---
title: "Senior Prompt Engineer — Agent Skill & Codex Plugin"
description: "This skill should be used when the user asks to 'optimize prompts', 'design prompt templates', 'evaluate LLM outputs', 'build agentic systems'. Agent skill for Claude Code, Codex CLI, Gemini CLI, OpenClaw."
---

# Senior Prompt Engineer

<div class="page-meta" markdown>
<span class="meta-badge">:material-code-braces: Engineering - Core</span>
<span class="meta-badge">:material-identifier: `senior-prompt-engineer`</span>
<span class="meta-badge">:material-github: <a href="https://github.com/alirezarezvani/claude-skills/tree/main/engineering-team/senior-prompt-engineer/SKILL.md">Source</a></span>
</div>

<div class="install-banner" markdown>
<span class="install-label">Install:</span> <code>claude /plugin install engineering-skills</code>
</div>


Prompt engineering patterns, LLM evaluation frameworks, and agentic system design.

## Table of Contents

- [Quick Start](#quick-start)
- [Tools Overview](#tools-overview)
  - [Prompt Optimizer](#1-prompt-optimizer)
  - [RAG Evaluator](#2-rag-evaluator)
  - [Agent Orchestrator](#3-agent-orchestrator)
- [Prompt Engineering Workflows](#prompt-engineering-workflows)
  - [Prompt Optimization Workflow](#prompt-optimization-workflow)
  - [Few-Shot Example Design](#few-shot-example-design-workflow)
  - [Structured Output Design](#structured-output-design-workflow)
- [Reference Documentation](#reference-documentation)
- [Common Patterns Quick Reference](#common-patterns-quick-reference)

---

## Quick Start

```bash
# Analyze and optimize a prompt file
python scripts/prompt_optimizer.py prompts/my_prompt.txt --analyze

# Evaluate RAG retrieval quality
python scripts/rag_evaluator.py --contexts contexts.json --questions questions.json

# Visualize agent workflow from definition
python scripts/agent_orchestrator.py agent_config.yaml --visualize
```

---

## Tools Overview

### 1. Prompt Optimizer

Analyzes prompts for token efficiency, clarity, and structure. Generates optimized versions.

**Input:** Prompt text file or string
**Output:** Analysis report with optimization suggestions

**Usage:**
```bash
# Analyze a prompt file
python scripts/prompt_optimizer.py prompt.txt --analyze

# Output:
# Token count: 847
# Estimated cost: $0.0025 (GPT-4)
# Clarity score: 72/100
# Issues found:
#   - Ambiguous instruction at line 3
#   - Missing output format specification
#   - Redundant context (lines 12-15 repeat lines 5-8)
# Suggestions:
#   1. Add explicit output format: "Respond in JSON with keys: ..."
#   2. Remove redundant context to save 89 tokens
#   3. Clarify "analyze" -> "list the top 3 issues with severity ratings"

# Generate optimized version
python scripts/prompt_optimizer.py prompt.txt --optimize --output optimized.txt

# Count tokens for cost estimation
python scripts/prompt_optimizer.py prompt.txt --tokens --model gpt-4

# Extract and manage few-shot examples
python scripts/prompt_optimizer.py prompt.txt --extract-examples --output examples.json
```

---

### 2. RAG Evaluator

Evaluates Retrieval-Augmented Generation quality by measuring context relevance and answer faithfulness.

**Input:** Retrieved contexts (JSON) and questions/answers
**Output:** Evaluation metrics and quality report

**Usage:**
```bash
# Evaluate retrieval quality
python scripts/rag_evaluator.py --contexts retrieved.json --questions eval_set.json

# Output:
# === RAG Evaluation Report ===
# Questions evaluated: 50
#
# Retrieval Metrics:
#   Context Relevance: 0.78 (target: >0.80)
#   Retrieval Precision@5: 0.72
#   Coverage: 0.85
#
# Generation Metrics:
#   Answer Faithfulness: 0.91
#   Groundedness: 0.88
#
# Issues Found:
#   - 8 questions had no relevant context in top-5
#   - 3 answers contained information not in context
#
# Recommendations:
#   1. Improve chunking strategy for technical documents
#   2. Add metadata filtering for date-sensitive queries

# Evaluate with custom metrics
python scripts/rag_evaluator.py --contexts retrieved.json --questions eval_set.json \
    --metrics relevance,faithfulness,coverage

# Export detailed results
python scripts/rag_evaluator.py --contexts retrieved.json --questions eval_set.json \
    --output report.json --verbose
```

