requirements-engineering

requirements-engineering is a skill for Claude Code from jasonkneen/kiro. It costs 39 tokens per session (1,906 once invoked), scanned A, original, MIT.

A method for turning unclear feature ideas into specific, testable requirements using a consistent format called EARS.

In plain words
What is it for?
Writing user stories, acceptance criteria, system behavior, edge cases, and checks that requirements are complete.
Why use it?
It reduces misunderstandings about what a system should do and helps reveal missing cases before design or coding starts.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions Claude Code.

Part of the kiro plugin — 8 skills, 2 commands shipped together

Good fit Writing user stories, acceptance criteria, system behavior, edge cases, and checks that requirements are complete.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jasonkneen/kiro/requirements-engineering
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.

Any agent
npx skills add jasonkneen/kiro --skill requirements-engineering
Clone the repo
git clone --depth 1 https://github.com/jasonkneen/kiro

Made for: Claude Code.

Or install kiro, the plugin that ships this one along with the rest of its 8 skills, 2 commands.

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.

agentmods badge for requirements-engineering

README.md
[![agentmods](https://agentmods.dev/badge/skills/jasonkneen/kiro/requirements-engineering.svg)](https://agentmods.dev/skills/jasonkneen/kiro/requirements-engineering)
Your own site
<a href="https://agentmods.dev/skills/jasonkneen/kiro/requirements-engineering"><img src="https://agentmods.dev/badge/skills/jasonkneen/kiro/requirements-engineering.svg" alt="Measured on agentmods" height="20"></a>
Per session 39 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,906 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00039 $0.01906
Opus 5 $0.00019 $0.00953
Sonnet 5 $0.00008 $0.00381
Haiku 4.5 $0.00004 $0.00191

Measured 9d ago against content hash a97cf1582acb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

requirements-engineering 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.

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/requirements-engineering/SKILL.md · 267 lines

How it starts

The opening of the file, as written. The whole thing — 267 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Requirements Engineering

Master the art of capturing what needs to be built before diving into how to build it. This skill teaches the EARS (Easy Approach to Requirements Syntax) format for creating clear, testable requirements.

When to Use This Skill

Use requirements engineering when:

  • Starting any new feature or project
  • Clarifying ambiguous stakeholder requests
  • Creating acceptance criteria for user stories
  • Documenting system behavior for testing
  • Ensuring all team members share understanding

The EARS Format

EARS provides consistent patterns for writing requirements that are specific, testable, and unambiguous.

Basic Patterns

Event-Response (Most Common):

WHEN [triggering event] THEN [system] SHALL [required response]

Conditional Behavior:

IF [precondition is met] THEN [system] SHALL [required response]

Complex Conditions:

WHEN [event] AND [additional condition] THEN [system] SHALL [response]

Optional Conditions:

WHEN [event] OR [alternative event] THEN [system] SHALL [response]

Advanced Patterns

State-Based:

WHEN [system is in specific state] THEN [system] SHALL [behavior]

Performance:

WHEN [user action] THEN [system] SHALL [respond within X seconds/milliseconds]

Security:

IF [authentication condition] THEN [system] SHALL [security response]

Step-by-Step Process

Step 1: Capture User Stories

Format: As a [role], I want [feature], so that [benefit]

Focus on:

  • Who is the user? (role)
  • What do they want to accomplish? (feature)
  • Why does it matter? (benefit/value)

Example:

As a returning customer, I want to save my payment methods, so that I can checkout faster in the future.

Step 2: Generate Acceptance Criteria

For each user story, define specific acceptance criteria using EARS:

Example for payment methods:

**User Story:** As a returning customer, I want to save my payment methods, so that I can checkout faster.

**Acceptance Criteria:**
1. WHEN user adds a valid credit card THEN system SHALL securely store card details
2. WHEN user adds a card with invalid number THEN system SHALL display validation error
3. WHEN user has saved cards THEN system SHALL display list during checkout
4. WHEN user selects saved card THEN system SHALL pre-fill payment form
5. WHEN user deletes saved card THEN system SHALL remove card from list
6. IF user is not authenticated THEN system SHALL redirect to login before saving card
7. WHEN user adds card THEN system SHALL mask all but last 4 digits in display

Read the full file on GitHub · 267 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.

  1. 9d ago First seen · 267 lines · 39 tokens per session scan A a97cf1582acb

Subscribe to this mod's changes

requirements-engineering is a skill published in the GitHub repository jasonkneen/kiro (746 stars, last pushed 7mo ago), licensed MIT. It adds 39 tokens to every session and 1,906 once invoked, about $0.0002 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 2026-08-30.

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