critical-paths

critical-paths is a skill for Claude Code from ncklrs/claude-chrome-user-testing. It costs 0 tokens per session (1,973 once invoked), scanned A, original, MIT.

A testing guide for critical paths, meaning the user journeys an application must support to remain usable. It describes how to define those journeys, their users, priorities, time limits, and failure behavior.

In plain words
What is it for?
It helps define and test flows such as sign-up, login, purchases, navigation, search, and other essential application tasks.
Why use it?
It focuses testing on failures that would seriously affect core use instead of treating every workflow as equally important.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the user-testing-agent plugin — 14 skills, 10 commands shipped together

Good fit It helps define and test flows such as sign-up, login, purchases, navigation, search, and other essential application tasks.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ncklrs/claude-chrome-user-testing/critical-paths
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 ncklrs/claude-chrome-user-testing --skill critical-paths
Clone the repo
git clone --depth 1 https://github.com/ncklrs/claude-chrome-user-testing

Made for: Claude Code.

Or install user-testing-agent, the plugin that ships this one along with the rest of its 14 skills, 10 commands.

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 critical-paths

README.md
[![agentmods](https://agentmods.dev/badge/skills/ncklrs/claude-chrome-user-testing/critical-paths/github.svg)](https://agentmods.dev/skills/ncklrs/claude-chrome-user-testing/critical-paths)
Your own site
<a href="https://agentmods.dev/skills/ncklrs/claude-chrome-user-testing/critical-paths"><img src="https://agentmods.dev/badge/skills/ncklrs/claude-chrome-user-testing/critical-paths/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.

agentmods 80×15 button for critical-paths

Your own site · 80×15
<a href="https://agentmods.dev/skills/ncklrs/claude-chrome-user-testing/critical-paths"><img src="https://agentmods.dev/badge/skills/ncklrs/claude-chrome-user-testing/critical-paths.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,973 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 $0.00000 $0.01973
Opus 5 $0.00000 $0.00986
Sonnet 5 $0.00000 $0.00395
Haiku 4.5 $0.00000 $0.00197

Measured 10d ago against content hash 915bfbdf2d35, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

critical-paths 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 10d 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.

skills/critical-paths/SKILL.md · 335 lines

How it starts

The opening of the file, as written. The whole thing — 335 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Critical Paths Skill

Test must-work user journeys defined in project configuration. Critical paths are essential flows that must always function correctly.

What is a Critical Path?

A critical path is a user journey that:

  • Must work for the site/app to be usable
  • Represents core business functionality
  • Would cause significant harm if broken
  • Should be tested before every deployment

Examples of Critical Paths

Site Type Critical Paths
E-commerce Purchase flow, Account creation, Cart
SaaS Signup, Login, Core feature usage
Content Navigation, Search, Article viewing
Banking Login, Transfer, Balance check

Path Definition Schema

Full Schema

{
  "paths": [
    {
      "name": "string (required)",
      "description": "string (required)",
      "persona": "persona-id (required)",
      "priority": "critical|high|medium|low (optional, default: high)",
      "timeout": "number in seconds (optional, default: 120)",
      "steps": [
        {
          "action": "navigate|task|verify|wait|input",
          "...action-specific fields"
        }
      ],
      "onFailure": "continue|stop (optional, default: continue)"
    }
  ]
}

Step Actions

navigate

Navigate to a URL path.

{
  "action": "navigate",
  "to": "/path",
  "waitFor": "load|networkidle (optional)"
}
task

Perform a task using the persona's behavior.

{
  "action": "task",
  "do": "description of task to perform",
  "timeout": 30
}
verify

Verify something exists or is true.

// Verify element exists
{ "action": "verify", "element": "description of element" }

// Verify text appears
{ "action": "verify", "text": "exact text to find" }

// Verify URL matches
{ "action": "verify", "url": "/expected-path" }

// Verify URL contains
{ "action": "verify", "urlContains": "confirmation" }
wait

Wait for a condition.

// Wait for seconds
{ "action": "wait", "seconds": 2 }

// Wait for element
{ "action": "wait", "for": "element description" }

// Wait for navigation
{ "action": "wait", "for": "page load" }

Read the full file on GitHub · 335 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. 10d ago First seen · 335 lines · 0 tokens per session scan A 915bfbdf2d35

Subscribe to this mod's changes

critical-paths is a skill published in the GitHub repository ncklrs/claude-chrome-user-testing (19 stars, last pushed 8mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,973 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 2026-08-30.