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Prompt Engineer Toolkit - Production Prompt Engineering

Tier: POWERFUL Category: Engineering Tags: prompt engineering, chain-of-thought, few-shot, evaluation, testing, prompt versioning

Overview

Prompt Engineer Toolkit provides the complete lifecycle for production prompts: design patterns that work, testing frameworks that catch regressions, versioning systems that track changes, and evaluation rubrics that replace subjective "looks good" with measurable quality. This is not about clever tricks -- it is about treating prompts as production code with the same rigor.

Core Prompt Patterns

1. System Prompt Architecture

Every production prompt has a layered structure. Order matters.

┌──────────────────────────────────────┐
│  Layer 1: Identity & Role            │  Who the model is
│  "You are a senior code reviewer..." │
├──────────────────────────────────────┤
│  Layer 2: Capabilities & Constraints │  What it can and cannot do
│  "You can read files, run tests..."  │
├──────────────────────────────────────┤
│  Layer 3: Output Format              │  How to structure responses
│  "Always respond with JSON..."       │
├──────────────────────────────────────┤
│  Layer 4: Quality Standards          │  What good output looks like
│  "Include edge cases, cite sources"  │
├──────────────────────────────────────┤
│  Layer 5: Anti-Patterns              │  What to avoid
│  "Never fabricate citations..."      │
├──────────────────────────────────────┤
│  Layer 6: Examples                   │  Calibration via demonstration
│  "Here is an example..."            │
└──────────────────────────────────────┘

Layer Design Principles

2. Chain-of-Thought (CoT) Patterns

Standard CoT

Think through this step by step:
1. First, identify [what needs to be analyzed]
2. Then, evaluate [specific criteria]
3. Finally, synthesize [the conclusion]

Show your reasoning for each step.

When to use: Complex reasoning, math, multi-step logic When NOT to use: Simple classification, formatting tasks, creative writing

Structured CoT with Scratchpad

Use the following reasoning process:

<scratchpad>
- List relevant facts
- Identify applicable rules
- Work through the logic
- Check for edge cases
</scratchpad>

Then provide your final answer outside the scratchpad tags.

Advantage: Model can reason messy, output is clean.

Self-Consistency CoT

Solve this problem three different ways, then compare your answers.
If all three agree, that's your answer.
If they disagree, identify which approach is most reliable and explain why.

When to use: High-stakes decisions where correctness matters more than speed. Cost: 3x token usage. Use selectively.

3. Few-Shot Design

Shot Selection Criteria

Few-Shot Template

Here are examples of the expected input and output:

Example 1 (simple case):
Input: [simple input]
Output: [simple output with annotation]

Example 2 (typical case):
Input: [typical input]
Output: [typical output with annotation]

Example 3 (edge case):
Input: [tricky input]
Output: [correct handling with annotation]

Now process this:
Input: {user_input}
Output:

Dynamic Few-Shot Selection

For production systems with thousands of examples:

1. Embed all examples
2. Embed the current input
3. Find K nearest examples by embedding similarity
4. Include those K examples as shots
5. Typical K: 3-5 (diminishing returns after 5)

4. Output Structuring Patterns

JSON Mode with Schema

Respond with a JSON object matching this exact schema:

{
  "analysis": {
    "summary": "string - one sentence summary",
    "severity": "string - one of: critical, high, medium, low",
    "findings": [
      {
        "issue": "string - description of the issue",
        "location": "string - file:line",
        "fix": "string - recommended fix",
        "confidence": "number - 0.0 to 1.0"
      }
    ],
    "overall_score": "number - 0 to 100"
  }
}

Rules:
- findings array must have at least one entry
- confidence must reflect actual certainty, not optimism
- overall_score: 90-100 (excellent), 70-89 (good), 50-69 (needs work), <50 (poor)

Structured Reasoning with Sections

Structure your response with these exact sections:

## Assessment
[1-2 sentence bottom line]

## Evidence
[Specific observations supporting the assessment]

## Risks
[What could go wrong, with likelihood estimates]

## Recommendation
[Specific actionable next steps with owners]

5. Prompt Decomposition

Complex prompts that try to do everything fail. Decompose them.

Single Responsibility Prompts

Pipeline Pattern

Prompt 1 (Extract):    Input → structured data
Prompt 2 (Analyze):    Structured data → findings
Prompt 3 (Synthesize): Findings → recommendation
Prompt 4 (Format):     Recommendation → user-facing output

Each prompt is testable independently. A failure in Prompt 2 doesn't require re-running Prompt 1.

