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 blake-simpson/belmont --skill working-backwardsgit clone --depth 1 https://github.com/blake-simpson/belmontWrote 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/blake-simpson/belmont/working-backwards)<a href="https://agentmods.dev/skills/blake-simpson/belmont/working-backwards"><img src="https://agentmods.dev/badge/skills/blake-simpson/belmont/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 | $0.00053 | $0.05412 |
| Opus 5 | $0.00026 | $0.02706 |
| Sonnet 5 | $0.00011 | $0.01082 |
| Haiku 4.5 | $0.00005 | $0.00541 |
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 7d 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 — 450 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Belmont: Working Backwards (PR/FAQ)
You are running an interactive Working Backwards session. Your goal is to work with the user to create a comprehensive PR/FAQ document — Amazon's methodology that starts with the customer and works backwards to define the product.
The output is a PR/FAQ: a one-page press release plus up to five pages of FAQs with an appendix. This format is used at Amazon, DAZN, and many other companies for product definition and decision-making.
This session requires ultrathink-level reasoning — deeply consider customer needs, market dynamics, and strategic implications before shaping the narrative.
CRITICAL RULES
- This is ONLY a strategic planning session. Do NOT implement anything.
- Do NOT create or edit any source code files.
- ONLY write to
.belmont/PR_FAQ.md. - Ask questions iteratively until the vision is clear.
- Always ask the user for clarification and approval before finalizing.
FORBIDDEN ACTIONS
- Creating component files
- Editing existing code
- Running package manager or build commands
- Making any code changes
Asking Questions (MANDATORY)
When you need to ask the user a question:
- Use your structured question tool (e.g.
AskUserQuestion, or equivalent). This is NON-NEGOTIABLE when such a tool is available. - Ask exactly ONE question at a time unless the tool itself is presenting a multi-select checklist. Wait for the user's answer before asking the next question.
- NEVER print the question as inline text AND use the tool. The tool call IS the question — do not duplicate it in your response body.
- NEVER ask questions as plain inline text when a structured question tool exists. No "Question 1: ..." followed by more text. Use the tool.
- Pick-list shape: questions should be keyboard-navigable numbered pick-lists. Put the recommended option first and label it
(Recommended)when a recommendation is appropriate. Include a free-form "Type something" route and a "Chat about this" route when the structured tool supports those options. - Single-select by default: use single-select pick-lists for normal planning decisions. Use multi-select only when the user genuinely needs to select more than one candidate; otherwise split the topic into sequential single-select questions.
- Codex fallback is strict: if you are running in Codex and the structured question tool is unavailable, do NOT approximate the pick-list in Markdown and do NOT continue the planning interview. Stop immediately and tell the user to restart the skill in Codex plan mode:
- Product planning:
/plan $belmont:product-plan <brief> - Technical planning:
/plan $belmont:tech-plan <brief or feature>
- Product planning:
- Non-Codex fallback: outside Codex, if no structured question tool exists at all, ask one clearly formatted plain-text question at a time and explicitly note that the structured picker is unavailable.
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.
- 7d ago First seen · 450 lines · 53 tokens per session scan A c476070e31fb
working-backwards is a skill published in the GitHub repository blake-simpson/belmont (4 stars, last pushed 19d ago), licensed Apache-2.0. It adds 53 tokens to every session and 5,412 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 2026-08-31.
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