Borrowing it
Nothing to install: this file belongs to saski/arnesto. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/saski/arnesto/main/.agents/skills/shape-up/SKILL.mdgit clone --depth 1 https://github.com/saski/arnestoWrote 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/saski/arnesto/shape-up)<a href="https://agentmods.dev/skills/saski/arnesto/shape-up"><img src="https://agentmods.dev/badge/skills/saski/arnesto/shape-up.svg" alt="Measured on agentmods" 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 | $0.00085 | $0.00565 |
| Opus 5 | $0.00043 | $0.00282 |
| Sonnet 5 | $0.00017 | $0.00113 |
| Haiku 4.5 | $0.00009 | $0.00056 |
Grade A, and why
shape-up 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 3d 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.
This is a copy
100% identical to shape-up — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Domain Context
This skill implements a proven product management framework. The approach combines best practices from industry leaders and is designed for practical application in day-to-day PM work.
Input Requirements
- Context about your product, feature, or problem
- Relevant data, research, or constraints (recommended but optional)
- Clear articulation of what you're trying to achieve
Shape Up
What It Is
Shape Up is a product development methodology built on one core insight: you cannot estimate your way to shipping—you must shape your way there.
Traditional approaches ask "How long will this take?" and then try to hit that estimate. Shape Up flips this: decide upfront how much time you're willing to spend (the appetite), then shape a version of the solution that fits within that constraint.
The methodology emerged from 17 years of building Basecamp, where the founding team faced an unusual constraint: their only engineer (DHH) worked just 10 hours per week. This forced extreme clarity about what to build and ruthless scoping to ensure every hour counted.
The key shift: Move from "What's the estimate for this?" to "What version of this can we confidently ship in the time we're willing to spend?"
When to Use It
Use Shape Up when you need to:
- Stop projects from dragging — work that should take weeks is taking months
- Escape the estimate trap — you're tired of estimates that are always wrong
- Give teams real autonomy — not just ticket execution
- Reduce meeting overhead — Scrum rituals are consuming your time
- Ship meaningful chunks — not just incremental tickets
- Align product and engineering — there's a wall between them today
- Maintain startup speed — as you scale past 30-50 people
When Not to Use It
- You're 3 people or fewer — just talk to each other
- There's no real complexity
- You can't get engineering into shaping
- Leadership isn't bought in
- You're doing pure maintenance
Resources
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.
- 3d ago First seen · 59 lines · 85 tokens per session scan A 75aee8332714
shape-up is a skill published in the GitHub repository saski/arnesto (5 stars, last pushed today), licensed Unlicense. It adds 85 tokens to every session and 565 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to shape-up, differing in 0 lines, and is treated as a copy.
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