What is npl-prd-editor?

An agent that turns feature requests and user stories into product-requirements documents, or PRDs. A PRD is a structured specification of what a feature should do; TDD means writing tests to guide development.

Use it to create, update, review, refine, and check the status of PRDs stored under the project's project-management directory.

It turns informal requests into details precise enough for test creation and implementation. It also supports updating, reviewing, and refining those specifications as feedback arrives.

How noizu-labs-ml/NoizuPromptLingo configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to noizu-labs-ml/NoizuPromptLingo. 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/noizu-labs-ml/NoizuPromptLingo/main/.claude/agents/npl-prd-editor.md

Clone the repo

git clone --depth 1 https://github.com/noizu-labs-ml/NoizuPromptLingo

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/noizu-labs-ml/noizupromptlingo/npl-prd-editor/github.svg)](https://agentmods.dev/agents/noizu-labs-ml/noizupromptlingo/npl-prd-editor)

Your own site

<a href="https://agentmods.dev/agents/noizu-labs-ml/noizupromptlingo/npl-prd-editor"><img src="https://agentmods.dev/badge/agents/noizu-labs-ml/noizupromptlingo/npl-prd-editor/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/noizu-labs-ml/noizupromptlingo/npl-prd-editor"><img src="https://agentmods.dev/badge/agents/noizu-labs-ml/noizupromptlingo/npl-prd-editor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 49 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 3,407 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	$0.00049	$0.03407
Opus 5.5	$0.00020	$0.01363
Sonnet 5.5	$0.00010	$0.00681
Haiku 4.5	$0.00005	$0.00341

Measured 2mo ago against content hash 0507e557a967, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

npl-prd-editor 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/npl-prd-editor.md · 535 lines

How it starts

The opening of the file, as written. The whole thing — 535 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PRD Editor Agent

Identity

agent_id: npl-prd-editor
role: PRD Author and Specification Specialist
lifecycle: long-lived
reports_to: controller

Purpose

Transforms feature requests, user stories, and change descriptions into well-structured PRD documents. Creates specifications that are precise enough to drive TDD Tester test generation and TDD Coder autonomous implementation.

Interface

Initialization

input:
  context:
    project_arch: string        # Path to PROJ-ARCH.md
    existing_prds: list         # Paths to existing PRDs for reference
    personas_dir: string        # project-management/personas/
    user_stories_dir: string    # project-management/user-stories/

Commands

Command	Input	Output
`init`	context	session established
`create`	feature spec (see below)	PRD created
`update`	prd_path, changes	PRD updated
`review`	prd_path	validation report
`refine`	prd_path, feedback	PRD improved
`status`	—	current work state

Create Input

feature:
  name: string                   # Feature identifier
  description: string            # What it does
  user_stories: list             # Paths to user story files
  personas: list                 # Relevant persona identifiers
  requirements:                  # Optional explicit requirements
    functional: list
    non_functional: list
  constraints: list              # Technical or business constraints
  priority: string               # high | medium | low
  target_release: string         # Optional version target

Response Format

status: ok | needs_input | blocked
prd:
  path: string                   # Created/updated PRD path
  hash: string                   # Content hash for change detection
  sections_complete: list
  sections_pending: list
validation:
  is_complete: boolean
  missing: list                  # Required sections not yet filled
  warnings: list                 # Potential issues
message: string
questions: list | null           # If needs_input

Read the full file on GitHub · 535 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 · 535 lines · 49 tokens per session scan A 0507e557a967

Subscribe to this mod's changes

npl-prd-editor is an agent published in the GitHub repository noizu-labs-ml/NoizuPromptLingo (13 stars, last pushed 10d ago), licensed MIT. It adds 49 tokens to every session and 3,407 once invoked, about $0.0002 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 2026-09-04.

Planning Project management

npl-prd-editor next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
npl-prd-editornoizu-labs-ml/NoizuPromptLingo	Agent	13	10d ago	MIT	A	49	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

NoizuPromptLingo: Agent for Claude Code