Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add robisson/build-like-amazon-agent-skills --skill working-backwardsgit clone --depth 1 https://github.com/robisson/build-like-amazon-agent-skillsWrote 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/robisson/build-like-amazon-agent-skills/working-backwards)<a href="https://agentmods.dev/skills/robisson/build-like-amazon-agent-skills/working-backwards"><img src="https://agentmods.dev/badge/skills/robisson/build-like-amazon-agent-skills/working-backwards.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 | $0.00058 | $0.03322 |
| Opus 5 | $0.00029 | $0.01661 |
| Sonnet 5 | $0.00012 | $0.00664 |
| Haiku 4.5 | $0.00006 | $0.00332 |
Grade A, and why
working-backwards 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 245 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Working Backwards
Overview
Working Backwards is Amazon's signature product development methodology. Instead of starting with a technology or business idea and finding customers for it, you start with the customer and work backwards to the technology. The output is a PR/FAQ document that describes the finished product as if it already exists, written from the customer's perspective. If you can't write a compelling press release, you don't yet understand what you're building or why it matters.
The process has 5 stages, each with a clear deliverable that must pass review before advancing:
┌─────────────────────────────────────────────────────────────────┐
│ WORKING BACKWARDS FLOW │
├─────────────────────────────────────────────────────────────────┤
│ │
│ ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐ │
│ │ LISTEN │───▶│ DEFINE │───▶│ INVENT │───▶│ REFINE │ │
│ │ │ │ │ │ │ │ (PR/FAQ) │ │
│ └──────────┘ └──────────┘ └──────────┘ └──────────┘ │
│ │ │ │ │ │
│ ▼ ▼ ▼ ▼ │
│ Customer Problem Solution PR/FAQ │
│ Insights Statement Selection Document │
│ │ │
│ ▼ │
│ ┌──────────────┐ │
│ │ TEST & │ │
│ │ ITERATE │ │
│ └──────────────┘ │
│ │ │
│ ▼ │
│ Success Metrics │
│ & Experiments │
└─────────────────────────────────────────────────────────────────┘
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.
- 8d ago First seen · 245 lines · 58 tokens per session scan A 1f603e0b414b
working-backwards is a skill published in the GitHub repository robisson/build-like-amazon-agent-skills (14 stars, last pushed 3mo ago), licensed MIT. It adds 58 tokens to every session and 3,322 once invoked, about $0.0003 per session on Opus 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 2026-08-30.
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