Agent skill

Dutis macOS Handler Manager

Inspects, plans, changes and rolls back macOS default app handlers for file types, MIME types and URL schemes through Dutis, with approval before any write.

No licenceAuto-check passedProductivity & Automation

Install Dutis macOS Handler Manager

skills CLI

$ npx skills add tsonglew/dutis --skill dutis -a claude-code

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

GitHub CLI

$ gh skill install tsonglew/dutis dutis --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/tsonglew/dutis.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/dutis .claude/skills/dutis && 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/

Paste into Claude Code

Install the "dutis" agent skill from https://github.com/tsonglew/dutis/tree/master/skills/dutis into .claude/skills/dutis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dutis", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/tsonglew/dutis/tree/master/skills/dutis

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add tsonglew/dutis --skill dutis -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install tsonglew/dutis dutis --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/tsonglew/dutis.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/dutis .agents/skills/dutis && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "dutis" agent skill from https://github.com/tsonglew/dutis/tree/master/skills/dutis into .agents/skills/dutis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dutis", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add tsonglew/dutis --skill dutis -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install tsonglew/dutis dutis --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/tsonglew/dutis.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/dutis .cursor/skills/dutis && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "dutis" agent skill from https://github.com/tsonglew/dutis/tree/master/skills/dutis into .cursor/skills/dutis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dutis", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/tsonglew/dutis.git --path skills/dutis

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add tsonglew/dutis --skill dutis -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install tsonglew/dutis dutis --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/tsonglew/dutis.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/dutis .gemini/skills/dutis && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "dutis" agent skill from https://github.com/tsonglew/dutis/tree/master/skills/dutis into .gemini/skills/dutis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dutis", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install tsonglew/dutis dutis

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add tsonglew/dutis --skill dutis -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/tsonglew/dutis.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/dutis .github/skills/dutis && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "dutis" agent skill from https://github.com/tsonglew/dutis/tree/master/skills/dutis into .github/skills/dutis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dutis", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add tsonglew/dutis --skill dutis -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install tsonglew/dutis dutis --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/tsonglew/dutis.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/dutis .opencode/skills/dutis && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "dutis" agent skill from https://github.com/tsonglew/dutis/tree/master/skills/dutis into .opencode/skills/dutis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dutis", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: dutis
GitHub stars: 250
Token cost: ~1.2k tokens
SKILL.md length: 653 words
Files: 1
Skills in repo: 1
Repo updated: Oct 5, 2026
First seen: Oct 7, 2026
Licence: None found

At a glance

Inspects, plans, changes and rolls back macOS default app handlers for file types, MIME types and URL schemes through Dutis, with approval before any write.

Works in 7 steps: Start read-only. Check readiness and the… → If the user asks for a general setup or… → Express multi-target changes as version… → …
Changing which app opens a file extension or URL scheme on macOS
Needs DUTIS_HTTP_BEARER_TOKEN
Checking the current default handler for a MIME type or UTI

What it does

The skill keeps Dutis's boundary of inspect, plan, policy check, approval, apply and verify. It starts read-only: check readiness and the effective policy, then use handler get, handler query and handler defaults, or their MCP equivalents, to see current defaults, find apps that explicitly register a kind and role, and read the Launch Services role matrix. Imported or exported UTI definitions count as type evidence, not proof that an app can handle the type.

For vague requests it looks at profiles and recommendations, treating them strictly as proposals. Multi-target changes are written as version 2 TOML, planned afresh and policy-checked, with unresolved selectors or violations stopping the process. You see the exact kinds, identifiers, roles, bundle IDs and plan digest, a dry run comes first, and explicit approval is required right before a write. Event commands for health, pending, replay, archive and purge are covered too, with purge permanent and previewed before --yes.

When your agent uses it

Changing which app opens a file extension or URL scheme on macOS
Checking the current default handler for a MIME type or UTI
Previewing and applying a multi-target handler change safely
Rolling back a handler change that went wrong

Example prompts

“Show me which app currently opens .md files and which other apps could.”
“Make my browser the default for https links, show me the plan and wait for my approval.”
“Roll back the last handler change I applied with Dutis.”

Requirements

macOS with Dutis installed, as a CLI or MCP server

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

Start read-only. Check readiness and the effective policy, then inspect the
If the user asks for a general setup or is unsure which application to use,
Express multi-target changes as version 2 TOML. Build a fresh plan and
Show the user the exact changed kinds, identifiers, roles, target bundle IDs, plan digest,
Ask for explicit approval immediately before a write. Never infer approval
Apply only the reviewed digest, include a meaningful requester identity,
Verify with dutis get, then use dutis audit when the user needs the full

What it can do on your machine

Read from SKILL.md and the folder at commit 249b05f. 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.
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 these keys or tokens, usually read from environment variables:
- DUTIS_HTTP_BEARER_TOKEN
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Dutis macOS Handler Manager loads about 1.2k tokens when it runs. Until then it costs about 41 tokens; SKILL.md has 653 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~41
When it runs · the whole SKILL.md, loaded when a task matches: ~1.2k

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 653 words (~1,245 tokens).

