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harnss: Instructions file for Claude Code

CLAUDE.md

harnss CLAUDE.md is an instructions file for Claude Code from OpenSource03/harnss. It costs 16,923 tokens per session, scanned A, original, MIT.

A project instruction file for Harnss, an open-source desktop client for the Agent Client Protocol. It documents the project's technology choices, structure, and architecture.

In plain words
What is it for?
Use it when working on Harnss, including its Electron desktop application, React interface, TypeScript code, tests, styling, and agent-session features.
Why use it?
It gives coding agents the project-specific context needed to work consistently in a codebase they do not already know.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: reads .claude/ paths; mentions subagents; names the SlashCommand tool.

This is OpenSource03/harnss's own configuration. It tells Claude Code how to work on harnss itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything harnss configures →

not rated 392repo +2 7d ago A scan 16,923 tokens original MIT
View source ↗ OpenSource03/harnss harnss.app
Reuse

Borrowing it

Nothing to install: this file belongs to OpenSource03/harnss. 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/OpenSource03/harnss/master/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/OpenSource03/harnss

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.

agentmods badge for harnss CLAUDE.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/opensource03/harnss/claude-md"><img src="https://agentmods.dev/badge/instructions/opensource03/harnss/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.

agentmods 80×15 button for harnss CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/opensource03/harnss/claude-md"><img src="https://agentmods.dev/badge/instructions/opensource03/harnss/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 16,923 This file is loaded in full into every session.
When invoked 16,923 The same file — it is already loaded in full.
Security scan A 1 finding. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.16923 $0.16923
Opus 5.5 $0.06769 $0.06769
Sonnet 5.5 $0.03385 $0.03385
Haiku 4.5 $0.01692 $0.01692

Measured 1mo ago against content hash da5b8ca41d32, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

harnss CLAUDE.md scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- `git:push(cwd)` / `git:pull(cwd)` / `git:fetch(cwd)` — remote sync
CLAUDE.md · 858 lines

How it starts

The opening of the file, as written. The whole thing — 858 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Harnss

Open-source desktop client for the Agent Client Protocol. Uses the @anthropic-ai/claude-agent-sdk to programmatically manage Claude sessions via query(). Supports multiple concurrent sessions with persistent chat history, project workspaces, background agents, tool permissions, and context compaction.

Tech Stack

  • Runtime: Electron 40 (main process) + React 19 (renderer)
  • Build: Vite 7, TypeScript 5.9, tsup (electron TS→JS), electron-builder (cross-platform packaging)
  • Testing: vitest (unit tests for hooks, lib utilities, and electron modules; config: vitest.config.electron.ts)
  • Styling: Tailwind CSS v4 + ShadCN UI (includes Preflight — no CSS resets needed)
  • UI Components: ShadCN (Button, Badge, ScrollArea, Tooltip, Collapsible, Separator, DropdownMenu, Avatar)
  • Icons: lucide-react
  • Markdown: react-markdown + remark-gfm + react-syntax-highlighter + @tailwindcss/typography
  • Diff: diff (word-level diff rendering)
  • Glass effect: electron-liquid-glass (macOS Tahoe+ transparency)
  • Claude SDK: @anthropic-ai/claude-agent-sdk (ESM-only, async-imported from CommonJS)
  • ACP SDK: @agentclientprotocol/sdk (Agent Client Protocol client — ACP sessions use ClientSideConnection)
  • Terminal: node-pty (main process) + @xterm/xterm + @xterm/addon-fit (renderer)
  • Browser: Electron <webview> tag (requires webviewTag: true in webPreferences)
  • Virtualization: @tanstack/react-virtual (chat message windowing)
  • State management: zustand (settings store, localStorage wrapper)
  • Animation: motion (v12, formerly framer-motion)
  • Canvas/Annotations: react-konva + konva (image annotation editor)
  • Diagrams: mermaid (MermaidDiagram.tsx)
  • Code editor: @monaco-editor/react (Monaco VS Code editor integration)
  • Voice: @huggingface/transformers (Whisper speech-to-text, lazy-loaded)
  • Notifications: sonner (toast notifications)
  • MCP protocol: @modelcontextprotocol/sdk (MCP client SDK for server integration)
  • HTML sanitization: dompurify (sanitize HTML before rendering)
  • Syntax highlighting: refractor (Prism via refractor, used by syntax-highlight.tsx)
  • Context menus: electron-context-menu (right-click context menus in Electron)
  • Auto-updater: electron-updater (managed binary auto-update infrastructure)
  • UI primitives: radix-ui (direct Radix primitive usage, separate from ShadCN)
  • Package manager: pnpm
  • Path aliases: @/ → ./src/, @shared/ → ./shared/

Read the full file on GitHub · 858 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.

  1. 1mo ago First seen · 858 lines · 16,923 tokens per session scan A da5b8ca41d32

Subscribe to this mod's changes

harnss CLAUDE.md is an instructions file published in the GitHub repository OpenSource03/harnss (392 stars, last pushed 7d ago), licensed MIT. It adds 16,923 tokens to every session, about $0.0677 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Claude Codeagent-client-protocolagentclientprotocolaichatgptclaude
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