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Agent skill

Open URL

by mikeyobrien in mikeyobrien/rho

Open URLs, files, and applications on macOS. An agent skill from mikeyobrien/rho.

MITAuto-check passed

Install Open URL

skills CLI
$ npx skills add mikeyobrien/rho --skill open-url -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mikeyobrien/rho open-url --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mikeyobrien/rho.git skills-src && mkdir -p .claude/skills && cp -r skills-src/platforms/macos/skills/open-url .claude/skills/open-url && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
open-url
GitHub stars
373
Token cost
~144 tokens
SKILL.md length
29 words
Files
1
Skills in repo
35
Repo updated
First seen
Licence
MIT

At a glance

Open URLs, files, and applications on macOS. An agent skill from mikeyobrien/rho.

  • Launching browsers
  • SKILL.md covers Open a URL in default browser, Open a file with default app, Open with a specific app and Reveal in Finder, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Opening documents

What it does

Open URL is an agent skill from mikeyobrien/rho. Open URLs, files, and applications on macOS. Use for launching browsers, opening documents, or starting apps.

Its SKILL.md is about 140 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with macOS. The repository describes itself as: An AI agent that stays running, remembers across sessions, and checks in on its own. macOS, Linux, Android. Built on Pi. The licence is MIT.

When your agent uses it

  • Launching browsers
  • Opening documents

Example prompts

  • “/open-url”

What it can do on your machine

Read from SKILL.md and the folder at commit 073a3ee. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Open URL loads about 144 tokens when it runs. Until then it costs about 30 tokens; SKILL.md has 29 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~30
When it runs · the whole SKILL.md, loaded when a task matches
~144

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from mikeyobrien/rho at commit 073a3ee, republished under its MIT licence (© mikeyobrien). 29 words, ~144 tokens.

Download SKILL.mdSave it as .claude/skills/open-url/SKILL.md (or your agent's skills folder).
name
open-url
description
Open URLs, files, and applications on macOS. Use for launching browsers, opening documents, or starting apps.

Open URLs and Files

Open a URL in default browser

bash
open https://example.com

Open a file with default app

bash
open document.pdf
open image.png

Open with a specific app

bash
open -a "Safari" https://example.com
open -a "Visual Studio Code" project/
open -a "Finder" /path/to/directory

Reveal in Finder

bash
open -R /path/to/file

Open a new Finder window

bash
open .

© mikeyobrien, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in platforms/macos/skills/open-url of mikeyobrien/rho.

Open the folder on GitHubat commit 073a3ee

Compare with similar skills

Open URL next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Open URL compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Open URL this skillmikeyobrien/rho373—~144Automated safety check: PassMIT
Site ArchitectureAvdLee/RocketSimApp80511 repos~3.3kAutomated safety check: PassCustom licence
Engine Whats Newflutter/flutter179k—~978Automated safety check: PassBSD-3-Clause
macOS Spm App PackagingDimillian/Skills4k5 repos~1.2kAutomated safety check: PassMIT
Openclaw Live Updateropenclaw/openclaw392k—~3.7kAutomated safety check: PassMIT
Orca iOS Simulator Controlstablyai/orca89k1 repos~584Automated safety check: PassApache-2.0

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  • Site Architecture

    AvdLee/RocketSimApp

    When the user wants to plan, map, or restructure their website's page hierarchy, navigation, URL structure, or internal linking.

    805 GitHub starsUsed in 11 repos~3.3k tokens
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    Generates the "what's new" release summary and diff file for changes in the Flutter engine (//engine/src/flutter) between two releases (e.g., 3.47 vs 3.44).

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  • macOS Spm App Packaging

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    MobileAuto-check passed

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    392k GitHub stars~3.7k tokensUpdated today
    DevOps & CloudAuto-check passed

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  • Open URL

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Works with

Questions about Open URL

What does Open URL do?

Open URLs, files, and applications on macOS. An agent skill from mikeyobrien/rho. Open URL is an agent skill from mikeyobrien/rho. Open URLs, files, and applications on macOS.

When should I use Open URL?

Open URL fits situations like: launching browsers; opening documents.

How do I install Open URL in Claude Code?

Run `npx skills add mikeyobrien/rho --skill open-url -a claude-code`. Or copy the skill folder (platforms/macos/skills/open-url in mikeyobrien/rho) into .claude/skills/open-url in your project. Claude Code loads it when a task matches its description.

How do I install Open URL in Codex?

Run `npx skills add mikeyobrien/rho --skill open-url -a codex`. Or copy the skill folder (platforms/macos/skills/open-url in mikeyobrien/rho) into .agents/skills/open-url in your project. Codex loads it when a task matches its description.

Can I use Open URL in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mikeyobrien/rho --skill open-url -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/open-url, .gemini/skills/open-url, .github/skills/open-url and .opencode/skills/open-url in your project.

What does Open URL need to run?

SKILL.md names no scripts, command-line tools or credentials: Open URL is instructions for the agent only.

Does Open URL access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Open URL safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Open URL use?

Open URL is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Open URL use?

About 144 tokens (SKILL.md is roughly 576 characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Open URL?

Skills that share tags, products or a category with Open URL: Site Architecture (AvdLee/RocketSimApp, 805 stars), Engine Whats New (flutter/flutter, 179k stars), macOS Spm App Packaging (Dimillian/Skills, 4k stars) and Openclaw Live Updater (openclaw/openclaw, 392k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Open URL?

mikeyobrien (a GitHub user) maintains it in mikeyobrien/rho, which has 373 GitHub stars. The repository holds 35 skills in this directory. The repository was last updated on October 1, 2026.

Source: mikeyobrien/rho on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.