What is library-skills?

A workflow for finding, installing, refreshing, repairing, checking, and managing skills bundled with installed software packages.

Discovering package skills with Library Skills, installing selected skills or all skills, and checking or repairing their links.

It helps when package-provided skills are missing, outdated, broken, or not yet installed.

library-skills — Skill for Claude Code and Codex by tiangolo

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 tiangolo/library-skills --skill tool_skill

Clone the repo

git clone --depth 1 https://github.com/tiangolo/library-skills

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/tiangolo/library-skills/tool_skill.svg)](https://agentmods.dev/skills/tiangolo/library-skills/tool_skill)

Your own site

<a href="https://agentmods.dev/skills/tiangolo/library-skills/tool_skill"><img src="https://agentmods.dev/badge/skills/tiangolo/library-skills/tool_skill.svg" alt="Measured on agentmods" height="20"></a>

Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 603 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. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 18 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium MCP Rug Pull · line 17
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 18
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 19
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 23
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 24
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 25
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 26
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 27
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 28
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 17
uvx/uv tool run commands without ==version create a rug-pull risk.

Fix: Pin the version: uvx package-name==1.2.3
medium MCP Rug Pull · line 18
uvx/uv tool run commands without ==version create a rug-pull risk.

Fix: Pin the version: uvx package-name==1.2.3
medium MCP Rug Pull · line 19
uvx/uv tool run commands without ==version create a rug-pull risk.

Fix: Pin the version: uvx package-name==1.2.3
medium MCP Rug Pull · line 23
uvx/uv tool run commands without ==version create a rug-pull risk.

Fix: Pin the version: uvx package-name==1.2.3
medium MCP Rug Pull · line 24
uvx/uv tool run commands without ==version create a rug-pull risk.

Fix: Pin the version: uvx package-name==1.2.3
medium MCP Rug Pull · line 25
uvx/uv tool run commands without ==version create a rug-pull risk.

Fix: Pin the version: uvx package-name==1.2.3
medium MCP Rug Pull · line 26
uvx/uv tool run commands without ==version create a rug-pull risk.

Fix: Pin the version: uvx package-name==1.2.3
medium MCP Rug Pull · line 27
uvx/uv tool run commands without ==version create a rug-pull risk.

Fix: Pin the version: uvx package-name==1.2.3
medium MCP Rug Pull · line 28
uvx/uv tool run commands without ==version create a rug-pull risk.

Fix: Pin the version: uvx package-name==1.2.3

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00026	$0.00603
Opus 5	$0.00013	$0.00302
Sonnet 5	$0.00005	$0.00121
Haiku 4.5	$0.00003	$0.00060

Measured 8d ago against content hash ea677f1b5e92, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

library-skills 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 8d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (__init__.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

src/library_skills/tool_skill/SKILL.md · 38 lines

How it starts

The opening of the file, as written. The whole thing — 38 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Library Skills

Use this skill when a project might benefit from agent skills bundled by its installed packages, or when existing Library Skills-managed symlinks are stale, broken, orphaned, or need to be checked.

Run commands from the project root.

Agents bundle their own skills by including an .agents/skills directory. More details in Library Skills.

First-Time Setup

Make sure project dependencies are installed first, for example with uv sync for Python projects or npm install / bun install for Node.js projects.
Run uvx library-skills or npx library-skills to discover skills bundled by the installed packages and install selected skills interactively.
Use uvx library-skills --all or npx library-skills --all only when all newly discovered skills should be installed without selecting individual skills.
Use uvx library-skills --tool-skill or npx library-skills --tool-skill to copy this Library Skills tool skill into the project so future agents know how to discover, install, update, repair, and check skills.

Commands

Run uvx library-skills or npx library-skills to discover package-provided skills, install selected new skills, and reconcile existing managed symlinks.
Run uvx library-skills list or npx library-skills list to inspect discovered and installed skills.
Run uvx library-skills list --json or npx library-skills list --json for machine-readable installed status.
Run uvx library-skills scan --json or npx library-skills scan --json for discovery-only automation.
Run uvx library-skills --check or npx library-skills --check to validate managed skill symlink state without changing files.
Run uvx library-skills --yes or npx library-skills --yes to repair stale managed symlinks and remove orphaned managed symlinks non-interactively.
Add --claude when .claude/skills should also be managed.
Add --skill NAME to install a specific discovered skill by name.

Read the full file on GitHub · 38 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

__init__.py 50 B runs code

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.

8d ago First seen · 38 lines · 26 tokens per session scan A ea677f1b5e92

Subscribe to this mod's changes

library-skills is a skill published in the GitHub repository tiangolo/library-skills (789 stars, last pushed 6d ago), licensed MIT. It adds 26 tokens to every session and 603 once invoked, about $0.0001 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 2026-08-30.

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