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gemini-superpowers-antigravity: Skill for Claude Code

.agent/skills/superpowers-tdd/SKILL.md

superpowers-tdd is a skill for Claude Code, Codex from anthonylee991/gemini-superpowers-antigravity. It costs 36 tokens per session (239 once invoked), scanned A, original, MIT.

A coding workflow based on test-driven development, or TDD: write a failing test, make it pass, then improve the code. It also adds tests that prevent fixed bugs from returning.

In plain words
What is it for?
Use it to define expected behavior, create focused tests, implement small changes, run relevant tests and linters, and document what the tests prove.
Why use it?
It reduces the chance of breaking existing behavior when adding features, fixing bugs, or restructuring code.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

This is anthonylee991/gemini-superpowers-antigravity's own configuration. It tells Claude Code and Codex how to work on gemini-superpowers-antigravity 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 gemini-superpowers-antigravity configures →

not rated 848repo +2 9mo ago A scan 36 tokens original MIT
View source ↗ anthonylee991/gemini-superpowers-antigravity
Reuse

Borrowing it

Nothing to install: this file belongs to anthonylee991/gemini-superpowers-antigravity. 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/anthonylee991/gemini-superpowers-antigravity/main/.agent/skills/superpowers-tdd/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/anthonylee991/gemini-superpowers-antigravity

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 superpowers-tdd

README.md
[![agentmods](https://agentmods.dev/badge/skills/anthonylee991/gemini-superpowers-antigravity/superpowers-tdd/github.svg)](https://agentmods.dev/skills/anthonylee991/gemini-superpowers-antigravity/superpowers-tdd)
Your own site
<a href="https://agentmods.dev/skills/anthonylee991/gemini-superpowers-antigravity/superpowers-tdd"><img src="https://agentmods.dev/badge/skills/anthonylee991/gemini-superpowers-antigravity/superpowers-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 superpowers-tdd

Your own site · 80×15
<a href="https://agentmods.dev/skills/anthonylee991/gemini-superpowers-antigravity/superpowers-tdd"><img src="https://agentmods.dev/badge/skills/anthonylee991/gemini-superpowers-antigravity/superpowers-tdd.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 239 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 original 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 $0.00036 $0.00239
Opus 5.5 $0.00014 $0.00096
Sonnet 5.5 $0.00007 $0.00048
Haiku 4.5 $0.00004 $0.00024

Measured 2mo ago against content hash 19679fd9e14e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

superpowers-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 2mo 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.

.agent/skills/superpowers-tdd/SKILL.md · 31 lines

What it actually says

TDD Skill

When to use this skill

  • new features that can be unit tested
  • bug fixes (always add a regression test if practical)
  • refactors (protect behavior with tests first)

Rules

  • Prefer red -> green -> refactor.
  • If tests are hard, still add verification: minimal repro script, integration test, or clear manual steps.
  • Keep tests focused: one behavior per test where possible.
  • Name tests by behavior, not implementation details.

Process

  1. Define the behavior change (what should be true after).
  2. Write/adjust a test to capture it (make it fail first if possible).
  3. Implement the minimal change to pass.
  4. Refactor if needed (keep passing).
  5. Run the relevant test suite + any linters.

Output requirements

When you change code, include:

  • what tests you added/changed
  • how to run them
  • what they prove
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. 2mo ago First seen · 31 lines · 36 tokens per session scan A 19679fd9e14e

Subscribe to this mod's changes

superpowers-tdd is a skill published in the GitHub repository anthonylee991/gemini-superpowers-antigravity (848 stars, last pushed 9mo ago), licensed MIT. It adds 36 tokens to every session and 239 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.

TDDTesting
Related

superpowers-tdd compared with skills from other repositories

superpowers-tdd next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
superpowers-tddanthonylee991/gemini-superpowers-antigravitySkill8489mo agoMITA36Claude Code, Codex
engram-testing-coverageGentleman-Programming/engramSkill7.8kyesterdayMITA25Claude Code, Codex
principle-test-behavior-not-implementationmichael-denyer/pstack-claudeSkill4.1kyesterdayMITA50Claude Code
tddcodewithmukesh/dotnet-claude-kitSkill8052d agoMITA81Claude Code
nw-ddd-eventsourcingnWave-ai/nWaveSkill631yesterdayMITA38Claude Code
nw-fp-clojurenWave-ai/nWaveSkill631yesterdayMITA25Claude Code
nw-leanux-methodologynWave-ai/nWaveSkill631yesterdayMITA37Claude Code