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.
npx agentmods add skills/dork-labs/dorkos/test-driven-developmentnpx skills add dork-labs/dorkos --skill test-driven-developmentgit clone --depth 1 https://github.com/dork-labs/dorkosWrote 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.
[](https://agentmods.dev/skills/dork-labs/dorkos/test-driven-development)<a href="https://agentmods.dev/skills/dork-labs/dorkos/test-driven-development"><img src="https://agentmods.dev/badge/skills/dork-labs/dorkos/test-driven-development.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00017 | $0.01443 |
| Opus 5 | $0.00009 | $0.00722 |
| Sonnet 5 | $0.00003 | $0.00289 |
| Haiku 4.5 | $0.00002 | $0.00144 |
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 today.
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.
How it starts
The opening of the file, as written. The whole thing — 152 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Test-Driven Development (TDD)
Overview
Write the test first. Watch it fail. Write minimal code to pass.
Core principle: If you didn't watch the test fail, you don't know if it tests the right thing.
Violating the letter of the rules is violating the spirit of the rules.
When to Use
Always: new features, bug fixes, refactoring, behavior changes.
Exceptions (ask the user): throwaway prototypes, generated code, configuration files.
Thinking "skip TDD just this once"? Stop. That's rationalization.
The Iron Law
NO PRODUCTION CODE WITHOUT A FAILING TEST FIRST
Write code before the test? Delete it. Start over. Don't keep it as "reference", don't "adapt" it while writing tests — delete means delete. Implement fresh from tests.
Red-Green-Refactor
RED — Write Failing Test
One minimal test showing what should happen: one behavior, a name that describes it, real code under test (mocks only if unavoidable — a test that only exercises vi.fn() chains tests the mock, not the code).
Verify RED — Watch It Fail
MANDATORY. Never skip.
pnpm vitest run path/to/test.test.ts
Confirm:
- Test fails (not errors)
- Failure message is the one you expected
- It fails because the feature is missing (not a typo or bad import)
Test passes? You're testing existing behavior — fix the test. Test errors? Fix the error and re-run until it fails correctly.
GREEN — Minimal Code
Write the simplest code that passes the test. No extra options, no speculative parameters, no refactoring other code, no "improvements" beyond what the test demands (YAGNI).
Verify GREEN — Watch It Pass
MANDATORY.
pnpm vitest run path/to/test.test.ts
Confirm: the test passes, other tests still pass, output is pristine (no errors or warnings).
Test fails? Fix the code, not the test. Other tests fail? Fix now.
REFACTOR — Clean Up
After green only: remove duplication, improve names, extract helpers. Keep tests green. Don't add behavior. Then repeat with the next failing test.
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.
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.
- today First seen · 152 lines · 17 tokens per session scan A a659ad36ef99
test-driven-development is a skill published in the GitHub repository dork-labs/dorkos (9 stars, last pushed today), licensed MIT. It adds 17 tokens to every session and 1,443 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.
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