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Subagent Brief

Category: General  ·  Sub-category: ai-tooling  ·  Last updated:
ai:claudeai:agent
Use BEFORE invoking the Task or Agent tool to spawn a subagent. Anthropic does NOT share prefix cache across subagents — every subagent cold-starts and re-tokenizes its full prompt (system prompt + tool definitions + the context you handed it). Spawning N subagents with full context = N× token cost; a single fan-out can burn an entire Max-plan day. This skill enforces a pre-flight discipline: compress every subagent prompt into a ≤200-word brief before spawning. Triggers when the agent is about to call Task / Agent tool, especially with long files, full repo dumps, or N parallel subagents on similar work.
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From the source SKILL.md

Pre-flight checklist for spawning subagents in Claude Code. The single most expensive mistake in multi-agent workflows is treating subagents as free threads. They are not. Each subagent is an independent LLM call that re-tokenizes the entire prompt you hand it.

What this skill does

Subagent Brief is a community-contributed Claude Code skill in the ai-tooling sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/subagent-brief/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Subagent Brief Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 206,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/subagent-brief
curl -L https://claudskills.com/skills/subagent-brief/SKILL.md \
  -o ~/.claude/skills/subagent-brief/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/subagent-brief/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/subagent-brief/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\subagent-brief\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Subagent Brief Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/subagent-brief/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Subagent Brief skill do?
Use BEFORE invoking the Task or Agent tool to spawn a subagent. Anthropic does NOT share prefix cache across subagents — every subagent cold-starts and re-tokenizes its full prompt (system prompt + tool definitions + the context you handed it). Spawning N subagents with full context = N× token cost; a single fan-out can burn an entire Max-plan day. This skill enforces a pre-flight discipline: compress every subagent prompt into a ≤200-word brief before spawning. Triggers when the agent is about to call Task / Agent tool, especially with long files, full repo dumps, or N parallel subagents on similar work.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Subagent Brief skill?
Use Subagent Brief when your Claude Code task falls under the General category — specifically in the ai tooling area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Subagent Brief" or describe the task and let Claude pick). Browse related skills at /category/general/.
What is a Claude Code skill and how does the Subagent Brief skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Subagent Brief is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
LichAmnesia. (2026). Subagent Brief [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/subagent-brief/
BibTeX
@misc{subagent-brief-2026,
  author    = {LichAmnesia},
  title     = {Subagent Brief [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/subagent-brief/}
}

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