pressure-test

pressure-test is a skill for Claude Code, Codex from melodic-software/claude-code-plugins. It costs 164 tokens per session (2,807 once invoked), scanned A, original, MIT.

A throwaway interactive prototype for trying a business rule, state machine, data model, or API by hand before building the final version. A state machine is a model of allowed states and transitions.

In plain words
What is it for?
Use it to simulate sequences of actions, test state transitions, sanity-check data shapes, and explore an API interactively.
Why use it?
It exposes awkward edge cases and incorrect assumptions while the design is still cheap to change.

Skill for Claude CodeCodex

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the prototype plugin — 2 skills shipped together

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 skills/melodic-software/claude-code-plugins/pressure-test
Any agent
npx skills add melodic-software/claude-code-plugins --skill pressure-test
Clone the repo
git clone --depth 1 https://github.com/melodic-software/claude-code-plugins

Made for: Claude Code, Codex.

Or install prototype, the plugin that ships this one along with the rest of its 2 skills.

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 pressure-test

README.md
[![agentmods](https://agentmods.dev/badge/skills/melodic-software/claude-code-plugins/pressure-test.svg)](https://agentmods.dev/skills/melodic-software/claude-code-plugins/pressure-test)
Your own site
<a href="https://agentmods.dev/skills/melodic-software/claude-code-plugins/pressure-test"><img src="https://agentmods.dev/badge/skills/melodic-software/claude-code-plugins/pressure-test.svg" alt="Measured on agentmods" height="20"></a>
Per session 164 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,807 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 $0.00164 $0.02807
Opus 5 $0.00082 $0.01404
Sonnet 5 $0.00033 $0.00561
Haiku 4.5 $0.00016 $0.00281

Measured yesterday against content hash 7f0775f38dc1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

pressure-test 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.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/detect-ecosystems.sh, scripts/detect-ecosystems.test.sh), 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.

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.

plugins/prototype/skills/pressure-test/SKILL.md · 204 lines

How it starts

The opening of the file, as written. The whole thing — 204 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Pre-computed context

Current branch: !git branch --show-current 2>/dev/null || echo "unknown" Working tree status (empty = clean): !{ git status --porcelain 2>/dev/null || echo "(git status unavailable)"; } | head -10 Project ecosystems: !${CLAUDE_SKILL_DIR}/scripts/detect-ecosystems.sh 2>/dev/null || echo "none detected"

Variables

Arguments: $ARGUMENTS

Purpose

A disposable interactive shell driving a state model by hand, a terminal app by default, a shareable HTML demo when the audience calls for it. Use when the question is about business logic, state transitions, or data shape. Things that look reasonable on paper but only feel wrong once pushed through real cases.

The shared throwaway rules, the auto-invoke gate, and how to capture the answer live in ${CLAUDE_PLUGIN_ROOT}/context/discipline.md. Read it before you start. This file covers only the logic facet.

If the question is "what should this look like". Wrong facet. Invoke /prototype:explore-directions via the Skill tool.

When this is the right shape

  • "Does this state machine handle the edge case where X then Y?"
  • "Does this data model represent the case where...?"
  • "What should the API surface look like before writing it?"
  • Anything where pressing buttons and watching state change reveals the answer

Two shells. TUI default

Two disposable shells can front the same portable logic module (step 3 below), the terminal app (the default) and a self-contained HTML demo. Both run the same process; only the shell swaps. Route by audience:

  • The driver is a developer with a terminal → the TUI (the default below).
  • The driver is a non-developer, a designer, PM, or domain expert pressing the buttons, or no terminal fits the handoff → the HTML demo shell (next section): one file, nothing to install, opened by double-click.
  • Explicit override wins both ways. Ask for a TUI or an HTML demo directly and that beats the default routing.

Read the full file on GitHub · 204 lines

Files

What ships with it

3 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.

  1. yesterday First seen · 204 lines · 164 tokens per session scan A 7f0775f38dc1

Subscribe to this mod's changes

pressure-test is a skill published in the GitHub repository melodic-software/claude-code-plugins (14 stars, last pushed yesterday), licensed MIT. It adds 164 tokens to every session and 2,807 once invoked, about $0.0008 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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