBuilder makes WRY create a second environment (default <exe>.WebView2 dir) = a duplicate process tree in Task Manager. Incognito tabs intentionally use a separate incognito_web_context (ephemeral profile) → their own environment, only while incognito tabs exist. Because chrome shares the env, browser args (DoH, 3p-cookie block) can't be swapped at runtime — TabAction::ApplyWebSecurity relaunches the app (relaunch_self → --wait-for-pid + --restore-session). On exit, close_chrome_controller() runs before shutdown_webview2() so the shared browser process flushes its cookie DB before process::exit().

Read the full file on GitHub · 233 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.

9d ago First seen · 233 lines · 3,014 tokens per session scan A 3d799097d0d6

Subscribe to this mod's changes

Ventus CLAUDE.md is an instructions file published in the GitHub repository neura-spheres/Ventus (2 stars, last pushed 11d ago), licensed MIT. It adds 3,014 tokens to every session, about $0.0151 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 2026-08-31.

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