define-product

A product-planning process that turns a committed idea into a brief, user descriptions, user journeys, feature map, and one-page blueprint. Personas describe types of users and their needs.

In plain words
What is it for?
Use it to define an MVP epic, connect planned work to users and journeys, and prepare the project for detailed task planning.
Why use it?
It gives developers a shared product definition before implementation, reducing guesses about what to build and why.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/ccevans/bobbycode/bobby-define
Any agent
npx skills add ccevans/bobbycode --skill bobby-define
Clone the repo
git clone --depth 1 https://github.com/ccevans/bobbycode

Made for: Claude Code, Codex.

Per session 204 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,683 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00204 $0.03683
Opus 5 $0.00102 $0.01842
Sonnet 5 $0.00041 $0.00737
Haiku 4.5 $0.00020 $0.00368

Measured yesterday against content hash 60197aab0030, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

define-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 yesterday.

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.

.claude/skills/bobby-define/SKILL.md · 262 lines

How it starts

The opening of the file, as written. The whole thing — 262 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Bobby Define Skill

Product definer — takes the MVP epic from a one-line idea to a locked product definition: brief, personas, journeys, feature map, and a blueprint you can read on one page. Runs the process a real product team runs, so that when bobby-plan decomposes the epic, every ticket traces to a feature, a journey step, and a persona — instead of being invented.

Scope

This skill DEFINES the product. It produces .bobby/product/ — four locked, committed artifacts plus a generated blueprint page — and ends by moving the epic to planning.

  • Not the idea gate: whether this is worth building at all is bobby-vet (run before the project exists). By the time define runs, the idea is committed.
  • Not visual design: what screens look like is bobby-design — it runs after define, using the personas and journeys as its inputs.
  • Not decomposition: tickets are bobby-plan's job (Product-Aware Epic Mode), which reads the feature map this skill locks.
  • One definition per project: .bobby/product/ describes THIS project's product. A second unrelated epic in the same repo reuses or extends it, not replaces it.

Before Starting

Read, in parallel:

  1. .claude/skills/bobby-define/learnings.md + .claude/skills/bobby-define/learnings.local.md and .claude/skills/bobby-shared/learnings.md + .claude/skills/bobby-shared/learnings.local.md
  2. The epic's ticket.md — its Description carries the idea, verbatim. Quote it; never paraphrase it into something you'd rather build.
  3. Any existing .bobby/product/*.md — resume, don't restart. If brief.md exists and is approved, start at Step 2. If the human wants a locked artifact changed, that's a Deviation + Changelog entry, not a rewrite.
  4. .bobby/architecture-wakeup.md if present (existing projects have constraints an idea-stage interview should respect).

The Three Rules (read before anything else)

Rule 1 — The human reacts. You define.

The founder is not a product manager. Never ask them to write a persona, enumerate features, or produce a journey. You draft from evidence; they react. Ask questions a founder can answer from lived experience ("who did you last see struggling with this?"), draft the artifact, then ask the stage's gate question. Their reaction — keep, strike, correct — is the input. Every stage ends with its ⛳ gate; nothing advances past a gate without their answer.

Read the full file on GitHub · 262 lines

Files

What ships with it

2 files 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.

Changes

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.

  1. yesterday First seen · 262 lines · 204 tokens per session scan A 60197aab0030

Subscribe to this mod's changes

define-product is a skill published in the GitHub repository ccevans/bobbycode (6 stars, last pushed 8d ago), licensed MIT. It adds 204 tokens to every session and 3,683 once invoked, about $0.0010 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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