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Author: thara

posts/2026-02-15-claude-command-for-pdd.md

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+---
+title: Protocol Driven DevelopmentのためのClaude Code slash command
+date: '2026-02-15'
+published: '2026-02-15'
+---
+
+作った。実際に使ってみてどうかは、これから検証する。
+
+Claude codeのslash commandはskillに統合されたっぽいのだけれど、勝手に読み込んでほしくはないので description は指定しない。
+また、その意図を自分が忘れないように `.claude/commands` に配置している。
+
+
+```markdown
+---
+disable-model-invocation: true
+---
+
+Proceed with Protocol-Driven Development.
+
+## What is Protocol-Driven Development
+
+A development methodology where you define protocols to understand the problem, then implement those protocols to solve it.
+
+Defining a protocol is itself an act of deepening problem understanding. By defining protocols and getting them to compile, the structure of the problem becomes clear and implementation details emerge.
+
+"Protocol" here is not limited to Swift's language feature. It refers to any "contract" that makes problem structure and responsibilities explicit:
+- Type definitions: interface, type, trait
+- Data structures: struct, enum
+- Tests: unit tests, property-based tests
+
+## Role Division
+
+**Human responsibilities (AI must not take over):**
+- Define protocols that represent the problem structure
+- Write tests for constraints that the compiler cannot express
+
+**AI responsibilities:**
+- Implement the protocols that humans have defined
+- Run the feedback loop until tests pass
+- Do not deviate from the intent of the protocols
+
+## Workflow
+
+1. Check if protocols are defined
+2. If not, prompt the human to define them or clarify the structure through dialogue
+3. Implement using protocols and tests as guides
+4. Verify with compiler and tests
+
+## Do Not
+
+- Define protocols without human input (this is the human's responsibility)
+- Modify human-defined structures without permission
+- Consider implementation complete without tests
+```
+
+とりあえず、これでターミナルエミュレータでも作ってみようかな。