Ready to supercharge your AI agents?

Install any skill in seconds. Free to start, no credit card required.

Get Started Free →

Computer Use · vellum-ai | DecimalAI

agent toolingby vellum-ai

Computer Use

vellum-ai/computer-use

Source vellum-ai/vellum-assistant ↗License MIT

Control the macOS desktop

SkillScore64Maintained

Automatic

AI Engineer pack

Last verified 8/4/2026

What it changes

Passed 10 of 15 test cases with the skill, and 6 of 15 without it.

Without skill41%

With skill64%

Checks it passed that the model alone missed

Specifies the tool prefix as computer_use_.
States that the tools are internally preactivated.
Identifies HostCuProxy as the proxy routing component.

and 3 more in the full report

5 fixed9 passed either way8 still failing0 broke

Pass-rate lift: +23 pp
Tokens: -60%
Agent turns: 0%
Response time: -65%

Model gemini-3.6-flashMeasured 8/4/2026v114 of 22 cases passed with skill · 15 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/vellum-ai-computer-use/SKILL.md https://app.decimal.ai/s/vellum-ai-computer-use/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add vellum-ai-computer-use, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/vellum-ai-computer-use/ and pins it in .decimal/skills.lock

decimalai skills add vellum-ai-computer-use

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/vellum-ai-computer-use/SKILL.md https://app.decimal.ai/s/vellum-ai-computer-use/SKILL.md

Raw file: /s/vellum-ai-computer-use/SKILL.md ↗ · machine-readable summary at /s/vellum-ai-computer-use.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 5 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 5

Prompt

When a chat session opens with a connected macOS desktop client, what is the default activation state of the desktop control action tools?

What was checked, without and with the skill
Checked	Without skill	With skill
States that the tools are internally preactivated.	Missed	Passed

case-05 · gemini-3.6-flash · 8/4/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md7 linessingle file

This skill provides the computer_use_* action tools for controlling the macOS desktop. CU tools run through the main agent loop via HostCuProxy.

The skill is internally preactivated for conversations with a connected desktop client.

Tools in this skill are proxy tools - execution is forwarded to the connected macOS client, never handled locally by the assistant.

Track record

Benchmark

10 / 15

test cases passed, vs 6 / 15 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/1/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

vellum-ai / vellum-assistant

assistant/src/config/bundled-skills/computer-use/SKILL.md

View on GitHub ↗

License MITImported 8/1/2026Version v1

More skills from the same source and nearby in the registry, with their headline benchmark lift.