Imported from majiayu000/claude-skill-registry-data (ai-llm/prompt-architect/SKILL.md). Install upstream with npx skills add majiayu000/claude-skill-registry-data --skill prompt-architect. Copyright stays with the author.

Prompt Architect

Create and enhance production-ready prompts. Diagnose what's needed, output only what serves that need - no fixed templates, no bloat.

Phase 1: Detect Mode

Phase 2: Diagnosis

2.1 Classify Type

2.2 Assess Complexity

• Simple: Single clear task → Minimal output
• Moderate: Some ambiguity → Light structure
• Complex: Deep expertise, high stakes → Full architecture

2.3 Identify Gaps

2.4 For Enhance Mode: What's Working?

Before changing anything, identify what to preserve:

• Role that grounds the prompt? → Keep, enhance
• Structure that makes sense? → Keep
• Constraints that are clear? → Keep
• Voice that's appropriate? → Keep

Key rule for agents/personas: If input has role, output must have role. Enhance it, don't remove it.

Phase 3: Technique Selection

Apply techniques only when triggered:

Prompting Techniques Reference

Chain-of-Thought (CoT)

• Use for: Complex reasoning, math problems, logical deduction
• Implementation: Add "think step by step" or "show your reasoning"

Few-Shot Learning

• Use for: Pattern-based tasks, specific formatting, consistent outputs
• Implementation: Include 2-3 examples showing input-output pairs

ReAct (Reasoning + Acting)

• Use for: Tool use, multi-step tasks, decision-making
• Implementation: Combine reasoning traces with action steps

Role-Based Prompting

• Use for: Domain-specific expertise, perspective-taking
• Implementation: Assign expert role with specific approach

Phase 4: Building Blocks

Include only what serves the task. No fixed template.

Deciding What to Include

Block Templates

Role Block - When identity matters:

<role>
You are [specific identity with credibility].

Your approach: [perspective/methodology that shapes how you work]
</role>

Voice Block - When communication style matters:

<voice>
Tone: [specific tone]
Style: [communication patterns]
Boundaries: [what this voice won't do]
</voice>

Objective Block - When deliverable matters:

<objective>
[Clear statement: what to accomplish, why it matters]
</objective>

<success_criteria>
[How to know it's done well]
</success_criteria>

Mental Models Block - When expertise matters (PREFERRED over Patterns):

<mental_models>
**[Lens Name]**
Experts think in terms of: [conceptual framework - the abstraction they use]
Questions they ask: [generative questions that surface insights in ANY scenario]
Core tension: [underlying tradeoff or dynamic that defines the domain]
This lens reveals: [what becomes visible through this frame]
</mental_models>

Why Mental Models > Patterns:

• Patterns are prescriptive: Your examples become the ceiling of what the agent can do
• Mental Models are generative: Your lenses become the floor from which the agent reasons upward
• Mental Models let agents handle situations you never anticipated by asking the right questions, not matching against your answers

Patterns Block (Legacy - Only for procedural checklists):

<patterns>
**[Pattern Name]**
When you see: [trigger]
This indicates: [insight - what expert knows]
Therefore: [action]
Watch out for: [pitfall]
</patterns>

When to use Mental Models vs Patterns:

• Mental Models: Deep expertise, judgment-heavy domains (security, architecture, strategy, legal, consulting)
• Patterns: Procedural knowledge where triggers → actions (compliance checklists, linting rules, mechanical validations)

Heuristics Block - When judgment matters (simple rules):

<heuristics>
- [Rule of thumb]: [when/why it applies]
- [Rule of thumb]: [when/why it applies]
</heuristics>

Thinking Approaches Block - When reasoning matters (PREFERRED over Heuristics for complex domains):

<thinking_approaches>
**[Approach Name]**
The question experts ask: [generative question that guides reasoning]
What this surfaces: [insights the question reveals]
Apply when: [context for this approach]
</thinking_approaches>

Why Thinking Approaches > Heuristics:

• Heuristics constrain conclusions: "If X, then Y"
• Thinking Approaches guide reasoning: "Ask this question to discover Y"
• Thinking Approaches transfer across scenarios; heuristics only match specific cases

Rules Block - When boundaries matter:

<always>
- [Must do]: [why]
</always>

<never>
- [Must not]: [what it prevents]
</never>

<when>
- [Condition]: [behavior]
</when>

Anti-Patterns Block - When mistakes are costly:

<anti_patterns>
**[Mistake Name]**
Looks like: [how it manifests]
Why wrong: [harm it causes]
Instead: [correct approach]
</anti_patterns>

Output Block - When format matters:

<o>
[Format/structure of deliverable]
</o>

Phase 5: Key Transformations

Patterns → Mental Models (Prescriptive → Generative)

Transform when expertise needs to transfer, not just specific scenarios.

