A skill for adding or changing automated tests for a Hedron slice, such as a system decision, handler, use-case flow, persistence round-trip, or architecture rule.

Writing tests that check domain decisions, coordination, complete flows, saved-and-restored data, and architectural constraints.

It helps choose the appropriate test level and shared test setup, while identifying cases that should be tested or deliberately skipped.

How dmbyer/Hedron configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to dmbyer/Hedron. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/dmbyer/Hedron/master/.claude/skills/add-tests/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/dmbyer/Hedron

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/dmbyer/hedron/add-tests.svg)](https://agentmods.dev/skills/dmbyer/hedron/add-tests)

Your own site

<a href="https://agentmods.dev/skills/dmbyer/hedron/add-tests"><img src="https://agentmods.dev/badge/skills/dmbyer/hedron/add-tests.svg" alt="Measured on agentmods" height="20"></a>

Per session 101 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,502 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 unknown 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.

Model	Per session	Once invoked
Fable 5.1	$0.00101	$0.02502
Opus 5	$0.00051	$0.01251
Sonnet 5	$0.00020	$0.00500
Haiku 4.5	$0.00010	$0.00250

Measured 7d ago against content hash 4fea922873ea, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

add-tests 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 7d 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.

.claude/skills/add-tests/SKILL.md · 97 lines

The source is not reproduced here

No licence file

Read it on GitHub

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.

7d ago First seen · 97 lines · 101 tokens per session scan A 4fea922873ea

Subscribe to this mod's changes

add-tests is a skill published in the GitHub repository dmbyer/Hedron (11 stars, last pushed 21d ago), with no licence file. It adds 101 tokens to every session and 2,502 once invoked, about $0.0005 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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Hedron: Skill for Claude Code