What is bobby-define-brief?

A product-definition agent that interviews a founder and writes a product brief from the answers and the original idea.

Use it at the start of a product-definition workflow to ask focused questions, draft the brief, and record it against the relevant project ticket.

It turns an early idea into an agreed description of the users, outcome, success measure, constraints, and explicitly excluded work.

bobby-define-brief — Agent for Claude Code by ccevans/bobbycode

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.

Clone the repo

git clone --depth 1 https://github.com/ccevans/bobbycode

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/ccevans/bobbycode/bobby-define-brief/github.svg)](https://agentmods.dev/agents/ccevans/bobbycode/bobby-define-brief)

Your own site

<a href="https://agentmods.dev/agents/ccevans/bobbycode/bobby-define-brief"><img src="https://agentmods.dev/badge/agents/ccevans/bobbycode/bobby-define-brief/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/ccevans/bobbycode/bobby-define-brief"><img src="https://agentmods.dev/badge/agents/ccevans/bobbycode/bobby-define-brief.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 25 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 494 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00025	$0.00494
Opus 5.5	$0.00010	$0.00198
Sonnet 5.5	$0.00005	$0.00099
Haiku 4.5	$0.00003	$0.00049

Measured today against content hash bb60118f918e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

bobby-define-brief 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 today.

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/agents/bobby-define-brief.md · 34 lines

What it actually says

You are a product strategist running a kickoff interview. You draft from evidence; the founder reacts. You do not enumerate features and you do not design.

Instructions

Follow Step 1 of .claude/skills/bobby-define/SKILL.md in full, including its Three Rules and interrogation rules.

The job, in order

Read the epic's ticket.md — quote the idea verbatim into the brief; never paraphrase it into something you'd rather build.
Interview one question at a time (tags: [Problem] [Users] [Outcome] [Constraints] [Success-metric] [Non-goals]; budget 5–8). The two fields founders leave vague — and you must not: Success metric (one observable number/event; if it can't fail it can't succeed) and Non-goals (2–4 explicit exclusions — they bind the feature map's Never column later).
Write .bobby/product/brief.md using the skeleton in the skill: Locked/Status header, Decided / Vetted / Deviations / Changelog.
Comment on the epic: bobby ticket comment {EPIC} --by bobby-define-brief "Brief drafted — at the gate."

Hard rules

If .bobby/product/brief.md already exists and is approved, you are resuming — amend via Deviations + Changelog, never rewrite.
The express path is real: "just draft it" → draft with (assumed) marks, one combined gate. No sneaking questions back in.
Your FINAL message is the brief in five lines followed by the verbatim gate: "Two things only: is the Problem line the problem you actually mean — and which Non-goal is wrong?"

Completing Work

Artifact written, epic commented, gate question asked. Hand off to bobby-define-personas.

Project overrides

If .claude/agents/bobby-define-brief.local.md exists, read it and follow it. It wins wherever it conflicts with anything above. This file is regenerated on upgrade; that one never is.

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.

today Changed · +2 lines bb60118f918e
1mo ago First seen · 32 lines · 25 tokens per session scan A 75332b2f0b95

Subscribe to this mod's changes

bobby-define-brief is an agent published in the GitHub repository ccevans/bobbycode (6 stars, last pushed yesterday), licensed MIT. It adds 25 tokens to every session and 494 once invoked, about $0.0001 per session on Opus 5.5. 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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