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ClaudSkills / Product / prd-spec

Do Reverse Spec

Category: Product  ·  Sub-category: prd-spec  ·  Last updated:
lang:ruby
ALWAYS use when extracting functional specifications from existing code that lacks documentation. Supports two perspectives: (1) product-feature specs that analyze multiple source files to describe a product capability from the user's viewpoint, and (2) module-level technical specs for binary formats, protocols, state machines, algorithms, or APIs. Works with natural language ('로직 제어 기능 명세 작성해줘') or slash command arguments. ALWAYS use when user mentions: 역공학 명세, reverse engineering spec, 코드 기반 명세, code-based specification, 기능 명세 추출, extract functional spec, 바이너리 구조 명세, binary structure spec, 프로토콜 명세, protocol specification, 상태 머신 명세, state machine spec, 알고리즘 명세, algorithm specification, 코드에서 문서 생성, generate docs from code, 설계 의도 추출, design intent extraction, 명세서 역공학, spec reverse engineering, 제품 기능 명세, product feature spec, 기능 사양서, functional specification, 동작 명세, behavior specification, 코드 분석 후 명세 작성, 기능 스펙 문서, 사양서 작성. Do NOT use for: API header documentation (use do-apidoc), code quality audit (use plan-quality-audit), data flow tracing without spec output (use plan-dataflow), or designing new function contracts from scratch (use plan-function-spec).

From the source SKILL.md

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What this skill does

Do Reverse Spec is a community-contributed Claude Code skill in the prd-spec sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/do-reverse-spec/ and loads when your prompt matches the skill's trigger.

When to invoke it: use when extracting functional specifications from existing code that lacks documentation. Supports two perspectives: (1) product-feature specs that analyze multiple source files to describe a product capability from the user's viewpoint, and (2) module-level technical specs for binary formats, protocols, state machines, algorithms, or APIs.

Who uses this skill

The Do Reverse Spec Claude Code skill is built for product managers, product designers, and cross-functional teams planning, shipping, and measuring product features. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 69,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/do-reverse-spec
curl -L https://claudskills.com/skills/do-reverse-spec/SKILL.md \
  -o ~/.claude/skills/do-reverse-spec/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/do-reverse-spec/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/do-reverse-spec/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\do-reverse-spec\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

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See pricing → Download desktop app

Attribution & license

More Product skills

Browse all Product skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Product skills → Top 100 skills
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