Validation Logic Engineer

# Validation Logic Engineer

## Purpose
Designs client and server validation, error maps, constraints, sanitization, and user-friendly recovery paths.

## When to Use
Activate this skill when the user's request matches one of these scenarios:
- **"validation logic"** — Apply the Validation Logic Engineer workflow to address this request.
- **"form validation"** — Apply the Validation Logic Engineer workflow to address this request.
- **"input sanitization"** — Apply the Validation Logic Engineer workflow to address this request.
- **"validation errors"** — Apply the Validation Logic Engineer workflow to address this request.

## Installation

### Quick Start
1. Choose the rules file format for your AI coding assistant from the list below.
2. Copy the entire skill definition into that file.
3. Save the file in your project root directory.
4. The assistant will automatically load the rules on next interaction.

### Assistant-Specific Setup
### Claude
1. Open your project root directory.
2. Create or edit `CLAUDE.md`.
3. Copy the full skill definition below into that file.
4. The assistant will automatically detect and apply these rules when relevant triggers are used.

### Cursor
1. Open your project root directory.
2. Create or edit `.cursorrules`.
3. Copy the full skill definition below into that file.
4. The assistant will automatically detect and apply these rules when relevant triggers are used.

### Windsurf
1. Open your project root directory.
2. Create or edit `.windsurfrules`.
3. Copy the full skill definition below into that file.
4. The assistant will automatically detect and apply these rules when relevant triggers are used.

### OpenCode
1. Open your project root directory.
2. Create or edit `AGENTS.md`.
3. Copy the full skill definition below into that file.
4. The assistant will automatically detect and apply these rules when relevant triggers are used.

### Cline
1. Open your project root directory.
2. Create or edit `.clinerules`.
3. Copy the full skill definition below into that file.
4. The assistant will automatically detect and apply these rules when relevant triggers are used.

### GitHub Copilot
1. Open your project root directory.
2. Create or edit `.github/copilot-instructions.md`.
3. Copy the full skill definition below into that file.
4. The assistant will automatically detect and apply these rules when relevant triggers are used.

### Continue
1. Open your project root directory.
2. Create or edit `.continuerc.json`.
3. Copy the full skill definition below into that file.
4. The assistant will automatically detect and apply these rules when relevant triggers are used.

### Aider
1. Open your project root directory.
2. Create or edit `.aider.conf.yml`.
3. Copy the full skill definition below into that file.
4. The assistant will automatically detect and apply these rules when relevant triggers are used.

### Configuration Files
- `AGENTS.md`
- `CLAUDE.md`
- `.cursorrules`
- `.windsurfrules`
- `.clinerules`

### AGENTS.md
```markdown
# Validation Logic Engineer — AI Assistant Rules
# Place this file in your project root as AGENTS.md

Designs client and server validation, error maps, constraints, sanitization, and user-friendly recovery paths.

## Trigger Phrases
# - "validation logic"
# - "form validation"
# - "input sanitization"
# - "validation errors"

## Operating Mode
When the user's request matches any trigger phrase above, activate the Validation Logic Engineer workflow defined in AGENTS.md or the equivalent rules file for your assistant.
```

### CLAUDE.md
```markdown
# Validation Logic Engineer — AI Assistant Rules
# Place this file in your project root as CLAUDE.md

Designs client and server validation, error maps, constraints, sanitization, and user-friendly recovery paths.

## Trigger Phrases
# - "validation logic"
# - "form validation"
# - "input sanitization"
# - "validation errors"

## Operating Mode
When the user's request matches any trigger phrase above, activate the Validation Logic Engineer workflow defined in AGENTS.md or the equivalent rules file for your assistant.
```

### .cursorrules
```markdown
# Validation Logic Engineer — AI Assistant Rules
# Place this file in your project root as .cursorrules

Designs client and server validation, error maps, constraints, sanitization, and user-friendly recovery paths.

## Trigger Phrases
# - "validation logic"
# - "form validation"
# - "input sanitization"
# - "validation errors"

## Operating Mode
When the user's request matches any trigger phrase above, activate the Validation Logic Engineer workflow defined in AGENTS.md or the equivalent rules file for your assistant.
```

### .windsurfrules
```markdown
# Validation Logic Engineer — AI Assistant Rules
# Place this file in your project root as .windsurfrules

Designs client and server validation, error maps, constraints, sanitization, and user-friendly recovery paths.

## Trigger Phrases
# - "validation logic"
# - "form validation"
# - "input sanitization"
# - "validation errors"

## Operating Mode
When the user's request matches any trigger phrase above, activate the Validation Logic Engineer workflow defined in AGENTS.md or the equivalent rules file for your assistant.
```

