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-help)<a href="https://agentmods.dev/skills/appsvortex/arness/arn-spark-help"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-spark-help/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-help"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-spark-help.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 | $0.00123 | $0.02270 |
| Opus 5.5 | $0.00049 | $0.00908 |
| Sonnet 5.5 | $0.00025 | $0.00454 |
| Haiku 4.5 | $0.00012 | $0.00227 |
Grade A, and why
arn-spark-help 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 — 150 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arness Spark Help
Detect the user's current position in the Arness Spark exploration pipeline, render a diagram with the active stage marked, and suggest the next command to run. Supports cross-plugin awareness — detects activity in Arness Code and Arness Infra and provides hints at the bottom of the output. This skill is strictly read-only — it never modifies files or project state.
Allowed tools: Read, Glob, Grep only. This skill MUST NOT use Write, Edit, Bash, or Task tools. This skill MUST NOT invoke any agents.
Workflow
Step 0: Multi-Plugin Awareness
- Read the project's
CLAUDE.mdfile. - Extract the
## Arnesssection. - Detect other plugin field groups:
- code_fields_present: true if
Plans directoryORSpecs directorypresent in## Arness - infra_fields_present: true if
Infra plans directoryORInfra specs directorypresent in## Arness
- code_fields_present: true if
- For each detected plugin, do a quick existence check (max 2 files):
- Code: Check if
<Specs directory>contains anyFEATURE_*.mdorBUGFIX_*.md, OR<Plans directory>has any subdirectories - Infra: Check if
<Infra plans directory>has any subdirectories, OR ifDockerfileordocker-compose.ymlexists in the project root
- Code: Check if
- Record
{ plugin_name, has_activity: bool }for each detected plugin. - Proceed to Step 1. The cross-plugin hints are appended AFTER own status is rendered in Step 3.
Step 1: Load Configuration
- From the
## Arnesssection, extract Spark fields:- Vision directory (e.g.,
.arness/vision/) - Use cases directory (e.g.,
.arness/use-cases/) - Prototypes directory (e.g.,
.arness/prototypes/) - Spikes directory (e.g.,
.arness/spikes/) - Visual grounding directory (e.g.,
.arness/visual-grounding/) - Reports directory (e.g.,
.arness/reports/)
- Vision directory (e.g.,
If ## Arness is missing or no Spark fields present: Show the Spark pipeline diagram with all stages unmarked. Suggest /arn-brainstorming to start a new greenfield project. Do not attempt detection.
What ships with it
1 file 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 · 150 lines · 123 tokens per session scan A 6dd2d1bb8a3d
arn-spark-help is a skill published in the GitHub repository AppsVortex/arness (33 stars, last pushed today), licensed MIT. It adds 123 tokens to every session and 2,270 once invoked, about $0.0005 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.
Other skills, from other repositories
traction-eos
Implement the Entrepreneurial Operating System (EOS) to align vision and execution across a company. Use when the user mentions "EOS", "Entrepreneurial Operating System", "V/TO", "quarterly rocks", "Level 10 meetings", "accountability chart", "IDS process", "my company feels chaotic", "we keep having the same…
customer-onboarding-and-implementation
Takes a new customer from signature to working — setting a definition of live that both sides agreed before the contract was signed, planning and staffing the implementation, running data migration and integration realistically, training the people who will actually use it, and handing over to the ongoing…
promote-idea
Converts an album idea from IDEAS.md into an actual album project in one step. Use when the user says "promote [idea title]", "turn idea into album", or "start working on [idea]".
recap-doc
Post-development recap document generator. Use when: AI/Codex has implemented a feature and the user needs a guided walkthrough of what changed and why, with blind-spot detection and anticipated questions. Not for: Q&A follow-up (use /recap-ask), technical share-out for teammates (use /tech-brief), or generic code…
runbook
Generate and update feature release runbooks from existing docs and codebase. Use when: creating operational runbook, release handbook, deployment checklist, pre-release preparation. Not for: incident response (v2), code review (use codex-code-review), architecture design (use architecture).
wenlan-handoff
End a work session. Stores durable captures, writes a narrative session log, and automatically applies typed item-level deltas to the current Space Brief. Invoked as /wenlan-handoff.