---
title: "MCP Screenshot Tool: Capture Any Mac App for Your AI"
description: "Give Claude Code and Cursor eyes on any native Mac app, privately. An on-device MCP screenshot tool with region crops, blur redaction, and a spatial manifest."
date: 2026-06-03
updated: 2026-06-03
canonical: https://screentack.com/blog/mcp-screenshot-tool-capture-any-mac-app
---

# MCP Screenshot Tool: Capture Any Mac App for Your AI

Your AI coding agent can read every file in your repo — but it cannot see your screen. Wire it an **MCP screenshot tool** and that changes: the agent captures what it needs, when it needs it, and reasons over the result. Here is what an MCP screenshot tool is, why "any Mac app" and "on-device" matter, and how to set one up for Claude Code or Cursor.

## What is an MCP screenshot tool?

**MCP (Model Context Protocol)** is the standard that lets an AI agent call external tools directly. An *MCP screenshot tool* exposes screen-capture functions over MCP, so instead of you screenshotting and pasting on every iteration, the agent can:

- list your open windows and capture the right one,
- zoom into a sub-region to read small text,
- run OCR to pull an exact error string,
- and do it again next loop — no courier required.

(For the deeper "why agents are blind" background, see [How to Give Your AI Coding Agent Visual Context](/blog/give-your-ai-coding-agent-visual-context).)

The catch is that not all screenshot-for-AI tools are equal. Three things separate a toy from one you'll actually keep in your loop.

## 1. It has to capture *any* Mac app — not just the browser

A lot of "annotate for AI" tools are browser extensions. They read the page's DOM, which is fine until your bug lives somewhere the browser can't see: a simulator, Xcode, a native app, a generated image, a Spine or Live2D model, a video frame. If the tool can only screenshot a web page, your agent is still blind to most of your screen.

An OS-level MCP screenshot tool captures **any window on macOS**. [Screentack](/) uses macOS's native capture APIs, so "show the agent what's wrong" works the same whether the problem is in a browser tab or a native app you built.

## 2. It has to be private — on-device, with redaction

You're about to send a picture of your screen to an AI. That screen often has other things on it: tokens in a terminal, a customer's name, an unrelated message thread.

Two properties make that safe:

- **On-device capture.** Screentack captures and processes everything locally — nothing is uploaded to a vendor cloud. The image goes to *your* agent, not through someone else's servers.
- **Blur everything you didn't pin.** Screentack's redaction mode Gaussian-blurs the whole screen *except* the regions you marked, before the image is shared. The bug stays sharp; secrets and unrelated windows blur out. (Crops and OCR still run on the sharp originals locally — only what leaves your machine is redacted.)

Local by default, redacted on the way out — that's what makes "screenshot my screen for AI" something you can do without auditing everything else that's visible first.

## 3. It has to send *structured context*, not just an image

Vision models are good, but they're far more reliable when the spatial facts are also written down. A raw pasted image makes the model hunt; a **manifest** hands it a map.

Screentack returns, in one shot: the **full frame** (layout preserved), a **tight crop** of every region you marked (fine detail legible), and a **spatial manifest** — each region's label, normalized position, the window it came from, and per-display coordinates:

```text
## Capture — checkout.app  ·  Display 1 (2560x1600 @2x)
region-1  "wrong accent color"   x:18%  y:32%   crop: region-1.png
region-2  "misaligned button"    x:71%  y:64%   crop: region-2.png
```

Now the agent reasons over `region-2: "misaligned button" at x:71% y:64%`, not "the blue thing near the top." That's the difference between one clean fix and a five-message back-and-forth.

## Set it up for Claude Code or Cursor

Screentack hosts its MCP server locally and registers with a single command:

```bash
claude mcp add --transport http screentack http://127.0.0.1:PORT/mcp
```

Once it's wired in, your agent has a **full set of MCP tools** — capture a window, zoom into a region, run OCR, record a window's changes — and can call them itself, mid-task, without you screenshotting anything.

## One-time purchase

Screentack is a **one-time purchase** — buy it once, it's yours. It's macOS-native, private and on-device by default, and built for exactly this loop: stop narrating your screen to a blind assistant; hand it eyes, a map, and the privacy to use them.

> Want your agent to see your whole Mac — privately? [Download Screentack free](/#waitlist).