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-competitive)<a href="https://agentmods.dev/skills/appsvortex/arness/arn-spark-stress-competitive"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-spark-stress-competitive/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-competitive"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-spark-stress-competitive.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 | $0.00101 | $0.01992 |
| Opus 5.5 | $0.00040 | $0.00797 |
| Sonnet 5.5 | $0.00020 | $0.00398 |
| Haiku 4.5 | $0.00010 | $0.00199 |
Grade A, and why
arn-spark-stress-competitive 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 — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arness Spark Stress Competitive
Stress-test a product concept through deep competitive gap analysis. This skill goes beyond surface-level feature comparison to identify where the product is uniquely strong, where competitors have real advantages, and where the market has gaps that no one is filling.
The process works in three stages:
- Deep research: The market researcher agent conducts thorough competitive intelligence in deep-analysis mode, going beyond the competitors identified during discovery
- Gap analysis: Features are categorized (core, differentiating, table-stakes), compared across competitors, and gaps are weighted against the product's own pillars
- Positioning assessment: The product's market position is evaluated for defensibility, switching costs, and crowded vs. underserved areas
The product concept is read but never modified -- all recommendations are captured in the competitive 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 |
| Competitive landscape | REQUIRED | Competitive Landscape section of product concept | Fallback cascade below |
| Product pillars | ENRICHES | Product Pillars section of product concept | Gap weighting is less targeted but analysis proceeds |
| Core experience | ENRICHES | Core Experience section of product concept | Feature identification is less complete |
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 · 167 lines · 101 tokens per session scan A bef6a820e17f
arn-spark-stress-competitive is a skill published in the GitHub repository AppsVortex/arness (33 stars, last pushed today), licensed MIT. It adds 101 tokens to every session and 1,992 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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