Before (Prescriptive - Patterns):

<patterns>
**Auth Bypass**
When you see: Login, session, password reset flows
This indicates: Identity establishment - where can it be forged?
Therefore: Check race conditions, token predictability, session fixation
Watch out for: "Secure" libraries used incorrectly
</patterns>

Problem: Agent can only handle login/session/password scenarios you listed.

After (Generative - Mental Models):

<mental_models>
**Trust Boundaries**
Experts think in terms of: Where does trust transition happen? (user→system, service→service, stored→executed)
Questions they ask: "What proves identity here? Can that proof be forged, replayed, or bypassed?"
Core tension: Convenience vs. verification rigor
This lens reveals: Attack surfaces at every trust transition, not just obvious auth endpoints
</mental_models>

Result: Agent applies this lens to ANY scenario - OAuth, API keys, service accounts, file uploads with embedded scripts - including ones you never anticipated.

Procedure → Patterns (still useful for checklists)

Transform when you need procedural knowledge but with expert insight.

Before:

1. Check authentication
2. Check authorization
3. Check input validation

After:

<patterns>
**Auth Bypass**
When you see: Login, session, password reset flows
This indicates: Identity establishment - where can it be forged?
Therefore: Check race conditions, token predictability, session fixation
Watch out for: "Secure" libraries used incorrectly

**Privilege Escalation**
When you see: Role checks, ownership validation
This indicates: Authorization boundary - can low reach high?
Therefore: Test IDOR, vertical escalation, role manipulation
</patterns>

Generic → Specific

Before: "Be professional"

After:

<voice>
Tone: Direct, confident, not hedging
Style: Short sentences, active voice, specific examples
Boundaries: Don't over-explain obvious concepts
</voice>

Verbose → Focused

Remove redundancy, preserve substance, keep roles for agents/personas.

Before:

You are a helpful assistant. You help users. Always be helpful and professional.
Try to help. Be respectful and polite. Your goal is to assist users.

After:

<role>
You are an assistant who [specific value you provide].

Your approach: [how you help - be specific]
</role>

<always>
- [Specific actionable behavior]
</always>

Phase 6: Token Optimization

When reducing output tokens (API costs) while maintaining functionality:

Core Strategy: Compact Output + Server-Side Remapping

LLM generates ultra-compact format, application remaps to original format.

Techniques:

When to Apply:

• High-volume API usage (>1000 requests/day)
• Output tokens are >50% of total costs
• Schema is stable and well-defined

When NOT to Apply:

• Low-volume usage
• Human readability critical
• No application layer for remapping

Token Optimization Example

Before (Original):

{"queries":[{"keyword":"milk","filter":"category=dairy","sort_by":"relevant"}]}

After (60% smaller):

{"q":[{"kw":"milk","f":"c=c8"}]}

Application remaps to original format for clients.

Phase 7: Validation

Before output, verify:

Structure

• Every section earns its place
• No redundancy
• Complexity matches task

Content

• Language specific and actionable
• Sounds like practitioner
• Patterns have insight (not just steps)

Expertise Transfer (Critical for Expert/Skill prompts)

• The Expert Test: Could an expert in this domain look at your prompt and say "yes, that's how I think" - or would they say "that's a checklist someone made about my field"?
• Mental Models give lenses not answers
• Questions are generative (apply to unseen scenarios), not just triggers for known patterns

Preservation (Enhance mode)

• If input had role → output has role
• Original intent preserved
• User's structure respected

Effectiveness

• Adds clear value (if not, don't change)
• Works across platforms

Phase 8: Output

Return prompt directly:

• No wrapper
• No meta-commentary unless asked
• Directly usable

If already good: Say so. Don't add bloat. Maybe note one optional improvement.

If unclear: Ask ONE clarifying question.

Examples

Example 1: Create - Agent Prompt

Input: "Create a prompt for a research assistant"

Mode: Create | Type: Agent | Needs: Role, capabilities, judgment, boundaries

Output:

<role>
You are a research assistant who finds accurate information and synthesizes it clearly.

Your approach: Verify across sources, prioritize authoritative sources, distinguish facts from opinions. When uncertain, say so.
</role>

<capabilities>
- Web search for current information
- Synthesize multiple sources
- Identify gaps and conflicts in information
</capabilities>

<heuristics>
- Prefer primary sources over summaries
- If top results conflict, dig deeper
- Recent isn't always better - check for authoritative older sources
</heuristics>

<always>
- Cite sources for factual claims
- Note confidence level (established vs. preliminary)
</always>

<never>
- Present speculation as fact
- Rely on single source for important claims
</never>

Example 2: Enhance - Agent Prompt with Mental Models

Input: "Improve this: You are a code review assistant. Review code and find bugs."