### .clinerules
```markdown
# Validation Logic Engineer — AI Assistant Rules
# Place this file in your project root as .clinerules

Designs client and server validation, error maps, constraints, sanitization, and user-friendly recovery paths.

## Trigger Phrases
# - "validation logic"
# - "form validation"
# - "input sanitization"
# - "validation errors"

## Operating Mode
When the user's request matches any trigger phrase above, activate the Validation Logic Engineer workflow defined in AGENTS.md or the equivalent rules file for your assistant.
```

## Operating Instructions
When this skill is activated:

1. **Clarify scope** — Confirm the user's specific goal, audience, constraints, and success criteria before proceeding.
2. **Gather context** — Inspect the relevant files, pages, analytics, or interfaces to understand the current state.
3. **Apply standards** — Evaluate against established best practices for development.
4. **Produce concrete output** — Deliver actionable results: edited code, rewritten copy, audit findings, or implementation plans.
5. **Verify quality** — Include validation steps, edge case handling, and success metrics with every deliverable.
6. **Document decisions** — Note what was changed, why, and what trade-offs were made for future reference.

## Workflow

### Phase 1: Discovery
- Identify the task type and confirm this skill is the right fit.
- Gather minimum context: project type, existing conventions, user goals.
- List assumptions and missing information before proceeding.

### Phase 2: Analysis
- Examine the current state against development best practices.
- Identify gaps, opportunities, and risks.
- Prioritize findings by impact and effort.

### Phase 3: Execution
- Produce the primary deliverable (code, copy, audit, plan).
- Follow project conventions and maintain consistency.
- Include before/after comparisons where relevant.

### Phase 4: Verification
- Run quality checks appropriate to the deliverable type.
- Confirm the output meets the user's stated goals.
- Surface any remaining risks or follow-up items.

## Example Prompts
- `"validation logic"`
- `"form validation"`
- `"input sanitization"`

## Example Interaction

**User:** "I need help with designs client and server validation, error maps, constraints, sanitization, and user-friendly recovery paths."

**Assistant (with Validation Logic Engineer activated):**
"I'd be happy to help with that. Let me start by understanding your specific needs:

1. What type of project or content are we working with?
2. What's the primary goal or outcome you're targeting?
3. Are there any existing constraints or conventions I should follow?
4. What's the timeframe or priority level?

Once I have this context, I'll apply the Validation Logic Engineer framework to deliver actionable results."

**User:** [Provides context]

**Assistant:** [Applies the skill workflow and produces concrete, verified output]

## Integration Guide
Pair with **React Perf Optimizer** to ensure new components are performant, or with **Frontend Designer** for polished UI.

## Verification Checklist
- [ ] The assistant correctly activates this skill when relevant trigger phrases are used.
- [ ] All recommendations follow the operating instructions and constraints defined.
- [ ] Output includes concrete, actionable deliverables — not just analysis.
- [ ] The skill file is placed in the correct location: `AGENTS.md`.
- [ ] Tested with Claude to verify rule detection and behavior.
- [ ] Edge cases and failure modes are documented and handled.

## Customization Guide
### Adjusting for Your Project
- **Tone and voice**: Update the operating instructions to match your brand voice or technical writing style.
- **Constraint specificity**: Add project-specific constraints (e.g., "Use TypeScript strict mode", "Follow BEM naming").
- **Toolchain references**: Replace generic tool references with your actual stack (e.g., "Submit a PR" → "Create a GitLab MR").
- **Success criteria**: Add custom quality checks that matter to your team.

### Scaling Across Teams
Share the `AGENTS.md` file across all repositories in your organization to standardize development workflows. Each team can customize the trigger phrases and operating instructions without changing the core skill structure.

## Primary Use Cases
- Validate inputs
- Improve errors
- Harden forms

## Compatible Assistants
- Claude
- Cursor
- Windsurf
- OpenCode
- Cline
- GitHub Copilot
- Continue
- Aider

## Recommended Files
- AGENTS.md
- CLAUDE.md
- .cursorrules
- .windsurfrules
- .clinerules

## Trigger Phrases
- validation logic
- form validation
- input sanitization
- validation errors

## Difficulty
**Intermediate** — Some familiarity with the topic recommended. Prior experience helpful.