“Use Dutis for macOS Launch Services associations. Preserve its inspect -> plan -> policy check -> approval -> apply -> verify boundary.”

— opening of SKILL.md by tsonglew

name: dutis

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/dutis of tsonglew/dutis.

Open the folder on GitHubat commit 249b05f

Compare with similar skills

Dutis macOS Handler Manager 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.

Dutis macOS Handler Manager compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Dutis macOS Handler Manager this skilltsonglew/dutis	250	—	~1.2k	Automated safety check: Pass	None	5 days ago
CLI Anything SafariHKUDS/CLI-Anything	52k	—	~3.4k	Automated safety check: Pass	Apache-2.0	18 days ago
Altic Studioaltic-dev/altic-mcp	174	—	~3.3k	Automated safety check: Pass	Apache-2.0	2 mo ago
Healthmd CLICodyBontecou/health-md	231	—	~3.9k	Automated safety check: Pass	AGPL-3.0	today
Orchardokooo5km/Skills4U	183	—	~5k	Automated safety check: Warn	MIT	3 days ago
Claude in Chrome MCP Troubleshootingtrailofbits/skills	7.4k	3 repos	~2.6k	Automated safety check: Pass	CC-BY-SA-4.0	2 days ago

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Works with

Questions about Dutis macOS Handler Manager

What does Dutis macOS Handler Manager do?

Inspects, plans, changes and rolls back macOS default app handlers for file types, MIME types and URL schemes through Dutis, with approval before any write. The skill keeps Dutis's boundary of inspect, plan, policy check, approval, apply and verify. It starts read-only: check readiness and the effective policy, then use handler get, handler query and handler defaults, or their MCP equivalents, to see current defaults, find apps that explicitly register a kind and role, and read the Launch Services role matrix.

When should I use Dutis macOS Handler Manager?

Dutis macOS Handler Manager fits situations like: changing which app opens a file extension or URL scheme on macOS; checking the current default handler for a MIME type or UTI; previewing and applying a multi-target handler change safely; rolling back a handler change that went wrong.

How do I install Dutis macOS Handler Manager in Claude Code?

Run `npx skills add tsonglew/dutis --skill dutis -a claude-code`. Or copy the skill folder (skills/dutis in tsonglew/dutis) into .claude/skills/dutis in your project. Claude Code loads it when a task matches its description.

How do I install Dutis macOS Handler Manager in Codex?

Run `npx skills add tsonglew/dutis --skill dutis -a codex`. Or copy the skill folder (skills/dutis in tsonglew/dutis) into .agents/skills/dutis in your project. Codex loads it when a task matches its description.

Can I use Dutis macOS Handler Manager 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 tsonglew/dutis --skill dutis -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/dutis, .gemini/skills/dutis, .github/skills/dutis and .opencode/skills/dutis in your project.

What does Dutis macOS Handler Manager need to run?

Going by SKILL.md and its folder, Dutis macOS Handler Manager needs credentials named DUTIS_HTTP_BEARER_TOKEN. Our summary lists: macOS with Dutis installed, as a CLI or MCP server.

Does Dutis macOS Handler Manager 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 Dutis macOS Handler Manager 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 Dutis macOS Handler Manager use?

No licence was found for Dutis macOS Handler Manager or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Dutis macOS Handler Manager use?

About 1.2k tokens (SKILL.md is roughly 5k 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 Dutis macOS Handler Manager?

Skills that share tags, products or a category with Dutis macOS Handler Manager: CLI Anything Safari (HKUDS/CLI-Anything, 52k stars), Altic Studio (altic-dev/altic-mcp, 174 stars), Healthmd CLI (CodyBontecou/health-md, 231 stars) and Orchard (okooo5km/Skills4U, 183 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Dutis macOS Handler Manager?

tsonglew (a GitHub user) maintains it in tsonglew/dutis, which has 250 GitHub stars. The repository was last updated on October 5, 2026.

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

Install Dutis macOS Handler Manager

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

CLI Anything Safari

Altic Studio

Healthmd CLI

Orchard

Claude in Chrome MCP Troubleshooting

Browser MCP Agent

Related

Questions about Dutis macOS Handler Manager