A reverse-engineering tool that turns a frontend, backend, or full-stack codebase into a Product Requirements Document. A PRD is a plain-language specification of what a product should do, including pages, interactions, data, and interfaces.

Use it to document web pages, state management, API integrations, backend models, status values, and user interactions, or to prepare a reconstruction brief for engineers or AI agents.

Existing software often lacks complete product documentation, making maintenance or rebuilding uncertain. This extracts the implemented routes, components, models, APIs, and user flows into one specification.

code-to-prd — Skill for Codex by bestagentkits

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/bestagentkits/agency-skills

agentmods

npx agentmods add skills/bestagentkits/agency-skills/code-to-prd

Made for: Codex.

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/skills/bestagentkits/agency-skills/code-to-prd/github.svg)](https://agentmods.dev/skills/bestagentkits/agency-skills/code-to-prd)

Your own site

<a href="https://agentmods.dev/skills/bestagentkits/agency-skills/code-to-prd"><img src="https://agentmods.dev/badge/skills/bestagentkits/agency-skills/code-to-prd/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/skills/bestagentkits/agency-skills/code-to-prd"><img src="https://agentmods.dev/badge/skills/bestagentkits/agency-skills/code-to-prd.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 151 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,508 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	$0.00151	$0.04508
Opus 5	$0.00076	$0.02254
Sonnet 5	$0.00030	$0.00902
Haiku 4.5	$0.00015	$0.00451

Measured 9d ago against content hash 7a11ba564076, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

code-to-prd 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 9d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/codebase_analyzer.py, scripts/prd_scaffolder.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/claude-skills/code-to-prd/SKILL.md · 497 lines

How it starts

The opening of the file, as written. The whole thing — 497 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Name

Code → PRD

Description

Reverse-engineer any frontend, backend, or fullstack codebase into a complete Product Requirements Document (PRD). Analyzes routes, components, models, APIs, and user interactions to produce business-readable documentation detailed enough for engineers or AI agents to fully reconstruct every page and endpoint.

Code → PRD: Reverse-Engineer Any Codebase into Product Requirements

Features

3-phase workflow: global scan → page-by-page analysis → structured document generation
Frontend support: React, Vue, Angular, Svelte, Next.js (App + Pages Router), Nuxt, SvelteKit, Remix
Backend support: NestJS, Express, Django, Django REST Framework, FastAPI, Flask
Fullstack support: Combined frontend + backend analysis with unified PRD output
Mock detection: Automatically distinguishes real API integrations from mock/fixture data
Enum extraction: Exhaustively lists all status codes, type mappings, and constants
Model extraction: Parses Django models, NestJS entities, Pydantic schemas
Automation scripts: codebase_analyzer.py for scanning, prd_scaffolder.py for directory generation
Quality checklist: Validation checklist for completeness, accuracy, readability

Usage

# Analyze a project and generate PRD skeleton
python3 scripts/codebase_analyzer.py /path/to/project -o analysis.json
python3 scripts/prd_scaffolder.py analysis.json -o prd/ -n "My App"

# Or use the slash command
/code-to-prd /path/to/project

Examples

Frontend (React)

/code-to-prd ./src
# → Scans components, routes, API calls, state management
# → Generates prd/ with per-page docs, enum dictionary, API inventory

Backend (Django)

/code-to-prd ./myproject
# → Detects Django via manage.py, scans urls.py, views.py, models.py
# → Documents endpoints, model schemas, admin config, permissions

Fullstack (Next.js)

/code-to-prd .
# → Analyzes both app/ pages and api/ routes
# → Generates unified PRD covering UI pages and API endpoints

Read the full file on GitHub · 497 lines

Files

What ships with it

10 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.

9d ago First seen · 497 lines · 151 tokens per session scan A 7a11ba564076

Subscribe to this mod's changes

code-to-prd is a skill published in the GitHub repository bestagentkits/agency-skills (11 stars, last pushed 2mo ago), licensed MIT. It adds 151 tokens to every session and 4,508 once invoked, about $0.0008 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 2026-09-03.

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