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/opensource03/harnss/claude-mdgit clone --depth 1 https://github.com/OpenSource03/harnssWhat 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 | $0.16923 | $0.16923 |
| Opus 5 | $0.08461 | $0.08461 |
| Sonnet 5 | $0.03385 | $0.03385 |
| Haiku 4.5 | $0.01692 | $0.01692 |
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 2d 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 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 (requireswebviewTag: truein 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/
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.
- 2d ago First seen · 858 lines · 16,923 tokens per session scan A da5b8ca41d32
harnss CLAUDE.md is an instructions file published in the GitHub repository OpenSource03/harnss (362 stars, last pushed 23d ago), licensed MIT. It adds 16,923 tokens to every session, about $0.0846 per session on Opus 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.
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