What is story-writer?

An agent that turns an approved product requirements document, or PRD, into user stories with acceptance criteria. Acceptance criteria are checks that show when a story is complete, written in the Gherkin format used for behavior-based tests.

Use it to write implementation-ready user stories, define expected behavior, cover edge cases, track requirements, and estimate complexity.

It reduces unclear requirements and keeps each story connected to the original product plan. It also flags missing clarification, oversized stories, and unapproved PRDs.

How matheusbrramos/ProductFlow configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to matheusbrramos/ProductFlow. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/matheusbrramos/ProductFlow/main/.claude/agents/story-writer.md

Clone the repo

git clone --depth 1 https://github.com/matheusbrramos/ProductFlow

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/matheusbrramos/productflow/story-writer/github.svg)](https://agentmods.dev/agents/matheusbrramos/productflow/story-writer)

Your own site

<a href="https://agentmods.dev/agents/matheusbrramos/productflow/story-writer"><img src="https://agentmods.dev/badge/agents/matheusbrramos/productflow/story-writer/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/matheusbrramos/productflow/story-writer"><img src="https://agentmods.dev/badge/agents/matheusbrramos/productflow/story-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 28 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,305 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	$0.00028	$0.01305
Opus 5.5	$0.00011	$0.00522
Sonnet 5.5	$0.00006	$0.00261
Haiku 4.5	$0.00003	$0.00130

Measured 2mo ago against content hash 72f5f19fb6ed, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

story-writer 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 2mo 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.

.claude/agents/story-writer.md · 182 lines

How it starts

The opening of the file, as written. The whole thing — 182 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Story-Writer Agent - User Stories & Acceptance Criteria

<INPUTS_REQUIRED>

Campo	Obrigatorio	Fonte
PRD aprovado	Sim	docs/prd/{feature}.md
Personas	Sim	.context/empresa.md ou PRD
Prioridades	Nao	PM (default: por requisito)
</INPUTS_REQUIRED>

<QUALITY_BAR>

Todas as stories seguem INVEST
Acceptance criteria em Gherkin valido
Edge cases cobertos
Rastreabilidade ao PRD mantida
Estimativas de complexidade incluidas </QUALITY_BAR>

<EDGE_CASES>

PRD nao aprovado: Bloquear e pedir aprovacao primeiro
Requisito ambiguo: Marcar [NEEDS CLARIFICATION] e propor interpretacoes
Story muito grande (XL): Propor divisao em stories menores </EDGE_CASES>

Identidade

Stories sao a ponte entre estrategia e implementacao. Uma story bem escrita elimina ambiguidade e acelera o desenvolvimento.

Story clara + Acceptance Criteria precisos = Implementacao sem retrabalho
Story vaga + Criteria ambiguos = Bugs, retrabalho, frustracao

REGRAS CRITICAS

NUNCA FACA

Escrever codigo ou pseudo-codigo
Fazer decisoes de arquitetura tecnica
Mudar escopo definido no PRD
Remover requisitos do PRD original

Read the full file on GitHub · 182 lines

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.

2mo ago First seen · 182 lines · 28 tokens per session scan A 72f5f19fb6ed

Subscribe to this mod's changes

story-writer is an agent published in the GitHub repository matheusbrramos/ProductFlow (2 stars, last pushed 7mo ago), licensed MIT. It adds 28 tokens to every session and 1,305 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.

Planning Writing and docs

story-writer next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
story-writermatheusbrramos/ProductFlow	Agent	2	7mo ago	MIT	A	28	Claude Code
playwright-test-generatormicrosoft/playwright	Agent	99k	yesterday	Apache-2.0	A	151	Claude Code
.NET-Notebook-Migration-Agentmicrosoft/ai-agents-for-beginners	Agent	79k	4d ago	MIT	A	33	Claude Code
code-revieweranthropics/claude-cookbooks	Agent	54k	2d ago	MIT	A	52	Claude Code
AVM Owner Triagegithub/awesome-copilot	Agent	41k	yesterday	MIT	A	61	Claude Code
Ultimate Transparent Thinking Beast Modegithub/awesome-copilot	Agent	41k	yesterday	MIT	A	11	Claude Code
WinForms Expertgithub/awesome-copilot	Agent	41k	yesterday	MIT	A	19	Claude Code

ProductFlow: Agent for Claude Code