use-agent-supagents

use-agent-supagents is a skill for Claude Code from fmind/agent-supagents. It costs 44 tokens per session (679 once invoked), scanned A, original, MIT.

A workflow for writing one shared subagent description that can be compiled into files for several coding-agent tools.

In plain words
What is it for?
Use it when creating or editing markdown sources in an agents/supagents directory and keeping their generated outputs synchronized.
Why use it?
It avoids maintaining separate copies of the same subagent instructions across Claude Code, Gemini CLI, GitHub Copilot, Cursor, OpenCode, and Kilo Code.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions subagents; mentions Claude Code; mentions Codex.

Part of the agent-supagents plugin — 1 skill shipped together

Good fit Use it when creating or editing markdown sources in an agents/supagents directory and keeping their generated outputs synchronized.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/fmind/agent-supagents/use-agent-supagents
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add fmind/agent-supagents --skill use-agent-supagents
Clone the repo
git clone --depth 1 https://github.com/fmind/agent-supagents

Made for: Claude Code.

Or install agent-supagents, the plugin that ships this one along with the rest of its 1 skill.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for use-agent-supagents

README.md
[![agentmods](https://agentmods.dev/badge/skills/fmind/agent-supagents/use-agent-supagents/github.svg)](https://agentmods.dev/skills/fmind/agent-supagents/use-agent-supagents)
Your own site
<a href="https://agentmods.dev/skills/fmind/agent-supagents/use-agent-supagents"><img src="https://agentmods.dev/badge/skills/fmind/agent-supagents/use-agent-supagents/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for use-agent-supagents

Your own site · 80×15
<a href="https://agentmods.dev/skills/fmind/agent-supagents/use-agent-supagents"><img src="https://agentmods.dev/badge/skills/fmind/agent-supagents/use-agent-supagents.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 679 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00044 $0.00679
Opus 5.5 $0.00018 $0.00272
Sonnet 5.5 $0.00009 $0.00136
Haiku 4.5 $0.00004 $0.00068

Measured 22d ago against content hash b93fe1826325, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

use-agent-supagents scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 22d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/use-agent-supagents/SKILL.md · 35 lines

How it starts

The opening of the file, as written. The whole thing — 35 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Use Supagents

Read compatibility evidence for tested host versions and limits. Read usage and configuration for target paths, precedence, and migration rules. Use Supagents to share role instructions while keeping model, tool, and permission settings explicit for each harness.

Workflow

  1. Inspect existing sources, generated outputs, Git status, and installed harness versions. Preserve handwritten profiles and unrelated work.
  2. Select project (.agents/supagents/) or global (~/.agents/supagents/) scope. Use supagents init NAME --project --target claude --target codex to scaffold selected targets; adapt the target list to the installed hosts.
  3. Write a bounded role: task inputs, responsibilities, allowed actions, handoff format, and stop conditions. Read the relevant host's current documentation before setting native metadata.
  4. Keep shared name and description fields and the Markdown body portable. Put model choices, tool allowlists, permissions, and other host settings in their target blocks. Omit model overrides unless requested or required by the task.
  5. Preview with supagents build --project --diff; inspect warnings and output mappings. For custom layouts pass --source-dir PATH --config FILE consistently.
  6. Generate with supagents build --project --strict; verify expected and obsolete outputs with supagents check --project --strict. Invalid source/configuration, collisions, and unowned outputs must be fixed before generating.
  7. Confirm native discovery in each installed host, then run a bounded runtime task when authorized. Report compilation, discovery, and runtime results separately.

Native formats

  • AGY, CLAUDE, COPILOT, CURSOR, GEMINI, GROK, KILO, and OPENCODE emit Markdown with merged YAML frontmatter.
  • CODEX emits TOML and stores the shared body plus APPEND_BODY as developer_instructions; do not declare that field separately. Supply nonempty name and description strings.
  • OUTPUT overrides a file path. Relative overrides resolve beside the source; configured project directories resolve from the working directory.
  • Custom targets can select format: toml and a body_key; Supagents does not translate native fields or validate complete harness schemas.

Read the full file on GitHub · 35 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 22d ago Changed · -78 lines · -9 tokens per session scan B → A b93fe1826325
  2. 1mo ago First seen · 113 lines · 53 tokens per session scan B d6cc16b6ce1e

Subscribe to this mod's changes

use-agent-supagents is a skill published in the GitHub repository fmind/agent-supagents (6 stars, last pushed yesterday), licensed MIT. It adds 44 tokens to every session and 679 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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