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 stanislavnianko/product-discovery-claude-skills --skill prototype-plangit clone --depth 1 https://github.com/stanislavnianko/product-discovery-claude-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/stanislavnianko/product-discovery-claude-skills/prototype-plan)<a href="https://agentmods.dev/skills/stanislavnianko/product-discovery-claude-skills/prototype-plan"><img src="https://agentmods.dev/badge/skills/stanislavnianko/product-discovery-claude-skills/prototype-plan/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/stanislavnianko/product-discovery-claude-skills/prototype-plan"><img src="https://agentmods.dev/badge/skills/stanislavnianko/product-discovery-claude-skills/prototype-plan.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00064 | $0.01261 |
| Opus 5 | $0.00032 | $0.00630 |
| Sonnet 5 | $0.00013 | $0.00252 |
| Haiku 4.5 | $0.00006 | $0.00126 |
Grade A, and why
prototype-plan 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 — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Prototype Plan
Part of the discovery-phase skill pack ·
validationgroup · readsdiscovery-context.md(runprofile-builderfirst if missing).
A prototype proves user/product assumptions in a realistic environment. Built minimally, demoed deliberately, torn down by contract.
Step 1 — Read context
Read discovery-context.md (section 3. Engagement — mode + budget drive prototype ambition), scope-doc.md (prototype is a slice of MVP scope), risk-assumption-map.md (top-3 assumptions), and optionally tech-spike-report.md.
If discovery-context.md is missing, ask the BA inline: "who's running the prototype build — solo BA / BA + engineer / engineering lead?" — tag [ASSUMED]. If scope-doc.md is missing, proceed tagged [NO-SCOPE-DOC]. If risk-assumption-map.md is missing, ask for 1–3 assumptions inline or proceed tagged [NO-RISK-FRAME]. Never block; recommend profile-builder / feature-scoping / risk-assumption-mapping for high-stakes work.
Reality checks (warn + confirm, do not halt):
- If
tech-spike-report.mdsays feasibility is Red, warn that the prototype will test politics, not tech. Offer: resolve the blocker first (re-spike / re-scope / pivot viaopportunity-mapping), defer to delivery, or proceed with a⚠ RED-FEASIBILITY-OVERRIDEbanner and aggressive tear-down plan. - If context shows no engineering capacity, warn that the plan will be conceptual rather than runnable. Offer: loop in an engineer, defer to delivery, switch to
feasibility-spike(smaller), or proceed solo with a⚠ NO-ENGINEER-OVERRIDEbanner — Step 7 (runnable skeleton) will be skipped or stubbed.
Step 2 — State the prototype objective
One sentence. End-to-end happy path.
"The prototype lets a single SMB admin import a CSV, see preview, and confirm — in one session, on real data."
Step 3 — Pre-committed success criteria
Before any code:
- Happy-path completion time:
<N>minutes <N>users complete unassisted- Specific signal
<X>crosses threshold<Y>
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 113 lines · 64 tokens per session scan A 471156a00678
prototype-plan is a skill published in the GitHub repository stanislavnianko/product-discovery-claude-skills (1 stars, last pushed 4mo ago), licensed MIT. It adds 64 tokens to every session and 1,261 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.
Other skills, from other repositories
jtbd-extractor
Turn raw research into Jobs-to-be-Done statements showing what users are really trying to accomplish. Use when: extract jobs, jtbd analysis, jobs to be done, what job is the user hiring, underlying user needs.
assumption-mapper
Surfaces the assumptions a product or strategy depends on, classifies them by criticality and evidence quality, and produces a prioritized test plan. Use when: assumption mapping, identify assumptions, what could go wrong, leap-of-faith assumptions, riskiest assumption test, RAT, assumption inventory, validate before…
competitive-analyzer
Structured competitive teardown for product discovery - surface the 4-6 dimensions buyers actually weigh, score every competitor on each, and identify exploitable gaps. Use when: competitive analysis, competitor teardown, market positioning, where do we win, where do we lose, competitive gap analysis, competitor audit.
feedback-prioritizer
Triages a backlog of raw customer feedback into a ranked list of opportunities scored on reach, severity, strategic fit, and confidence. Outputs a prioritized list with explicit "do not act" callouts for vocal-minority signals. Use when: triage feedback, prioritize feature requests, customer feedback backlog, what…
north-star-metric-finder
Identifies a candidate North Star Metric (NSM) for a product - the single metric that captures the value the product delivers to its customers and predicts long-term business growth. Tests candidates against five criteria and surfaces input metrics that move it. Use when: north star metric, NSM, single metric that…
prd-taskmaster
Zero-config goal-to-tasks engine (the Atlas engine). Takes any goal (software, pentest, business, learning), runs adaptive discovery via brainstorming, generates a validated spec, parses into TaskMaster tasks, and hands off to execution. Use when user says "PRD", "product requirements", "I want to build", invokes…