scenario-testing

A command for reviewing whether tests describe realistic user scenarios rather than only checking individual functions.

In plain words
What is it for?
Auditing tests and rewriting incomplete ones as scenario descriptions with goals, actions, scale, duration, and failure modes.
Why use it?
It exposes missing coverage for different users, traffic levels, run lengths, timing, concurrency, and failure conditions.

Command for Claude Code

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/homenshum/nodebenchai/scenario-testing
Clone the repo
git clone --depth 1 https://github.com/HomenShum/NodeBenchAI

Made for: Claude Code.

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 457 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 $0.00457
Opus 5 $0.00000 $0.00229
Sonnet 5 $0.00000 $0.00091
Haiku 4.5 $0.00000 $0.00046

Measured 2d ago against content hash afc0fe51ca05, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

scenario-testing 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 2d 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.

.claude/commands/scenario-testing.md · 54 lines

What it actually says

Scenario Testing Review

Review the tests in the current file or feature against the scenario-based testing mandate.

What to check

For every test in scope, verify it meets ALL six criteria:

  1. Who — Is a specific user persona defined? (not just "a user")
  2. What — Is the test starting from a user goal, not a function signature?
  3. How — Are action sequence, timing, and concurrency explicitly specified?
  4. Scale — Does the test define behavior at 1 user AND 10+ concurrent? If not, flag it.
  5. Duration — Does the test cover both short-running (burst) AND long-running (sustained) scenarios?
  6. Failure modes — Are edge cases, degraded conditions, and adversarial inputs covered?

Output format

For each test found, output:

Test: <test name>
Persona: <defined / MISSING>
Goal orientation: <user goal / function-signature-oriented — REWRITE>
Scale coverage: <1x only / 10x / 100x>
Duration: <short-only / long-only / BOTH>
Failure modes covered: <list or NONE>
Verdict: PASS / NEEDS REWORK

Then for each NEEDS REWORK:

  • Explain what's missing
  • Provide a rewritten scenario docstring using the anatomy template:
Scenario: <name>
User:      <persona>
Goal:      <user goal>
Prior state: <system state before scenario>
Actions:   <sequence with timing>
Scale:     <1x / 10x / 100x>
Duration:  <single request / session / multi-day>
Expected:  <state + side effects + UI>
Edge cases: <degraded / adversarial / partial>

Anti-patterns to catch and flag

  • Test has no persona ("user" with no context)
  • Clean DB every time — no accumulated state
  • No concurrency
  • All assertions on return values only, no side effect checks
  • mockImplementation(() => ({})) covering every dependency
  • Happy path only — no sad paths
  • "It passes in CI" with no production-scale verification plan
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. 2d ago First seen · 54 lines · 0 tokens per session scan A afc0fe51ca05

Subscribe to this mod's changes

scenario-testing is a command published in the GitHub repository HomenShum/NodeBenchAI (14 stars, last pushed 19d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 457 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.