Mode: Enhance | Type: Agent | Gaps: Vague role, no mental models, no judgment

Output:

<role>
You are a code review assistant focused on quality, security, and maintainability.

Your approach: Find issues that matter, not style nitpicks. Think like a maintainer who'll debug this at 2am.
</role>

<mental_models>
**Cognitive Load**
Experts think in terms of: How much must someone hold in their head to understand this code?
Questions they ask: "If I'm debugging this at 2am, what will trip me up?"
Core tension: Abstraction (hiding complexity) vs. explicitness (seeing what happens)
This lens reveals: Functions doing too much, unclear naming, hidden control flow, magic values

**Trust Boundaries**
Experts think in terms of: Where does data cross from untrusted to trusted contexts?
Questions they ask: "What assumptions am I making about this input? Can those assumptions be violated?"
Core tension: Defensive coding vs. code simplicity
This lens reveals: Injection risks, validation gaps, assumption violations

**Failure Modes**
Experts think in terms of: What happens when things go wrong, not just when they go right?
Questions they ask: "If this fails, will anyone know? Will they know why?"
Core tension: Happy path clarity vs. error path robustness
This lens reveals: Silent failures, swallowed exceptions, missing error context
</mental_models>

<thinking_approaches>
**The Naming Test**
Question experts ask: "Can I name this thing in 3 words without 'and'?"
What this surfaces: Violated single responsibility, unclear purpose
Apply when: Reviewing functions, classes, modules

**The Test Setup Test**
Question experts ask: "How much scaffolding do I need to test this in isolation?"
What this surfaces: Coupling problems, hidden dependencies
Apply when: Evaluating testability and architecture
</thinking_approaches>

<o>
Each issue: location, mental model applied, severity (critical/major/minor), specific fix
</o>

Why this works: The agent can now identify issues in code patterns you never listed—because it's asking the right questions about cognitive load, trust, and failure modes, not just matching against your specific triggers.

Example 3: Create - Simple Task (No Role)

Input: "Create a prompt to convert CSV to JSON"

Mode: Create | Type: Task | Needs: Objective, format, edge cases

Output:

<objective>
Convert CSV data to JSON, preserving all values and structure.
</objective>

<o>
JSON array of objects. Each object = one row.
Keys = header names (preserve spelling/casing)
Values = cell contents as strings (null for empty)
</o>

<when>
- No header row: Use "col_0", "col_1" as keys
- Empty file: Return []
- Malformed CSV: Report error, attempt best-effort if possible
</when>

No role needed. Task-focused. Clean.

Example 4: Enhance - Already Good

Input:

Improve this:
<role>
Technical documentation writer for developer APIs.
Approach: Start with what reader needs, minimal info, assume competence.
</role>

<always>
- Lead with common use case
- Working code example for every endpoint
</always>

<never>
- Use "simply" or "just"
</never>

Mode: Enhance | Assessment: Already good

Output:

This prompt is production-ready. Clear role, specific rules, domain awareness.

Optional addition:

<when>
- Deprecated features: Mark clearly, explain migration, state timeline
- Multiple approaches: Lead with recommended, note alternatives
</when>

But core is solid as-is.

Example 5: Rules Only (No Role)

Input: "Improve: Always respond in JSON"

Mode: Enhance | Type: Rules | Needs: Edge cases, format spec

Output:

<always>
- Valid JSON only, no text outside structure
- Consistent key naming (camelCase)
</always>

<never>
- Markdown code blocks around JSON
- Text before/after JSON
</never>

<when>
- Request unclear: {"error": "clarification needed", "question": "..."}
- Cannot fulfill: {"error": "...", "reason": "..."}
</when>

<o>
{"response": "...", "metadata": {}}
</o>

No role added - this is a formatting rule, not a persona.

Decision Tree Summary

1. What mode?
   - Create from intent
   - Enhance existing

2. What type?
   - Agent/Persona → Role essential
   - Task → Role often optional
   - Rules → No role needed
   - Expert/Skill → Mental models needed (not just patterns)

3. What's needed?
   - Only include sections that serve the task
   - Prefer Mental Models over Patterns for expertise transfer
   - Prefer Thinking Approaches over Heuristics for reasoning

4. What's working? (Enhance mode)
   - Preserve it, don't replace

5. Validate expertise transfer
   - The Expert Test: Would an expert say "that's how I think"?
   - Lenses generate insights; checklists constrain them

6. Output
   - Dynamic structure based on above
   - No fixed template

Status: Production Ready | Lines: ~450