---

### 3. Agent Orchestrator

Parses agent definitions and visualizes execution flows. Validates tool configurations.

**Input:** Agent configuration (YAML/JSON)
**Output:** Workflow visualization, validation report

**Usage:**
```bash
# Validate agent configuration
python scripts/agent_orchestrator.py agent.yaml --validate

# Output:
# === Agent Validation Report ===
# Agent: research_assistant
# Pattern: ReAct
#
# Tools (4 registered):
#   [OK] web_search - API key configured
#   [OK] calculator - No config needed
#   [WARN] file_reader - Missing allowed_paths
#   [OK] summarizer - Prompt template valid
#
# Flow Analysis:
#   Max depth: 5 iterations
#   Estimated tokens/run: 2,400-4,800
#   Potential infinite loop: No
#
# Recommendations:
#   1. Add allowed_paths to file_reader for security
#   2. Consider adding early exit condition for simple queries

# Visualize agent workflow (ASCII)
python scripts/agent_orchestrator.py agent.yaml --visualize

# Output:
# ┌─────────────────────────────────────────┐
# │            research_assistant           │
# │              (ReAct Pattern)            │
# └─────────────────┬───────────────────────┘
#                   │
#          ┌────────▼────────┐
#          │   User Query    │
#          └────────┬────────┘
#                   │
#          ┌────────▼────────┐
#          │     Think       │◄──────┐
#          └────────┬────────┘       │
#                   │                │
#          ┌────────▼────────┐       │
#          │   Select Tool   │       │
#          └────────┬────────┘       │
#                   │                │
#     ┌─────────────┼─────────────┐  │
#     ▼             ▼             ▼  │
# [web_search] [calculator] [file_reader]
#     │             │             │  │
#     └─────────────┼─────────────┘  │
#                   │                │
#          ┌────────▼────────┐       │
#          │    Observe      │───────┘
#          └────────┬────────┘
#                   │
#          ┌────────▼────────┐
#          │  Final Answer   │
#          └─────────────────┘

# Export workflow as Mermaid diagram
python scripts/agent_orchestrator.py agent.yaml --visualize --format mermaid
```

---

## Prompt Engineering Workflows

### Prompt Optimization Workflow

Use when improving an existing prompt's performance or reducing token costs.

**Step 1: Baseline current prompt**
```bash
python scripts/prompt_optimizer.py current_prompt.txt --analyze --output baseline.json
```

**Step 2: Identify issues**
Review the analysis report for:
- Token waste (redundant instructions, verbose examples)
- Ambiguous instructions (unclear output format, vague verbs)
- Missing constraints (no length limits, no format specification)

**Step 3: Apply optimization patterns**
| Issue | Pattern to Apply |
|-------|------------------|
| Ambiguous output | Add explicit format specification |
| Too verbose | Extract to few-shot examples |
| Inconsistent results | Add role/persona framing |
| Missing edge cases | Add constraint boundaries |

**Step 4: Generate optimized version**
```bash
python scripts/prompt_optimizer.py current_prompt.txt --optimize --output optimized.txt
```

**Step 5: Compare results**
```bash
python scripts/prompt_optimizer.py optimized.txt --analyze --compare baseline.json
# Shows: token reduction, clarity improvement, issues resolved
```

**Step 6: Validate with test cases**
Run both prompts against your evaluation set and compare outputs.

---

### Few-Shot Example Design Workflow

Use when creating examples for in-context learning.

