What is peek AGENTS.md?

A macOS command-line tool and MCP server for inspecting and controlling native application windows. It can read an app’s accessibility tree, find interface elements, interact with them, control menus, take screenshots, and manage app launch and exit.

Use it when developing Peek itself: build it with Swift, run its commands, understand its folder structure, and work with its command-line and MCP interfaces.

It gives coding agents a way to inspect and operate desktop apps instead of working only with files or web pages. The instructions also explain how to build and run the Swift project and manage releases.

How alexmx/peek configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to alexmx/peek. 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/alexmx/peek/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/alexmx/peek

Made for: Codex, OpenCode.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/alexmx/peek/agents-md/github.svg)](https://agentmods.dev/instructions/alexmx/peek/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/alexmx/peek/agents-md"><img src="https://agentmods.dev/badge/instructions/alexmx/peek/agents-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/alexmx/peek/agents-md"><img src="https://agentmods.dev/badge/instructions/alexmx/peek/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,993 This file is loaded in full into every session.

When invoked 2,993 The same file — it is already loaded in full.

Security scan A 0 findings. 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.

Model	Per session	Once invoked
Fable 5.1	$0.02993	$0.02993
Opus 5.5	$0.01197	$0.01197
Sonnet 5.5	$0.00599	$0.00599
Haiku 4.5	$0.00299	$0.00299

Measured 2d ago against content hash 1f2578fa9c42, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

peek AGENTS.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 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.

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.

AGENTS.md · 126 lines

How it starts

The opening of the file, as written. The whole thing — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Peek

What is Peek?

Peek is a macOS CLI tool and MCP server for inspecting and automating native application windows. It provides accessibility tree inspection, element search, UI interaction (click, type, actions), menu bar control, screenshots, and app lifecycle control (launch/quit).

Project Structure

peek/
├── Package.swift                    # SPM manifest (macOS 15+, Swift 6.2)
├── Sources/Peek/
│   ├── Peek.swift                   # @main entry point, registers all subcommands
│   ├── Commands/                    # One file per CLI command
│   ├── Managers/                    # Core business logic (stateless enum singletons)
│   ├── Models/                      # Data types (AXNode, WindowInfo, PeekError, etc.)
│   ├── MCP/
│   │   └── PeekTools.swift          # MCP tool definitions, mirrors CLI 1:1
│   └── Utilities/                   # AX helpers, key mapping, output formatting

Build & Run

swift build
swift run peek <command> [options]

Requirements: macOS 15+, Swift 6.2, Xcode toolchain.

Dependencies:

swift-argument-parser — CLI argument parsing
swift-cli-mcp — MCP server framework

Version Management & Releases

Version Source: .peek-version file in repository root

Single source of truth for version number (e.g., 1.0.0 or dev)
Sources/Peek/Version.swift defines peekVersion constant (defaults to "dev" for local builds)
GitHub Actions reads .peek-version, generates Version.swift with actual version, then builds release binary
CLI exposes version via peek --version

Release Process:

Update .peek-version with new version (e.g., 1.0.0)
Commit and push to main

That's it — pushing a change to .peek-version automatically runs the "Release" workflow (.github/workflows/release.yml; also runnable manually via workflow_dispatch), which:

Creates the git tag and builds the universal binary (skips if the tag already exists)
Publishes the GitHub release
Updates the Homebrew formula in the homebrew-tools repository with the new version and SHA256

Read the full file on GitHub · 126 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.

2d ago Changed · +4 lines · +254 tokens per session 1f2578fa9c42
3d ago Changed · +4 lines · +376 tokens per session ab0f170508ed
4d ago Changed · +133 tokens per session 17022bb152dc
22d ago Changed · +40 tokens per session 39760505941c
2mo ago Changed 0d0406384fa9
2mo ago Changed · +112 tokens per session 26d1d11b38ba
2mo ago First seen · 118 lines · 2,078 tokens per session scan A f2b128c4e8f1

Subscribe to this mod's changes

peek AGENTS.md is an instructions file published in the GitHub repository alexmx/peek (5 stars, last pushed 3d ago), licensed MIT. It adds 2,993 tokens to every session, about $0.0120 per session on Opus 5.5. 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.

ai-agents automation cli macos mcp screenshot

peek AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
peek AGENTS.mdalexmx/peek	Instructions file	5	3d ago	MIT	A	2,993	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

peek: Instructions file for Codex