qa

A quality-assurance guide for scenario-based acceptance testing. Acceptance testing checks whether software behaves as users and requirements expect, beyond what unit tests check in isolation.

In plain words
What is it for?
Use it to create QA plans and test happy paths, limits, invalid inputs, permissions, component integrations, and behavior that must keep working after changes.
Why use it?
It connects each acceptance requirement to an observable test result, helping catch missing workflows, edge cases, integration failures, and regressions.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/dean0x/devflow/qa
Any agent
npx skills add dean0x/devflow --skill qa
Clone the repo
git clone --depth 1 https://github.com/dean0x/devflow

Made for: Claude Code, Codex.

Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,381 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
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 $0.00031 $0.01381
Opus 5 $0.00015 $0.00691
Sonnet 5 $0.00006 $0.00276
Haiku 4.5 $0.00003 $0.00138

Measured yesterday against content hash 4331908ca167, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

qa scanned grade A with 1 finding 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 yesterday.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

| HTTP status | Response code from curl/fetch | API endpoints |
src/assets/skills/qa/SKILL.md · 137 lines

How it starts

The opening of the file, as written. The whole thing — 137 lines — stays where its author put it; the contents beside it link to each section on GitHub.

QA Patterns

Scenario-based acceptance testing methodology. Ensures implementations satisfy user-observable requirements beyond what unit tests cover.

Iron Law

VERIFY BEHAVIOR FROM THE USER'S PERSPECTIVE [1][2]

Test what the user asked for, not implementation details. Every acceptance criterion gets at least one scenario. Every scenario produces observable evidence. If you can't demonstrate it works from the outside, it doesn't work. [3][8]


Scenario Types [1][2][6]

Five categories ensure comprehensive coverage:

Type Purpose Example
Happy path Core functionality works as described "Add item → item appears in list"
Boundary/edge Limits, empty, maximum, minimum values "Add item with 1000-char name → truncated or rejected"
Negative path Invalid inputs, missing permissions, errors "Add item without auth → 401 returned"
Integration Components work together correctly "Add item → appears in search results"
Regression Existing behavior preserved after changes "Old items still load after schema migration"

Minimum coverage: At least one scenario per acceptance criterion. At least one boundary and one negative scenario per feature. [1][6]

Scenario Design from Acceptance Criteria [4][8][9]

Extract testable claims using Given/When/Then:

Acceptance criterion: "Users can upload files up to 10MB"

S1 (happy):    Given auth user, When upload 5MB file, Then 200 + file accessible
S2 (boundary): Given auth user, When upload 10MB file, Then 200 (exact limit)
S3 (boundary): Given auth user, When upload 10.1MB file, Then 413 rejected
S4 (negative): Given no auth, When upload 5MB file, Then 401
S5 (negative): Given auth user, When upload empty file, Then 400

Extracting criteria [4]: If no explicit acceptance criteria, derive from the request:

  1. What new behavior was requested? → happy path scenarios
  2. What inputs does it accept? → boundary scenarios [7][10]
  3. What should it reject? → negative scenarios
  4. What existing behavior must survive? → regression scenarios

Read the full file on GitHub · 137 lines

Files

What ships with it

5 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.

  1. yesterday First seen · 137 lines · 31 tokens per session scan A 4331908ca167

Subscribe to this mod's changes

qa is a skill published in the GitHub repository dean0x/devflow (19 stars, last pushed yesterday), licensed MIT. It adds 31 tokens to every session and 1,381 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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