003-npm-postinstall

003-npm-postinstall is an agent for coding agents from paulbreuler/limps. It costs 0 tokens per session (341 once invoked), scanned A, original, MIT.

An npm installation hook that automatically copies configured agent skills into selected locations when the limps package is installed.

In plain words
What is it for?
Use it to configure which skills are installed for tools such as Claude, enable or disable automatic installation, and skip it with npm’s --ignore-scripts option.
Why use it?
It removes the manual setup step and handles local or global installs, existing skills, missing directories, configuration errors, and permission problems.

Agent

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 agents/paulbreuler/limps/003-npm-postinstall
Clone the repo
git clone --depth 1 https://github.com/paulbreuler/limps

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 003-npm-postinstall

README.md
[![agentmods](https://agentmods.dev/badge/agents/paulbreuler/limps/003-npm-postinstall.svg)](https://agentmods.dev/agents/paulbreuler/limps/003-npm-postinstall)
Your own site
<a href="https://agentmods.dev/agents/paulbreuler/limps/003-npm-postinstall"><img src="https://agentmods.dev/badge/agents/paulbreuler/limps/003-npm-postinstall.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 341 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 $0.00000 $0.00341
Opus 5 $0.00000 $0.00170
Sonnet 5 $0.00000 $0.00068
Haiku 4.5 $0.00000 $0.00034

Measured 3d ago against content hash b933a33bbc88, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

003-npm-postinstall 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.

plans/0046-limps-skills/agents/003-npm-postinstall.md · 58 lines

What it actually says

Agent 003: npm Postinstall Hook

Objective

Auto-install skills when @sudosandwich/limps is installed via npm.

Tasks

  1. Create install script (scripts/install-skills.ts)

    • Detect global vs local installation
    • Read config from package.json limps.skills
    • Call exporter for configured targets
    • Handle errors gracefully (don't fail install)
  2. Update package.json

    • Add postinstall script
    • Add limps.skills configuration section
    • Document in README
  3. Configuration schema

    {
      "limps": {
        "skills": {
          "autoInstall": true,
          "targets": ["claude"],
          "skills": ["limps-planning"]
        }
      }
    }
    

Acceptance Criteria

  • npm install @sudosandwich/limps auto-installs skills
  • npm install -g @sudosandwich/limps installs to global dirs
  • --ignore-scripts skips auto-install
  • Config can disable auto-install
  • Errors are logged but don't fail installation

Edge Cases

  • No write permission to target directory
  • Skill already exists (skip unless forced)
  • Target directory doesn't exist (create it)
  • Invalid config (use defaults)
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 · 58 lines · 0 tokens per session scan A b933a33bbc88

Subscribe to this mod's changes

003-npm-postinstall is an agent published in the GitHub repository paulbreuler/limps (10 stars, last pushed 6mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 341 tokens. 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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