handoff-to-claude-code

handoff-to-claude-code is a skill for Claude Code from asgeirtj/system_prompts_leaks. It costs 12 tokens per session (882 once invoked), scanned A, original, CC0-1.0.

A package of design notes and reference files that explains how a developer should recreate a design in a real codebase. It clarifies that HTML mockups show the intended look and behavior, not production code to copy directly.

In plain words
What is it for?
Use it to hand over a feature design to someone working in React, Vue, SwiftUI, native code, or another project environment.
Why use it?
It gives developers the context, decisions, and implementation guidance needed to turn a design into working software.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter. Also seen: mentions Claude Code.

Good fit Use it to hand over a feature design to someone working in React, Vue, SwiftUI, native code, or another project environment.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/asgeirtj/system_prompts_leaks/handoff-to-claude-code
About the project

System Prompts Leaks is a collection of captured system instructions used to guide AI chatbots and coding agents before they receive user messages. It serves researchers and developers studying how different AI assistants are directed.

asgeirtj/system_prompts_leaks · 64,614 stars · on GitHub

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.

Any agent
npx skills add asgeirtj/system_prompts_leaks --skill handoff-to-claude-code
Clone the repo
git clone --depth 1 https://github.com/asgeirtj/system_prompts_leaks

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 handoff-to-claude-code

README.md
[![agentmods](https://agentmods.dev/badge/skills/asgeirtj/system_prompts_leaks/handoff-to-claude-code/github.svg)](https://agentmods.dev/skills/asgeirtj/system_prompts_leaks/handoff-to-claude-code)
Your own site
<a href="https://agentmods.dev/skills/asgeirtj/system_prompts_leaks/handoff-to-claude-code"><img src="https://agentmods.dev/badge/skills/asgeirtj/system_prompts_leaks/handoff-to-claude-code/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 handoff-to-claude-code

Your own site · 80×15
<a href="https://agentmods.dev/skills/asgeirtj/system_prompts_leaks/handoff-to-claude-code"><img src="https://agentmods.dev/badge/skills/asgeirtj/system_prompts_leaks/handoff-to-claude-code.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 12 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 882 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. ✓ AI security review Fable 5.1 · 6 Sept 2026 📄 Read the review Third-party audits
  • Snyk pass 7 Sept 2026
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00012 $0.00882
Opus 5 $0.00006 $0.00441
Sonnet 5 $0.00002 $0.00176
Haiku 4.5 $0.00001 $0.00088

Measured 11d ago against content hash 96032b8aab2b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

handoff-to-claude-code 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 11d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

Anthropic/claude-design/skills/handoff-to-claude-code/SKILL.md · 90 lines

How it starts

The opening of the file, as written. The whole thing — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Handoff to Claude Code

Create a comprehensive handoff package so a developer using Claude Code can implement this design in a real codebase.

Steps

  1. Create a handoff folder in the project directory:

    mkdir -p <project-folder>/design_handoff_<feature-name>/
    

    Use a descriptive feature name derived from the design (e.g., design_handoff_onboarding_flow, design_handoff_settings_redesign).

  2. Create a README.md in the handoff folder with the following sections:

README.md Structure
# Handoff: <Feature Name>

## Overview
Brief description of what this design is for and what it accomplishes.

## About the Design Files
State clearly that the files in this bundle are **design references created in HTML** — prototypes showing intended look and behavior, not production code to copy directly. Explain that the task is to **recreate these HTML designs in the target codebase's existing environment** (React, Vue, SwiftUI, native, etc.) using its established patterns and libraries — or, if no environment exists yet, to choose the most appropriate framework for the project and implement the designs there.

## Fidelity
State clearly whether the mocks/prototypes created in this conversation are:
- **High-fidelity (hifi)**: Pixel-perfect mockups with final colors, typography, spacing, and interactions. The developer should recreate the UI pixel-perfectly using the codebase's existing libraries and patterns.
- **Low-fidelity (lofi)**: Wireframes or rough layouts showing structure and flow. The developer should use these as a guide for layout and functionality but apply the codebase's existing design system for styling.

## Screens / Views
For each screen or view in the design:
- **Name**: What this screen is called
- **Purpose**: What the user does here
- **Layout**: Detailed description of the layout (grid structure, flex directions, widths, heights, margins, padding)
- **Components**: List each UI component with:
  - Position and size
  - Colors (exact hex values if hifi)
  - Typography (font family, size, weight, line-height, letter-spacing)
  - Border radius, shadows, borders
  - Hover/active/focus states
  - Content/copy (exact text used)

## Interactions & Behavior
- Click handlers and navigation flows
- Animations and transitions (duration, easing, properties)
- Hover states
- Loading states
- Error states
- Form validation rules
- Responsive behavior (if applicable)

## State Management
- What state variables are needed
- State transitions and their triggers
- Any data fetching requirements

## Design Tokens
List all design values used:
- Colors (with hex values)
- Spacing scale
- Typography scale
- Border radius values
- Shadow values

## Assets
List any images, icons, or other assets used in the design and where they came from.

## Files
List the HTML/CSS/JS files in the project that contain the design, so the developer can reference them.

Read the full file on GitHub · 90 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. 11d ago First seen · 90 lines · 12 tokens per session scan A 96032b8aab2b

Subscribe to this mod's changes

handoff-to-claude-code is a skill published in the GitHub repository asgeirtj/system_prompts_leaks (64,614 stars, last pushed yesterday), licensed CC0-1.0. It adds 12 tokens to every session and 882 once invoked, about $0.0001 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.