Borrowing it
Nothing to install: this file belongs to chunlea/screenshot-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/chunlea/screenshot-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/chunlea/screenshot-mcpWrote 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.
[](https://agentmods.dev/instructions/chunlea/screenshot-mcp/claude-md)<a href="https://agentmods.dev/instructions/chunlea/screenshot-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/chunlea/screenshot-mcp/claude-md.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00602 | $0.00602 |
| Opus 5 | $0.00301 | $0.00301 |
| Sonnet 5 | $0.00120 | $0.00120 |
| Haiku 4.5 | $0.00060 | $0.00060 |
Grade A, and why
screenshot-mcp 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Project Overview
screenshot-mcp is both an MCP (Model Context Protocol) server for capturing screenshots and a Claude Code plugin. It enables agents to automate UI testing of native applications by listing windows/displays and capturing screenshots.
Commands
# Install dependencies
bun install
# Run MCP server
bun run start
# Type check
bunx tsc --noEmit
# Test as Claude Code plugin
claude --plugin-dir /path/to/screenshot-mcp
Architecture
MCP Server (src/)
src/
├── index.ts # MCP server entry, registers 5 tools
├── types.ts # TypeScript interfaces (Platform, WindowInfo, DisplayInfo, etc.)
├── tools/ # Tool handlers (one file per tool)
│ ├── list-windows.ts
│ ├── list-displays.ts
│ ├── screenshot-window.ts
│ ├── screenshot-screen.ts
│ └── screenshot-region.ts
├── platform/
│ ├── index.ts # Platform detection, returns Platform interface
│ └── darwin.ts # macOS implementation using JXA (osascript)
└── utils/
└── storage.ts # Screenshot file saving with date-based organization
Claude Code Plugin
.claude-plugin/plugin.json # Plugin manifest
.mcp.json # MCP server configuration
skills/screenshot-testing/ # Screenshot testing guidance skill
Platform Implementation Pattern
Each platform implements the Platform interface from src/types.ts:
listWindows()- List visible windows with IDslistDisplays()- List available displaysscreenshotWindow(windowId)- Capture by window IDscreenshotScreen(displayId?)- Capture displayscreenshotRegion(x, y, width, height)- Capture region
macOS uses JXA (JavaScript for Automation) via osascript -l JavaScript to access CoreGraphics/AppKit APIs. Screenshots use the native screencapture command.
To add Windows/Linux support, create src/platform/win32.ts or src/platform/linux.ts implementing the same interface.
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.
- 8d ago First seen · 78 lines · 602 tokens per session scan A 1b0905350044
screenshot-mcp CLAUDE.md is an instructions file published in the GitHub repository chunlea/screenshot-mcp (1 stars, last pushed 7mo ago), licensed MIT. It adds 602 tokens to every session, about $0.0030 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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