secure-tdd

secure-tdd is a skill for Claude Code from jaimevalasek/aioson. It costs 28 tokens per session (525 once invoked), scanned A, original, AGPL-3.0.

A focused process for using adversarial test-driven development, or TDD, when code is exposed to a sensitive attack surface. TDD means writing tests as part of developing the code.

In plain words
What is it for?
Use it for security-sensitive features when an active plan or concrete evidence identifies an attack surface.
Why use it?
It combines security-focused challenge scenarios with a test-first development process for risks that have been identified in a plan or PRD.

Skill for Claude Code

Written for Claude Code: paths in frontmatter.

Good fit Use it for security-sensitive features when an active plan or concrete evidence identifies an attack surface.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jaimevalasek/aioson/secure-tdd
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.

Any agent
npx skills add jaimevalasek/aioson --skill secure-tdd
Clone the repo
git clone --depth 1 https://github.com/jaimevalasek/aioson

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.

agentmods badge for secure-tdd

README.md
[![agentmods](https://agentmods.dev/badge/skills/jaimevalasek/aioson/secure-tdd/github.svg)](https://agentmods.dev/skills/jaimevalasek/aioson/secure-tdd)
Your own site
<a href="https://agentmods.dev/skills/jaimevalasek/aioson/secure-tdd"><img src="https://agentmods.dev/badge/skills/jaimevalasek/aioson/secure-tdd/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for secure-tdd

Your own site · 80×15
<a href="https://agentmods.dev/skills/jaimevalasek/aioson/secure-tdd"><img src="https://agentmods.dev/badge/skills/jaimevalasek/aioson/secure-tdd.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 525 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00028 $0.00525
Opus 5 $0.00014 $0.00262
Sonnet 5 $0.00006 $0.00105
Haiku 4.5 $0.00003 $0.00052

Measured 5d ago against content hash da4d592e914e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

secure-tdd 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 5d 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.

template/.aioson/skills/process/secure-tdd/SKILL.md · 41 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

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.

  1. 5d ago First seen · 41 lines · 28 tokens per session scan A da4d592e914e

Subscribe to this mod's changes

secure-tdd is a skill published in the GitHub repository jaimevalasek/aioson (24 stars, last pushed yesterday), licensed AGPL-3.0. It adds 28 tokens to every session and 525 once invoked, about $0.0001 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 2026-09-03.