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ksail: Skill for Claude Code

.agents/skills/test-driven-development/SKILL.md

test-driven-development is a skill for Claude Code, Codex from devantler-tech/ksail. It costs 17 tokens per session (2,414 once invoked), scanned A, original, no licence file.

A development practice that starts with a test for a feature or bug fix, then adds the code needed to pass it. TDD means test-driven development.

In plain words
What is it for?
Implementing new features and fixing bugs with tests written before the implementation.
Why use it?
It provides a required testing-first workflow before implementation code is written.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

This is devantler-tech/ksail's own configuration. It tells Claude Code and Codex how to work on ksail itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything ksail configures →

not rated 164repo changed 1mo ago A scan 17 tokens custom licence
View source ↗ devantler-tech/ksail ksail.devantler.tech
Reuse

Borrowing it

Nothing to install: this file belongs to devantler-tech/ksail. 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/devantler-tech/ksail/main/.agents/skills/test-driven-development/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/devantler-tech/ksail

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 test-driven-development

README.md
[![agentmods](https://agentmods.dev/badge/skills/devantler-tech/ksail/test-driven-development/github.svg)](https://agentmods.dev/skills/devantler-tech/ksail/test-driven-development)
Your own site
<a href="https://agentmods.dev/skills/devantler-tech/ksail/test-driven-development"><img src="https://agentmods.dev/badge/skills/devantler-tech/ksail/test-driven-development/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 test-driven-development

Your own site · 80×15
<a href="https://agentmods.dev/skills/devantler-tech/ksail/test-driven-development"><img src="https://agentmods.dev/badge/skills/devantler-tech/ksail/test-driven-development.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,414 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 $0.00017 $0.02414
Opus 5.5 $0.00007 $0.00966
Sonnet 5.5 $0.00003 $0.00483
Haiku 4.5 $0.00002 $0.00241

Measured 1mo ago against content hash ab5d168f176a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

test-driven-development 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 1mo 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/skills/test-driven-development/SKILL.md · 336 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

1 file 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. 1mo ago Changed · +10 lines ab5d168f176a
  2. 1mo ago Changed · +1 lines 078ac7e67aed
  3. 2mo ago First seen · 325 lines · 17 tokens per session scan A 32b49218fe4c

Subscribe to this mod's changes

test-driven-development is a skill published in the GitHub repository devantler-tech/ksail (164 stars, last pushed yesterday), with no licence file. It adds 17 tokens to every session and 2,414 once invoked, about $0.0001 per session on Opus 5.5. 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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Related

test-driven-development compared with skills from other repositories

test-driven-development next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
test-driven-developmentdevantler-tech/ksailSkill164yesterdaynoneA17Claude Code, Codex
codew-release-qa-sweepHmbown/CodeWhaleSkill41k5d agoMITA31Claude Code, Codex
cw-gatesHmbown/CodewhaleSkill41k1mo agoMITA48Claude Code, Codex
webapp-testingHmbown/CodeWhaleSkill41k5d agoMITA32Claude Code, Codex
skillshare-implement-featurerunkids/skillshareSkill2.9kyesterdayMITA114Claude Code
productskillmds/skillmdSkill1893d agoMITA13Claude Code
vs-chatvolcengine/SearchCLISkill1.2k21d agoApache-2.0A22Claude Code, Codex