Agent skill

Duel Agents

Configure and use Duel Agents model routing in Claude Code. An agent skill from 2aronS/Duel-Agents.

MITAuto-check: notesAI & LLM Engineering

Install Duel Agents

skills CLI

$ npx skills add 2aronS/Duel-Agents --skill duel-agents -a claude-code

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

GitHub CLI

$ gh skill install 2aronS/Duel-Agents duel-agents --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/2aronS/Duel-Agents.git skills-src && mkdir -p .claude/skills && cp -r skills-src/integrations/claude-plugin/skills/duel-agents .claude/skills/duel-agents && 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 "duel-agents" agent skill from https://github.com/2aronS/Duel-Agents/tree/main/integrations/claude-plugin/skills/duel-agents into .claude/skills/duel-agents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "duel-agents", 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/2aronS/Duel-Agents/tree/main/integrations/claude-plugin/skills/duel-agents

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 2aronS/Duel-Agents --skill duel-agents -a codex

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

GitHub CLI

$ gh skill install 2aronS/Duel-Agents duel-agents --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/2aronS/Duel-Agents.git skills-src && mkdir -p .agents/skills && cp -r skills-src/integrations/claude-plugin/skills/duel-agents .agents/skills/duel-agents && 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 "duel-agents" agent skill from https://github.com/2aronS/Duel-Agents/tree/main/integrations/claude-plugin/skills/duel-agents into .agents/skills/duel-agents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "duel-agents", 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 2aronS/Duel-Agents --skill duel-agents -a cursor

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

GitHub CLI

$ gh skill install 2aronS/Duel-Agents duel-agents --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/2aronS/Duel-Agents.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/integrations/claude-plugin/skills/duel-agents .cursor/skills/duel-agents && 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 "duel-agents" agent skill from https://github.com/2aronS/Duel-Agents/tree/main/integrations/claude-plugin/skills/duel-agents into .cursor/skills/duel-agents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "duel-agents", 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/2aronS/Duel-Agents.git --path integrations/claude-plugin/skills/duel-agents

--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 2aronS/Duel-Agents --skill duel-agents -a gemini-cli

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

GitHub CLI

$ gh skill install 2aronS/Duel-Agents duel-agents --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/2aronS/Duel-Agents.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/integrations/claude-plugin/skills/duel-agents .gemini/skills/duel-agents && 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 "duel-agents" agent skill from https://github.com/2aronS/Duel-Agents/tree/main/integrations/claude-plugin/skills/duel-agents into .gemini/skills/duel-agents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "duel-agents", 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 2aronS/Duel-Agents duel-agents

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 2aronS/Duel-Agents --skill duel-agents -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/2aronS/Duel-Agents.git skills-src && mkdir -p .github/skills && cp -r skills-src/integrations/claude-plugin/skills/duel-agents .github/skills/duel-agents && 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 "duel-agents" agent skill from https://github.com/2aronS/Duel-Agents/tree/main/integrations/claude-plugin/skills/duel-agents into .github/skills/duel-agents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "duel-agents", 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 2aronS/Duel-Agents --skill duel-agents -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 2aronS/Duel-Agents duel-agents --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/2aronS/Duel-Agents.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/integrations/claude-plugin/skills/duel-agents .opencode/skills/duel-agents && 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 "duel-agents" agent skill from https://github.com/2aronS/Duel-Agents/tree/main/integrations/claude-plugin/skills/duel-agents into .opencode/skills/duel-agents/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "duel-agents", 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: duel-agents
GitHub stars: 745
Token cost: ~298 tokens
SKILL.md length: 80 words
Files: 1
Skills in repo: 3
Repo updated: Jun 29, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Configure and use Duel Agents model routing in Claude Code. An agent skill from 2aronS/Duel-Agents.

Works in 4 steps: Subscribe and create an API key at… → Run: npx @duel-agents/install claude-code → Or set manually in ~/.claude/.env → …
Tasks that involve Model routing and gateways
SKILL.md covers Setup, Verify and Build on top
Calls npx; reaches duelagents.com; needs ANTHROPIC_API_KEY and DUEL_API_KEY

What it does

Duel Agents is an agent skill from 2aronS/Duel-Agents. Configure and use Duel Agents model routing in Claude Code. Requires a Duel API key from duelagents.com. Routes all LLM traffic through duelagents.com/v1.

Its SKILL.md is about 300 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in AI & LLM Engineering, covering Model routing and gateways. It works with OpenAI, npm and TypeScript. The repository describes itself as: CLI, SDK, and IDE plugins for Duel Agents. The licence is MIT.

When your agent uses it

Tasks that involve Model routing and gateways

Example prompts

“/duel-agents”

Requirements

Node.js
A credential in ANTHROPIC_API_KEY
A credential in DUEL_API_KEY

Workflow steps

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

Subscribe and create an API key at https://duelagents.com/dashboard/settings
Run: npx @duel-agents/install claude-code
Or set manually in ~/.claude/.env
Restart Claude Code

What it can do on your machine

Read from SKILL.md and the folder at commit c9559e4. 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
Shell commands in SKILL.md call:
- npx
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
- duelagents.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
- ANTHROPIC_API_KEY
- DUEL_API_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Duel Agents loads about 298 tokens when it runs. Until then it costs about 42 tokens; SKILL.md has 80 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~42
When it runs · the whole SKILL.md, loaded when a task matches: ~298

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: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

NoteMentions a .env fileSKILL.md:16
```
3. Or set manually in `~/.claude/.env`:
```

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 2aronS/Duel-Agents at commit c9559e4, republished under its MIT licence (© 2aronS). 80 words, ~298 tokens.

