package-execution

package-execution is a skill for Claude Code from ai-ecoverse/slicc. It costs 75 tokens per session (891 once invoked), scanned A, original, Apache-2.0.

A guide for running JavaScript packages and package.json scripts with npx, ipx, npm run, or related install commands.

In plain words
What is it for?
Use it to run package executables, install packages into a project, run scripts, and deliberately bypass built-in command handling.
Why use it?
It explains when a local package can run, when a package may be installed, and how to handle names that overlap with built-in commands.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Use it to run package executables, install packages into a project, run…

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Install with agentmods
npx agentmods add skills/ai-ecoverse/slicc/package-execution
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 ai-ecoverse/slicc --skill package-execution
Clone the repo
git clone --depth 1 https://github.com/ai-ecoverse/slicc

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.

agentmods badge for package-execution

README.md
[![agentmods](https://agentmods.dev/badge/skills/ai-ecoverse/slicc/package-execution.svg)](https://agentmods.dev/skills/ai-ecoverse/slicc/package-execution)
Your own site
<a href="https://agentmods.dev/skills/ai-ecoverse/slicc/package-execution"><img src="https://agentmods.dev/badge/skills/ai-ecoverse/slicc/package-execution.svg" alt="Measured on agentmods" 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 891 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 $0.00075 $0.00891
Opus 5 $0.00037 $0.00445
Sonnet 5 $0.00015 $0.00178
Haiku 4.5 $0.00007 $0.00089

Measured yesterday against content hash 9922a08b0314, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

package-execution 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 yesterday.

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.

packages/vfs-root/workspace/skills/package-execution/SKILL.md · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

JavaScript package execution

ipx runs package bins from the nearest installed node_modules; npx is an alias with the same behavior. If no local bin or installed package resolves, it normally installs the requested package and runs its bin.

Before that network install, mapped package names that duplicate SLICC built-ins redirect to the built-in instead. The command exits non-zero and prints an actionable stderr hint naming the built-in and suggesting an invocation with the original arguments. The hint may also include an exact ipk add bootstrap; run that bootstrap first when present, then use the suggested built-in.

Prefer the built-in. To deliberately preserve install-and-run behavior for the npm package, put --force before its name:

npx --force <package> [args...]
ipx --force <package> [args...]

Already-installed packages, locally resolved bins, and unmapped package names keep their normal behavior. Use commands to discover available built-ins instead of maintaining a package mapping here.

Installing and removing packages

ipk install <pkg> (also npm install, npm i, ipk add) installs into <cwd>/node_modules and records the package in the nearest package.json. ipk install -g <pkg> installs into the shared global prefix at /shared/lib/node_modules, records direct dependencies in /shared/lib/package.json, and publishes PATH-visible .jsh delegators under /shared/bin for package bins.

ipk install lodash              # local project install
ipk install -g typescript       # global install (shared prefix + PATH bin)
npm uninstall -g typescript     # remove from global manifest and reconcile tree
npm list -g                     # list direct global dependencies
npm root -g                     # print /shared/lib/node_modules

Global bins installed with -g are on the default $PATH via /shared/bin/<name>.jsh delegators — invoke them by bare name from any cwd (delegators run ipx --global <bin> so a same-named local package does not shadow the global install). Local uninstall/list/root work without -g against the cwd package.json.

Read the full file on GitHub · 55 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. yesterday First seen · 55 lines · 75 tokens per session scan A 9922a08b0314

Subscribe to this mod's changes

package-execution is a skill published in the GitHub repository ai-ecoverse/slicc (30 stars, last pushed yesterday), licensed Apache-2.0. It adds 75 tokens to every session and 891 once invoked, about $0.0004 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 2026-09-05.

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