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-prfaq)<a href="https://agentmods.dev/skills/appsvortex/arness/arn-spark-stress-prfaq"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-spark-stress-prfaq/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-prfaq"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-spark-stress-prfaq.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 | $0.00144 | $0.02496 |
| Opus 5.5 | $0.00058 | $0.00998 |
| Sonnet 5.5 | $0.00029 | $0.00499 |
| Haiku 4.5 | $0.00014 | $0.00250 |
Grade A, and why
arn-spark-stress-prfaq 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 — 207 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arness Spark Stress PR/FAQ
Stress-test a product concept using Amazon's PR/FAQ method. This technique forces the product concept through two filters:
- Draft phase: A marketing PM agent writes the best possible public story -- a compelling press release, customer FAQ, and internal FAQ. If the press release is unconvincing, the product concept likely has clarity problems.
- Critique phase: The same marketing PM agent (in a separate invocation, with no memory of drafting) adversarially attacks the draft -- finding questions the PR dodges, identifying crack points where claims exceed substance, and recommending concept changes.
The two phases use separate agent invocations to prevent rubber-stamping. A critic who remembers being the drafter unconsciously defends what it wrote. Separate invocations force genuine adversarial evaluation.
The product concept is read but never modified -- all recommendations are captured in the PR/FAQ 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. - If the Reports directory does not exist, create it with
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 |
| Product pillars | ENRICHES | Product Pillars section of product concept | Draft messaging is less focused; critique has fewer anchors |
| Competitive landscape | ENRICHES | Competitive Landscape section of product concept | Draft positioning is less grounded in market context |
| Target personas | ENRICHES | Target Personas section of product concept | Customer quote in press release is less persona-specific |
What ships with it
2 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 · 207 lines · 144 tokens per session scan A dd0e0ff182fe
arn-spark-stress-prfaq is a skill published in the GitHub repository AppsVortex/arness (33 stars, last pushed today), licensed MIT. It adds 144 tokens to every session and 2,496 once invoked, about $0.0006 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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