waterfall-development
Enforces strict waterfall development workflow with phase gates. Use when (1) features.yml exists in project root, (2) user asks to implement/develop/build a feature, (3) user explicitly requests waterfall workflow. Creates features.yml if missing when invoked.
Best use case
waterfall-development is best used when you need a repeatable AI agent workflow instead of a one-off prompt. It is especially useful for teams working in multi. Enforces strict waterfall development workflow with phase gates. Use when (1) features.yml exists in project root, (2) user asks to implement/develop/build a feature, (3) user explicitly requests waterfall workflow. Creates features.yml if missing when invoked.
Enforces strict waterfall development workflow with phase gates. Use when (1) features.yml exists in project root, (2) user asks to implement/develop/build a feature, (3) user explicitly requests waterfall workflow. Creates features.yml if missing when invoked.
Users should expect a more consistent workflow output, faster repeated execution, and less time spent rewriting prompts from scratch.
Practical example
Example input
Use the "waterfall-development" skill to help with this workflow task. Context: Enforces strict waterfall development workflow with phase gates. Use when (1) features.yml exists in project root, (2) user asks to implement/develop/build a feature, (3) user explicitly requests waterfall workflow. Creates features.yml if missing when invoked.
Example output
A structured workflow result with clearer steps, more consistent formatting, and an output that is easier to reuse in the next run.
When to use this skill
- Use this skill when you want a reusable workflow rather than writing the same prompt again and again.
When not to use this skill
- Do not use this when you only need a one-off answer and do not need a reusable workflow.
- Do not use it if you cannot install or maintain the related files, repository context, or supporting tools.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/waterfall-development/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How waterfall-development Compares
| Feature / Agent | waterfall-development | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Enforces strict waterfall development workflow with phase gates. Use when (1) features.yml exists in project root, (2) user asks to implement/develop/build a feature, (3) user explicitly requests waterfall workflow. Creates features.yml if missing when invoked.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
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SKILL.md Source
# Waterfall Development Strict phase gate enforcement for waterfall workflow. Requires the `feature-file` skill for artifact management. ## Phases Requirements → Design → Implementation → Testing → Complete ## Activation | Condition | Action | |-----------|--------| | features.yml exists | Activate, validate gates | | User invokes skill, no features.yml | Create features.yml via feature-file skill, then activate | | No features.yml, not invoked | Do not activate | ## Workflow 1. Run `./scripts/validate-gates.py` 2. If errors: Print errors, STOP 3. Identify target feature and current phase 4. Block work that doesn't match current phase 5. Before phase transitions: Re-validate target phase gates ## Gates See references/phase-gates.md for fix instructions. | Gate | Transition | Criteria | |------|------------|----------| | G1 | → Design | Feature has ≥1 requirement | | G2 | → Design | All requirements have descriptions | | G3 | → Implementation | decisions field exists | | G4 | → Testing | All requirements In-Progress or Complete | | G5 | → Complete | All requirements Complete + tested-by + all tests passing | ## Agent Usage Use sub-agents for verification tasks that require codebase exploration: **Before Design phase**: Verify requirements are complete by examining codebase and user request for implicit requirements. **Before Complete phase**: Verify test coverage by checking all requirements have corresponding tests and tested-by references. ## Error Handling Gate failures print terse errors. No bypass mechanism.
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