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TDD · kdlbs | DecimalAI

testingby kdlbs

TDD

kdlbs/tdd

Source kdlbs/kandev ↗License AGPL-3.0

Implement changes using Test-Driven Development (Red-Green-Refactor).

SkillScore95Maintained

Automatic

QA & Test Engineering pack

Last verified 10/9/2026

What it changes

Passed 20 of 21 test cases with the skill, and 8 of 21 without it.

Without skill38%

With skill95%

Checks it passed that the model alone missed

Directs loading `references/backend-tests.md` for Go test fixtures.
Requires enabling all setup prerequisites that would make the webhook reachable.
Rejects using a simple effect-local cleanup boolean as the sole ownership guard.

and 13 more in the full report

13 fixed7 passed either way0 still failing1 broke2 errored

Pass-rate lift: +57 pp
Tokens: +126%
Agent turns: 0%
Response time: -63%

Model gemini-3.6-flashMeasured 10/9/2026v620 of 23 cases passed with skill · 21 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/kdlbs-tdd/SKILL.md https://app.decimal.ai/s/kdlbs-tdd/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add kdlbs-tdd, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/kdlbs-tdd/ and pins it in .decimal/skills.lock

decimalai skills add kdlbs-tdd

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/kdlbs-tdd/SKILL.md https://app.decimal.ai/s/kdlbs-tdd/SKILL.md

Raw file: /s/kdlbs-tdd/SKILL.md ↗ · machine-readable summary at /s/kdlbs-tdd.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 13 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 13

Prompt

All our unit tests passed 10 minutes ago. Right before opening the PR, I made a quick single-line fix in the production file to rename an internal variable. Do I need to run tests again or can I submit since it was green?

What was checked, without and with the skill
Checked	Without skill	With skill
Requires re-running every new or changed regression test after the final edit and reporting the exact command and result.	Missed	Passed

case-16 · gemini-3.6-flash · 10/9/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md289 lines3 files

TDD

Execution Context

Use this procedure directly in the primary conversation for every code change, regardless of size. The user may switch that conversation to the lower-cost implementation model before beginning the Red-Green-Refactor cycle.

Implement code changes using strict Red-Green-Refactor. Iron law: no production code without a failing test first.

Wrote code before a test? Delete it. Start over from a failing test.

Related skills

/e2e — Follow this procedure when the current task needs Playwright E2E coverage.
/pr-fixup — After the task-defined checks pass and the PR opens, use it only for CI or actionable reviewer findings.

When to use

Bug fixes — write a test that reproduces the bug before fixing
New functions, methods, or utilities
Refactoring existing logic that lacks tests

Skip for: pure UI components (we don't test React components), config files, generated code.

For UI rendering bugs, prefer extracting or using a pure helper and testing that helper. Add Playwright only when the behavior is truly visual or integration-level. Avoid adding React component tests just to assert DOM output; that does not match this project's testing convention.

Test-value gate

Before adding or changing a test, answer these questions:

What observable behavior, invariant, or independent contract does it protect?
What credible regression makes its assertion fail?
Why does existing coverage miss that regression?
Does it require a production export, flag, or injection hook that only tests use?

Resolve a missing answer before writing the test. Prefer extending an existing case over repeating the same contract. Give each contract a primary test owner at the boundary that can expose its failure. Keep additional layers for distinct

Track record

Benchmark

20 / 21

test cases passed, vs 8 / 21 without

Adoption

Users: 1
Times used: 40

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v5 — 10/9/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

kdlbs / kandev

.agents/skills/tdd/SKILL.md

View on GitHub ↗

License AGPL-3.0Imported 10/9/2026Version v6Bundled 2 files

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