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shrubbery: Skill for Claude Code

.claude/skills/challenge-roi/SKILL.md

challenge-roi is a skill for Claude Code from marek-burza/shrubbery. It costs 0 tokens per session (2,583 once invoked), scanned A, original, GPL-3.0.

An assessment of whether a data science, machine-learning, or open-source challenge, competition, or funding call is worth entering. It uses a provided link to examine eligibility, intellectual-property rules, expected cash value per hour, other benefits, and an overall decision.

In plain words
What is it for?
It is for screening competitions, challenges, and funding calls before deciding whether to apply or participate.
Why use it?
It helps you avoid spending time on an opportunity that you cannot enter or that has poor expected value. It also considers non-cash benefits rather than looking only at the prize.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is marek-burza/shrubbery's own configuration. It tells Claude Code how to work on shrubbery itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything shrubbery configures →

not rated 15repo 2d ago A scan 0 tokens GPL-3.0
View source ↗ marek-burza/shrubbery
Reuse

Borrowing it

Nothing to install: this file belongs to marek-burza/shrubbery. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/marek-burza/shrubbery/main/.claude/skills/challenge-roi/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/marek-burza/shrubbery

Made for: Claude Code.

Wrote 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.

agentmods badge for challenge-roi

README.md
[![agentmods](https://agentmods.dev/badge/skills/marek-burza/shrubbery/challenge-roi/github.svg)](https://agentmods.dev/skills/marek-burza/shrubbery/challenge-roi)
Your own site
<a href="https://agentmods.dev/skills/marek-burza/shrubbery/challenge-roi"><img src="https://agentmods.dev/badge/skills/marek-burza/shrubbery/challenge-roi/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.

agentmods 80×15 button for challenge-roi

Your own site · 80×15
<a href="https://agentmods.dev/skills/marek-burza/shrubbery/challenge-roi"><img src="https://agentmods.dev/badge/skills/marek-burza/shrubbery/challenge-roi.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,583 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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 5.1 $0.00000 $0.02583
Opus 5.5 $0.00000 $0.01033
Sonnet 5.5 $0.00000 $0.00517
Haiku 4.5 $0.00000 $0.00258

Measured 29d ago against content hash 39678ad18915, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

challenge-roi 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 29d 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/skills/challenge-roi/SKILL.md · 204 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 29d ago First seen · 204 lines · 0 tokens per session scan A 39678ad18915

Subscribe to this mod's changes

challenge-roi is a skill published in the GitHub repository marek-burza/shrubbery (15 stars, last pushed 2d ago), licensed GPL-3.0. It costs nothing until one of its globs matches a file; then it loads 2,583 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 2026-10-08.

Finance and fintechPythonResearchdata-sciencemachine-learningnumerai
Related

challenge-roi compared with skills from other repositories

challenge-roi next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
challenge-roimarek-burza/shrubberySkill152d agoGPL-3.0A0Claude Code
developing-with-streamlitstreamlit/streamlitSkill46kyesterdayApache-2.0A146Claude Code
marimo-pairmarimo-team/marimoSkill23kyesterdayApache-2.0A57Claude Code, Codex
fill-model-descriptionsmarimo-team/marimoSkill23kyesterdayApache-2.0A65Claude Code
configure_mcp_serverOpenBB-finance/OpenBBSkill74k1mo agononeA31Claude Code, Codex
work_with_serverOpenBB-finance/OpenBBSkill74k1mo agononeA33Claude Code, Codex
build_workspace_appOpenBB-finance/OpenBBSkill74k1mo agononeA57Claude Code, Codex