test

A command that checks and explores a Z specification with probcli, the command-line interface for ProB, a tool that validates formal models and examines possible system states.

In plain words
What is it for?
Use it to find a specification file, run its checks, perform model checking, and animate a fixed sequence of operations; it also supports Z files and B machines.
Why use it?
It can reveal invalid specifications and state or operation problems before implementation testing.

Command

Part of the z-spec-dev plugin — 42 commands, 1 hook 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 commands/punt-labs/z-spec/test
Clone the repo
git clone --depth 1 https://github.com/punt-labs/z-spec

Or install z-spec-dev, the plugin that ships this one along with the rest of its 42 commands, 1 hook.

Per session 9 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 920 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 89% copy Near-identical to another mod 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 $0.00009 $0.00920
Opus 5 $0.00005 $0.00460
Sonnet 5 $0.00002 $0.00184
Haiku 4.5 $0.00001 $0.00092

Measured 3d ago against content hash 56f170296154, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 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.

Origin

This is a copy

89% identical to test-dev — 6 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugin/commands/test.md · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Test Z Specification with ProB

Validate and animate a Z specification using probcli (ProB command line interface).

Input

Arguments: $ARGUMENTS

Parse arguments:

  • First positional argument: file path (or search in docs/)
  • -v or --verbose: Append each check's detail field to its summary line. Without -v, render only <name>: <status>; with -v, render <name>: <status> — <detail> (display only — the tool returns structured JSON, not raw probcli stdout, so there is no raw output to surface)
  • -s N or --setsize N: Default set size for model checking (default: 2)

-a and -v are not parameters of the test tool. run_full_suite animates a fixed 20 steps internally — custom step counts are the separate animate capability. The tool's max_ops (default 1000) bounds model-checking only, and stays at the default; -v merely changes how this command renders the returned JSON.

Process

1. Locate the Specification

If a file path is provided, use it directly. If no file specified, look in docs/ for .tex files.

2. Verify

Call mcp__plugin_z-spec_zspec__test with file, plus setsize from -s. Leave max_ops and timeout at the tool defaults — they are not wired to flags. -v is the verbose flag (see step 3), not a tool argument.

The tool runs the five checks — parse-and-init, animation, CBC assertions, CBC deadlock, model check — and returns:

{timestamp, probcli_version, setsize, ok, states_analysed,
 transitions_fired, checks:[{name, status, detail}],
 operations:[{name, times_fired, covered}], counter_example?}

It persists <stem>.report.json alongside the spec.

3. Report

If the returned JSON has an error field (e.g. the binary is not installed), show that message to the user and stop — do not render the normal result.

Render the JSON as text. Without -v, render each check as <check.name>: <check.status> (summary only). With -v, append the detail as <check.name>: <check.status> — <check.detail>:

Read the full file on GitHub · 103 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. 3d ago First seen · 103 lines · 9 tokens per session scan A 56f170296154

Subscribe to this mod's changes

test is a command published in the GitHub repository punt-labs/z-spec (5 stars, last pushed 3d ago), licensed MIT. It adds 9 tokens to every session and 920 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. It is 89% identical to test-dev, differing in 6 lines, and is treated as a copy.