**Step 1: Define the task clearly**
```
Task: Extract product entities from customer reviews
Input: Review text
Output: JSON with {product_name, sentiment, features_mentioned}
```

**Step 2: Select diverse examples (3-5 recommended)**
| Example Type | Purpose |
|--------------|---------|
| Simple case | Shows basic pattern |
| Edge case | Handles ambiguity |
| Complex case | Multiple entities |
| Negative case | What NOT to extract |

**Step 3: Format consistently**
```
Example 1:
Input: "Love my new iPhone 15, the camera is amazing!"
Output: {"product_name": "iPhone 15", "sentiment": "positive", "features_mentioned": ["camera"]}

Example 2:
Input: "The laptop was okay but battery life is terrible."
Output: {"product_name": "laptop", "sentiment": "mixed", "features_mentioned": ["battery life"]}
```

**Step 4: Validate example quality**
```bash
python scripts/prompt_optimizer.py prompt_with_examples.txt --validate-examples
# Checks: consistency, coverage, format alignment
```

**Step 5: Test with held-out cases**
Ensure model generalizes beyond your examples.

---

### Structured Output Design Workflow

Use when you need reliable JSON/XML/structured responses.

**Step 1: Define schema**
```json
{
  "type": "object",
  "properties": {
    "summary": {"type": "string", "maxLength": 200},
    "sentiment": {"enum": ["positive", "negative", "neutral"]},
    "confidence": {"type": "number", "minimum": 0, "maximum": 1}
  },
  "required": ["summary", "sentiment"]
}
```

**Step 2: Include schema in prompt**
```
Respond with JSON matching this schema:
- summary (string, max 200 chars): Brief summary of the content
- sentiment (enum): One of "positive", "negative", "neutral"
- confidence (number 0-1): Your confidence in the sentiment
```

**Step 3: Add format enforcement**
```
IMPORTANT: Respond ONLY with valid JSON. No markdown, no explanation.
Start your response with { and end with }
```

**Step 4: Validate outputs**
```bash
python scripts/prompt_optimizer.py structured_prompt.txt --validate-schema schema.json
```

---

## Reference Documentation

| File | Contains | Load when user asks about |
|------|----------|---------------------------|
| `references/prompt_engineering_patterns.md` | 10 prompt patterns with input/output examples | "which pattern?", "few-shot", "chain-of-thought", "role prompting" |
| `references/llm_evaluation_frameworks.md` | Evaluation metrics, scoring methods, A/B testing | "how to evaluate?", "measure quality", "compare prompts" |
| `references/agentic_system_design.md` | Agent architectures (ReAct, Plan-Execute, Tool Use) | "build agent", "tool calling", "multi-agent" |

---

## Common Patterns Quick Reference

| Pattern | When to Use | Example |
|---------|-------------|---------|
| **Zero-shot** | Simple, well-defined tasks | "Classify this email as spam or not spam" |
| **Few-shot** | Complex tasks, consistent format needed | Provide 3-5 examples before the task |
| **Chain-of-Thought** | Reasoning, math, multi-step logic | "Think step by step..." |
| **Role Prompting** | Expertise needed, specific perspective | "You are an expert tax accountant..." |
| **Structured Output** | Need parseable JSON/XML | Include schema + format enforcement |

---

## Common Commands

```bash
# Prompt Analysis
python scripts/prompt_optimizer.py prompt.txt --analyze          # Full analysis
python scripts/prompt_optimizer.py prompt.txt --tokens           # Token count only
python scripts/prompt_optimizer.py prompt.txt --optimize         # Generate optimized version

# RAG Evaluation
python scripts/rag_evaluator.py --contexts ctx.json --questions q.json  # Evaluate
python scripts/rag_evaluator.py --contexts ctx.json --compare baseline  # Compare to baseline

# Agent Development
python scripts/agent_orchestrator.py agent.yaml --validate       # Validate config
python scripts/agent_orchestrator.py agent.yaml --visualize      # Show workflow
python scripts/agent_orchestrator.py agent.yaml --estimate-cost  # Token estimation
```
