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.
npx skills add G1Joshi/Agent-Skills --skill npmgit clone --depth 1 https://github.com/G1Joshi/Agent-SkillsWrote 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.
[](https://agentmods.dev/skills/g1joshi/agent-skills/npm)<a href="https://agentmods.dev/skills/g1joshi/agent-skills/npm"><img src="https://agentmods.dev/badge/skills/g1joshi/agent-skills/npm.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00016 | $0.00312 |
| Opus 5 | $0.00008 | $0.00156 |
| Sonnet 5 | $0.00003 | $0.00062 |
| Haiku 4.5 | $0.00002 | $0.00031 |
Grade A, and why
npm 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 5d 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.
What it actually says
npm
npm is the default package manager for Node.js. v11 (2025) introduces strict publishing rules and npx caching improvements.
When to Use
- Default: It comes with Node. Zero friction.
- Compatibility: The standard
package-lock.jsonis supported everywhere. - Publishing:
npm publishis the canonical way to share JS code.
Quick Start
npm init -y
npm install lodash
npm install --save-dev jest
# Monorepo
npm init -w packages/my-lib
Core Concepts
package.json
Manifest file. Scripts, dependencies, metadata.
package-lock.json
Locks dependency tree for reproducible builds. Commit this.
Workspaces
Native monorepo support.
npm install installs dependencies for root and all nested packages.
Best Practices (2025)
Do:
- Use
npm ci: For CI/CD pipelines. Faster and strict (fails if lockfile doesn't match). - Audit:
npm auditto find vulnerabilities. - Use Scopes:
@my-org/my-pkgto avoid name collisions.
Don't:
- Don't mix managers: Don't use
yarnin a repo withpackage-lock.json.
References
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.
- 5d ago First seen · 57 lines · 16 tokens per session scan A f4e31c440b00
npm is a skill published in the GitHub repository G1Joshi/Agent-Skills (12 stars, last pushed 7mo ago), licensed MIT. It adds 16 tokens to every session and 312 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 2026-09-03.
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