6. Calibration Techniques

Temperature Guidelines

Confidence Calibration

For each finding, rate your confidence:

Confidence levels:
- VERIFIED: I can point to specific evidence in the provided context
- LIKELY: Strong inference from available information
- UNCERTAIN: Reasonable guess, but limited evidence
- SPECULATIVE: Possible but I'm reaching

Never state SPECULATIVE findings as VERIFIED.

Prompt Testing Framework

Test Case Design

Every production prompt needs a test suite.

Test Case Structure

{
  "test_id": "classify-urgent-001",
  "input": "Server is down, customers can't access the product",
  "expected": {
    "contains": ["critical", "immediate"],
    "not_contains": ["low priority", "can wait"],
    "format_regex": "^\\{.*\\}$",
    "max_tokens": 500,
    "required_fields": ["severity", "category"]
  },
  "tags": ["classification", "urgency", "happy-path"]
}

Test Suite Composition

Evaluation Rubric

Automated Scoring

Scoring Formula

score = (adherence * 0.30) + (accuracy * 0.30) + (safety * 0.20) + (format * 0.10) + (relevance * 0.10)

Pass threshold: 0.80
Warning threshold: 0.70
Fail threshold: < 0.70

Regression Testing Protocol

1. Before any prompt change:
   - Run full test suite against current prompt (baseline)
   - Record scores per test case

2. After prompt change:
   - Run same test suite against new prompt (candidate)
   - Compare scores per test case

3. Acceptance criteria:
   - Average score: candidate >= baseline
   - No individual test case drops by more than 10%
   - Zero safety violations (any safety failure = reject)
   - If criteria met: promote candidate
   - If criteria not met: iterate on prompt or reject

Prompt Versioning

Version Control Strategy

prompts/
├── support-classifier/
│   ├── v1.txt                 # Original version
│   ├── v2.txt                 # Added edge case handling
│   ├── v3.txt                 # Current production
│   ├── changelog.md           # Change log with rationale
│   └── tests/
│       ├── suite.json         # Test cases
│       └── baselines/
│           ├── v1-results.json
│           ├── v2-results.json
│           └── v3-results.json
├── code-reviewer/
│   ├── v1.txt
│   └── ...

Changelog Format

## v3 (2026-03-09)
**Author:** borghei
**Change:** Added explicit handling for multi-language inputs
**Reason:** v2 defaulted to English analysis for non-English code comments
**Test results:** Average score 0.87 (v2 was 0.82). No regressions.
**Rollback plan:** Revert to v2.txt

## v2 (2026-02-15)
**Author:** borghei
**Change:** Added structured output format with JSON schema
**Reason:** Downstream parser needed consistent format
**Test results:** Average score 0.82 (v1 was 0.79). Format compliance 100% (v1 was 73%).

Prompt Diff Analysis

Before deploying a new version, always diff:

Key questions for prompt diffs:
1. Were any constraints removed? (Risk: safety regression)
2. Were any examples changed? (Risk: calibration shift)
3. Was the output format changed? (Risk: downstream parser breaks)
4. Were any anti-patterns removed? (Risk: known failure modes return)
5. Is the new prompt longer? (Risk: context budget impact)

Common Prompt Failure Modes

Workflows

Workflow 1: Design a Production Prompt

1. Define the task precisely (input type, output type, quality criteria)
2. Write the system prompt using the 6-layer architecture
3. Create 10+ test cases (40% happy, 30% edge, 15% adversarial, 15% regression)
4. Run test suite, score results
5. Iterate until passing threshold (0.80+)
6. Version as v1, record baseline scores
7. Deploy with monitoring

Workflow 2: Debug a Degraded Prompt

1. Identify which test cases are failing
2. Categorize failures (format? accuracy? safety? relevance?)
3. Check: did the model change? (API version, model update)
4. Check: did the input distribution change? (new edge cases)
5. Check: was the prompt modified? (diff against last known good)
6. Fix the root cause (not the symptom)
7. Run full regression suite before deploying fix

Workflow 3: Migrate Prompt to New Model

1. Run full test suite on current model (baseline)
2. Run same suite on new model (no prompt changes)
3. Compare: if scores are equivalent, done
4. If scores drop: identify which dimensions degraded
5. Adjust prompt for new model's behavior patterns
6. Re-run suite until scores meet or exceed baseline
7. Document model-specific adjustments in changelog

Integration Points

References

• references/prompt-patterns-catalog.md - Complete catalog of prompting techniques with examples
• references/evaluation-rubric-templates.md - Reusable evaluation rubrics by task type
• references/model-specific-behaviors.md - Known behavior differences across model families

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