Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add AppsVortex/arness/plugin install arn-sparkWrote 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.
[](https://agentmods.dev/skills/appsvortex/arness/arn-spark-stress-interview)<a href="https://agentmods.dev/skills/appsvortex/arness/arn-spark-stress-interview"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-spark-stress-interview/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.
<a href="https://agentmods.dev/skills/appsvortex/arness/arn-spark-stress-interview"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-spark-stress-interview.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00109 | $0.03189 |
| Opus 5.5 | $0.00044 | $0.01276 |
| Sonnet 5.5 | $0.00022 | $0.00638 |
| Haiku 4.5 | $0.00011 | $0.00319 |
Grade A, and why
arn-spark-stress-interview 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 today.
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.
How it starts
The opening of the file, as written. The whole thing — 258 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arness Spark Stress Interview
Stress-test a product concept by conducting structured synthetic user interviews. This skill generates 3 synthetic personas from the product concept's persona moulds, applies adversarial casting overlays (Pragmatist, Skeptic, Power User), and runs each through a 3-phase "Two-Part Reveal" interview protocol:
- Phase 1 -- Blind Problem Check: The persona hears about the problem without knowing the product exists. Do they even care?
- Phase 2 -- Elevator Pitch Reveal: The full product concept is revealed. What resonates? What falls flat? What is missing?
- Phase 3 -- Dealbreaker Probe: The weakest aspects are presented head-on. Would they still use this?
The process produces brutally honest feedback from 3 distinct adversarial perspectives, synthesized into actionable concept update recommendations. The product concept is read but never modified -- all recommendations are captured in the interview report for later review.
Prerequisites
Configuration Check
- Read the project's
CLAUDE.mdand check for a## Arnesssection - If found, extract the configured Vision directory and Reports directory paths
- If no
## Arnesssection exists or Arness Spark fields are missing, inform the user: "Arness Spark is not configured for this project yet. Run/arn-brainstormingto get started — it will set everything up automatically." Do not proceed without it. - Create the reports directory structure if it does not exist:
mkdir -p <reports-dir>/stress-tests/
Data Availability
| Artifact | Status | Location | Fallback |
|---|---|---|---|
| Product concept | REQUIRED | <vision-dir>/product-concept.md |
Cannot proceed without it -- suggest running /arn-spark-discover |
| Persona moulds | REQUIRED | Target Personas section of product concept | Fallback cascade below |
| Product pillars | ENRICHES | Product Pillars section of product concept | Interview proceeds but questions are less targeted |
| Competitive landscape | ENRICHES | Competitive Landscape section of product concept | Phase 3 competitive comparison questions are skipped |
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.
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.
- today First seen · 258 lines · 109 tokens per session scan A c2ae6e15d8ff
arn-spark-stress-interview is a skill published in the GitHub repository AppsVortex/arness (33 stars, last pushed today), licensed MIT. It adds 109 tokens to every session and 3,189 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-10-25.
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