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Force Claude Code to work like a senior developer: plan before coding, work in isolation, write tests first, and review its own output twice before presenting it.
Passed 17 of 22 test cases with the skill, and 10 of 22 without it.
and 8 more in the full report
8 fixed9 passed either way4 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.
During Stage 3 of superpowers mode, you wrote tests and implementation for an email parser. When running the tests, one unit test fails. What action must be taken?
| Checked | Without skill | With skill |
|---|---|---|
| Directs modifying implementation code rather than test code. | Missed | Passed |
The instructions your model reads when the skill loads.
Stop Claude from shipping the first thing it writes. Superpowers mode locks Claude into four stages — Plan, Isolate, Test First, Double Review — so that what it presents at the end is actually right.
The default problem: Claude sprints out of the gate, writes the whole thing in one shot, and it looks great — until someone runs it. It doesn't plan. It doesn't test. It doesn't verify. The result: code that breaks on edge cases, debugging rounds that burn tokens, and rework that costs more than doing it right the first time.
Credit: Inspired by a skill from Nate Herk's YouTube channel — adapted and extended for this library.
No inputs required. Superpowers activates on command, then applies to whatever coding task follows.
Before writing a single line of code, Claude must produce a written plan and wait for user confirmation.
Plan format:
PLAN
════
TASK
[One-sentence restatement of what was asked. If anything is ambiguous, flag it here before proceeding.]
APPROACH
[2–4 sentences describing the implementation approach and key decisions. If there are multiple valid approaches, briefly explain why this one was chosen.]
FILES TO CREATE OR MODIFY
- [path/to/file.ts] — [what changes: create / modify / delete — one line reason]
- [path/to/file.ts] — [what changes]
EDGE CASES I WILL HANDLE
- [Edge case 1]
test cases passed, vs 10 / 22 without
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