Download SKILL.mdSave it as .claude/skills/duel-agents/SKILL.md (or your agent's skills folder).

name: duel-agents
description: Configure and use Duel Agents model routing in Claude Code. Requires a Duel API key from duelagents.com. Routes all LLM traffic through duelagents.com/v1.

Duel Agents

Duel Agents runs your prompts against multiple models and picks the cheapest answer that still passes quality checks. Every request must use your Duel API key. Never substitute a direct Anthropic or OpenAI key.

Setup

Subscribe and create an API key at https://duelagents.com/dashboard/settings
Run: npx @duel-agents/install claude-code
Or set manually in ~/.claude/.env:

bash

ANTHROPIC_BASE_URL=https://duelagents.com/v1
ANTHROPIC_API_KEY=duel_yourprefix_yoursecret

Restart Claude Code

Verify

bash

npx @duel-agents/install doctor

Build on top

Use @duel-agents/sdk in your own tools. Always pass apiKey from your Duel dashboard.

import { DuelClient } from "@duel-agents/sdk";

const duel = new DuelClient({ apiKey: process.env.DUEL_API_KEY! });
await duel.chat.completions.create({
  model: "duel-auto",
  messages: [{ role: "user", content: "Hello" }],
});

Repository: https://github.com/2aronS/Duel-Agents

Files

Just SKILL.md in integrations/claude-plugin/skills/duel-agents of 2aronS/Duel-Agents.

Open the folder on GitHubat commit c9559e4

Compare with similar skills

Duel Agents 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.

Duel Agents compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Duel Agents this skill2aronS/Duel-Agents	745	—	~298	Automated safety check: Notes	MIT	3 mo ago
Openrouter Hello Worldjeremylongshore/tons-of-skills-marketplace	2.8k	—	~1.8k	Automated safety check: Pass	MIT	today
Openrouter SDK Patternsjeremylongshore/tons-of-skills-marketplace	2.8k	—	~2.9k	Automated safety check: Pass	MIT	today
Page AgentTommy-yw/RunbookHermes	546	3 repos	~2.3k	Automated safety check: Notes	MIT	4 mo ago
9Router AI Gateway Setupdecolua/9router	30k	—	~744	Automated safety check: Pass	MIT	7 days ago
Trigger.dev Agent Patternspapermark/papermark	9.2k	—	~2k	Automated safety check: Pass	Custom licence	1 mo ago

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Questions about Duel Agents

What does Duel Agents do?

Configure and use Duel Agents model routing in Claude Code. An agent skill from 2aronS/Duel-Agents. Duel Agents is an agent skill from 2aronS/Duel-Agents. Configure and use Duel Agents model routing in Claude Code.

When should I use Duel Agents?

Duel Agents fits situations like: tasks that involve Model routing and gateways.

How do I install Duel Agents in Claude Code?

Run `npx skills add 2aronS/Duel-Agents --skill duel-agents -a claude-code`. Or copy the skill folder (integrations/claude-plugin/skills/duel-agents in 2aronS/Duel-Agents) into .claude/skills/duel-agents in your project. Claude Code loads it when a task matches its description.

How do I install Duel Agents in Codex?

Run `npx skills add 2aronS/Duel-Agents --skill duel-agents -a codex`. Or copy the skill folder (integrations/claude-plugin/skills/duel-agents in 2aronS/Duel-Agents) into .agents/skills/duel-agents in your project. Codex loads it when a task matches its description.

Can I use Duel Agents 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 2aronS/Duel-Agents --skill duel-agents -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/duel-agents, .gemini/skills/duel-agents, .github/skills/duel-agents and .opencode/skills/duel-agents in your project.

What does Duel Agents need to run?

Going by SKILL.md and its folder, Duel Agents needs the command-line tools its instructions call (npx) and credentials named ANTHROPIC_API_KEY and DUEL_API_KEY. Our summary lists: Node.js; A credential in ANTHROPIC_API_KEY; A credential in DUEL_API_KEY.

Does Duel Agents access the network?

SKILL.md names 1 domain. In commands or code: duelagents.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Duel Agents safe to install?

Our automated static check of SKILL.md found notes only (mentions a .env file), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Duel Agents use?

Duel Agents 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 Duel Agents use?

About 298 tokens (SKILL.md is roughly 1.2k 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 Duel Agents?

Skills that share tags, products or a category with Duel Agents: Openrouter Hello World (jeremylongshore/tons-of-skills-marketplace, 2.8k stars), Openrouter SDK Patterns (jeremylongshore/tons-of-skills-marketplace, 2.8k stars), Page Agent (Tommy-yw/RunbookHermes, 546 stars) and 9Router AI Gateway Setup (decolua/9router, 30k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Duel Agents?

2aronS (a GitHub user) maintains it in 2aronS/Duel-Agents, which has 745 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on June 29, 2026.

Source: 2aronS/Duel-Agents on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Duel Agents

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

Duel Agents

Setup

Verify

Build on top

Files

Compare with similar skills

Similar skills

More from 2aronS/Duel-Agents

Related

Questions about Duel Agents