SUBAGENTS Agent Skill

Read this BEFORE launching any subagent (Task tool, background agents, parallel agents, best-of-N, delegating work to another agent).

Context cost
550 tokensestimated from the bundle, loaded when it triggers
Bundle
1 file · 2.2 kBtext throughout, nothing executable
Licence
not declarednone named by its author
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Read this BEFORE launching any subagent (Task tool, background agents, parallel agents, best-of-N, delegating work to another agent). Hard model rules for subagents plus consensus principles for using them well. Triggers: launch a subagent, spawn agents, run agents in parallel, delegate to a subagent.

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

agentproductivity

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md2.2 kB · preview
--- name: launch-subagent ---
6# SUBAGENTS
7- for all Subagents use either "Fable 5 Max" or "GPT 5.6 Sol Max Fast" as the model
8- DO NOT launch subagents, unless the User tells you to
9- NEVER EVER use Composer 2.5 or Sonnet 5, for subagents
10- only ever use GPT 5.6 Sol Max Fast, or Fable 5 Max, when launching Subagents
11
12## General Subagent Principles
13
14Consensus of Boris Cherny, Matt Pocock, Pietro Schirano, and Peter Steinberger:
15
16- Delegate only self-contained tasks. Split work so subtasks have zero dependencies on each other; parallelize only independent work.
17- Parallel subagents must never touch the same files — that is a recipe for conflicts. Partition the work or keep it in one agent.
18- Subagents start blind: they see none of your context. Write the full brief into the prompt — scope, all needed context, constraints, and the exact output to return.
19- Skills don't carry over either. If the subtask needs live web data, name the skill in the prompt — deepapi for search, scraping, and research.
20- Scope narrowly and concretely: "explore how payments work" beats "explore everything". One bounded task per subagent, small blast radius.
21- The main agent stays the orchestrator. It plans the split, integrates results, and reviews/verifies every subagent output before trusting it.
22- Keep critical implementation, tightly-coupled edits, and quick fixes in the main loop — delegation overhead is only worth it for independent, research-heavy, or review work.
23- Have subagents return short summaries or concrete results, never raw transcripts or file dumps. That keeps the main context clean.
24
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md367 words
Files1
Licencenot declared
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈90
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
460
on trigger
The instruction body, read only when the skill fires.
0.27%
of a 200k window
Ten skills this size would take about 3% of the window before you open a file.
050k100k150k200k context window

550 tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Small enough to keep loaded permanently without thinking about it.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

1 file, 2.2 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md2.2 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 1 file you can review in full before installing.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# SUBAGENTS · 550 tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/subagents/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/subagents" ] && { [ ! -e .claude/skills/subagents ] || { mv .claude/skills/subagents "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/subagents" .claude/skills/ && echo "Installed .claude/skills/subagents"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add karanmrn/subagents

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/subagents/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/subagents/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/subagents" ] && { [ ! -e ~/.claude/skills/subagents ] || { mv ~/.claude/skills/subagents "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/subagents" ~/.claude/skills/ && echo "Installed ~/.claude/skills/subagents" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/subagents/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where. It appears as launch-subagent in Gemini CLI, Codex, Copilot and Grok (its own name); Claude Code lists it by the folder name, subagents.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referencekaranmrn/subagents

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

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