skills-manager

skills-manager is a skill for Claude Code, Codex from trtmn/agent-plugins. It costs 103 tokens per session (743 once invoked), scanned A, original, Unlicense.

A command-line helper for finding, installing, removing, listing, and updating Claude Code skills through the npx skills tool.

In plain words
What is it for?
Use it to search the skill registry, install skills, inspect installed skills, remove them, check for updates, or update them.
Why use it?
It removes the need to remember the separate commands and flags for managing skills at project or user level.

Skill for Claude CodeCodex

Part of the skills-manager plugin — 1 skill shipped together

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.

agentmods
npx agentmods add skills/trtmn/agent-plugins/skills-manager
Any agent
npx skills add trtmn/agent-plugins --skill skills-manager
Clone the repo
git clone --depth 1 https://github.com/trtmn/agent-plugins

Made for: Claude Code, Codex.

Or install skills-manager, 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 skills-manager

README.md
[![agentmods](https://agentmods.dev/badge/skills/trtmn/agent-plugins/skills-manager.svg)](https://agentmods.dev/skills/trtmn/agent-plugins/skills-manager)
Your own site
<a href="https://agentmods.dev/skills/trtmn/agent-plugins/skills-manager"><img src="https://agentmods.dev/badge/skills/trtmn/agent-plugins/skills-manager.svg" alt="Measured on agentmods" height="20"></a>
Per session 103 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 743 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00103 $0.00743
Opus 5 $0.00051 $0.00371
Sonnet 5 $0.00021 $0.00149
Haiku 4.5 $0.00010 $0.00074

Measured 3d ago against content hash 2cc229415464, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

skills-manager 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 3d 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.

plugins/skills-manager/skills/skills-manager/SKILL.md · 82 lines

How it starts

The opening of the file, as written. The whole thing — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skills Manager

You manage skills using the npx skills CLI. Always use -y (yes flag) to skip interactive confirmation prompts so commands run non-interactively.

Commands

Find skills

npx skills find <query>

Returns a list of matching skills with install counts and URLs. Parse the output: skill identifiers look like owner/repo@skill-name.

Install a skill

# Global (user-level, available across all projects) — the default
npx skills add <owner/repo@skill> -g -y

# Project-level (only current directory)
npx skills add <owner/repo@skill> -y

# Install to a specific agent
npx skills add <owner/repo@skill> -g -a claude-code -y

# Install all skills from a repo
npx skills add <owner/repo> --all -g -y

List installed skills

npx skills list -g          # global skills
npx skills list             # project-level skills
npx skills list -g -a claude-code   # filter by agent

Remove a skill

npx skills remove <skill-name> -g -y    # global
npx skills remove <skill-name> -y       # project

Check for updates

npx skills check

Update all skills

npx skills update

Typical workflows

User asks to find and install a skill:

  1. Run npx skills find <relevant query>
  2. Show the user the results (name, install count, URL)
  3. Ask which one they want, or if the best match is obvious, suggest it
  4. Install with npx skills add <identifier> -g -y
  5. Confirm what was installed and where

User asks to remove a skill:

  1. If they named it, run npx skills remove <name> -g -y
  2. If unsure of the exact name, first run npx skills list -g to find it

User asks what skills they have: Run npx skills list -g and present the results clearly.

User asks to update skills:

  1. Run npx skills check to show what's outdated
  2. Run npx skills update to update everything, or ask if they want to be selective

Notes

  • Default to global (-g) install unless the user is clearly working on a project that should have its own skill set
  • The find command output is non-interactive when a query argument is given — it prints results and exits
  • Skill identifiers use the format owner/repo@skill-name (e.g., vercel-labs/agent-skills@commit)
  • After installing a skill, it becomes available in the current session only after restarting Claude Code (let the user know)

Read the full file on GitHub · 82 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. 3d ago First seen · 82 lines · 103 tokens per session scan A 2cc229415464

Subscribe to this mod's changes

skills-manager is a skill published in the GitHub repository trtmn/agent-plugins (2 stars, last pushed 7d ago), licensed Unlicense. It adds 103 tokens to every session and 743 once invoked, about $0.0005 per session on Opus 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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