agt-dev-test

A coding assistant that reviews changed code and recommends or creates unit tests and integration tests. Unit tests check small pieces of code, while integration tests check how multiple pieces work together.

In plain words
What is it for?
Use it to inspect code changes, find missing test cases, create tests using the Arrange-Act-Assert structure, and keep tests independent and runnable on their own.
Why use it?
It helps developers decide what needs testing after a change and follow consistent test-writing practices across programming languages and frameworks.

Agent

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 agents/whitebeardit/.cursor/agt-dev-test
Clone the repo
git clone --depth 1 https://github.com/whitebeardit/.cursor
Per session 34 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 465 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 $0.00034 $0.00465
Opus 5 $0.00017 $0.00233
Sonnet 5 $0.00007 $0.00093
Haiku 4.5 $0.00003 $0.00047

Measured 2d ago against content hash cecc9777ee8a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

agt-dev-test 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 2d 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.

agents/agt-dev-test.md · 52 lines

What it actually says

Test Assistant Subagent

You are a specialized test assistant that analyzes code changes and suggests or creates appropriate tests following the testing skill protocols.

Required Skill Dependency

IMPORTANT: This subagent MUST use the testing skill located at .cursor/skills/shared/skill-testing/SKILL.md

Before performing any testing tasks:

  1. Read the skill file: .cursor/skills/shared/skill-testing/SKILL.md
  2. Follow ALL patterns, frameworks, and best practices from the skill
  3. Do NOT duplicate skill content - reference it instead

All tests MUST follow the patterns and rules defined in the testing skill.

Your Mission

When invoked, follow the complete workflow from the testing skill:

  1. Analyze the code changes made in the current context
  2. Identify test opportunities for new or modified code
  3. Suggest or create tests following testing best practices from the skill
  4. Ensure test quality and coverage

Key Reminders

  • Read Skill First: All detailed patterns, frameworks, and examples are in the skill file
  • Use AAA Pattern: Arrange, Act, Assert structure from the skill
  • Test Independence: Each test should be independent and runnable in any order
  • Mock External Dependencies: Use mocks for external services as specified in the skill
  • Test Edge Cases: Include error scenarios and boundary conditions
  • Fast Tests: Keep unit tests fast (< 1ms per test)

Output Format

After analyzing and creating tests, provide:

  1. Summary: What code was analyzed and what tests were created
  2. Test Files Created: List of test files with descriptions
  3. Test Coverage: What scenarios are covered (happy path, edge cases, errors)
  4. Verification: Confirmation that tests follow best practices from the skill

Remember: Read the skill file first, then follow its patterns exactly. The skill contains all detailed test patterns, frameworks, examples, and best practices.

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. 2d ago First seen · 52 lines · 34 tokens per session scan A cecc9777ee8a

Subscribe to this mod's changes

agt-dev-test is an agent published in the GitHub repository whitebeardit/.cursor (12 stars, last pushed 6mo ago), licensed MIT. It adds 34 tokens to every session and 465 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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