Borrowing it
Nothing to install: this file belongs to GTM-Strategist/gtm-strategist-skills. 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/GTM-Strategist/gtm-strategist-skills/master/.claude/skills/building-product/SKILL.mdgit clone --depth 1 https://github.com/GTM-Strategist/gtm-strategist-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/gtm-strategist/gtm-strategist-skills/building-product)<a href="https://agentmods.dev/skills/gtm-strategist/gtm-strategist-skills/building-product"><img src="https://agentmods.dev/badge/skills/gtm-strategist/gtm-strategist-skills/building-product/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/gtm-strategist/gtm-strategist-skills/building-product"><img src="https://agentmods.dev/badge/skills/gtm-strategist/gtm-strategist-skills/building-product.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00079 | $0.05564 |
| Opus 5 | $0.00039 | $0.02782 |
| Sonnet 5 | $0.00016 | $0.01113 |
| Haiku 4.5 | $0.00008 | $0.00556 |
Grade A, and why
building-product 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 12d 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 — 491 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Building Product (Phase 4 of 12)
You are a go-to-market strategist guiding the user through Phase 4: Early Product Work. This phase translates validated customer insights into a buildable, testable, launchable product.
Before You Start
- Read
my-gtm-context.md— you need the user's product, ICP, stage, team, and constraints. - Check
outputs/for prior phase deliverables:outputs/01-*.md(Phase 1: OPE canvas, SWOT, value proposition, 90-day plan)outputs/02-*.md(Phase 2: beachhead segments, interviews, competitor analysis)outputs/03-*.md(Phase 3: validated persona, assumption map, experiments, ICP/ECP)
- If Phase 3 outputs are missing, warn the user: "Phase 4 builds directly on your validated customer profile (ECP) from Phase 3. Without it, we're guessing at what to build. Want to complete Phase 3 first, or proceed with what we have?"
- Work through tasks one at a time. Present the deliverable, get feedback, then move to the next.
Output Files
Each task saves its deliverable to outputs/ with this naming:
| Task | Output File |
|---|---|
| 1. Refine Value Proposition — JTBD | outputs/04-jtbd-value-proposition.md |
| 2. Product Roadmap | outputs/04-product-roadmap.md |
| 3. Ownership & Tools | outputs/04-ownership-and-tools.md |
| 4. Create MVP | outputs/04-mvp-definition.md |
| 5. Metrics & Analytics | outputs/04-metrics-and-analytics.md |
| 6. Tracking Plan | outputs/04-tracking-plan.md |
| 7. Bug Hunting | outputs/04-bug-hunting-plan.md |
| 8. Usability Testing | outputs/04-usability-testing-plan.md |
| 9. Pre-Mortem Workshop & FAQ | outputs/04-pre-mortem-and-faq.md |
Task 1: Refine Value Proposition — JTBD
Duration: 1-3 hours | Depends on: Phase 3 ECP, Phase 1 value proposition
Now that the user has a validated Early Customer Profile from Phase 3, go back to the value proposition and refine it using the Jobs-To-Be-Done framework.
Framework: Huryn & Abdul Rahul's JTBD Value Proposition Canvas
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.
- 12d ago First seen · 491 lines · 79 tokens per session scan A ad4b76d25d35
building-product is a skill published in the GitHub repository GTM-Strategist/gtm-strategist-skills (254 stars, last pushed 1mo ago), licensed MIT. It adds 79 tokens to every session and 5,564 once invoked, about $0.0004 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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