dev-test-and-explain

dev-test-and-explain is a skill for Claude Code, Codex from joinwell52-AI/CodeFlowMu-open. It costs 44 tokens per session (181 once invoked), scanned A, original, MIT.

A process for checking completed code changes and explaining the test evidence, remaining risks, and any limits on what was verified.

In plain words
What is it for?
Use it after implementation to run relevant tests when possible and prepare an accurate report for product managers, testers, or administrators.
Why use it?
It prevents reports from claiming that tests passed when they were not run and makes failures or untested areas visible to reviewers.

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/joinwell52-ai/codeflowmu-open/dev-test-and-explain
Any agent
npx skills add joinwell52-AI/CodeFlowMu-open --skill dev-test-and-explain
Clone the repo
git clone --depth 1 https://github.com/joinwell52-AI/CodeFlowMu-open

Made for: Claude Code, Codex.

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 dev-test-and-explain

README.md
[![agentmods](https://agentmods.dev/badge/skills/joinwell52-ai/codeflowmu-open/dev-test-and-explain.svg)](https://agentmods.dev/skills/joinwell52-ai/codeflowmu-open/dev-test-and-explain)
Your own site
<a href="https://agentmods.dev/skills/joinwell52-ai/codeflowmu-open/dev-test-and-explain"><img src="https://agentmods.dev/badge/skills/joinwell52-ai/codeflowmu-open/dev-test-and-explain.svg" alt="Measured on agentmods" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 181 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 $0.00044 $0.00181
Opus 5 $0.00022 $0.00090
Sonnet 5 $0.00009 $0.00036
Haiku 4.5 $0.00004 $0.00018

Measured 4d ago against content hash 1add218d1efc, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

dev-test-and-explain 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 4d 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/dev-test-and-explain/SKILL.md · 37 lines

What it actually says

DEV Test and Explain

When to use

Use after implementation and before reporting.

Rules

  • Run relevant tests when feasible.
  • Say when tests cannot run.
  • Summarize evidence and residual risk.
  • Do not invent output.

Required output

Use docs/skills/dev-playbook/test-and-explain.md.

Forbidden actions

  • Do not claim unrun tests passed.
  • Do not hide failed tests.
  • Do not archive after reporting unless authorized.

Minimal example

Command: npm test
Result: failed
Reason: unrelated existing fixture missing
Next: PM decide whether to split fix
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. 4d ago First seen · 37 lines · 44 tokens per session scan A 1add218d1efc

Subscribe to this mod's changes

dev-test-and-explain is a skill published in the GitHub repository joinwell52-AI/CodeFlowMu-open (2 stars, last pushed 11d ago), licensed MIT. It adds 44 tokens to every session and 181 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 2026-08-31.