computer-use

A skill for controlling a computer desktop in the background by clicking, typing, scrolling, and dragging. It is designed to work across macOS, Windows, and Linux without taking control of the user's cursor or keyboard focus.

In plain words
What is it for?
Use it to interact with desktop apps and browsers, including clicking controls, entering text, scrolling pages, and dragging items.
Why use it?
It lets an agent operate desktop applications while the user continues working. The instructions also define a screenshot-first workflow for locating interface controls.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/john-data-chen/hermes-agent-backup/computer-use
Any agent
npx skills add john-data-chen/hermes-agent-backup --skill computer-use
Clone the repo
git clone --depth 1 https://github.com/john-data-chen/hermes-agent-backup

Made for: Claude Code, Codex.

Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,739 The whole file, excluding the scripts and references it only reads on demand.
Security scan F 4 findings. Scan, not verified.
Origin 94% copy Near-identical to another mod 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 $0.00068 $0.02739
Opus 5 $0.00034 $0.01370
Sonnet 5 $0.00014 $0.00548
Haiku 4.5 $0.00007 $0.00274

Measured 2d ago against content hash 33fdce112f14, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade F, and why

computer-use scanned grade F with 4 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

| `blocked pattern in type text` | You tried to `type` a shell command matching the dangerous-pattern block list (`curl ... \| bash`, `sudo rm -rf`, etc.). Break the command up or reconsider |

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

| `blocked pattern in type text` | You tried to `type` a shell command matching the dangerous-pattern block list (`curl ... \| bash`, `sudo rm -rf`, etc.). Break the command up or reconsider |

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

| `blocked pattern in type text` | You tried to `type` a shell command matching the dangerous-pattern block list (`curl ... \| bash`, `sudo rm -rf`, etc.). Break the command up or reconsider |

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

| `blocked pattern in type text` | You tried to `type` a shell command matching the dangerous-pattern block list (`curl ... \| bash`, `sudo rm -rf`, etc.). Break the command up or reconsider |
Origin

This is a copy

94% identical to computer-use — 134 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/computer-use/SKILL.md · 264 lines

How it starts

The opening of the file, as written. The whole thing — 264 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Computer Use (universal, any-model, cross-platform)

You have a computer_use tool that drives the user's desktop in the background — your actions do NOT move the user's cursor, steal keyboard focus, or switch virtual desktops / Spaces. The user can keep typing in their editor while you click around in a browser in another window. This is the opposite of pyautogui-style automation.

Everything here works with any tool-capable model — Claude, GPT, Gemini, or an open model on a local OpenAI-compatible endpoint. There is no Anthropic-native schema to learn.

Hermes drives cua-driver under the hood for the platform plumbing. The Hermes-side computer_use tool exposed in this skill is a higher-level Hermes vocabulary; the raw cua-driver MCP tools (which a different agent harness would see) are NOT what you call — call the computer_use actions documented below.

The canonical workflow

Step 1 — Capture first. Almost every task starts with:

computer_use(action="capture", mode="som", app="<the app you're driving>")

Returns a screenshot with numbered overlays on every interactable element AND an AX-tree index like:

#1  AXButton 'Back' @ (12, 80, 28, 28) [Chrome]
#2  AXTextField 'Address bar' @ (80, 80, 900, 32) [Chrome]
#7  Link 'Sign In' @ (900, 420, 80, 24) [Chrome]
...

The role names match the host platform's accessibility framework (AXButton on macOS, Button on Windows UIA, push button on Linux AT-SPI) — treat them as labels, not as strict types.

Step 2 — Click by element index. This is the single most important habit:

computer_use(action="click", element=7)

Much more reliable than pixel coordinates for every model. Claude was trained on both; other models are often only reliable with indices.

Step 3 — Verify. After any state-changing action, re-capture. You can save a round-trip by asking for the post-action capture inline:

computer_use(action="click", element=7, capture_after=True)

Read the full file on GitHub · 264 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. 2d ago First seen · 264 lines · 68 tokens per session scan F 33fdce112f14

Subscribe to this mod's changes

computer-use is a skill published in the GitHub repository john-data-chen/hermes-agent-backup (2 stars, last pushed 1mo ago), licensed MIT. It adds 68 tokens to every session and 2,739 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it F with 4 findings (asks for root, downloads and executes remote code, recursive force delete). It is 94% identical to computer-use, differing in 134 lines, and is treated as a copy.

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