What is skills-updater?

A tool for checking installed Claude Code skills for updates and managing skills from different sources. It can also suggest skills to discover and install.

Use it to scan installed skills, check for updates, update individual or multiple skills, and discover additional skills.

It helps you see which installed skills are outdated and keeps skills from multiple installation systems organized.

skills-updater — Skill for Claude Code by myths-labs

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 myths-labs/muse --skill skills-updater

Clone the repo

git clone --depth 1 https://github.com/myths-labs/muse

Made for: Claude Code.

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/myths-labs/muse/skills-updater/github.svg)](https://agentmods.dev/skills/myths-labs/muse/skills-updater)

Your own site

<a href="https://agentmods.dev/skills/myths-labs/muse/skills-updater"><img src="https://agentmods.dev/badge/skills/myths-labs/muse/skills-updater/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/myths-labs/muse/skills-updater"><img src="https://agentmods.dev/badge/skills/myths-labs/muse/skills-updater.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,174 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. 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: 14 findings, up to high

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 →

high Rogue Agent · line 3
Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.

Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
high Rogue Agent · line 279
Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.

Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
high Agent Snooping · line 233
Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.

Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl
medium MCP Rug Pull · line 3
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 37
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 38
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 105
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 107
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 184
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 187
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 190
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 Data Exfiltration · line 223
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
medium Data Exfiltration · line 226
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
medium Data Exfiltration · line 235
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.

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	$0.00075	$0.02174
Opus 5	$0.00037	$0.01087
Sonnet 5	$0.00015	$0.00435
Haiku 4.5	$0.00007	$0.00217

Measured 8d ago against content hash 8762578d24f6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

skills-updater scanned grade A with 1 finding 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 4 executable files (scripts/check_updates.py, scripts/i18n.py, scripts/recommend_skills.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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s "https://raw.githubusercontent.com/<owner>/<repo>/main/.claude-plugin/marketplace.json" | jq '.plugins[] | select(.name == "<skill>") | .version'

skills/toolkit/skills-updater/SKILL.md · 336 lines

How it starts

The opening of the file, as written. The whole thing — 336 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skills Updater

Manage, update, and discover Claude Code skills across multiple installation sources.

Internationalization (i18n)

All scripts automatically detect user locale from environment variables and display output in the appropriate language.

Supported Languages:

English (en) - Default
Chinese (zh) - 中文

Auto-detection order:

LANG environment variable
LC_ALL environment variable
LANGUAGE environment variable
System locale

Manual override:

python scripts/check_updates.py --lang zh  # Force Chinese
python scripts/check_updates.py --lang en  # Force English

Supported Sources

Claude Code Plugins (~/.claude/plugins/):

installed_plugins.json - Tracks installed skills with versions
known_marketplaces.json - Registered marketplace sources
cache/ - Installed skill files

npx skills (~/.skills/ if present):

Skills installed via npx skills add <owner/repo>
Managed by skills.sh infrastructure

Update Check Workflow

Step 1: Scan Installed Skills

python scripts/check_updates.py

Output format:

📦 Installed Skills Status
━━━━━━━━━━━━━━━━━━━━━━━━━━

✅ Up-to-date (12):
   • skill-creator@daymade-skills (1.2.2)
   • github-ops@daymade-skills (1.0.0)
   ...

⬆️ Updates Available (3):
   • planning-with-files@planning-with-files
     Local: 2.5.0 → Remote: 2.6.1
   • superpowers@superpowers-marketplace
     Local: 4.0.3 → Remote: 4.1.0
   ...

⚠️ Unknown Version (2):
   • document-skills@anthropic-agent-skills (unknown)
   ...

Step 2: Confirm Update Strategy

Present options to user:

Update All - Update all skills with available updates
Select Individual - Let user choose specific skills to update
Skip - Cancel the update process

Step 3: Handle Local Modifications

Before updating, check for local modifications:

# Check if local skill has uncommitted changes
cd ~/.claude/plugins/cache/<marketplace>/<skill>/<version>
git status --porcelain

Read the full file on GitHub · 336 lines

Files

What ships with it

8 files 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.

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 · 336 lines · 75 tokens per session scan A 8762578d24f6

Subscribe to this mod's changes

skills-updater is a skill published in the GitHub repository myths-labs/muse (32 stars, last pushed 5d ago), licensed MIT. It adds 75 tokens to every session and 2,174 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Building agents Productivity ai ai-pair-programming claude context-management cursor developer-tools

skills-updater

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Makes network callslowCapability

How it starts

Skills Updater

Internationalization (i18n)

Supported Sources

Update Check Workflow

Step 1: Scan Installed Skills

Step 2: Confirm Update Strategy

Step 3: Handle Local Modifications

What ships with it

What this file has done since we first saw it

Other skills, from other repositories

help-flow

modernization-flow

external-lib-flow

coding-flow

adhoc-flow

coding-agents-prompting-flow