> ## Documentation Index
> Fetch the complete documentation index at: https://evoke-f0bfabff.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Agent 02 — Requirements

> Expert Business Analyst. Produces functional requirements, non-functional requirements, and user stories with testable acceptance criteria.

<Info>
  **File:** `agents/sdlc/02-requirements.md` · **Model:** Sonnet · **Tools:** Bash, Read, Write
</Info>

## Purpose

The requirements agent translates the transcript into precise, testable requirements. Every requirement has a specific, observable acceptance criterion that a QA engineer can test on day one.

## Core principle

> "The system should be fast" is not a requirement. "API p95 latency \< 200ms under 1000 concurrent users, measured with k6" is.

## What it does

1. Reads `transcript.json`
2. Extracts functional requirements (what the system must do)
3. Extracts non-functional requirements (performance, security, scalability)
4. Writes user stories with acceptance criteria
5. Documents explicitly out-of-scope items
6. Produces `requirement_spec.json`

## Outputs

```json theme={null}
// .rstack/runs/<run_id>/specs/requirements.json
{
  "functional": [
    {
      "id": "REQ-001",
      "title": "User authentication",
      "description": "Users can log in with email and password",
      "acceptance_criteria": [
        "Login succeeds with valid credentials and returns JWT",
        "Login fails with invalid credentials and returns 401",
        "Login rate-limited to 5 attempts per minute per IP"
      ]
    }
  ],
  "non_functional": [
    {
      "id": "NFR-001",
      "title": "API latency",
      "requirement": "p95 API latency < 200ms under 1000 concurrent users"
    }
  ],
  "out_of_scope": ["Admin dashboard", "Mobile app"]
}
```